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home/xbodynamge/www/wp-admin/post.php000064400000021574151116567440013712 0ustar00<?php
/**
 * Edit post administration panel.
 *
 * Manage Post actions: post, edit, delete, etc.
 *
 * @package WordPress
 * @subpackage Administration
 */

/** WordPress Administration Bootstrap */
require_once( dirname( __FILE__ ) . '/admin.php' );

$parent_file = 'edit.php';
$submenu_file = 'edit.php';

wp_reset_vars( array( 'action' ) );

if ( isset( $_GET['post'] ) && isset( $_POST['post_ID'] ) && (int) $_GET['post'] !== (int) $_POST['post_ID'] )
	wp_die( __( 'A post ID mismatch has been detected.' ), __( 'Sorry, you are not allowed to edit this item.' ), 400 );
elseif ( isset( $_GET['post'] ) )
 	$post_id = $post_ID = (int) $_GET['post'];
elseif ( isset( $_POST['post_ID'] ) )
 	$post_id = $post_ID = (int) $_POST['post_ID'];
else
 	$post_id = $post_ID = 0;

/**
 * @global string  $post_type
 * @global object  $post_type_object
 * @global WP_Post $post
 */
global $post_type, $post_type_object, $post;

if ( $post_id )
	$post = get_post( $post_id );

if ( $post ) {
	$post_type = $post->post_type;
	$post_type_object = get_post_type_object( $post_type );
}

if ( isset( $_POST['post_type'] ) && $post && $post_type !== $_POST['post_type'] ) {
	wp_die( __( 'A post type mismatch has been detected.' ), __( 'Sorry, you are not allowed to edit this item.' ), 400 );
}

if ( isset( $_POST['deletepost'] ) )
	$action = 'delete';
elseif ( isset($_POST['wp-preview']) && 'dopreview' == $_POST['wp-preview'] )
	$action = 'preview';

$sendback = wp_get_referer();
if ( ! $sendback ||
     strpos( $sendback, 'post.php' ) !== false ||
     strpos( $sendback, 'post-new.php' ) !== false ) {
	if ( 'attachment' == $post_type ) {
		$sendback = admin_url( 'upload.php' );
	} else {
		$sendback = admin_url( 'edit.php' );
		if ( ! empty( $post_type ) ) {
			$sendback = add_query_arg( 'post_type', $post_type, $sendback );
		}
	}
} else {
	$sendback = remove_query_arg( array('trashed', 'untrashed', 'deleted', 'ids'), $sendback );
}

switch($action) {
case 'post-quickdraft-save':
	// Check nonce and capabilities
	$nonce = $_REQUEST['_wpnonce'];
	$error_msg = false;

	// For output of the quickdraft dashboard widget
	require_once ABSPATH . 'wp-admin/includes/dashboard.php';

	if ( ! wp_verify_nonce( $nonce, 'add-post' ) )
		$error_msg = __( 'Unable to submit this form, please refresh and try again.' );

	if ( ! current_user_can( get_post_type_object( 'post' )->cap->create_posts ) ) {
		exit;
	}

	if ( $error_msg )
		return wp_dashboard_quick_press( $error_msg );

	$post = get_post( $_REQUEST['post_ID'] );
	check_admin_referer( 'add-' . $post->post_type );

	$_POST['comment_status'] = get_default_comment_status( $post->post_type );
	$_POST['ping_status']    = get_default_comment_status( $post->post_type, 'pingback' );

	edit_post();
	wp_dashboard_quick_press();
	exit;

case 'postajaxpost':
case 'post':
	check_admin_referer( 'add-' . $post_type );
	$post_id = 'postajaxpost' == $action ? edit_post() : write_post();
	redirect_post( $post_id );
	exit();

case 'edit':
	$editing = true;

	if ( empty( $post_id ) ) {
		wp_redirect( admin_url('post.php') );
		exit();
	}

	if ( ! $post )
		wp_die( __( 'You attempted to edit an item that doesn&#8217;t exist. Perhaps it was deleted?' ) );

	if ( ! $post_type_object )
		wp_die( __( 'Invalid post type.' ) );

	if ( ! in_array( $typenow, get_post_types( array( 'show_ui' => true ) ) ) ) {
		wp_die( __( 'Sorry, you are not allowed to edit posts in this post type.' ) );
	}

	if ( ! current_user_can( 'edit_post', $post_id ) )
		wp_die( __( 'Sorry, you are not allowed to edit this item.' ) );

	if ( 'trash' == $post->post_status )
		wp_die( __( 'You can&#8217;t edit this item because it is in the Trash. Please restore it and try again.' ) );

	if ( ! empty( $_GET['get-post-lock'] ) ) {
		check_admin_referer( 'lock-post_' . $post_id );
		wp_set_post_lock( $post_id );
		wp_redirect( get_edit_post_link( $post_id, 'url' ) );
		exit();
	}

	$post_type = $post->post_type;
	if ( 'post' == $post_type ) {
		$parent_file = "edit.php";
		$submenu_file = "edit.php";
		$post_new_file = "post-new.php";
	} elseif ( 'attachment' == $post_type ) {
		$parent_file = 'upload.php';
		$submenu_file = 'upload.php';
		$post_new_file = 'media-new.php';
	} else {
		if ( isset( $post_type_object ) && $post_type_object->show_in_menu && $post_type_object->show_in_menu !== true )
			$parent_file = $post_type_object->show_in_menu;
		else
			$parent_file = "edit.php?post_type=$post_type";
		$submenu_file = "edit.php?post_type=$post_type";
		$post_new_file = "post-new.php?post_type=$post_type";
	}

	$title = $post_type_object->labels->edit_item;

	/**
	 * Allows replacement of the editor.
	 *
	 * @since 4.9.0
	 *
	 * @param boolean      Whether to replace the editor. Default false.
	 * @param object $post Post object.
	 */
	if ( apply_filters( 'replace_editor', false, $post ) === true ) {
		break;
	}

	if ( use_block_editor_for_post( $post ) ) {
		include( ABSPATH . 'wp-admin/edit-form-blocks.php' );
		break;
	}

	if ( ! wp_check_post_lock( $post->ID ) ) {
		$active_post_lock = wp_set_post_lock( $post->ID );

		if ( 'attachment' !== $post_type )
			wp_enqueue_script('autosave');
	}

	$post = get_post( $post_id, OBJECT, 'edit' );

	if ( post_type_supports($post_type, 'comments') ) {
		wp_enqueue_script('admin-comments');
		enqueue_comment_hotkeys_js();
	}

	include( ABSPATH . 'wp-admin/edit-form-advanced.php' );

	break;

case 'editattachment':
	check_admin_referer('update-post_' . $post_id);

	// Don't let these be changed
	unset($_POST['guid']);
	$_POST['post_type'] = 'attachment';

	// Update the thumbnail filename
	$newmeta = wp_get_attachment_metadata( $post_id, true );
	$newmeta['thumb'] = wp_basename( $_POST['thumb'] );

	wp_update_attachment_metadata( $post_id, $newmeta );

case 'editpost':
	check_admin_referer('update-post_' . $post_id);

	$post_id = edit_post();

	// Session cookie flag that the post was saved
	if ( isset( $_COOKIE['wp-saving-post'] ) && $_COOKIE['wp-saving-post'] === $post_id . '-check' ) {
		setcookie( 'wp-saving-post', $post_id . '-saved', time() + DAY_IN_SECONDS, ADMIN_COOKIE_PATH, COOKIE_DOMAIN, is_ssl() );
	}

	redirect_post($post_id); // Send user on their way while we keep working

	exit();

case 'trash':
	check_admin_referer('trash-post_' . $post_id);

	if ( ! $post )
		wp_die( __( 'The item you are trying to move to the Trash no longer exists.' ) );

	if ( ! $post_type_object )
		wp_die( __( 'Invalid post type.' ) );

	if ( ! current_user_can( 'delete_post', $post_id ) )
		wp_die( __( 'Sorry, you are not allowed to move this item to the Trash.' ) );

	if ( $user_id = wp_check_post_lock( $post_id ) ) {
		$user = get_userdata( $user_id );
		wp_die( sprintf( __( 'You cannot move this item to the Trash. %s is currently editing.' ), $user->display_name ) );
	}

	if ( ! wp_trash_post( $post_id ) )
		wp_die( __( 'Error in moving to Trash.' ) );

	wp_redirect( add_query_arg( array('trashed' => 1, 'ids' => $post_id), $sendback ) );
	exit();

case 'untrash':
	check_admin_referer('untrash-post_' . $post_id);

	if ( ! $post )
		wp_die( __( 'The item you are trying to restore from the Trash no longer exists.' ) );

	if ( ! $post_type_object )
		wp_die( __( 'Invalid post type.' ) );

	if ( ! current_user_can( 'delete_post', $post_id ) )
		wp_die( __( 'Sorry, you are not allowed to restore this item from the Trash.' ) );

	if ( ! wp_untrash_post( $post_id ) )
		wp_die( __( 'Error in restoring from Trash.' ) );

	wp_redirect( add_query_arg('untrashed', 1, $sendback) );
	exit();

case 'delete':
	check_admin_referer('delete-post_' . $post_id);

	if ( ! $post )
		wp_die( __( 'This item has already been deleted.' ) );

	if ( ! $post_type_object )
		wp_die( __( 'Invalid post type.' ) );

	if ( ! current_user_can( 'delete_post', $post_id ) )
		wp_die( __( 'Sorry, you are not allowed to delete this item.' ) );

	if ( $post->post_type == 'attachment' ) {
		$force = ( ! MEDIA_TRASH );
		if ( ! wp_delete_attachment( $post_id, $force ) )
			wp_die( __( 'Error in deleting.' ) );
	} else {
		if ( ! wp_delete_post( $post_id, true ) )
			wp_die( __( 'Error in deleting.' ) );
	}

	wp_redirect( add_query_arg('deleted', 1, $sendback) );
	exit();

case 'preview':
	check_admin_referer( 'update-post_' . $post_id );

	$url = post_preview();

	wp_redirect($url);
	exit();

case 'toggle-custom-fields':
	check_admin_referer( 'toggle-custom-fields' );

	$current_user_id = get_current_user_id();
	if ( $current_user_id ) {
		$enable_custom_fields = (bool) get_user_meta( $current_user_id, 'enable_custom_fields', true );
		update_user_meta( $current_user_id, 'enable_custom_fields', ! $enable_custom_fields );
	}

	wp_safe_redirect( wp_get_referer() );
	exit();

default:
	/**
	 * Fires for a given custom post action request.
	 *
	 * The dynamic portion of the hook name, `$action`, refers to the custom post action.
	 *
	 * @since 4.6.0
	 *
	 * @param int $post_id Post ID sent with the request.
	 */
	do_action( "post_action_{$action}", $post_id );

	wp_redirect( admin_url('edit.php') );
	exit();
} // end switch
include( ABSPATH . 'wp-admin/admin-footer.php' );
home/xbodynamge/dev/wp-admin/post.php000060400000021571151117122630013622 0ustar00<?php
/**
 * Edit post administration panel.
 *
 * Manage Post actions: post, edit, delete, etc.
 *
 * @package WordPress
 * @subpackage Administration
 */

/** WordPress Administration Bootstrap */
require_once( dirname( __FILE__ ) . '/admin.php' );

$parent_file = 'edit.php';
$submenu_file = 'edit.php';

wp_reset_vars( array( 'action' ) );

if ( isset( $_GET['post'] ) && isset( $_POST['post_ID'] ) && (int) $_GET['post'] !== (int) $_POST['post_ID'] )
	wp_die( __( 'A post ID mismatch has been detected.' ), __( 'Sorry, you are not allowed to edit this item.' ), 400 );
elseif ( isset( $_GET['post'] ) )
 	$post_id = $post_ID = (int) $_GET['post'];
elseif ( isset( $_POST['post_ID'] ) )
 	$post_id = $post_ID = (int) $_POST['post_ID'];
else
 	$post_id = $post_ID = 0;

/**
 * @global string  $post_type
 * @global object  $post_type_object
 * @global WP_Post $post
 */
global $post_type, $post_type_object, $post;

if ( $post_id )
	$post = get_post( $post_id );

if ( $post ) {
	$post_type = $post->post_type;
	$post_type_object = get_post_type_object( $post_type );
}

if ( isset( $_POST['post_type'] ) && $post && $post_type !== $_POST['post_type'] ) {
	wp_die( __( 'A post type mismatch has been detected.' ), __( 'Sorry, you are not allowed to edit this item.' ), 400 );
}

if ( isset( $_POST['deletepost'] ) )
	$action = 'delete';
elseif ( isset($_POST['wp-preview']) && 'dopreview' == $_POST['wp-preview'] )
	$action = 'preview';

$sendback = wp_get_referer();
if ( ! $sendback ||
     strpos( $sendback, 'post.php' ) !== false ||
     strpos( $sendback, 'post-new.php' ) !== false ) {
	if ( 'attachment' == $post_type ) {
		$sendback = admin_url( 'upload.php' );
	} else {
		$sendback = admin_url( 'edit.php' );
		if ( ! empty( $post_type ) ) {
			$sendback = add_query_arg( 'post_type', $post_type, $sendback );
		}
	}
} else {
	$sendback = remove_query_arg( array('trashed', 'untrashed', 'deleted', 'ids'), $sendback );
}

switch($action) {
case 'post-quickdraft-save':
	// Check nonce and capabilities
	$nonce = $_REQUEST['_wpnonce'];
	$error_msg = false;

	// For output of the quickdraft dashboard widget
	require_once ABSPATH . 'wp-admin/includes/dashboard.php';

	if ( ! wp_verify_nonce( $nonce, 'add-post' ) )
		$error_msg = __( 'Unable to submit this form, please refresh and try again.' );

	if ( ! current_user_can( get_post_type_object( 'post' )->cap->create_posts ) ) {
		exit;
	}

	if ( $error_msg )
		return wp_dashboard_quick_press( $error_msg );

	$post = get_post( $_REQUEST['post_ID'] );
	check_admin_referer( 'add-' . $post->post_type );

	$_POST['comment_status'] = get_default_comment_status( $post->post_type );
	$_POST['ping_status']    = get_default_comment_status( $post->post_type, 'pingback' );

	edit_post();
	wp_dashboard_quick_press();
	exit;

case 'postajaxpost':
case 'post':
	check_admin_referer( 'add-' . $post_type );
	$post_id = 'postajaxpost' == $action ? edit_post() : write_post();
	redirect_post( $post_id );
	exit();

case 'edit':
	$editing = true;

	if ( empty( $post_id ) ) {
		wp_redirect( admin_url('post.php') );
		exit();
	}

	if ( ! $post )
		wp_die( __( 'You attempted to edit an item that doesn&#8217;t exist. Perhaps it was deleted?' ) );

	if ( ! $post_type_object )
		wp_die( __( 'Invalid post type.' ) );

	if ( ! in_array( $typenow, get_post_types( array( 'show_ui' => true ) ) ) ) {
		wp_die( __( 'Sorry, you are not allowed to edit posts in this post type.' ) );
	}

	if ( ! current_user_can( 'edit_post', $post_id ) )
		wp_die( __( 'Sorry, you are not allowed to edit this item.' ) );

	if ( 'trash' == $post->post_status )
		wp_die( __( 'You can&#8217;t edit this item because it is in the Trash. Please restore it and try again.' ) );

	if ( ! empty( $_GET['get-post-lock'] ) ) {
		check_admin_referer( 'lock-post_' . $post_id );
		wp_set_post_lock( $post_id );
		wp_redirect( get_edit_post_link( $post_id, 'url' ) );
		exit();
	}

	$post_type = $post->post_type;
	if ( 'post' == $post_type ) {
		$parent_file = "edit.php";
		$submenu_file = "edit.php";
		$post_new_file = "post-new.php";
	} elseif ( 'attachment' == $post_type ) {
		$parent_file = 'upload.php';
		$submenu_file = 'upload.php';
		$post_new_file = 'media-new.php';
	} else {
		if ( isset( $post_type_object ) && $post_type_object->show_in_menu && $post_type_object->show_in_menu !== true )
			$parent_file = $post_type_object->show_in_menu;
		else
			$parent_file = "edit.php?post_type=$post_type";
		$submenu_file = "edit.php?post_type=$post_type";
		$post_new_file = "post-new.php?post_type=$post_type";
	}

	/**
	 * Allows replacement of the editor.
	 *
	 * @since 4.9.0
	 *
	 * @param boolean      Whether to replace the editor. Default false.
	 * @param object $post Post object.
	 */
	if ( apply_filters( 'replace_editor', false, $post ) === true ) {
		break;
	}

	if ( use_block_editor_for_post( $post ) ) {
		include( ABSPATH . 'wp-admin/edit-form-blocks.php' );
		break;
	}

	if ( ! wp_check_post_lock( $post->ID ) ) {
		$active_post_lock = wp_set_post_lock( $post->ID );

		if ( 'attachment' !== $post_type )
			wp_enqueue_script('autosave');
	}

	$title = $post_type_object->labels->edit_item;
	$post = get_post($post_id, OBJECT, 'edit');

	if ( post_type_supports($post_type, 'comments') ) {
		wp_enqueue_script('admin-comments');
		enqueue_comment_hotkeys_js();
	}

	include( ABSPATH . 'wp-admin/edit-form-advanced.php' );

	break;

case 'editattachment':
	check_admin_referer('update-post_' . $post_id);

	// Don't let these be changed
	unset($_POST['guid']);
	$_POST['post_type'] = 'attachment';

	// Update the thumbnail filename
	$newmeta = wp_get_attachment_metadata( $post_id, true );
	$newmeta['thumb'] = wp_basename( $_POST['thumb'] );

	wp_update_attachment_metadata( $post_id, $newmeta );

case 'editpost':
	check_admin_referer('update-post_' . $post_id);

	$post_id = edit_post();

	// Session cookie flag that the post was saved
	if ( isset( $_COOKIE['wp-saving-post'] ) && $_COOKIE['wp-saving-post'] === $post_id . '-check' ) {
		setcookie( 'wp-saving-post', $post_id . '-saved', time() + DAY_IN_SECONDS, ADMIN_COOKIE_PATH, COOKIE_DOMAIN, is_ssl() );
	}

	redirect_post($post_id); // Send user on their way while we keep working

	exit();

case 'trash':
	check_admin_referer('trash-post_' . $post_id);

	if ( ! $post )
		wp_die( __( 'The item you are trying to move to the Trash no longer exists.' ) );

	if ( ! $post_type_object )
		wp_die( __( 'Invalid post type.' ) );

	if ( ! current_user_can( 'delete_post', $post_id ) )
		wp_die( __( 'Sorry, you are not allowed to move this item to the Trash.' ) );

	if ( $user_id = wp_check_post_lock( $post_id ) ) {
		$user = get_userdata( $user_id );
		wp_die( sprintf( __( 'You cannot move this item to the Trash. %s is currently editing.' ), $user->display_name ) );
	}

	if ( ! wp_trash_post( $post_id ) )
		wp_die( __( 'Error in moving to Trash.' ) );

	wp_redirect( add_query_arg( array('trashed' => 1, 'ids' => $post_id), $sendback ) );
	exit();

case 'untrash':
	check_admin_referer('untrash-post_' . $post_id);

	if ( ! $post )
		wp_die( __( 'The item you are trying to restore from the Trash no longer exists.' ) );

	if ( ! $post_type_object )
		wp_die( __( 'Invalid post type.' ) );

	if ( ! current_user_can( 'delete_post', $post_id ) )
		wp_die( __( 'Sorry, you are not allowed to restore this item from the Trash.' ) );

	if ( ! wp_untrash_post( $post_id ) )
		wp_die( __( 'Error in restoring from Trash.' ) );

	wp_redirect( add_query_arg('untrashed', 1, $sendback) );
	exit();

case 'delete':
	check_admin_referer('delete-post_' . $post_id);

	if ( ! $post )
		wp_die( __( 'This item has already been deleted.' ) );

	if ( ! $post_type_object )
		wp_die( __( 'Invalid post type.' ) );

	if ( ! current_user_can( 'delete_post', $post_id ) )
		wp_die( __( 'Sorry, you are not allowed to delete this item.' ) );

	if ( $post->post_type == 'attachment' ) {
		$force = ( ! MEDIA_TRASH );
		if ( ! wp_delete_attachment( $post_id, $force ) )
			wp_die( __( 'Error in deleting.' ) );
	} else {
		if ( ! wp_delete_post( $post_id, true ) )
			wp_die( __( 'Error in deleting.' ) );
	}

	wp_redirect( add_query_arg('deleted', 1, $sendback) );
	exit();

case 'preview':
	check_admin_referer( 'update-post_' . $post_id );

	$url = post_preview();

	wp_redirect($url);
	exit();

case 'toggle-custom-fields':
	check_admin_referer( 'toggle-custom-fields' );

	$current_user_id = get_current_user_id();
	if ( $current_user_id ) {
		$enable_custom_fields = (bool) get_user_meta( $current_user_id, 'enable_custom_fields', true );
		update_user_meta( $current_user_id, 'enable_custom_fields', ! $enable_custom_fields );
	}

	wp_safe_redirect( wp_get_referer() );
	exit();

default:
	/**
	 * Fires for a given custom post action request.
	 *
	 * The dynamic portion of the hook name, `$action`, refers to the custom post action.
	 *
	 * @since 4.6.0
	 *
	 * @param int $post_id Post ID sent with the request.
	 */
	do_action( "post_action_{$action}", $post_id );

	wp_redirect( admin_url('edit.php') );
	exit();
} // end switch
include( ABSPATH . 'wp-admin/admin-footer.php' );
home/xbodynamge/dev/wp-includes/post.php000060400000666431151117541150014354 0ustar00<?php
/**
 * Core Post API
 *
 * @package WordPress
 * @subpackage Post
 */

//
// Post Type Registration
//

/**
 * Creates the initial post types when 'init' action is fired.
 *
 * See {@see 'init'}.
 *
 * @since 2.9.0
 */
function create_initial_post_types() {
	register_post_type( 'post', array(
		'labels' => array(
			'name_admin_bar' => _x( 'Post', 'add new from admin bar' ),
		),
		'public'  => true,
		'_builtin' => true, /* internal use only. don't use this when registering your own post type. */
		'_edit_link' => 'post.php?post=%d', /* internal use only. don't use this when registering your own post type. */
		'capability_type' => 'post',
		'map_meta_cap' => true,
		'menu_position' => 5,
		'hierarchical' => false,
		'rewrite' => false,
		'query_var' => false,
		'delete_with_user' => true,
		'supports' => array( 'title', 'editor', 'author', 'thumbnail', 'excerpt', 'trackbacks', 'custom-fields', 'comments', 'revisions', 'post-formats' ),
		'show_in_rest' => true,
		'rest_base' => 'posts',
		'rest_controller_class' => 'WP_REST_Posts_Controller',
	) );

	register_post_type( 'page', array(
		'labels' => array(
			'name_admin_bar' => _x( 'Page', 'add new from admin bar' ),
		),
		'public' => true,
		'publicly_queryable' => false,
		'_builtin' => true, /* internal use only. don't use this when registering your own post type. */
		'_edit_link' => 'post.php?post=%d', /* internal use only. don't use this when registering your own post type. */
		'capability_type' => 'page',
		'map_meta_cap' => true,
		'menu_position' => 20,
		'hierarchical' => true,
		'rewrite' => false,
		'query_var' => false,
		'delete_with_user' => true,
		'supports' => array( 'title', 'editor', 'author', 'thumbnail', 'page-attributes', 'custom-fields', 'comments', 'revisions' ),
		'show_in_rest' => true,
		'rest_base' => 'pages',
		'rest_controller_class' => 'WP_REST_Posts_Controller',
	) );

	register_post_type( 'attachment', array(
		'labels' => array(
			'name' => _x('Media', 'post type general name'),
			'name_admin_bar' => _x( 'Media', 'add new from admin bar' ),
			'add_new' => _x( 'Add New', 'add new media' ),
 			'edit_item' => __( 'Edit Media' ),
 			'view_item' => __( 'View Attachment Page' ),
			'attributes' => __( 'Attachment Attributes' ),
		),
		'public' => true,
		'show_ui' => true,
		'_builtin' => true, /* internal use only. don't use this when registering your own post type. */
		'_edit_link' => 'post.php?post=%d', /* internal use only. don't use this when registering your own post type. */
		'capability_type' => 'post',
		'capabilities' => array(
			'create_posts' => 'upload_files',
		),
		'map_meta_cap' => true,
		'hierarchical' => false,
		'rewrite' => false,
		'query_var' => false,
		'show_in_nav_menus' => false,
		'delete_with_user' => true,
		'supports' => array( 'title', 'author', 'comments' ),
		'show_in_rest' => true,
		'rest_base' => 'media',
		'rest_controller_class' => 'WP_REST_Attachments_Controller',
	) );
	add_post_type_support( 'attachment:audio', 'thumbnail' );
	add_post_type_support( 'attachment:video', 'thumbnail' );

	register_post_type( 'revision', array(
		'labels' => array(
			'name' => __( 'Revisions' ),
			'singular_name' => __( 'Revision' ),
		),
		'public' => false,
		'_builtin' => true, /* internal use only. don't use this when registering your own post type. */
		'_edit_link' => 'revision.php?revision=%d', /* internal use only. don't use this when registering your own post type. */
		'capability_type' => 'post',
		'map_meta_cap' => true,
		'hierarchical' => false,
		'rewrite' => false,
		'query_var' => false,
		'can_export' => false,
		'delete_with_user' => true,
		'supports' => array( 'author' ),
	) );

	register_post_type( 'nav_menu_item', array(
		'labels' => array(
			'name' => __( 'Navigation Menu Items' ),
			'singular_name' => __( 'Navigation Menu Item' ),
		),
		'public' => false,
		'_builtin' => true, /* internal use only. don't use this when registering your own post type. */
		'hierarchical' => false,
		'rewrite' => false,
		'delete_with_user' => false,
		'query_var' => false,
	) );

	register_post_type( 'custom_css', array(
		'labels' => array(
			'name'          => __( 'Custom CSS' ),
			'singular_name' => __( 'Custom CSS' ),
		),
		'public'           => false,
		'hierarchical'     => false,
		'rewrite'          => false,
		'query_var'        => false,
		'delete_with_user' => false,
		'can_export'       => true,
		'_builtin'         => true, /* internal use only. don't use this when registering your own post type. */
		'supports'         => array( 'title', 'revisions' ),
		'capabilities'     => array(
			'delete_posts'           => 'edit_theme_options',
			'delete_post'            => 'edit_theme_options',
			'delete_published_posts' => 'edit_theme_options',
			'delete_private_posts'   => 'edit_theme_options',
			'delete_others_posts'    => 'edit_theme_options',
			'edit_post'              => 'edit_css',
			'edit_posts'             => 'edit_css',
			'edit_others_posts'      => 'edit_css',
			'edit_published_posts'   => 'edit_css',
			'read_post'              => 'read',
			'read_private_posts'     => 'read',
			'publish_posts'          => 'edit_theme_options',
		),
	) );

	register_post_type( 'customize_changeset', array(
		'labels' => array(
			'name'               => _x( 'Changesets', 'post type general name' ),
			'singular_name'      => _x( 'Changeset', 'post type singular name' ),
			'menu_name'          => _x( 'Changesets', 'admin menu' ),
			'name_admin_bar'     => _x( 'Changeset', 'add new on admin bar' ),
			'add_new'            => _x( 'Add New', 'Customize Changeset' ),
			'add_new_item'       => __( 'Add New Changeset' ),
			'new_item'           => __( 'New Changeset' ),
			'edit_item'          => __( 'Edit Changeset' ),
			'view_item'          => __( 'View Changeset' ),
			'all_items'          => __( 'All Changesets' ),
			'search_items'       => __( 'Search Changesets' ),
			'not_found'          => __( 'No changesets found.' ),
			'not_found_in_trash' => __( 'No changesets found in Trash.' ),
		),
		'public' => false,
		'_builtin' => true, /* internal use only. don't use this when registering your own post type. */
		'map_meta_cap' => true,
		'hierarchical' => false,
		'rewrite' => false,
		'query_var' => false,
		'can_export' => false,
		'delete_with_user' => false,
		'supports' => array( 'title', 'author' ),
		'capability_type' => 'customize_changeset',
		'capabilities' => array(
			'create_posts' => 'customize',
			'delete_others_posts' => 'customize',
			'delete_post' => 'customize',
			'delete_posts' => 'customize',
			'delete_private_posts' => 'customize',
			'delete_published_posts' => 'customize',
			'edit_others_posts' => 'customize',
			'edit_post' => 'customize',
			'edit_posts' => 'customize',
			'edit_private_posts' => 'customize',
			'edit_published_posts' => 'do_not_allow',
			'publish_posts' => 'customize',
			'read' => 'read',
			'read_post' => 'customize',
			'read_private_posts' => 'customize',
		),
	) );

	register_post_type( 'oembed_cache', array(
		'labels' => array(
			'name'          => __( 'oEmbed Responses' ),
			'singular_name' => __( 'oEmbed Response' ),
		),
		'public'           => false,
		'hierarchical'     => false,
		'rewrite'          => false,
		'query_var'        => false,
		'delete_with_user' => false,
		'can_export'       => false,
		'_builtin'         => true, /* internal use only. don't use this when registering your own post type. */
		'supports'         => array(),
	) );

	register_post_type( 'user_request', array(
		'labels'           => array(
			'name'          => __( 'User Requests' ),
			'singular_name' => __( 'User Request' ),
		),
		'public'           => false,
		'_builtin'         => true, /* internal use only. don't use this when registering your own post type. */
		'hierarchical'     => false,
		'rewrite'          => false,
		'query_var'        => false,
		'can_export'       => false,
		'delete_with_user' => false,
		'supports'         => array(),
	) );

	register_post_type(
		'wp_block',
		array(
			'labels'                => array(
				'name'                     => _x( 'Blocks', 'post type general name' ),
				'singular_name'            => _x( 'Block', 'post type singular name' ),
				'menu_name'                => _x( 'Blocks', 'admin menu' ),
				'name_admin_bar'           => _x( 'Block', 'add new on admin bar' ),
				'add_new'                  => _x( 'Add New', 'Block' ),
				'add_new_item'             => __( 'Add New Block' ),
				'new_item'                 => __( 'New Block' ),
				'edit_item'                => __( 'Edit Block' ),
				'view_item'                => __( 'View Block' ),
				'all_items'                => __( 'All Blocks' ),
				'search_items'             => __( 'Search Blocks' ),
				'not_found'                => __( 'No blocks found.' ),
				'not_found_in_trash'       => __( 'No blocks found in Trash.' ),
				'filter_items_list'        => __( 'Filter blocks list' ),
				'items_list_navigation'    => __( 'Blocks list navigation' ),
				'items_list'               => __( 'Blocks list' ),
				'item_published'           => __( 'Block published.' ),
				'item_published_privately' => __( 'Block published privately.' ),
				'item_reverted_to_draft'   => __( 'Block reverted to draft.' ),
				'item_scheduled'           => __( 'Block scheduled.' ),
				'item_updated'             => __( 'Block updated.' ),
			),
			'public'                => false,
			'_builtin'              => true, /* internal use only. don't use this when registering your own post type. */
			'show_ui'               => true,
			'show_in_menu'          => false,
			'rewrite'               => false,
			'show_in_rest'          => true,
			'rest_base'             => 'blocks',
			'rest_controller_class' => 'WP_REST_Blocks_Controller',
			'capability_type'       => 'block',
			'capabilities'          => array(
				// You need to be able to edit posts, in order to read blocks in their raw form.
				'read'                   => 'edit_posts',
				// You need to be able to publish posts, in order to create blocks.
				'create_posts'           => 'publish_posts',
				'edit_published_posts'   => 'edit_published_posts',
				'delete_published_posts' => 'delete_published_posts',
				'edit_others_posts'      => 'edit_others_posts',
				'delete_others_posts'    => 'delete_others_posts',
			),
			'map_meta_cap'          => true,
			'supports'              => array(
				'title',
				'editor',
			),
		)
	);


	register_post_status( 'publish', array(
		'label'       => _x( 'Published', 'post status' ),
		'public'      => true,
		'_builtin'    => true, /* internal use only. */
		'label_count' => _n_noop( 'Published <span class="count">(%s)</span>', 'Published <span class="count">(%s)</span>' ),
	) );

	register_post_status( 'future', array(
		'label'       => _x( 'Scheduled', 'post status' ),
		'protected'   => true,
		'_builtin'    => true, /* internal use only. */
		'label_count' => _n_noop('Scheduled <span class="count">(%s)</span>', 'Scheduled <span class="count">(%s)</span>' ),
	) );

	register_post_status( 'draft', array(
		'label'       => _x( 'Draft', 'post status' ),
		'protected'   => true,
		'_builtin'    => true, /* internal use only. */
		'label_count' => _n_noop( 'Draft <span class="count">(%s)</span>', 'Drafts <span class="count">(%s)</span>' ),
	) );

	register_post_status( 'pending', array(
		'label'       => _x( 'Pending', 'post status' ),
		'protected'   => true,
		'_builtin'    => true, /* internal use only. */
		'label_count' => _n_noop( 'Pending <span class="count">(%s)</span>', 'Pending <span class="count">(%s)</span>' ),
	) );

	register_post_status( 'private', array(
		'label'       => _x( 'Private', 'post status' ),
		'private'     => true,
		'_builtin'    => true, /* internal use only. */
		'label_count' => _n_noop( 'Private <span class="count">(%s)</span>', 'Private <span class="count">(%s)</span>' ),
	) );

	register_post_status( 'trash', array(
		'label'       => _x( 'Trash', 'post status' ),
		'internal'    => true,
		'_builtin'    => true, /* internal use only. */
		'label_count' => _n_noop( 'Trash <span class="count">(%s)</span>', 'Trash <span class="count">(%s)</span>' ),
		'show_in_admin_status_list' => true,
	) );

	register_post_status( 'auto-draft', array(
		'label'    => 'auto-draft',
		'internal' => true,
		'_builtin' => true, /* internal use only. */
	) );

	register_post_status( 'inherit', array(
		'label'    => 'inherit',
		'internal' => true,
		'_builtin' => true, /* internal use only. */
		'exclude_from_search' => false,
	) );

	register_post_status( 'request-pending', array(
		'label'               => _x( 'Pending', 'request status' ),
		'internal'            => true,
		'_builtin'            => true, /* internal use only. */
		'exclude_from_search' => false,
	) );

	register_post_status( 'request-confirmed', array(
		'label'               => _x( 'Confirmed', 'request status' ),
		'internal'            => true,
		'_builtin'            => true, /* internal use only. */
		'exclude_from_search' => false,
	) );

	register_post_status( 'request-failed', array(
		'label'               => _x( 'Failed', 'request status' ),
		'internal'            => true,
		'_builtin'            => true, /* internal use only. */
		'exclude_from_search' => false,
	) );

	register_post_status( 'request-completed', array(
		'label'               => _x( 'Completed', 'request status' ),
		'internal'            => true,
		'_builtin'            => true, /* internal use only. */
		'exclude_from_search' => false,
	) );
}

/**
 * Retrieve attached file path based on attachment ID.
 *
 * By default the path will go through the 'get_attached_file' filter, but
 * passing a true to the $unfiltered argument of get_attached_file() will
 * return the file path unfiltered.
 *
 * The function works by getting the single post meta name, named
 * '_wp_attached_file' and returning it. This is a convenience function to
 * prevent looking up the meta name and provide a mechanism for sending the
 * attached filename through a filter.
 *
 * @since 2.0.0
 *
 * @param int  $attachment_id Attachment ID.
 * @param bool $unfiltered    Optional. Whether to apply filters. Default false.
 * @return string|false The file path to where the attached file should be, false otherwise.
 */
function get_attached_file( $attachment_id, $unfiltered = false ) {
	$file = get_post_meta( $attachment_id, '_wp_attached_file', true );

	// If the file is relative, prepend upload dir.
	if ( $file && 0 !== strpos( $file, '/' ) && ! preg_match( '|^.:\\\|', $file ) && ( ( $uploads = wp_get_upload_dir() ) && false === $uploads['error'] ) ) {
		$file = $uploads['basedir'] . "/$file";
	}

	if ( $unfiltered ) {
		return $file;
	}

	/**
	 * Filters the attached file based on the given ID.
	 *
	 * @since 2.1.0
	 *
	 * @param string $file          Path to attached file.
	 * @param int    $attachment_id Attachment ID.
	 */
	return apply_filters( 'get_attached_file', $file, $attachment_id );
}

/**
 * Update attachment file path based on attachment ID.
 *
 * Used to update the file path of the attachment, which uses post meta name
 * '_wp_attached_file' to store the path of the attachment.
 *
 * @since 2.1.0
 *
 * @param int    $attachment_id Attachment ID.
 * @param string $file          File path for the attachment.
 * @return bool True on success, false on failure.
 */
function update_attached_file( $attachment_id, $file ) {
	if ( !get_post( $attachment_id ) )
		return false;

	/**
	 * Filters the path to the attached file to update.
	 *
	 * @since 2.1.0
	 *
	 * @param string $file          Path to the attached file to update.
	 * @param int    $attachment_id Attachment ID.
	 */
	$file = apply_filters( 'update_attached_file', $file, $attachment_id );

	if ( $file = _wp_relative_upload_path( $file ) )
		return update_post_meta( $attachment_id, '_wp_attached_file', $file );
	else
		return delete_post_meta( $attachment_id, '_wp_attached_file' );
}

/**
 * Return relative path to an uploaded file.
 *
 * The path is relative to the current upload dir.
 *
 * @since 2.9.0
 *
 * @param string $path Full path to the file.
 * @return string Relative path on success, unchanged path on failure.
 */
function _wp_relative_upload_path( $path ) {
	$new_path = $path;

	$uploads = wp_get_upload_dir();
	if ( 0 === strpos( $new_path, $uploads['basedir'] ) ) {
			$new_path = str_replace( $uploads['basedir'], '', $new_path );
			$new_path = ltrim( $new_path, '/' );
	}

	/**
	 * Filters the relative path to an uploaded file.
	 *
	 * @since 2.9.0
	 *
	 * @param string $new_path Relative path to the file.
	 * @param string $path     Full path to the file.
	 */
	return apply_filters( '_wp_relative_upload_path', $new_path, $path );
}

/**
 * Retrieve all children of the post parent ID.
 *
 * Normally, without any enhancements, the children would apply to pages. In the
 * context of the inner workings of WordPress, pages, posts, and attachments
 * share the same table, so therefore the functionality could apply to any one
 * of them. It is then noted that while this function does not work on posts, it
 * does not mean that it won't work on posts. It is recommended that you know
 * what context you wish to retrieve the children of.
 *
 * Attachments may also be made the child of a post, so if that is an accurate
 * statement (which needs to be verified), it would then be possible to get
 * all of the attachments for a post. Attachments have since changed since
 * version 2.5, so this is most likely inaccurate, but serves generally as an
 * example of what is possible.
 *
 * The arguments listed as defaults are for this function and also of the
 * get_posts() function. The arguments are combined with the get_children defaults
 * and are then passed to the get_posts() function, which accepts additional arguments.
 * You can replace the defaults in this function, listed below and the additional
 * arguments listed in the get_posts() function.
 *
 * The 'post_parent' is the most important argument and important attention
 * needs to be paid to the $args parameter. If you pass either an object or an
 * integer (number), then just the 'post_parent' is grabbed and everything else
 * is lost. If you don't specify any arguments, then it is assumed that you are
 * in The Loop and the post parent will be grabbed for from the current post.
 *
 * The 'post_parent' argument is the ID to get the children. The 'numberposts'
 * is the amount of posts to retrieve that has a default of '-1', which is
 * used to get all of the posts. Giving a number higher than 0 will only
 * retrieve that amount of posts.
 *
 * The 'post_type' and 'post_status' arguments can be used to choose what
 * criteria of posts to retrieve. The 'post_type' can be anything, but WordPress
 * post types are 'post', 'pages', and 'attachments'. The 'post_status'
 * argument will accept any post status within the write administration panels.
 *
 * @since 2.0.0
 *
 * @see get_posts()
 * @todo Check validity of description.
 *
 * @global WP_Post $post
 *
 * @param mixed  $args   Optional. User defined arguments for replacing the defaults. Default empty.
 * @param string $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
 *                       a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
 * @return array Array of children, where the type of each element is determined by $output parameter.
 *               Empty array on failure.
 */
function get_children( $args = '', $output = OBJECT ) {
	$kids = array();
	if ( empty( $args ) ) {
		if ( isset( $GLOBALS['post'] ) ) {
			$args = array('post_parent' => (int) $GLOBALS['post']->post_parent );
		} else {
			return $kids;
		}
	} elseif ( is_object( $args ) ) {
		$args = array('post_parent' => (int) $args->post_parent );
	} elseif ( is_numeric( $args ) ) {
		$args = array('post_parent' => (int) $args);
	}

	$defaults = array(
		'numberposts' => -1, 'post_type' => 'any',
		'post_status' => 'any', 'post_parent' => 0,
	);

	$r = wp_parse_args( $args, $defaults );

	$children = get_posts( $r );

	if ( ! $children )
		return $kids;

	if ( ! empty( $r['fields'] ) )
		return $children;

	update_post_cache($children);

	foreach ( $children as $key => $child )
		$kids[$child->ID] = $children[$key];

	if ( $output == OBJECT ) {
		return $kids;
	} elseif ( $output == ARRAY_A ) {
		$weeuns = array();
		foreach ( (array) $kids as $kid ) {
			$weeuns[$kid->ID] = get_object_vars($kids[$kid->ID]);
		}
		return $weeuns;
	} elseif ( $output == ARRAY_N ) {
		$babes = array();
		foreach ( (array) $kids as $kid ) {
			$babes[$kid->ID] = array_values(get_object_vars($kids[$kid->ID]));
		}
		return $babes;
	} else {
		return $kids;
	}
}

/**
 * Get extended entry info (<!--more-->).
 *
 * There should not be any space after the second dash and before the word
 * 'more'. There can be text or space(s) after the word 'more', but won't be
 * referenced.
 *
 * The returned array has 'main', 'extended', and 'more_text' keys. Main has the text before
 * the `<!--more-->`. The 'extended' key has the content after the
 * `<!--more-->` comment. The 'more_text' key has the custom "Read More" text.
 *
 * @since 1.0.0
 *
 * @param string $post Post content.
 * @return array Post before ('main'), after ('extended'), and custom read more ('more_text').
 */
function get_extended( $post ) {
	//Match the new style more links.
	if ( preg_match('/<!--more(.*?)?-->/', $post, $matches) ) {
		list($main, $extended) = explode($matches[0], $post, 2);
		$more_text = $matches[1];
	} else {
		$main = $post;
		$extended = '';
		$more_text = '';
	}

	//  leading and trailing whitespace.
	$main = preg_replace('/^[\s]*(.*)[\s]*$/', '\\1', $main);
	$extended = preg_replace('/^[\s]*(.*)[\s]*$/', '\\1', $extended);
	$more_text = preg_replace('/^[\s]*(.*)[\s]*$/', '\\1', $more_text);

	return array( 'main' => $main, 'extended' => $extended, 'more_text' => $more_text );
}

/**
 * Retrieves post data given a post ID or post object.
 *
 * See sanitize_post() for optional $filter values. Also, the parameter
 * `$post`, must be given as a variable, since it is passed by reference.
 *
 * @since 1.5.1
 *
 * @global WP_Post $post
 *
 * @param int|WP_Post|null $post   Optional. Post ID or post object. Defaults to global $post.
 * @param string           $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
 *                                 a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
 * @param string           $filter Optional. Type of filter to apply. Accepts 'raw', 'edit', 'db',
 *                                 or 'display'. Default 'raw'.
 * @return WP_Post|array|null Type corresponding to $output on success or null on failure.
 *                            When $output is OBJECT, a `WP_Post` instance is returned.
 */
function get_post( $post = null, $output = OBJECT, $filter = 'raw' ) {
	if ( empty( $post ) && isset( $GLOBALS['post'] ) )
		$post = $GLOBALS['post'];

	if ( $post instanceof WP_Post ) {
		$_post = $post;
	} elseif ( is_object( $post ) ) {
		if ( empty( $post->filter ) ) {
			$_post = sanitize_post( $post, 'raw' );
			$_post = new WP_Post( $_post );
		} elseif ( 'raw' == $post->filter ) {
			$_post = new WP_Post( $post );
		} else {
			$_post = WP_Post::get_instance( $post->ID );
		}
	} else {
		$_post = WP_Post::get_instance( $post );
	}

	if ( ! $_post )
		return null;

	$_post = $_post->filter( $filter );

	if ( $output == ARRAY_A )
		return $_post->to_array();
	elseif ( $output == ARRAY_N )
		return array_values( $_post->to_array() );

	return $_post;
}

/**
 * Retrieve ancestors of a post.
 *
 * @since 2.5.0
 *
 * @param int|WP_Post $post Post ID or post object.
 * @return array Ancestor IDs or empty array if none are found.
 */
function get_post_ancestors( $post ) {
	$post = get_post( $post );

	if ( ! $post || empty( $post->post_parent ) || $post->post_parent == $post->ID )
		return array();

	$ancestors = array();

	$id = $ancestors[] = $post->post_parent;

	while ( $ancestor = get_post( $id ) ) {
		// Loop detection: If the ancestor has been seen before, break.
		if ( empty( $ancestor->post_parent ) || ( $ancestor->post_parent == $post->ID ) || in_array( $ancestor->post_parent, $ancestors ) )
			break;

		$id = $ancestors[] = $ancestor->post_parent;
	}

	return $ancestors;
}

/**
 * Retrieve data from a post field based on Post ID.
 *
 * Examples of the post field will be, 'post_type', 'post_status', 'post_content',
 * etc and based off of the post object property or key names.
 *
 * The context values are based off of the taxonomy filter functions and
 * supported values are found within those functions.
 *
 * @since 2.3.0
 * @since 4.5.0 The `$post` parameter was made optional.
 *
 * @see sanitize_post_field()
 *
 * @param string      $field   Post field name.
 * @param int|WP_Post $post    Optional. Post ID or post object. Defaults to current post.
 * @param string      $context Optional. How to filter the field. Accepts 'raw', 'edit', 'db',
 *                             or 'display'. Default 'display'.
 * @return string The value of the post field on success, empty string on failure.
 */
function get_post_field( $field, $post = null, $context = 'display' ) {
	$post = get_post( $post );

	if ( !$post )
		return '';

	if ( !isset($post->$field) )
		return '';

	return sanitize_post_field($field, $post->$field, $post->ID, $context);
}

/**
 * Retrieve the mime type of an attachment based on the ID.
 *
 * This function can be used with any post type, but it makes more sense with
 * attachments.
 *
 * @since 2.0.0
 *
 * @param int|WP_Post $ID Optional. Post ID or post object. Default empty.
 * @return string|false The mime type on success, false on failure.
 */
function get_post_mime_type( $ID = '' ) {
	$post = get_post($ID);

	if ( is_object($post) )
		return $post->post_mime_type;

	return false;
}

/**
 * Retrieve the post status based on the Post ID.
 *
 * If the post ID is of an attachment, then the parent post status will be given
 * instead.
 *
 * @since 2.0.0
 *
 * @param int|WP_Post $ID Optional. Post ID or post object. Default empty.
 * @return string|false Post status on success, false on failure.
 */
function get_post_status( $ID = '' ) {
	$post = get_post($ID);

	if ( !is_object($post) )
		return false;

	if ( 'attachment' == $post->post_type ) {
		if ( 'private' == $post->post_status )
			return 'private';

		// Unattached attachments are assumed to be published.
		if ( ( 'inherit' == $post->post_status ) && ( 0 == $post->post_parent) )
			return 'publish';

		// Inherit status from the parent.
		if ( $post->post_parent && ( $post->ID != $post->post_parent ) ) {
			$parent_post_status = get_post_status( $post->post_parent );
			if ( 'trash' == $parent_post_status ) {
				return get_post_meta( $post->post_parent, '_wp_trash_meta_status', true );
			} else {
				return $parent_post_status;
			}
		}

	}

	/**
	 * Filters the post status.
	 *
	 * @since 4.4.0
	 *
	 * @param string  $post_status The post status.
	 * @param WP_Post $post        The post object.
	 */
	return apply_filters( 'get_post_status', $post->post_status, $post );
}

/**
 * Retrieve all of the WordPress supported post statuses.
 *
 * Posts have a limited set of valid status values, this provides the
 * post_status values and descriptions.
 *
 * @since 2.5.0
 *
 * @return array List of post statuses.
 */
function get_post_statuses() {
	$status = array(
		'draft'   => __( 'Draft' ),
		'pending' => __( 'Pending Review' ),
		'private' => __( 'Private' ),
		'publish' => __( 'Published' )
	);

	return $status;
}

/**
 * Retrieve all of the WordPress support page statuses.
 *
 * Pages have a limited set of valid status values, this provides the
 * post_status values and descriptions.
 *
 * @since 2.5.0
 *
 * @return array List of page statuses.
 */
function get_page_statuses() {
	$status = array(
		'draft'   => __( 'Draft' ),
		'private' => __( 'Private' ),
		'publish' => __( 'Published' )
	);

	return $status;
}

/**
 * Return statuses for privacy requests.
 *
 * @since 4.9.6
 *
 * @return array
 */
function _wp_privacy_statuses() {
	return array(
		'request-pending'   => __( 'Pending' ),      // Pending confirmation from user.
		'request-confirmed' => __( 'Confirmed' ),    // User has confirmed the action.
		'request-failed'    => __( 'Failed' ),       // User failed to confirm the action.
		'request-completed' => __( 'Completed' ),    // Admin has handled the request.
	);
}

/**
 * Register a post status. Do not use before init.
 *
 * A simple function for creating or modifying a post status based on the
 * parameters given. The function will accept an array (second optional
 * parameter), along with a string for the post status name.
 *
 * Arguments prefixed with an _underscore shouldn't be used by plugins and themes.
 *
 * @since 3.0.0
 * @global array $wp_post_statuses Inserts new post status object into the list
 *
 * @param string $post_status Name of the post status.
 * @param array|string $args {
 *     Optional. Array or string of post status arguments.
 *
 *     @type bool|string $label                     A descriptive name for the post status marked
 *                                                  for translation. Defaults to value of $post_status.
 *     @type bool|array  $label_count               Descriptive text to use for nooped plurals.
 *                                                  Default array of $label, twice
 *     @type bool        $exclude_from_search       Whether to exclude posts with this post status
 *                                                  from search results. Default is value of $internal.
 *     @type bool        $_builtin                  Whether the status is built-in. Core-use only.
 *                                                  Default false.
 *     @type bool        $public                    Whether posts of this status should be shown
 *                                                  in the front end of the site. Default false.
 *     @type bool        $internal                  Whether the status is for internal use only.
 *                                                  Default false.
 *     @type bool        $protected                 Whether posts with this status should be protected.
 *                                                  Default false.
 *     @type bool        $private                   Whether posts with this status should be private.
 *                                                  Default false.
 *     @type bool        $publicly_queryable        Whether posts with this status should be publicly-
 *                                                  queryable. Default is value of $public.
 *     @type bool        $show_in_admin_all_list    Whether to include posts in the edit listing for
 *                                                  their post type. Default is value of $internal.
 *     @type bool        $show_in_admin_status_list Show in the list of statuses with post counts at
 *                                                  the top of the edit listings,
 *                                                  e.g. All (12) | Published (9) | My Custom Status (2)
 *                                                  Default is value of $internal.
 * }
 * @return object
 */
function register_post_status( $post_status, $args = array() ) {
	global $wp_post_statuses;

	if (!is_array($wp_post_statuses))
		$wp_post_statuses = array();

	// Args prefixed with an underscore are reserved for internal use.
	$defaults = array(
		'label' => false,
		'label_count' => false,
		'exclude_from_search' => null,
		'_builtin' => false,
		'public' => null,
		'internal' => null,
		'protected' => null,
		'private' => null,
		'publicly_queryable' => null,
		'show_in_admin_status_list' => null,
		'show_in_admin_all_list' => null,
	);
	$args = wp_parse_args($args, $defaults);
	$args = (object) $args;

	$post_status = sanitize_key($post_status);
	$args->name = $post_status;

	// Set various defaults.
	if ( null === $args->public && null === $args->internal && null === $args->protected && null === $args->private )
		$args->internal = true;

	if ( null === $args->public  )
		$args->public = false;

	if ( null === $args->private  )
		$args->private = false;

	if ( null === $args->protected  )
		$args->protected = false;

	if ( null === $args->internal  )
		$args->internal = false;

	if ( null === $args->publicly_queryable )
		$args->publicly_queryable = $args->public;

	if ( null === $args->exclude_from_search )
		$args->exclude_from_search = $args->internal;

	if ( null === $args->show_in_admin_all_list )
		$args->show_in_admin_all_list = !$args->internal;

	if ( null === $args->show_in_admin_status_list )
		$args->show_in_admin_status_list = !$args->internal;

	if ( false === $args->label )
		$args->label = $post_status;

	if ( false === $args->label_count )
		$args->label_count = _n_noop( $args->label, $args->label );

	$wp_post_statuses[$post_status] = $args;

	return $args;
}

/**
 * Retrieve a post status object by name.
 *
 * @since 3.0.0
 *
 * @global array $wp_post_statuses List of post statuses.
 *
 * @see register_post_status()
 *
 * @param string $post_status The name of a registered post status.
 * @return object|null A post status object.
 */
function get_post_status_object( $post_status ) {
	global $wp_post_statuses;

	if ( empty($wp_post_statuses[$post_status]) )
		return null;

	return $wp_post_statuses[$post_status];
}

/**
 * Get a list of post statuses.
 *
 * @since 3.0.0
 *
 * @global array $wp_post_statuses List of post statuses.
 *
 * @see register_post_status()
 *
 * @param array|string $args     Optional. Array or string of post status arguments to compare against
 *                               properties of the global `$wp_post_statuses objects`. Default empty array.
 * @param string       $output   Optional. The type of output to return, either 'names' or 'objects'. Default 'names'.
 * @param string       $operator Optional. The logical operation to perform. 'or' means only one element
 *                               from the array needs to match; 'and' means all elements must match.
 *                               Default 'and'.
 * @return array A list of post status names or objects.
 */
function get_post_stati( $args = array(), $output = 'names', $operator = 'and' ) {
	global $wp_post_statuses;

	$field = ('names' == $output) ? 'name' : false;

	return wp_filter_object_list($wp_post_statuses, $args, $operator, $field);
}

/**
 * Whether the post type is hierarchical.
 *
 * A false return value might also mean that the post type does not exist.
 *
 * @since 3.0.0
 *
 * @see get_post_type_object()
 *
 * @param string $post_type Post type name
 * @return bool Whether post type is hierarchical.
 */
function is_post_type_hierarchical( $post_type ) {
	if ( ! post_type_exists( $post_type ) )
		return false;

	$post_type = get_post_type_object( $post_type );
	return $post_type->hierarchical;
}

/**
 * Determines whether a post type is registered.
 * 
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 3.0.0
 *
 * @see get_post_type_object()
 *
 * @param string $post_type Post type name.
 * @return bool Whether post type is registered.
 */
function post_type_exists( $post_type ) {
	return (bool) get_post_type_object( $post_type );
}

/**
 * Retrieves the post type of the current post or of a given post.
 *
 * @since 2.1.0
 *
 * @param int|WP_Post|null $post Optional. Post ID or post object. Default is global $post.
 * @return string|false          Post type on success, false on failure.
 */
function get_post_type( $post = null ) {
	if ( $post = get_post( $post ) )
		return $post->post_type;

	return false;
}

/**
 * Retrieves a post type object by name.
 *
 * @since 3.0.0
 * @since 4.6.0 Object returned is now an instance of WP_Post_Type.
 *
 * @global array $wp_post_types List of post types.
 *
 * @see register_post_type()
 *
 * @param string $post_type The name of a registered post type.
 * @return WP_Post_Type|null WP_Post_Type object if it exists, null otherwise.
 */
function get_post_type_object( $post_type ) {
	global $wp_post_types;

	if ( ! is_scalar( $post_type ) || empty( $wp_post_types[ $post_type ] ) ) {
		return null;
	}

	return $wp_post_types[ $post_type ];
}

/**
 * Get a list of all registered post type objects.
 *
 * @since 2.9.0
 *
 * @global array $wp_post_types List of post types.
 *
 * @see register_post_type() for accepted arguments.
 *
 * @param array|string $args     Optional. An array of key => value arguments to match against
 *                               the post type objects. Default empty array.
 * @param string       $output   Optional. The type of output to return. Accepts post type 'names'
 *                               or 'objects'. Default 'names'.
 * @param string       $operator Optional. The logical operation to perform. 'or' means only one
 *                               element from the array needs to match; 'and' means all elements
 *                               must match; 'not' means no elements may match. Default 'and'.
 * @return array A list of post type names or objects.
 */
function get_post_types( $args = array(), $output = 'names', $operator = 'and' ) {
	global $wp_post_types;

	$field = ('names' == $output) ? 'name' : false;

	return wp_filter_object_list($wp_post_types, $args, $operator, $field);
}

/**
 * Registers a post type.
 *
 * Note: Post type registrations should not be hooked before the
 * {@see 'init'} action. Also, any taxonomy connections should be
 * registered via the `$taxonomies` argument to ensure consistency
 * when hooks such as {@see 'parse_query'} or {@see 'pre_get_posts'}
 * are used.
 *
 * Post types can support any number of built-in core features such
 * as meta boxes, custom fields, post thumbnails, post statuses,
 * comments, and more. See the `$supports` argument for a complete
 * list of supported features.
 *
 * @since 2.9.0
 * @since 3.0.0 The `show_ui` argument is now enforced on the new post screen.
 * @since 4.4.0 The `show_ui` argument is now enforced on the post type listing
 *              screen and post editing screen.
 * @since 4.6.0 Post type object returned is now an instance of WP_Post_Type.
 * @since 4.7.0 Introduced `show_in_rest`, 'rest_base' and 'rest_controller_class'
 *              arguments to register the post type in REST API.
 *
 * @global array $wp_post_types List of post types.
 *
 * @param string $post_type Post type key. Must not exceed 20 characters and may
 *                          only contain lowercase alphanumeric characters, dashes,
 *                          and underscores. See sanitize_key().
 * @param array|string $args {
 *     Array or string of arguments for registering a post type.
 *
 *     @type string      $label                 Name of the post type shown in the menu. Usually plural.
 *                                              Default is value of $labels['name'].
 *     @type array       $labels                An array of labels for this post type. If not set, post
 *                                              labels are inherited for non-hierarchical types and page
 *                                              labels for hierarchical ones. See get_post_type_labels() for a full
 *                                              list of supported labels.
 *     @type string      $description           A short descriptive summary of what the post type is.
 *                                              Default empty.
 *     @type bool        $public                Whether a post type is intended for use publicly either via
 *                                              the admin interface or by front-end users. While the default
 *                                              settings of $exclude_from_search, $publicly_queryable, $show_ui,
 *                                              and $show_in_nav_menus are inherited from public, each does not
 *                                              rely on this relationship and controls a very specific intention.
 *                                              Default false.
 *     @type bool        $hierarchical          Whether the post type is hierarchical (e.g. page). Default false.
 *     @type bool        $exclude_from_search   Whether to exclude posts with this post type from front end search
 *                                              results. Default is the opposite value of $public.
 *     @type bool        $publicly_queryable    Whether queries can be performed on the front end for the post type
 *                                              as part of parse_request(). Endpoints would include:
 *                                              * ?post_type={post_type_key}
 *                                              * ?{post_type_key}={single_post_slug}
 *                                              * ?{post_type_query_var}={single_post_slug}
 *                                              If not set, the default is inherited from $public.
 *     @type bool        $show_ui               Whether to generate and allow a UI for managing this post type in the
 *                                              admin. Default is value of $public.
 *     @type bool        $show_in_menu          Where to show the post type in the admin menu. To work, $show_ui
 *                                              must be true. If true, the post type is shown in its own top level
 *                                              menu. If false, no menu is shown. If a string of an existing top
 *                                              level menu (eg. 'tools.php' or 'edit.php?post_type=page'), the post
 *                                              type will be placed as a sub-menu of that.
 *                                              Default is value of $show_ui.
 *     @type bool        $show_in_nav_menus     Makes this post type available for selection in navigation menus.
 *                                              Default is value $public.
 *     @type bool        $show_in_admin_bar     Makes this post type available via the admin bar. Default is value
 *                                              of $show_in_menu.
 *     @type bool        $show_in_rest          Whether to add the post type route in the REST API 'wp/v2' namespace.
 *     @type string      $rest_base             To change the base url of REST API route. Default is $post_type.
 *     @type string      $rest_controller_class REST API Controller class name. Default is 'WP_REST_Posts_Controller'.
 *     @type int         $menu_position         The position in the menu order the post type should appear. To work,
 *                                              $show_in_menu must be true. Default null (at the bottom).
 *     @type string      $menu_icon             The url to the icon to be used for this menu. Pass a base64-encoded
 *                                              SVG using a data URI, which will be colored to match the color scheme
 *                                              -- this should begin with 'data:image/svg+xml;base64,'. Pass the name
 *                                              of a Dashicons helper class to use a font icon, e.g.
 *                                              'dashicons-chart-pie'. Pass 'none' to leave div.wp-menu-image empty
 *                                              so an icon can be added via CSS. Defaults to use the posts icon.
 *     @type string      $capability_type       The string to use to build the read, edit, and delete capabilities.
 *                                              May be passed as an array to allow for alternative plurals when using
 *                                              this argument as a base to construct the capabilities, e.g.
 *                                              array('story', 'stories'). Default 'post'.
 *     @type array       $capabilities          Array of capabilities for this post type. $capability_type is used
 *                                              as a base to construct capabilities by default.
 *                                              See get_post_type_capabilities().
 *     @type bool        $map_meta_cap          Whether to use the internal default meta capability handling.
 *                                              Default false.
 *     @type array       $supports              Core feature(s) the post type supports. Serves as an alias for calling
 *                                              add_post_type_support() directly. Core features include 'title',
 *                                              'editor', 'comments', 'revisions', 'trackbacks', 'author', 'excerpt',
 *                                              'page-attributes', 'thumbnail', 'custom-fields', and 'post-formats'.
 *                                              Additionally, the 'revisions' feature dictates whether the post type
 *                                              will store revisions, and the 'comments' feature dictates whether the
 *                                              comments count will show on the edit screen. Defaults is an array
 *                                              containing 'title' and 'editor'.
 *     @type callable    $register_meta_box_cb  Provide a callback function that sets up the meta boxes for the
 *                                              edit form. Do remove_meta_box() and add_meta_box() calls in the
 *                                              callback. Default null.
 *     @type array       $taxonomies            An array of taxonomy identifiers that will be registered for the
 *                                              post type. Taxonomies can be registered later with register_taxonomy()
 *                                              or register_taxonomy_for_object_type().
 *                                              Default empty array.
 *     @type bool|string $has_archive           Whether there should be post type archives, or if a string, the
 *                                              archive slug to use. Will generate the proper rewrite rules if
 *                                              $rewrite is enabled. Default false.
 *     @type bool|array  $rewrite              {
 *         Triggers the handling of rewrites for this post type. To prevent rewrite, set to false.
 *         Defaults to true, using $post_type as slug. To specify rewrite rules, an array can be
 *         passed with any of these keys:
 *
 *         @type string $slug       Customize the permastruct slug. Defaults to $post_type key.
 *         @type bool   $with_front Whether the permastruct should be prepended with WP_Rewrite::$front.
 *                                  Default true.
 *         @type bool   $feeds      Whether the feed permastruct should be built for this post type.
 *                                  Default is value of $has_archive.
 *         @type bool   $pages      Whether the permastruct should provide for pagination. Default true.
 *         @type const  $ep_mask    Endpoint mask to assign. If not specified and permalink_epmask is set,
 *                                  inherits from $permalink_epmask. If not specified and permalink_epmask
 *                                  is not set, defaults to EP_PERMALINK.
 *     }
 *     @type string|bool $query_var             Sets the query_var key for this post type. Defaults to $post_type
 *                                              key. If false, a post type cannot be loaded at
 *                                              ?{query_var}={post_slug}. If specified as a string, the query
 *                                              ?{query_var_string}={post_slug} will be valid.
 *     @type bool        $can_export            Whether to allow this post type to be exported. Default true.
 *     @type bool        $delete_with_user      Whether to delete posts of this type when deleting a user. If true,
 *                                              posts of this type belonging to the user will be moved to trash
 *                                              when then user is deleted. If false, posts of this type belonging
 *                                              to the user will *not* be trashed or deleted. If not set (the default),
 *                                              posts are trashed if post_type_supports('author'). Otherwise posts
 *                                              are not trashed or deleted. Default null.
 *     @type bool        $_builtin              FOR INTERNAL USE ONLY! True if this post type is a native or
 *                                              "built-in" post_type. Default false.
 *     @type string      $_edit_link            FOR INTERNAL USE ONLY! URL segment to use for edit link of
 *                                              this post type. Default 'post.php?post=%d'.
 * }
 * @return WP_Post_Type|WP_Error The registered post type object, or an error object.
 */
function register_post_type( $post_type, $args = array() ) {
	global $wp_post_types;

	if ( ! is_array( $wp_post_types ) ) {
		$wp_post_types = array();
	}

	// Sanitize post type name
	$post_type = sanitize_key( $post_type );

	if ( empty( $post_type ) || strlen( $post_type ) > 20 ) {
		_doing_it_wrong( __FUNCTION__, __( 'Post type names must be between 1 and 20 characters in length.' ), '4.2.0' );
		return new WP_Error( 'post_type_length_invalid', __( 'Post type names must be between 1 and 20 characters in length.' ) );
	}

	$post_type_object = new WP_Post_Type( $post_type, $args );
	$post_type_object->add_supports();
	$post_type_object->add_rewrite_rules();
	$post_type_object->register_meta_boxes();

	$wp_post_types[ $post_type ] = $post_type_object;

	$post_type_object->add_hooks();
	$post_type_object->register_taxonomies();

	/**
	 * Fires after a post type is registered.
	 *
	 * @since 3.3.0
	 * @since 4.6.0 Converted the `$post_type` parameter to accept a WP_Post_Type object.
	 *
	 * @param string       $post_type        Post type.
	 * @param WP_Post_Type $post_type_object Arguments used to register the post type.
	 */
	do_action( 'registered_post_type', $post_type, $post_type_object );

	return $post_type_object;
}

/**
 * Unregisters a post type.
 *
 * Can not be used to unregister built-in post types.
 *
 * @since 4.5.0
 *
 * @global array $wp_post_types List of post types.
 *
 * @param string $post_type Post type to unregister.
 * @return bool|WP_Error True on success, WP_Error on failure or if the post type doesn't exist.
 */
function unregister_post_type( $post_type ) {
	global $wp_post_types;

	if ( ! post_type_exists( $post_type ) ) {
		return new WP_Error( 'invalid_post_type', __( 'Invalid post type.' ) );
	}

	$post_type_object = get_post_type_object( $post_type );

	// Do not allow unregistering internal post types.
	if ( $post_type_object->_builtin ) {
		return new WP_Error( 'invalid_post_type', __( 'Unregistering a built-in post type is not allowed' ) );
	}

	$post_type_object->remove_supports();
	$post_type_object->remove_rewrite_rules();
	$post_type_object->unregister_meta_boxes();
	$post_type_object->remove_hooks();
	$post_type_object->unregister_taxonomies();

	unset( $wp_post_types[ $post_type ] );

	/**
	 * Fires after a post type was unregistered.
	 *
	 * @since 4.5.0
	 *
	 * @param string $post_type Post type key.
	 */
	do_action( 'unregistered_post_type', $post_type );

	return true;
}

/**
 * Build an object with all post type capabilities out of a post type object
 *
 * Post type capabilities use the 'capability_type' argument as a base, if the
 * capability is not set in the 'capabilities' argument array or if the
 * 'capabilities' argument is not supplied.
 *
 * The capability_type argument can optionally be registered as an array, with
 * the first value being singular and the second plural, e.g. array('story, 'stories')
 * Otherwise, an 's' will be added to the value for the plural form. After
 * registration, capability_type will always be a string of the singular value.
 *
 * By default, seven keys are accepted as part of the capabilities array:
 *
 * - edit_post, read_post, and delete_post are meta capabilities, which are then
 *   generally mapped to corresponding primitive capabilities depending on the
 *   context, which would be the post being edited/read/deleted and the user or
 *   role being checked. Thus these capabilities would generally not be granted
 *   directly to users or roles.
 *
 * - edit_posts - Controls whether objects of this post type can be edited.
 * - edit_others_posts - Controls whether objects of this type owned by other users
 *   can be edited. If the post type does not support an author, then this will
 *   behave like edit_posts.
 * - publish_posts - Controls publishing objects of this post type.
 * - read_private_posts - Controls whether private objects can be read.
 *
 * These four primitive capabilities are checked in core in various locations.
 * There are also seven other primitive capabilities which are not referenced
 * directly in core, except in map_meta_cap(), which takes the three aforementioned
 * meta capabilities and translates them into one or more primitive capabilities
 * that must then be checked against the user or role, depending on the context.
 *
 * - read - Controls whether objects of this post type can be read.
 * - delete_posts - Controls whether objects of this post type can be deleted.
 * - delete_private_posts - Controls whether private objects can be deleted.
 * - delete_published_posts - Controls whether published objects can be deleted.
 * - delete_others_posts - Controls whether objects owned by other users can be
 *   can be deleted. If the post type does not support an author, then this will
 *   behave like delete_posts.
 * - edit_private_posts - Controls whether private objects can be edited.
 * - edit_published_posts - Controls whether published objects can be edited.
 *
 * These additional capabilities are only used in map_meta_cap(). Thus, they are
 * only assigned by default if the post type is registered with the 'map_meta_cap'
 * argument set to true (default is false).
 *
 * @since 3.0.0
 *
 * @see register_post_type()
 * @see map_meta_cap()
 *
 * @param object $args Post type registration arguments.
 * @return object Object with all the capabilities as member variables.
 */
function get_post_type_capabilities( $args ) {
	if ( ! is_array( $args->capability_type ) )
		$args->capability_type = array( $args->capability_type, $args->capability_type . 's' );

	// Singular base for meta capabilities, plural base for primitive capabilities.
	list( $singular_base, $plural_base ) = $args->capability_type;

	$default_capabilities = array(
		// Meta capabilities
		'edit_post'          => 'edit_'         . $singular_base,
		'read_post'          => 'read_'         . $singular_base,
		'delete_post'        => 'delete_'       . $singular_base,
		// Primitive capabilities used outside of map_meta_cap():
		'edit_posts'         => 'edit_'         . $plural_base,
		'edit_others_posts'  => 'edit_others_'  . $plural_base,
		'publish_posts'      => 'publish_'      . $plural_base,
		'read_private_posts' => 'read_private_' . $plural_base,
	);

	// Primitive capabilities used within map_meta_cap():
	if ( $args->map_meta_cap ) {
		$default_capabilities_for_mapping = array(
			'read'                   => 'read',
			'delete_posts'           => 'delete_'           . $plural_base,
			'delete_private_posts'   => 'delete_private_'   . $plural_base,
			'delete_published_posts' => 'delete_published_' . $plural_base,
			'delete_others_posts'    => 'delete_others_'    . $plural_base,
			'edit_private_posts'     => 'edit_private_'     . $plural_base,
			'edit_published_posts'   => 'edit_published_'   . $plural_base,
		);
		$default_capabilities = array_merge( $default_capabilities, $default_capabilities_for_mapping );
	}

	$capabilities = array_merge( $default_capabilities, $args->capabilities );

	// Post creation capability simply maps to edit_posts by default:
	if ( ! isset( $capabilities['create_posts'] ) )
		$capabilities['create_posts'] = $capabilities['edit_posts'];

	// Remember meta capabilities for future reference.
	if ( $args->map_meta_cap )
		_post_type_meta_capabilities( $capabilities );

	return (object) $capabilities;
}

/**
 * Store or return a list of post type meta caps for map_meta_cap().
 *
 * @since 3.1.0
 * @access private
 *
 * @global array $post_type_meta_caps Used to store meta capabilities.
 *
 * @param array $capabilities Post type meta capabilities.
 */
function _post_type_meta_capabilities( $capabilities = null ) {
	global $post_type_meta_caps;

	foreach ( $capabilities as $core => $custom ) {
		if ( in_array( $core, array( 'read_post', 'delete_post', 'edit_post' ) ) ) {
			$post_type_meta_caps[ $custom ] = $core;
		}
	}
}

/**
 * Builds an object with all post type labels out of a post type object.
 *
 * Accepted keys of the label array in the post type object:
 *
 * - `name` - General name for the post type, usually plural. The same and overridden
 *          by `$post_type_object->label`. Default is 'Posts' / 'Pages'.
 * - `singular_name` - Name for one object of this post type. Default is 'Post' / 'Page'.
 * - `add_new` - Default is 'Add New' for both hierarchical and non-hierarchical types.
 *             When internationalizing this string, please use a {@link https://codex.wordpress.org/I18n_for_WordPress_Developers#Disambiguation_by_context gettext context}
 *             matching your post type. Example: `_x( 'Add New', 'product', 'textdomain' );`.
 * - `add_new_item` - Label for adding a new singular item. Default is 'Add New Post' / 'Add New Page'.
 * - `edit_item` - Label for editing a singular item. Default is 'Edit Post' / 'Edit Page'.
 * - `new_item` - Label for the new item page title. Default is 'New Post' / 'New Page'.
 * - `view_item` - Label for viewing a singular item. Default is 'View Post' / 'View Page'.
 * - `view_items` - Label for viewing post type archives. Default is 'View Posts' / 'View Pages'.
 * - `search_items` - Label for searching plural items. Default is 'Search Posts' / 'Search Pages'.
 * - `not_found` - Label used when no items are found. Default is 'No posts found' / 'No pages found'.
 * - `not_found_in_trash` - Label used when no items are in the trash. Default is 'No posts found in Trash' /
 *                        'No pages found in Trash'.
 * - `parent_item_colon` - Label used to prefix parents of hierarchical items. Not used on non-hierarchical
 *                       post types. Default is 'Parent Page:'.
 * - `all_items` - Label to signify all items in a submenu link. Default is 'All Posts' / 'All Pages'.
 * - `archives` - Label for archives in nav menus. Default is 'Post Archives' / 'Page Archives'.
 * - `attributes` - Label for the attributes meta box. Default is 'Post Attributes' / 'Page Attributes'.
 * - `insert_into_item` - Label for the media frame button. Default is 'Insert into post' / 'Insert into page'.
 * - `uploaded_to_this_item` - Label for the media frame filter. Default is 'Uploaded to this post' /
 *                           'Uploaded to this page'.
 * - `featured_image` - Label for the Featured Image meta box title. Default is 'Featured Image'.
 * - `set_featured_image` - Label for setting the featured image. Default is 'Set featured image'.
 * - `remove_featured_image` - Label for removing the featured image. Default is 'Remove featured image'.
 * - `use_featured_image` - Label in the media frame for using a featured image. Default is 'Use as featured image'.
 * - `menu_name` - Label for the menu name. Default is the same as `name`.
 * - `filter_items_list` - Label for the table views hidden heading. Default is 'Filter posts list' /
 *                       'Filter pages list'.
 * - `items_list_navigation` - Label for the table pagination hidden heading. Default is 'Posts list navigation' /
 *                           'Pages list navigation'.
 * - `items_list` - Label for the table hidden heading. Default is 'Posts list' / 'Pages list'.
 * - `item_published` - Label used when an item is published. Default is 'Post published.' / 'Page published.'
 * - `item_published_privately` - Label used when an item is published with private visibility.
 *                              Default is 'Post published privately.' / 'Page published privately.'
 * - `item_reverted_to_draft` - Label used when an item is switched to a draft.
 *                            Default is 'Post reverted to draft.' / 'Page reverted to draft.'
 * - `item_scheduled` - Label used when an item is scheduled for publishing. Default is 'Post scheduled.' /
 *                    'Page scheduled.'
 * - `item_updated` - Label used when an item is updated. Default is 'Post updated.' / 'Page updated.'
 *
 * Above, the first default value is for non-hierarchical post types (like posts)
 * and the second one is for hierarchical post types (like pages).
 *
 * Note: To set labels used in post type admin notices, see the {@see 'post_updated_messages'} filter.
 *
 * @since 3.0.0
 * @since 4.3.0 Added the `featured_image`, `set_featured_image`, `remove_featured_image`,
 *              and `use_featured_image` labels.
 * @since 4.4.0 Added the `archives`, `insert_into_item`, `uploaded_to_this_item`, `filter_items_list`,
 *              `items_list_navigation`, and `items_list` labels.
 * @since 4.6.0 Converted the `$post_type` parameter to accept a WP_Post_Type object.
 * @since 4.7.0 Added the `view_items` and `attributes` labels.
 * @since 5.0.0 Added the `item_published`, `item_published_privately`, `item_reverted_to_draft`,
 *              `item_scheduled`, and `item_updated` labels.
 *
 * @access private
 *
 * @param object|WP_Post_Type $post_type_object Post type object.
 * @return object Object with all the labels as member variables.
 */
function get_post_type_labels( $post_type_object ) {
	$nohier_vs_hier_defaults = array(
		'name' => array( _x('Posts', 'post type general name'), _x('Pages', 'post type general name') ),
		'singular_name' => array( _x('Post', 'post type singular name'), _x('Page', 'post type singular name') ),
		'add_new' => array( _x('Add New', 'post'), _x('Add New', 'page') ),
		'add_new_item' => array( __('Add New Post'), __('Add New Page') ),
		'edit_item' => array( __('Edit Post'), __('Edit Page') ),
		'new_item' => array( __('New Post'), __('New Page') ),
		'view_item' => array( __('View Post'), __('View Page') ),
		'view_items' => array( __('View Posts'), __('View Pages') ),
		'search_items' => array( __('Search Posts'), __('Search Pages') ),
		'not_found' => array( __('No posts found.'), __('No pages found.') ),
		'not_found_in_trash' => array( __('No posts found in Trash.'), __('No pages found in Trash.') ),
		'parent_item_colon' => array( null, __('Parent Page:') ),
		'all_items' => array( __( 'All Posts' ), __( 'All Pages' ) ),
		'archives' => array( __( 'Post Archives' ), __( 'Page Archives' ) ),
		'attributes' => array( __( 'Post Attributes' ), __( 'Page Attributes' ) ),
		'insert_into_item' => array( __( 'Insert into post' ), __( 'Insert into page' ) ),
		'uploaded_to_this_item' => array( __( 'Uploaded to this post' ), __( 'Uploaded to this page' ) ),
		'featured_image' => array( _x( 'Featured Image', 'post' ), _x( 'Featured Image', 'page' ) ),
		'set_featured_image' => array( _x( 'Set featured image', 'post' ), _x( 'Set featured image', 'page' ) ),
		'remove_featured_image' => array( _x( 'Remove featured image', 'post' ), _x( 'Remove featured image', 'page' ) ),
		'use_featured_image' => array( _x( 'Use as featured image', 'post' ), _x( 'Use as featured image', 'page' ) ),
		'filter_items_list' => array( __( 'Filter posts list' ), __( 'Filter pages list' ) ),
		'items_list_navigation' => array( __( 'Posts list navigation' ), __( 'Pages list navigation' ) ),
		'items_list' => array( __( 'Posts list' ), __( 'Pages list' ) ),
		'item_published' => array( __( 'Post published.' ), __( 'Page published.' ) ),
		'item_published_privately' => array( __( 'Post published privately.' ), __( 'Page published privately.' ) ),
		'item_reverted_to_draft' => array( __( 'Post reverted to draft.' ), __( 'Page reverted to draft.' ) ),
		'item_scheduled' => array( __( 'Post scheduled.' ), __( 'Page scheduled.' ) ),
		'item_updated' => array( __( 'Post updated.' ), __( 'Page updated.' ) ),
	);
	$nohier_vs_hier_defaults['menu_name'] = $nohier_vs_hier_defaults['name'];

	$labels = _get_custom_object_labels( $post_type_object, $nohier_vs_hier_defaults );

	$post_type = $post_type_object->name;

	$default_labels = clone $labels;

	/**
	 * Filters the labels of a specific post type.
	 *
	 * The dynamic portion of the hook name, `$post_type`, refers to
	 * the post type slug.
	 *
	 * @since 3.5.0
	 *
	 * @see get_post_type_labels() for the full list of labels.
	 *
	 * @param object $labels Object with labels for the post type as member variables.
	 */
	$labels = apply_filters( "post_type_labels_{$post_type}", $labels );

	// Ensure that the filtered labels contain all required default values.
	$labels = (object) array_merge( (array) $default_labels, (array) $labels );

	return $labels;
}

/**
 * Build an object with custom-something object (post type, taxonomy) labels
 * out of a custom-something object
 *
 * @since 3.0.0
 * @access private
 *
 * @param object $object                  A custom-something object.
 * @param array  $nohier_vs_hier_defaults Hierarchical vs non-hierarchical default labels.
 * @return object Object containing labels for the given custom-something object.
 */
function _get_custom_object_labels( $object, $nohier_vs_hier_defaults ) {
	$object->labels = (array) $object->labels;

	if ( isset( $object->label ) && empty( $object->labels['name'] ) )
		$object->labels['name'] = $object->label;

	if ( !isset( $object->labels['singular_name'] ) && isset( $object->labels['name'] ) )
		$object->labels['singular_name'] = $object->labels['name'];

	if ( ! isset( $object->labels['name_admin_bar'] ) )
		$object->labels['name_admin_bar'] = isset( $object->labels['singular_name'] ) ? $object->labels['singular_name'] : $object->name;

	if ( !isset( $object->labels['menu_name'] ) && isset( $object->labels['name'] ) )
		$object->labels['menu_name'] = $object->labels['name'];

	if ( !isset( $object->labels['all_items'] ) && isset( $object->labels['menu_name'] ) )
		$object->labels['all_items'] = $object->labels['menu_name'];

	if ( !isset( $object->labels['archives'] ) && isset( $object->labels['all_items'] ) ) {
		$object->labels['archives'] = $object->labels['all_items'];
	}

	$defaults = array();
	foreach ( $nohier_vs_hier_defaults as $key => $value ) {
		$defaults[$key] = $object->hierarchical ? $value[1] : $value[0];
	}
	$labels = array_merge( $defaults, $object->labels );
	$object->labels = (object) $object->labels;

	return (object) $labels;
}

/**
 * Add submenus for post types.
 *
 * @access private
 * @since 3.1.0
 */
function _add_post_type_submenus() {
	foreach ( get_post_types( array( 'show_ui' => true ) ) as $ptype ) {
		$ptype_obj = get_post_type_object( $ptype );
		// Sub-menus only.
		if ( ! $ptype_obj->show_in_menu || $ptype_obj->show_in_menu === true )
			continue;
		add_submenu_page( $ptype_obj->show_in_menu, $ptype_obj->labels->name, $ptype_obj->labels->all_items, $ptype_obj->cap->edit_posts, "edit.php?post_type=$ptype" );
	}
}

/**
 * Register support of certain features for a post type.
 *
 * All core features are directly associated with a functional area of the edit
 * screen, such as the editor or a meta box. Features include: 'title', 'editor',
 * 'comments', 'revisions', 'trackbacks', 'author', 'excerpt', 'page-attributes',
 * 'thumbnail', 'custom-fields', and 'post-formats'.
 *
 * Additionally, the 'revisions' feature dictates whether the post type will
 * store revisions, and the 'comments' feature dictates whether the comments
 * count will show on the edit screen.
 *
 * @since 3.0.0
 *
 * @global array $_wp_post_type_features
 *
 * @param string       $post_type The post type for which to add the feature.
 * @param string|array $feature   The feature being added, accepts an array of
 *                                feature strings or a single string.
 */
function add_post_type_support( $post_type, $feature ) {
	global $_wp_post_type_features;

	$features = (array) $feature;
	foreach ($features as $feature) {
		if ( func_num_args() == 2 )
			$_wp_post_type_features[$post_type][$feature] = true;
		else
			$_wp_post_type_features[$post_type][$feature] = array_slice( func_get_args(), 2 );
	}
}

/**
 * Remove support for a feature from a post type.
 *
 * @since 3.0.0
 *
 * @global array $_wp_post_type_features
 *
 * @param string $post_type The post type for which to remove the feature.
 * @param string $feature   The feature being removed.
 */
function remove_post_type_support( $post_type, $feature ) {
	global $_wp_post_type_features;

	unset( $_wp_post_type_features[ $post_type ][ $feature ] );
}

/**
 * Get all the post type features
 *
 * @since 3.4.0
 *
 * @global array $_wp_post_type_features
 *
 * @param string $post_type The post type.
 * @return array Post type supports list.
 */
function get_all_post_type_supports( $post_type ) {
	global $_wp_post_type_features;

	if ( isset( $_wp_post_type_features[$post_type] ) )
		return $_wp_post_type_features[$post_type];

	return array();
}

/**
 * Check a post type's support for a given feature.
 *
 * @since 3.0.0
 *
 * @global array $_wp_post_type_features
 *
 * @param string $post_type The post type being checked.
 * @param string $feature   The feature being checked.
 * @return bool Whether the post type supports the given feature.
 */
function post_type_supports( $post_type, $feature ) {
	global $_wp_post_type_features;

	return ( isset( $_wp_post_type_features[$post_type][$feature] ) );
}

/**
 * Retrieves a list of post type names that support a specific feature.
 *
 * @since 4.5.0
 *
 * @global array $_wp_post_type_features Post type features
 *
 * @param array|string $feature  Single feature or an array of features the post types should support.
 * @param string       $operator Optional. The logical operation to perform. 'or' means
 *                               only one element from the array needs to match; 'and'
 *                               means all elements must match; 'not' means no elements may
 *                               match. Default 'and'.
 * @return array A list of post type names.
 */
function get_post_types_by_support( $feature, $operator = 'and' ) {
	global $_wp_post_type_features;

	$features = array_fill_keys( (array) $feature, true );

	return array_keys( wp_filter_object_list( $_wp_post_type_features, $features, $operator ) );
}

/**
 * Update the post type for the post ID.
 *
 * The page or post cache will be cleaned for the post ID.
 *
 * @since 2.5.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int    $post_id   Optional. Post ID to change post type. Default 0.
 * @param string $post_type Optional. Post type. Accepts 'post' or 'page' to
 *                          name a few. Default 'post'.
 * @return int|false Amount of rows changed. Should be 1 for success and 0 for failure.
 */
function set_post_type( $post_id = 0, $post_type = 'post' ) {
	global $wpdb;

	$post_type = sanitize_post_field('post_type', $post_type, $post_id, 'db');
	$return = $wpdb->update( $wpdb->posts, array('post_type' => $post_type), array('ID' => $post_id) );

	clean_post_cache( $post_id );

	return $return;
}

/**
 * Determines whether a post type is considered "viewable".
 *
 * For built-in post types such as posts and pages, the 'public' value will be evaluated.
 * For all others, the 'publicly_queryable' value will be used.
 *
 * @since 4.4.0
 * @since 4.5.0 Added the ability to pass a post type name in addition to object.
 * @since 4.6.0 Converted the `$post_type` parameter to accept a WP_Post_Type object.
 *
 * @param string|WP_Post_Type $post_type Post type name or object.
 * @return bool Whether the post type should be considered viewable.
 */
function is_post_type_viewable( $post_type ) {
	if ( is_scalar( $post_type ) ) {
		$post_type = get_post_type_object( $post_type );
		if ( ! $post_type ) {
			return false;
		}
	}

	return $post_type->publicly_queryable || ( $post_type->_builtin && $post_type->public );
}

/**
 * Retrieve list of latest posts or posts matching criteria.
 *
 * The defaults are as follows:
 *
 * @since 1.2.0
 *
 * @see WP_Query::parse_query()
 *
 * @param array $args {
 *     Optional. Arguments to retrieve posts. See WP_Query::parse_query() for all
 *     available arguments.
 *
 *     @type int        $numberposts      Total number of posts to retrieve. Is an alias of $posts_per_page
 *                                        in WP_Query. Accepts -1 for all. Default 5.
 *     @type int|string $category         Category ID or comma-separated list of IDs (this or any children).
 *                                        Is an alias of $cat in WP_Query. Default 0.
 *     @type array      $include          An array of post IDs to retrieve, sticky posts will be included.
 *                                        Is an alias of $post__in in WP_Query. Default empty array.
 *     @type array      $exclude          An array of post IDs not to retrieve. Default empty array.
 *     @type bool       $suppress_filters Whether to suppress filters. Default true.
 * }
 * @return array List of posts.
 */
function get_posts( $args = null ) {
	$defaults = array(
		'numberposts' => 5,
		'category' => 0, 'orderby' => 'date',
		'order' => 'DESC', 'include' => array(),
		'exclude' => array(), 'meta_key' => '',
		'meta_value' =>'', 'post_type' => 'post',
		'suppress_filters' => true
	);

	$r = wp_parse_args( $args, $defaults );
	if ( empty( $r['post_status'] ) )
		$r['post_status'] = ( 'attachment' == $r['post_type'] ) ? 'inherit' : 'publish';
	if ( ! empty($r['numberposts']) && empty($r['posts_per_page']) )
		$r['posts_per_page'] = $r['numberposts'];
	if ( ! empty($r['category']) )
		$r['cat'] = $r['category'];
	if ( ! empty($r['include']) ) {
		$incposts = wp_parse_id_list( $r['include'] );
		$r['posts_per_page'] = count($incposts);  // only the number of posts included
		$r['post__in'] = $incposts;
	} elseif ( ! empty($r['exclude']) )
		$r['post__not_in'] = wp_parse_id_list( $r['exclude'] );

	$r['ignore_sticky_posts'] = true;
	$r['no_found_rows'] = true;

	$get_posts = new WP_Query;
	return $get_posts->query($r);

}

//
// Post meta functions
//

/**
 * Add meta data field to a post.
 *
 * Post meta data is called "Custom Fields" on the Administration Screen.
 *
 * @since 1.5.0
 *
 * @param int    $post_id    Post ID.
 * @param string $meta_key   Metadata name.
 * @param mixed  $meta_value Metadata value. Must be serializable if non-scalar.
 * @param bool   $unique     Optional. Whether the same key should not be added.
 *                           Default false.
 * @return int|false Meta ID on success, false on failure.
 */
function add_post_meta( $post_id, $meta_key, $meta_value, $unique = false ) {
	// Make sure meta is added to the post, not a revision.
	$the_post = wp_is_post_revision( $post_id );
	if ( $the_post ) {
		$post_id = $the_post;
	}

	return add_metadata( 'post', $post_id, $meta_key, $meta_value, $unique );
}

/**
 * Remove metadata matching criteria from a post.
 *
 * You can match based on the key, or key and value. Removing based on key and
 * value, will keep from removing duplicate metadata with the same key. It also
 * allows removing all metadata matching key, if needed.
 *
 * @since 1.5.0
 *
 * @param int    $post_id    Post ID.
 * @param string $meta_key   Metadata name.
 * @param mixed  $meta_value Optional. Metadata value. Must be serializable if
 *                           non-scalar. Default empty.
 * @return bool True on success, false on failure.
 */
function delete_post_meta( $post_id, $meta_key, $meta_value = '' ) {
	// Make sure meta is added to the post, not a revision.
	$the_post = wp_is_post_revision( $post_id );
	if ( $the_post ) {
		$post_id = $the_post;
	}

	return delete_metadata( 'post', $post_id, $meta_key, $meta_value );
}

/**
 * Retrieve post meta field for a post.
 *
 * @since 1.5.0
 *
 * @param int    $post_id Post ID.
 * @param string $key     Optional. The meta key to retrieve. By default, returns
 *                        data for all keys. Default empty.
 * @param bool   $single  Optional. Whether to return a single value. Default false.
 * @return mixed Will be an array if $single is false. Will be value of meta data
 *               field if $single is true.
 */
function get_post_meta( $post_id, $key = '', $single = false ) {
	return get_metadata('post', $post_id, $key, $single);
}

/**
 * Update post meta field based on post ID.
 *
 * Use the $prev_value parameter to differentiate between meta fields with the
 * same key and post ID.
 *
 * If the meta field for the post does not exist, it will be added.
 *
 * @since 1.5.0
 *
 * @param int    $post_id    Post ID.
 * @param string $meta_key   Metadata key.
 * @param mixed  $meta_value Metadata value. Must be serializable if non-scalar.
 * @param mixed  $prev_value Optional. Previous value to check before removing.
 *                           Default empty.
 * @return int|bool Meta ID if the key didn't exist, true on successful update,
 *                  false on failure.
 */
function update_post_meta( $post_id, $meta_key, $meta_value, $prev_value = '' ) {
	// Make sure meta is added to the post, not a revision.
	$the_post = wp_is_post_revision( $post_id );
	if ( $the_post ) {
		$post_id = $the_post;
	}

	return update_metadata( 'post', $post_id, $meta_key, $meta_value, $prev_value );
}

/**
 * Delete everything from post meta matching meta key.
 *
 * @since 2.3.0
 *
 * @param string $post_meta_key Key to search for when deleting.
 * @return bool Whether the post meta key was deleted from the database.
 */
function delete_post_meta_by_key( $post_meta_key ) {
	return delete_metadata( 'post', null, $post_meta_key, '', true );
}

/**
 * Registers a meta key for posts.
 *
 * @since 4.9.8
 *
 * @param string $post_type Post type to register a meta key for. Pass an empty string
 *                          to register the meta key across all existing post types.
 * @param string $meta_key  The meta key to register.
 * @param array  $args      Data used to describe the meta key when registered. See
 *                          {@see register_meta()} for a list of supported arguments.
 * @return bool True if the meta key was successfully registered, false if not.
 */
function register_post_meta( $post_type, $meta_key, array $args ) {
	$args['object_subtype'] = $post_type;

	return register_meta( 'post', $meta_key, $args );
}

/**
 * Unregisters a meta key for posts.
 *
 * @since 4.9.8
 *
 * @param string $post_type Post type the meta key is currently registered for. Pass
 *                          an empty string if the meta key is registered across all
 *                          existing post types.
 * @param string $meta_key  The meta key to unregister.
 * @return bool True on success, false if the meta key was not previously registered.
 */
function unregister_post_meta( $post_type, $meta_key ) {
	return unregister_meta_key( 'post', $meta_key, $post_type );
}

/**
 * Retrieve post meta fields, based on post ID.
 *
 * The post meta fields are retrieved from the cache where possible,
 * so the function is optimized to be called more than once.
 *
 * @since 1.2.0
 *
 * @param int $post_id Optional. Post ID. Default is ID of the global $post.
 * @return array Post meta for the given post.
 */
function get_post_custom( $post_id = 0 ) {
	$post_id = absint( $post_id );
	if ( ! $post_id )
		$post_id = get_the_ID();

	return get_post_meta( $post_id );
}

/**
 * Retrieve meta field names for a post.
 *
 * If there are no meta fields, then nothing (null) will be returned.
 *
 * @since 1.2.0
 *
 * @param int $post_id Optional. Post ID. Default is ID of the global $post.
 * @return array|void Array of the keys, if retrieved.
 */
function get_post_custom_keys( $post_id = 0 ) {
	$custom = get_post_custom( $post_id );

	if ( !is_array($custom) )
		return;

	if ( $keys = array_keys($custom) )
		return $keys;
}

/**
 * Retrieve values for a custom post field.
 *
 * The parameters must not be considered optional. All of the post meta fields
 * will be retrieved and only the meta field key values returned.
 *
 * @since 1.2.0
 *
 * @param string $key     Optional. Meta field key. Default empty.
 * @param int    $post_id Optional. Post ID. Default is ID of the global $post.
 * @return array|null Meta field values.
 */
function get_post_custom_values( $key = '', $post_id = 0 ) {
	if ( !$key )
		return null;

	$custom = get_post_custom($post_id);

	return isset($custom[$key]) ? $custom[$key] : null;
}

/**
 * Determines whether a post is sticky.
 *
 * Sticky posts should remain at the top of The Loop. If the post ID is not
 * given, then The Loop ID for the current post will be used.
 * 
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
 * Conditional Tags} article in the Theme Developer Handbook.
 * 
 * @since 2.7.0
 *
 * @param int $post_id Optional. Post ID. Default is ID of the global $post.
 * @return bool Whether post is sticky.
 */
function is_sticky( $post_id = 0 ) {
	$post_id = absint( $post_id );

	if ( ! $post_id )
		$post_id = get_the_ID();

	$stickies = get_option( 'sticky_posts' );

	if ( ! is_array( $stickies ) )
		return false;

	if ( in_array( $post_id, $stickies ) )
		return true;

	return false;
}

/**
 * Sanitize every post field.
 *
 * If the context is 'raw', then the post object or array will get minimal
 * sanitization of the integer fields.
 *
 * @since 2.3.0
 *
 * @see sanitize_post_field()
 *
 * @param object|WP_Post|array $post    The Post Object or Array
 * @param string               $context Optional. How to sanitize post fields.
 *                                      Accepts 'raw', 'edit', 'db', or 'display'.
 *                                      Default 'display'.
 * @return object|WP_Post|array The now sanitized Post Object or Array (will be the
 *                              same type as $post).
 */
function sanitize_post( $post, $context = 'display' ) {
	if ( is_object($post) ) {
		// Check if post already filtered for this context.
		if ( isset($post->filter) && $context == $post->filter )
			return $post;
		if ( !isset($post->ID) )
			$post->ID = 0;
		foreach ( array_keys(get_object_vars($post)) as $field )
			$post->$field = sanitize_post_field($field, $post->$field, $post->ID, $context);
		$post->filter = $context;
	} elseif ( is_array( $post ) ) {
		// Check if post already filtered for this context.
		if ( isset($post['filter']) && $context == $post['filter'] )
			return $post;
		if ( !isset($post['ID']) )
			$post['ID'] = 0;
		foreach ( array_keys($post) as $field )
			$post[$field] = sanitize_post_field($field, $post[$field], $post['ID'], $context);
		$post['filter'] = $context;
	}
	return $post;
}

/**
 * Sanitize post field based on context.
 *
 * Possible context values are:  'raw', 'edit', 'db', 'display', 'attribute' and
 * 'js'. The 'display' context is used by default. 'attribute' and 'js' contexts
 * are treated like 'display' when calling filters.
 *
 * @since 2.3.0
 * @since 4.4.0 Like `sanitize_post()`, `$context` defaults to 'display'.
 *
 * @param string $field   The Post Object field name.
 * @param mixed  $value   The Post Object value.
 * @param int    $post_id Post ID.
 * @param string $context Optional. How to sanitize post fields. Looks for 'raw', 'edit',
 *                        'db', 'display', 'attribute' and 'js'. Default 'display'.
 * @return mixed Sanitized value.
 */
function sanitize_post_field( $field, $value, $post_id, $context = 'display' ) {
	$int_fields = array('ID', 'post_parent', 'menu_order');
	if ( in_array($field, $int_fields) )
		$value = (int) $value;

	// Fields which contain arrays of integers.
	$array_int_fields = array( 'ancestors' );
	if ( in_array($field, $array_int_fields) ) {
		$value = array_map( 'absint', $value);
		return $value;
	}

	if ( 'raw' == $context )
		return $value;

	$prefixed = false;
	if ( false !== strpos($field, 'post_') ) {
		$prefixed = true;
		$field_no_prefix = str_replace('post_', '', $field);
	}

	if ( 'edit' == $context ) {
		$format_to_edit = array('post_content', 'post_excerpt', 'post_title', 'post_password');

		if ( $prefixed ) {

			/**
			 * Filters the value of a specific post field to edit.
			 *
			 * The dynamic portion of the hook name, `$field`, refers to the post
			 * field name.
			 *
			 * @since 2.3.0
			 *
			 * @param mixed $value   Value of the post field.
			 * @param int   $post_id Post ID.
			 */
			$value = apply_filters( "edit_{$field}", $value, $post_id );

			/**
			 * Filters the value of a specific post field to edit.
			 *
			 * The dynamic portion of the hook name, `$field_no_prefix`, refers to
			 * the post field name.
			 *
			 * @since 2.3.0
			 *
			 * @param mixed $value   Value of the post field.
			 * @param int   $post_id Post ID.
			 */
			$value = apply_filters( "{$field_no_prefix}_edit_pre", $value, $post_id );
		} else {
			$value = apply_filters( "edit_post_{$field}", $value, $post_id );
		}

		if ( in_array($field, $format_to_edit) ) {
			if ( 'post_content' == $field )
				$value = format_to_edit($value, user_can_richedit());
			else
				$value = format_to_edit($value);
		} else {
			$value = esc_attr($value);
		}
	} elseif ( 'db' == $context ) {
		if ( $prefixed ) {

			/**
			 * Filters the value of a specific post field before saving.
			 *
			 * The dynamic portion of the hook name, `$field`, refers to the post
			 * field name.
			 *
			 * @since 2.3.0
			 *
			 * @param mixed $value Value of the post field.
			 */
			$value = apply_filters( "pre_{$field}", $value );

			/**
			 * Filters the value of a specific field before saving.
			 *
			 * The dynamic portion of the hook name, `$field_no_prefix`, refers
			 * to the post field name.
			 *
			 * @since 2.3.0
			 *
			 * @param mixed $value Value of the post field.
			 */
			$value = apply_filters( "{$field_no_prefix}_save_pre", $value );
		} else {
			$value = apply_filters( "pre_post_{$field}", $value );

			/**
			 * Filters the value of a specific post field before saving.
			 *
			 * The dynamic portion of the hook name, `$field`, refers to the post
			 * field name.
			 *
			 * @since 2.3.0
			 *
			 * @param mixed $value Value of the post field.
			 */
			$value = apply_filters( "{$field}_pre", $value );
		}
	} else {

		// Use display filters by default.
		if ( $prefixed ) {

			/**
			 * Filters the value of a specific post field for display.
			 *
			 * The dynamic portion of the hook name, `$field`, refers to the post
			 * field name.
			 *
			 * @since 2.3.0
			 *
			 * @param mixed  $value   Value of the prefixed post field.
			 * @param int    $post_id Post ID.
			 * @param string $context Context for how to sanitize the field. Possible
			 *                        values include 'raw', 'edit', 'db', 'display',
			 *                        'attribute' and 'js'.
			 */
			$value = apply_filters( "{$field}", $value, $post_id, $context );
		} else {
			$value = apply_filters( "post_{$field}", $value, $post_id, $context );
		}

		if ( 'attribute' == $context ) {
			$value = esc_attr( $value );
		} elseif ( 'js' == $context ) {
			$value = esc_js( $value );
		}
	}

	return $value;
}

/**
 * Make a post sticky.
 *
 * Sticky posts should be displayed at the top of the front page.
 *
 * @since 2.7.0
 *
 * @param int $post_id Post ID.
 */
function stick_post( $post_id ) {
	$stickies = get_option('sticky_posts');

	if ( !is_array($stickies) )
		$stickies = array($post_id);

	if ( ! in_array($post_id, $stickies) )
		$stickies[] = $post_id;

	$updated = update_option( 'sticky_posts', $stickies );

	if ( $updated ) {
		/**
		 * Fires once a post has been added to the sticky list.
		 *
		 * @since 4.6.0
		 *
		 * @param int $post_id ID of the post that was stuck.
		 */
		do_action( 'post_stuck', $post_id );
	}
}

/**
 * Un-stick a post.
 *
 * Sticky posts should be displayed at the top of the front page.
 *
 * @since 2.7.0
 *
 * @param int $post_id Post ID.
 */
function unstick_post( $post_id ) {
	$stickies = get_option('sticky_posts');

	if ( !is_array($stickies) )
		return;

	if ( ! in_array($post_id, $stickies) )
		return;

	$offset = array_search($post_id, $stickies);
	if ( false === $offset )
		return;

	array_splice($stickies, $offset, 1);

	$updated = update_option( 'sticky_posts', $stickies );

	if ( $updated ) {
		/**
		 * Fires once a post has been removed from the sticky list.
		 *
		 * @since 4.6.0
		 *
		 * @param int $post_id ID of the post that was unstuck.
		 */
		do_action( 'post_unstuck', $post_id );
	}
}

/**
 * Return the cache key for wp_count_posts() based on the passed arguments.
 *
 * @since 3.9.0
 *
 * @param string $type Optional. Post type to retrieve count Default 'post'.
 * @param string $perm Optional. 'readable' or empty. Default empty.
 * @return string The cache key.
 */
function _count_posts_cache_key( $type = 'post', $perm = '' ) {
	$cache_key = 'posts-' . $type;
	if ( 'readable' == $perm && is_user_logged_in() ) {
		$post_type_object = get_post_type_object( $type );
		if ( $post_type_object && ! current_user_can( $post_type_object->cap->read_private_posts ) ) {
			$cache_key .= '_' . $perm . '_' . get_current_user_id();
		}
	}
	return $cache_key;
}

/**
 * Count number of posts of a post type and if user has permissions to view.
 *
 * This function provides an efficient method of finding the amount of post's
 * type a blog has. Another method is to count the amount of items in
 * get_posts(), but that method has a lot of overhead with doing so. Therefore,
 * when developing for 2.5+, use this function instead.
 *
 * The $perm parameter checks for 'readable' value and if the user can read
 * private posts, it will display that for the user that is signed in.
 *
 * @since 2.5.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $type Optional. Post type to retrieve count. Default 'post'.
 * @param string $perm Optional. 'readable' or empty. Default empty.
 * @return object Number of posts for each status.
 */
function wp_count_posts( $type = 'post', $perm = '' ) {
	global $wpdb;

	if ( ! post_type_exists( $type ) )
		return new stdClass;

	$cache_key = _count_posts_cache_key( $type, $perm );

	$counts = wp_cache_get( $cache_key, 'counts' );
	if ( false !== $counts ) {
		/** This filter is documented in wp-includes/post.php */
		return apply_filters( 'wp_count_posts', $counts, $type, $perm );
	}

	$query = "SELECT post_status, COUNT( * ) AS num_posts FROM {$wpdb->posts} WHERE post_type = %s";
	if ( 'readable' == $perm && is_user_logged_in() ) {
		$post_type_object = get_post_type_object($type);
		if ( ! current_user_can( $post_type_object->cap->read_private_posts ) ) {
			$query .= $wpdb->prepare( " AND (post_status != 'private' OR ( post_author = %d AND post_status = 'private' ))",
				get_current_user_id()
			);
		}
	}
	$query .= ' GROUP BY post_status';

	$results = (array) $wpdb->get_results( $wpdb->prepare( $query, $type ), ARRAY_A );
	$counts = array_fill_keys( get_post_stati(), 0 );

	foreach ( $results as $row ) {
		$counts[ $row['post_status'] ] = $row['num_posts'];
	}

	$counts = (object) $counts;
	wp_cache_set( $cache_key, $counts, 'counts' );

	/**
	 * Modify returned post counts by status for the current post type.
	 *
	 * @since 3.7.0
	 *
	 * @param object $counts An object containing the current post_type's post
	 *                       counts by status.
	 * @param string $type   Post type.
	 * @param string $perm   The permission to determine if the posts are 'readable'
	 *                       by the current user.
	 */
	return apply_filters( 'wp_count_posts', $counts, $type, $perm );
}

/**
 * Count number of attachments for the mime type(s).
 *
 * If you set the optional mime_type parameter, then an array will still be
 * returned, but will only have the item you are looking for. It does not give
 * you the number of attachments that are children of a post. You can get that
 * by counting the number of children that post has.
 *
 * @since 2.5.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string|array $mime_type Optional. Array or comma-separated list of
 *                                MIME patterns. Default empty.
 * @return object An object containing the attachment counts by mime type.
 */
function wp_count_attachments( $mime_type = '' ) {
	global $wpdb;

	$and = wp_post_mime_type_where( $mime_type );
	$count = $wpdb->get_results( "SELECT post_mime_type, COUNT( * ) AS num_posts FROM $wpdb->posts WHERE post_type = 'attachment' AND post_status != 'trash' $and GROUP BY post_mime_type", ARRAY_A );

	$counts = array();
	foreach ( (array) $count as $row ) {
		$counts[ $row['post_mime_type'] ] = $row['num_posts'];
	}
	$counts['trash'] = $wpdb->get_var( "SELECT COUNT( * ) FROM $wpdb->posts WHERE post_type = 'attachment' AND post_status = 'trash' $and");

	/**
	 * Modify returned attachment counts by mime type.
	 *
	 * @since 3.7.0
	 *
	 * @param object $counts    An object containing the attachment counts by
	 *                          mime type.
	 * @param string $mime_type The mime type pattern used to filter the attachments
	 *                          counted.
	 */
	return apply_filters( 'wp_count_attachments', (object) $counts, $mime_type );
}

/**
 * Get default post mime types.
 *
 * @since 2.9.0
 *
 * @return array List of post mime types.
 */
function get_post_mime_types() {
	$post_mime_types = array(	//	array( adj, noun )
		'image' => array(__('Images'), __('Manage Images'), _n_noop('Image <span class="count">(%s)</span>', 'Images <span class="count">(%s)</span>')),
		'audio' => array(__('Audio'), __('Manage Audio'), _n_noop('Audio <span class="count">(%s)</span>', 'Audio <span class="count">(%s)</span>')),
		'video' => array(__('Video'), __('Manage Video'), _n_noop('Video <span class="count">(%s)</span>', 'Video <span class="count">(%s)</span>')),
	);

	/**
	 * Filters the default list of post mime types.
	 *
	 * @since 2.5.0
	 *
	 * @param array $post_mime_types Default list of post mime types.
	 */
	return apply_filters( 'post_mime_types', $post_mime_types );
}

/**
 * Check a MIME-Type against a list.
 *
 * If the wildcard_mime_types parameter is a string, it must be comma separated
 * list. If the real_mime_types is a string, it is also comma separated to
 * create the list.
 *
 * @since 2.5.0
 *
 * @param string|array $wildcard_mime_types Mime types, e.g. audio/mpeg or image (same as image/*)
 *                                          or flash (same as *flash*).
 * @param string|array $real_mime_types     Real post mime type values.
 * @return array array(wildcard=>array(real types)).
 */
function wp_match_mime_types( $wildcard_mime_types, $real_mime_types ) {
	$matches = array();
	if ( is_string( $wildcard_mime_types ) ) {
		$wildcard_mime_types = array_map( 'trim', explode( ',', $wildcard_mime_types ) );
	}
	if ( is_string( $real_mime_types ) ) {
		$real_mime_types = array_map( 'trim', explode( ',', $real_mime_types ) );
	}

	$patternses = array();
	$wild = '[-._a-z0-9]*';

	foreach ( (array) $wildcard_mime_types as $type ) {
		$mimes = array_map( 'trim', explode( ',', $type ) );
		foreach ( $mimes as $mime ) {
			$regex = str_replace( '__wildcard__', $wild, preg_quote( str_replace( '*', '__wildcard__', $mime ) ) );
			$patternses[][$type] = "^$regex$";
			if ( false === strpos( $mime, '/' ) ) {
				$patternses[][$type] = "^$regex/";
				$patternses[][$type] = $regex;
			}
		}
	}
	asort( $patternses );

	foreach ( $patternses as $patterns ) {
		foreach ( $patterns as $type => $pattern ) {
			foreach ( (array) $real_mime_types as $real ) {
				if ( preg_match( "#$pattern#", $real ) && ( empty( $matches[$type] ) || false === array_search( $real, $matches[$type] ) ) ) {
					$matches[$type][] = $real;
				}
			}
		}
	}
	return $matches;
}

/**
 * Convert MIME types into SQL.
 *
 * @since 2.5.0
 *
 * @param string|array $post_mime_types List of mime types or comma separated string
 *                                      of mime types.
 * @param string       $table_alias     Optional. Specify a table alias, if needed.
 *                                      Default empty.
 * @return string The SQL AND clause for mime searching.
 */
function wp_post_mime_type_where( $post_mime_types, $table_alias = '' ) {
	$where = '';
	$wildcards = array('', '%', '%/%');
	if ( is_string($post_mime_types) )
		$post_mime_types = array_map('trim', explode(',', $post_mime_types));

	$wheres = array();

	foreach ( (array) $post_mime_types as $mime_type ) {
		$mime_type = preg_replace('/\s/', '', $mime_type);
		$slashpos = strpos($mime_type, '/');
		if ( false !== $slashpos ) {
			$mime_group = preg_replace('/[^-*.a-zA-Z0-9]/', '', substr($mime_type, 0, $slashpos));
			$mime_subgroup = preg_replace('/[^-*.+a-zA-Z0-9]/', '', substr($mime_type, $slashpos + 1));
			if ( empty($mime_subgroup) )
				$mime_subgroup = '*';
			else
				$mime_subgroup = str_replace('/', '', $mime_subgroup);
			$mime_pattern = "$mime_group/$mime_subgroup";
		} else {
			$mime_pattern = preg_replace('/[^-*.a-zA-Z0-9]/', '', $mime_type);
			if ( false === strpos($mime_pattern, '*') )
				$mime_pattern .= '/*';
		}

		$mime_pattern = preg_replace('/\*+/', '%', $mime_pattern);

		if ( in_array( $mime_type, $wildcards ) )
			return '';

		if ( false !== strpos($mime_pattern, '%') )
			$wheres[] = empty($table_alias) ? "post_mime_type LIKE '$mime_pattern'" : "$table_alias.post_mime_type LIKE '$mime_pattern'";
		else
			$wheres[] = empty($table_alias) ? "post_mime_type = '$mime_pattern'" : "$table_alias.post_mime_type = '$mime_pattern'";
	}
	if ( !empty($wheres) )
		$where = ' AND (' . join(' OR ', $wheres) . ') ';
	return $where;
}

/**
 * Trash or delete a post or page.
 *
 * When the post and page is permanently deleted, everything that is tied to
 * it is deleted also. This includes comments, post meta fields, and terms
 * associated with the post.
 *
 * The post or page is moved to trash instead of permanently deleted unless
 * trash is disabled, item is already in the trash, or $force_delete is true.
 *
 * @since 1.0.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 * @see wp_delete_attachment()
 * @see wp_trash_post()
 *
 * @param int  $postid       Optional. Post ID. Default 0.
 * @param bool $force_delete Optional. Whether to bypass trash and force deletion.
 *                           Default false.
 * @return WP_Post|false|null Post data on success, false or null on failure.
 */
function wp_delete_post( $postid = 0, $force_delete = false ) {
	global $wpdb;

	$post = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->posts WHERE ID = %d", $postid ) );

	if ( ! $post ) {
		return $post;
	}

	$post = get_post( $post );

	if ( ! $force_delete && ( 'post' === $post->post_type || 'page' === $post->post_type ) && 'trash' !== get_post_status( $postid ) && EMPTY_TRASH_DAYS ) {
		return wp_trash_post( $postid );
	}

	if ( 'attachment' === $post->post_type ) {
		return wp_delete_attachment( $postid, $force_delete );
	}

	/**
	 * Filters whether a post deletion should take place.
	 *
	 * @since 4.4.0
	 *
	 * @param bool    $delete       Whether to go forward with deletion.
	 * @param WP_Post $post         Post object.
	 * @param bool    $force_delete Whether to bypass the trash.
	 */
	$check = apply_filters( 'pre_delete_post', null, $post, $force_delete );
	if ( null !== $check ) {
		return $check;
	}

	/**
	 * Fires before a post is deleted, at the start of wp_delete_post().
	 *
	 * @since 3.2.0
	 *
	 * @see wp_delete_post()
	 *
	 * @param int $postid Post ID.
	 */
	do_action( 'before_delete_post', $postid );

	delete_post_meta($postid,'_wp_trash_meta_status');
	delete_post_meta($postid,'_wp_trash_meta_time');

	wp_delete_object_term_relationships($postid, get_object_taxonomies($post->post_type));

	$parent_data = array( 'post_parent' => $post->post_parent );
	$parent_where = array( 'post_parent' => $postid );

	if ( is_post_type_hierarchical( $post->post_type ) ) {
		// Point children of this page to its parent, also clean the cache of affected children.
		$children_query = $wpdb->prepare( "SELECT * FROM $wpdb->posts WHERE post_parent = %d AND post_type = %s", $postid, $post->post_type );
		$children = $wpdb->get_results( $children_query );
		if ( $children ) {
			$wpdb->update( $wpdb->posts, $parent_data, $parent_where + array( 'post_type' => $post->post_type ) );
		}
	}

	// Do raw query. wp_get_post_revisions() is filtered.
	$revision_ids = $wpdb->get_col( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE post_parent = %d AND post_type = 'revision'", $postid ) );
	// Use wp_delete_post (via wp_delete_post_revision) again. Ensures any meta/misplaced data gets cleaned up.
	foreach ( $revision_ids as $revision_id )
		wp_delete_post_revision( $revision_id );

	// Point all attachments to this post up one level.
	$wpdb->update( $wpdb->posts, $parent_data, $parent_where + array( 'post_type' => 'attachment' ) );

	wp_defer_comment_counting( true );

	$comment_ids = $wpdb->get_col( $wpdb->prepare( "SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = %d", $postid ));
	foreach ( $comment_ids as $comment_id ) {
		wp_delete_comment( $comment_id, true );
	}

	wp_defer_comment_counting( false );

	$post_meta_ids = $wpdb->get_col( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE post_id = %d ", $postid ));
	foreach ( $post_meta_ids as $mid )
		delete_metadata_by_mid( 'post', $mid );

	/**
	 * Fires immediately before a post is deleted from the database.
	 *
	 * @since 1.2.0
	 *
	 * @param int $postid Post ID.
	 */
	do_action( 'delete_post', $postid );
	$result = $wpdb->delete( $wpdb->posts, array( 'ID' => $postid ) );
	if ( ! $result ) {
		return false;
	}

	/**
	 * Fires immediately after a post is deleted from the database.
	 *
	 * @since 2.2.0
	 *
	 * @param int $postid Post ID.
	 */
	do_action( 'deleted_post', $postid );

	clean_post_cache( $post );

	if ( is_post_type_hierarchical( $post->post_type ) && $children ) {
		foreach ( $children as $child )
			clean_post_cache( $child );
	}

	wp_clear_scheduled_hook('publish_future_post', array( $postid ) );

	/**
	 * Fires after a post is deleted, at the conclusion of wp_delete_post().
	 *
	 * @since 3.2.0
	 *
	 * @see wp_delete_post()
	 *
	 * @param int $postid Post ID.
	 */
	do_action( 'after_delete_post', $postid );

	return $post;
}

/**
 * Reset the page_on_front, show_on_front, and page_for_post settings when
 * a linked page is deleted or trashed.
 *
 * Also ensures the post is no longer sticky.
 *
 * @since 3.7.0
 * @access private
 *
 * @param int $post_id Post ID.
 */
function _reset_front_page_settings_for_post( $post_id ) {
	$post = get_post( $post_id );
	if ( 'page' == $post->post_type ) {
	 	/*
	 	 * If the page is defined in option page_on_front or post_for_posts,
	 	 * adjust the corresponding options.
	 	 */
		if ( get_option( 'page_on_front' ) == $post->ID ) {
			update_option( 'show_on_front', 'posts' );
			update_option( 'page_on_front', 0 );
		}
		if ( get_option( 'page_for_posts' ) == $post->ID ) {
			delete_option( 'page_for_posts', 0 );
		}
	}
	unstick_post( $post->ID );
}

/**
 * Move a post or page to the Trash
 *
 * If trash is disabled, the post or page is permanently deleted.
 *
 * @since 2.9.0
 *
 * @see wp_delete_post()
 *
 * @param int $post_id Optional. Post ID. Default is ID of the global $post
 *                     if EMPTY_TRASH_DAYS equals true.
 * @return WP_Post|false|null Post data on success, false or null on failure.
 */
function wp_trash_post( $post_id = 0 ) {
	if ( ! EMPTY_TRASH_DAYS ) {
		return wp_delete_post( $post_id, true );
	}

	$post = get_post( $post_id );

	if ( ! $post ) {
		return $post;
	}

	if ( 'trash' === $post->post_status ) {
		return false;
	}

	/**
	 * Filters whether a post trashing should take place.
	 *
	 * @since 4.9.0
	 *
	 * @param bool    $trash Whether to go forward with trashing.
	 * @param WP_Post $post  Post object.
	 */
	$check = apply_filters( 'pre_trash_post', null, $post );
	if ( null !== $check ) {
		return $check;
	}

	/**
	 * Fires before a post is sent to the trash.
	 *
	 * @since 3.3.0
	 *
	 * @param int $post_id Post ID.
	 */
	do_action( 'wp_trash_post', $post_id );

	add_post_meta( $post_id, '_wp_trash_meta_status', $post->post_status );
	add_post_meta( $post_id, '_wp_trash_meta_time', time() );

	wp_update_post( array( 'ID' => $post_id, 'post_status' => 'trash' ) );

	wp_trash_post_comments( $post_id );

	/**
	 * Fires after a post is sent to the trash.
	 *
	 * @since 2.9.0
	 *
	 * @param int $post_id Post ID.
	 */
	do_action( 'trashed_post', $post_id );

	return $post;
}

/**
 * Restore a post or page from the Trash.
 *
 * @since 2.9.0
 *
 * @param int $post_id Optional. Post ID. Default is ID of the global $post.
 * @return WP_Post|false|null Post data on success, false or null on failure.
 */
function wp_untrash_post( $post_id = 0 ) {
	$post = get_post( $post_id );

	if ( ! $post ) {
		return $post;
	}

	if ( 'trash' !== $post->post_status ) {
		return false;
	}

	/**
	 * Filters whether a post untrashing should take place.
	 *
	 * @since 4.9.0
	 *
	 * @param bool    $untrash Whether to go forward with untrashing.
	 * @param WP_Post $post    Post object.
	 */
	$check = apply_filters( 'pre_untrash_post', null, $post );
	if ( null !== $check ) {
		return $check;
	}

	/**
	 * Fires before a post is restored from the trash.
	 *
	 * @since 2.9.0
	 *
	 * @param int $post_id Post ID.
	 */
	do_action( 'untrash_post', $post_id );

	$post_status = get_post_meta( $post_id, '_wp_trash_meta_status', true );

	delete_post_meta( $post_id, '_wp_trash_meta_status' );
	delete_post_meta( $post_id, '_wp_trash_meta_time' );

	wp_update_post( array( 'ID' => $post_id, 'post_status' => $post_status ) );

	wp_untrash_post_comments( $post_id );

	/**
	 * Fires after a post is restored from the trash.
	 *
	 * @since 2.9.0
	 *
	 * @param int $post_id Post ID.
	 */
	do_action( 'untrashed_post', $post_id );

	return $post;
}

/**
 * Moves comments for a post to the trash.
 *
 * @since 2.9.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int|WP_Post|null $post Optional. Post ID or post object. Defaults to global $post.
 * @return mixed|void False on failure.
 */
function wp_trash_post_comments( $post = null ) {
	global $wpdb;

	$post = get_post($post);
	if ( empty($post) )
		return;

	$post_id = $post->ID;

	/**
	 * Fires before comments are sent to the trash.
	 *
	 * @since 2.9.0
	 *
	 * @param int $post_id Post ID.
	 */
	do_action( 'trash_post_comments', $post_id );

	$comments = $wpdb->get_results( $wpdb->prepare("SELECT comment_ID, comment_approved FROM $wpdb->comments WHERE comment_post_ID = %d", $post_id) );
	if ( empty($comments) )
		return;

	// Cache current status for each comment.
	$statuses = array();
	foreach ( $comments as $comment )
		$statuses[$comment->comment_ID] = $comment->comment_approved;
	add_post_meta($post_id, '_wp_trash_meta_comments_status', $statuses);

	// Set status for all comments to post-trashed.
	$result = $wpdb->update($wpdb->comments, array('comment_approved' => 'post-trashed'), array('comment_post_ID' => $post_id));

	clean_comment_cache( array_keys($statuses) );

	/**
	 * Fires after comments are sent to the trash.
	 *
	 * @since 2.9.0
	 *
	 * @param int   $post_id  Post ID.
	 * @param array $statuses Array of comment statuses.
	 */
	do_action( 'trashed_post_comments', $post_id, $statuses );

	return $result;
}

/**
 * Restore comments for a post from the trash.
 *
 * @since 2.9.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int|WP_Post|null $post Optional. Post ID or post object. Defaults to global $post.
 * @return true|void
 */
function wp_untrash_post_comments( $post = null ) {
	global $wpdb;

	$post = get_post($post);
	if ( empty($post) )
		return;

	$post_id = $post->ID;

	$statuses = get_post_meta($post_id, '_wp_trash_meta_comments_status', true);

	if ( empty($statuses) )
		return true;

	/**
	 * Fires before comments are restored for a post from the trash.
	 *
	 * @since 2.9.0
	 *
	 * @param int $post_id Post ID.
	 */
	do_action( 'untrash_post_comments', $post_id );

	// Restore each comment to its original status.
	$group_by_status = array();
	foreach ( $statuses as $comment_id => $comment_status )
		$group_by_status[$comment_status][] = $comment_id;

	foreach ( $group_by_status as $status => $comments ) {
		// Sanity check. This shouldn't happen.
		if ( 'post-trashed' == $status ) {
			$status = '0';
		}
		$comments_in = implode( ', ', array_map( 'intval', $comments ) );
		$wpdb->query( $wpdb->prepare( "UPDATE $wpdb->comments SET comment_approved = %s WHERE comment_ID IN ($comments_in)", $status ) );
	}

	clean_comment_cache( array_keys($statuses) );

	delete_post_meta($post_id, '_wp_trash_meta_comments_status');

	/**
	 * Fires after comments are restored for a post from the trash.
	 *
	 * @since 2.9.0
	 *
	 * @param int $post_id Post ID.
	 */
	do_action( 'untrashed_post_comments', $post_id );
}

/**
 * Retrieve the list of categories for a post.
 *
 * Compatibility layer for themes and plugins. Also an easy layer of abstraction
 * away from the complexity of the taxonomy layer.
 *
 * @since 2.1.0
 *
 * @see wp_get_object_terms()
 *
 * @param int   $post_id Optional. The Post ID. Does not default to the ID of the
 *                       global $post. Default 0.
 * @param array $args    Optional. Category query parameters. Default empty array.
 *                       See WP_Term_Query::__construct() for supported arguments.
 * @return array|WP_Error List of categories. If the `$fields` argument passed via `$args` is 'all' or
 *                        'all_with_object_id', an array of WP_Term objects will be returned. If `$fields`
 *                        is 'ids', an array of category ids. If `$fields` is 'names', an array of category names.
 *                        WP_Error object if 'category' taxonomy doesn't exist.
 */
function wp_get_post_categories( $post_id = 0, $args = array() ) {
	$post_id = (int) $post_id;

	$defaults = array('fields' => 'ids');
	$args = wp_parse_args( $args, $defaults );

	$cats = wp_get_object_terms($post_id, 'category', $args);
	return $cats;
}

/**
 * Retrieve the tags for a post.
 *
 * There is only one default for this function, called 'fields' and by default
 * is set to 'all'. There are other defaults that can be overridden in
 * wp_get_object_terms().
 *
 * @since 2.3.0
 *
 * @param int   $post_id Optional. The Post ID. Does not default to the ID of the
 *                       global $post. Default 0.
 * @param array $args    Optional. Tag query parameters. Default empty array.
 *                       See WP_Term_Query::__construct() for supported arguments.
 * @return array|WP_Error Array of WP_Term objects on success or empty array if no tags were found.
 *                        WP_Error object if 'post_tag' taxonomy doesn't exist.
 */
function wp_get_post_tags( $post_id = 0, $args = array() ) {
	return wp_get_post_terms( $post_id, 'post_tag', $args);
}

/**
 * Retrieves the terms for a post.
 *
 * @since 2.8.0
 *
 * @param int          $post_id  Optional. The Post ID. Does not default to the ID of the
 *                               global $post. Default 0.
 * @param string|array $taxonomy Optional. The taxonomy slug or array of slugs for which
 *                               to retrieve terms. Default 'post_tag'.
 * @param array        $args     {
 *     Optional. Term query parameters. See WP_Term_Query::__construct() for supported arguments.
 *
 *     @type string $fields Term fields to retrieve. Default 'all'.
 * }
 * @return array|WP_Error Array of WP_Term objects on success or empty array if no terms were found.
 *                        WP_Error object if `$taxonomy` doesn't exist.
 */
function wp_get_post_terms( $post_id = 0, $taxonomy = 'post_tag', $args = array() ) {
	$post_id = (int) $post_id;

	$defaults = array('fields' => 'all');
	$args = wp_parse_args( $args, $defaults );

	$tags = wp_get_object_terms($post_id, $taxonomy, $args);

	return $tags;
}

/**
 * Retrieve a number of recent posts.
 *
 * @since 1.0.0
 *
 * @see get_posts()
 *
 * @param array  $args   Optional. Arguments to retrieve posts. Default empty array.
 * @param string $output Optional. The required return type. One of OBJECT or ARRAY_A, which correspond to
 *                       a WP_Post object or an associative array, respectively. Default ARRAY_A.
 * @return array|false Array of recent posts, where the type of each element is determined by $output parameter.
 *                     Empty array on failure.
 */
function wp_get_recent_posts( $args = array(), $output = ARRAY_A ) {

	if ( is_numeric( $args ) ) {
		_deprecated_argument( __FUNCTION__, '3.1.0', __( 'Passing an integer number of posts is deprecated. Pass an array of arguments instead.' ) );
		$args = array( 'numberposts' => absint( $args ) );
	}

	// Set default arguments.
	$defaults = array(
		'numberposts' => 10, 'offset' => 0,
		'category' => 0, 'orderby' => 'post_date',
		'order' => 'DESC', 'include' => '',
		'exclude' => '', 'meta_key' => '',
		'meta_value' =>'', 'post_type' => 'post', 'post_status' => 'draft, publish, future, pending, private',
		'suppress_filters' => true
	);

	$r = wp_parse_args( $args, $defaults );

	$results = get_posts( $r );

	// Backward compatibility. Prior to 3.1 expected posts to be returned in array.
	if ( ARRAY_A == $output ){
		foreach ( $results as $key => $result ) {
			$results[$key] = get_object_vars( $result );
		}
		return $results ? $results : array();
	}

	return $results ? $results : false;

}

/**
 * Insert or update a post.
 *
 * If the $postarr parameter has 'ID' set to a value, then post will be updated.
 *
 * You can set the post date manually, by setting the values for 'post_date'
 * and 'post_date_gmt' keys. You can close the comments or open the comments by
 * setting the value for 'comment_status' key.
 *
 * @since 1.0.0
 * @since 4.2.0 Support was added for encoding emoji in the post title, content, and excerpt.
 * @since 4.4.0 A 'meta_input' array can now be passed to `$postarr` to add post meta data.
 *
 * @see sanitize_post()
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param array $postarr {
 *     An array of elements that make up a post to update or insert.
 *
 *     @type int    $ID                    The post ID. If equal to something other than 0,
 *                                         the post with that ID will be updated. Default 0.
 *     @type int    $post_author           The ID of the user who added the post. Default is
 *                                         the current user ID.
 *     @type string $post_date             The date of the post. Default is the current time.
 *     @type string $post_date_gmt         The date of the post in the GMT timezone. Default is
 *                                         the value of `$post_date`.
 *     @type mixed  $post_content          The post content. Default empty.
 *     @type string $post_content_filtered The filtered post content. Default empty.
 *     @type string $post_title            The post title. Default empty.
 *     @type string $post_excerpt          The post excerpt. Default empty.
 *     @type string $post_status           The post status. Default 'draft'.
 *     @type string $post_type             The post type. Default 'post'.
 *     @type string $comment_status        Whether the post can accept comments. Accepts 'open' or 'closed'.
 *                                         Default is the value of 'default_comment_status' option.
 *     @type string $ping_status           Whether the post can accept pings. Accepts 'open' or 'closed'.
 *                                         Default is the value of 'default_ping_status' option.
 *     @type string $post_password         The password to access the post. Default empty.
 *     @type string $post_name             The post name. Default is the sanitized post title
 *                                         when creating a new post.
 *     @type string $to_ping               Space or carriage return-separated list of URLs to ping.
 *                                         Default empty.
 *     @type string $pinged                Space or carriage return-separated list of URLs that have
 *                                         been pinged. Default empty.
 *     @type string $post_modified         The date when the post was last modified. Default is
 *                                         the current time.
 *     @type string $post_modified_gmt     The date when the post was last modified in the GMT
 *                                         timezone. Default is the current time.
 *     @type int    $post_parent           Set this for the post it belongs to, if any. Default 0.
 *     @type int    $menu_order            The order the post should be displayed in. Default 0.
 *     @type string $post_mime_type        The mime type of the post. Default empty.
 *     @type string $guid                  Global Unique ID for referencing the post. Default empty.
 *     @type array  $post_category         Array of category names, slugs, or IDs.
 *                                         Defaults to value of the 'default_category' option.
 *     @type array  $tags_input            Array of tag names, slugs, or IDs. Default empty.
 *     @type array  $tax_input             Array of taxonomy terms keyed by their taxonomy name. Default empty.
 *     @type array  $meta_input            Array of post meta values keyed by their post meta key. Default empty.
 * }
 * @param bool  $wp_error Optional. Whether to return a WP_Error on failure. Default false.
 * @return int|WP_Error The post ID on success. The value 0 or WP_Error on failure.
 */
function wp_insert_post( $postarr, $wp_error = false ) {
	global $wpdb;

	$user_id = get_current_user_id();

	$defaults = array(
		'post_author' => $user_id,
		'post_content' => '',
		'post_content_filtered' => '',
		'post_title' => '',
		'post_excerpt' => '',
		'post_status' => 'draft',
		'post_type' => 'post',
		'comment_status' => '',
		'ping_status' => '',
		'post_password' => '',
		'to_ping' =>  '',
		'pinged' => '',
		'post_parent' => 0,
		'menu_order' => 0,
		'guid' => '',
		'import_id' => 0,
		'context' => '',
	);

	$postarr = wp_parse_args($postarr, $defaults);

	unset( $postarr[ 'filter' ] );

	$postarr = sanitize_post($postarr, 'db');

	// Are we updating or creating?
	$post_ID = 0;
	$update = false;
	$guid = $postarr['guid'];

	if ( ! empty( $postarr['ID'] ) ) {
		$update = true;

		// Get the post ID and GUID.
		$post_ID = $postarr['ID'];
		$post_before = get_post( $post_ID );
		if ( is_null( $post_before ) ) {
			if ( $wp_error ) {
				return new WP_Error( 'invalid_post', __( 'Invalid post ID.' ) );
			}
			return 0;
		}

		$guid = get_post_field( 'guid', $post_ID );
		$previous_status = get_post_field('post_status', $post_ID );
	} else {
		$previous_status = 'new';
	}

	$post_type = empty( $postarr['post_type'] ) ? 'post' : $postarr['post_type'];

	$post_title = $postarr['post_title'];
	$post_content = $postarr['post_content'];
	$post_excerpt = $postarr['post_excerpt'];
	if ( isset( $postarr['post_name'] ) ) {
		$post_name = $postarr['post_name'];
	} elseif ( $update ) {
		// For an update, don't modify the post_name if it wasn't supplied as an argument.
		$post_name = $post_before->post_name;
	}

	$maybe_empty = 'attachment' !== $post_type
		&& ! $post_content && ! $post_title && ! $post_excerpt
		&& post_type_supports( $post_type, 'editor' )
		&& post_type_supports( $post_type, 'title' )
		&& post_type_supports( $post_type, 'excerpt' );

	/**
	 * Filters whether the post should be considered "empty".
	 *
	 * The post is considered "empty" if both:
	 * 1. The post type supports the title, editor, and excerpt fields
	 * 2. The title, editor, and excerpt fields are all empty
	 *
	 * Returning a truthy value to the filter will effectively short-circuit
	 * the new post being inserted, returning 0. If $wp_error is true, a WP_Error
	 * will be returned instead.
	 *
	 * @since 3.3.0
	 *
	 * @param bool  $maybe_empty Whether the post should be considered "empty".
	 * @param array $postarr     Array of post data.
	 */
	if ( apply_filters( 'wp_insert_post_empty_content', $maybe_empty, $postarr ) ) {
		if ( $wp_error ) {
			return new WP_Error( 'empty_content', __( 'Content, title, and excerpt are empty.' ) );
		} else {
			return 0;
		}
	}

	$post_status = empty( $postarr['post_status'] ) ? 'draft' : $postarr['post_status'];
	if ( 'attachment' === $post_type && ! in_array( $post_status, array( 'inherit', 'private', 'trash', 'auto-draft' ), true ) ) {
		$post_status = 'inherit';
	}

	if ( ! empty( $postarr['post_category'] ) ) {
		// Filter out empty terms.
		$post_category = array_filter( $postarr['post_category'] );
	}

	// Make sure we set a valid category.
	if ( empty( $post_category ) || 0 == count( $post_category ) || ! is_array( $post_category ) ) {
		// 'post' requires at least one category.
		if ( 'post' == $post_type && 'auto-draft' != $post_status ) {
			$post_category = array( get_option('default_category') );
		} else {
			$post_category = array();
		}
	}

	// Don't allow contributors to set the post slug for pending review posts.
	if ( 'pending' == $post_status && !current_user_can( 'publish_posts' ) ) {
		$post_name = '';
	}

	/*
	 * Create a valid post name. Drafts and pending posts are allowed to have
	 * an empty post name.
	 */
	if ( empty($post_name) ) {
		if ( !in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ) ) ) {
			$post_name = sanitize_title($post_title);
		} else {
			$post_name = '';
		}
	} else {
		// On updates, we need to check to see if it's using the old, fixed sanitization context.
		$check_name = sanitize_title( $post_name, '', 'old-save' );
		if ( $update && strtolower( urlencode( $post_name ) ) == $check_name && get_post_field( 'post_name', $post_ID ) == $check_name ) {
			$post_name = $check_name;
		} else { // new post, or slug has changed.
			$post_name = sanitize_title($post_name);
		}
	}

	/*
	 * If the post date is empty (due to having been new or a draft) and status
	 * is not 'draft' or 'pending', set date to now.
	 */
	if ( empty( $postarr['post_date'] ) || '0000-00-00 00:00:00' == $postarr['post_date'] ) {
		if ( empty( $postarr['post_date_gmt'] ) || '0000-00-00 00:00:00' == $postarr['post_date_gmt'] ) {
			$post_date = current_time( 'mysql' );
		} else {
			$post_date = get_date_from_gmt( $postarr['post_date_gmt'] );
		}
	} else {
		$post_date = $postarr['post_date'];
	}

	// Validate the date.
	$mm = substr( $post_date, 5, 2 );
	$jj = substr( $post_date, 8, 2 );
	$aa = substr( $post_date, 0, 4 );
	$valid_date = wp_checkdate( $mm, $jj, $aa, $post_date );
	if ( ! $valid_date ) {
		if ( $wp_error ) {
			return new WP_Error( 'invalid_date', __( 'Invalid date.' ) );
		} else {
			return 0;
		}
	}

	if ( empty( $postarr['post_date_gmt'] ) || '0000-00-00 00:00:00' == $postarr['post_date_gmt'] ) {
		if ( ! in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ) ) ) {
			$post_date_gmt = get_gmt_from_date( $post_date );
		} else {
			$post_date_gmt = '0000-00-00 00:00:00';
		}
	} else {
		$post_date_gmt = $postarr['post_date_gmt'];
	}

	if ( $update || '0000-00-00 00:00:00' == $post_date ) {
		$post_modified     = current_time( 'mysql' );
		$post_modified_gmt = current_time( 'mysql', 1 );
	} else {
		$post_modified     = $post_date;
		$post_modified_gmt = $post_date_gmt;
	}

	if ( 'attachment' !== $post_type ) {
		if ( 'publish' == $post_status ) {
			$now = gmdate('Y-m-d H:i:59');
			if ( mysql2date('U', $post_date_gmt, false) > mysql2date('U', $now, false) ) {
				$post_status = 'future';
			}
		} elseif ( 'future' == $post_status ) {
			$now = gmdate('Y-m-d H:i:59');
			if ( mysql2date('U', $post_date_gmt, false) <= mysql2date('U', $now, false) ) {
				$post_status = 'publish';
			}
		}
	}

	// Comment status.
	if ( empty( $postarr['comment_status'] ) ) {
		if ( $update ) {
			$comment_status = 'closed';
		} else {
			$comment_status = get_default_comment_status( $post_type );
		}
	} else {
		$comment_status = $postarr['comment_status'];
	}

	// These variables are needed by compact() later.
	$post_content_filtered = $postarr['post_content_filtered'];
	$post_author = isset( $postarr['post_author'] ) ? $postarr['post_author'] : $user_id;
	$ping_status = empty( $postarr['ping_status'] ) ? get_default_comment_status( $post_type, 'pingback' ) : $postarr['ping_status'];
	$to_ping = isset( $postarr['to_ping'] ) ? sanitize_trackback_urls( $postarr['to_ping'] ) : '';
	$pinged = isset( $postarr['pinged'] ) ? $postarr['pinged'] : '';
	$import_id = isset( $postarr['import_id'] ) ? $postarr['import_id'] : 0;

	/*
	 * The 'wp_insert_post_parent' filter expects all variables to be present.
	 * Previously, these variables would have already been extracted
	 */
	if ( isset( $postarr['menu_order'] ) ) {
		$menu_order = (int) $postarr['menu_order'];
	} else {
		$menu_order = 0;
	}

	$post_password = isset( $postarr['post_password'] ) ? $postarr['post_password'] : '';
	if ( 'private' == $post_status ) {
		$post_password = '';
	}

	if ( isset( $postarr['post_parent'] ) ) {
		$post_parent = (int) $postarr['post_parent'];
	} else {
		$post_parent = 0;
	}

	$new_postarr = array_merge(
		array(
			'ID' => $post_ID,
		),
		compact( array_diff( array_keys( $defaults ), array( 'context', 'filter' ) ) )
	);

	/**
	 * Filters the post parent -- used to check for and prevent hierarchy loops.
	 *
	 * @since 3.1.0
	 *
	 * @param int   $post_parent Post parent ID.
	 * @param int   $post_ID     Post ID.
	 * @param array $new_postarr Array of parsed post data.
	 * @param array $postarr     Array of sanitized, but otherwise unmodified post data.
	 */
	$post_parent = apply_filters( 'wp_insert_post_parent', $post_parent, $post_ID, $new_postarr, $postarr );

	/*
	 * If the post is being untrashed and it has a desired slug stored in post meta,
	 * reassign it.
	 */
	if ( 'trash' === $previous_status && 'trash' !== $post_status ) {
		$desired_post_slug = get_post_meta( $post_ID, '_wp_desired_post_slug', true );
		if ( $desired_post_slug ) {
			delete_post_meta( $post_ID, '_wp_desired_post_slug' );
			$post_name = $desired_post_slug;
		}
	}

	// If a trashed post has the desired slug, change it and let this post have it.
	if ( 'trash' !== $post_status && $post_name ) {
		wp_add_trashed_suffix_to_post_name_for_trashed_posts( $post_name, $post_ID );
	}

	// When trashing an existing post, change its slug to allow non-trashed posts to use it.
	if ( 'trash' === $post_status && 'trash' !== $previous_status && 'new' !== $previous_status ) {
		$post_name = wp_add_trashed_suffix_to_post_name_for_post( $post_ID );
	}

	$post_name = wp_unique_post_slug( $post_name, $post_ID, $post_status, $post_type, $post_parent );

	// Don't unslash.
	$post_mime_type = isset( $postarr['post_mime_type'] ) ? $postarr['post_mime_type'] : '';

	// Expected_slashed (everything!).
	$data = compact( 'post_author', 'post_date', 'post_date_gmt', 'post_content', 'post_content_filtered', 'post_title', 'post_excerpt', 'post_status', 'post_type', 'comment_status', 'ping_status', 'post_password', 'post_name', 'to_ping', 'pinged', 'post_modified', 'post_modified_gmt', 'post_parent', 'menu_order', 'post_mime_type', 'guid' );

	$emoji_fields = array( 'post_title', 'post_content', 'post_excerpt' );

	foreach ( $emoji_fields as $emoji_field ) {
		if ( isset( $data[ $emoji_field ] ) ) {
			$charset = $wpdb->get_col_charset( $wpdb->posts, $emoji_field );
			if ( 'utf8' === $charset ) {
				$data[ $emoji_field ] = wp_encode_emoji( $data[ $emoji_field ] );
			}
		}
	}

	if ( 'attachment' === $post_type ) {
		/**
		 * Filters attachment post data before it is updated in or added to the database.
		 *
		 * @since 3.9.0
		 *
		 * @param array $data    An array of sanitized attachment post data.
		 * @param array $postarr An array of unsanitized attachment post data.
		 */
		$data = apply_filters( 'wp_insert_attachment_data', $data, $postarr );
	} else {
		/**
		 * Filters slashed post data just before it is inserted into the database.
		 *
		 * @since 2.7.0
		 *
		 * @param array $data    An array of slashed post data.
		 * @param array $postarr An array of sanitized, but otherwise unmodified post data.
		 */
		$data = apply_filters( 'wp_insert_post_data', $data, $postarr );
	}
	$data = wp_unslash( $data );
	$where = array( 'ID' => $post_ID );

	if ( $update ) {
		/**
		 * Fires immediately before an existing post is updated in the database.
		 *
		 * @since 2.5.0
		 *
		 * @param int   $post_ID Post ID.
		 * @param array $data    Array of unslashed post data.
		 */
		do_action( 'pre_post_update', $post_ID, $data );
		if ( false === $wpdb->update( $wpdb->posts, $data, $where ) ) {
			if ( $wp_error ) {
				return new WP_Error('db_update_error', __('Could not update post in the database'), $wpdb->last_error);
			} else {
				return 0;
			}
		}
	} else {
		// If there is a suggested ID, use it if not already present.
		if ( ! empty( $import_id ) ) {
			$import_id = (int) $import_id;
			if ( ! $wpdb->get_var( $wpdb->prepare("SELECT ID FROM $wpdb->posts WHERE ID = %d", $import_id) ) ) {
				$data['ID'] = $import_id;
			}
		}
		if ( false === $wpdb->insert( $wpdb->posts, $data ) ) {
			if ( $wp_error ) {
				return new WP_Error('db_insert_error', __('Could not insert post into the database'), $wpdb->last_error);
			} else {
				return 0;
			}
		}
		$post_ID = (int) $wpdb->insert_id;

		// Use the newly generated $post_ID.
		$where = array( 'ID' => $post_ID );
	}

	if ( empty( $data['post_name'] ) && ! in_array( $data['post_status'], array( 'draft', 'pending', 'auto-draft' ) ) ) {
		$data['post_name'] = wp_unique_post_slug( sanitize_title( $data['post_title'], $post_ID ), $post_ID, $data['post_status'], $post_type, $post_parent );
		$wpdb->update( $wpdb->posts, array( 'post_name' => $data['post_name'] ), $where );
		clean_post_cache( $post_ID );
	}

	if ( is_object_in_taxonomy( $post_type, 'category' ) ) {
		wp_set_post_categories( $post_ID, $post_category );
	}

	if ( isset( $postarr['tags_input'] ) && is_object_in_taxonomy( $post_type, 'post_tag' ) ) {
		wp_set_post_tags( $post_ID, $postarr['tags_input'] );
	}

	// New-style support for all custom taxonomies.
	if ( ! empty( $postarr['tax_input'] ) ) {
		foreach ( $postarr['tax_input'] as $taxonomy => $tags ) {
			$taxonomy_obj = get_taxonomy($taxonomy);
			if ( ! $taxonomy_obj ) {
				/* translators: %s: taxonomy name */
				_doing_it_wrong( __FUNCTION__, sprintf( __( 'Invalid taxonomy: %s.' ), $taxonomy ), '4.4.0' );
				continue;
			}

			// array = hierarchical, string = non-hierarchical.
			if ( is_array( $tags ) ) {
				$tags = array_filter($tags);
			}
			if ( current_user_can( $taxonomy_obj->cap->assign_terms ) ) {
				wp_set_post_terms( $post_ID, $tags, $taxonomy );
			}
		}
	}

	if ( ! empty( $postarr['meta_input'] ) ) {
		foreach ( $postarr['meta_input'] as $field => $value ) {
			update_post_meta( $post_ID, $field, $value );
		}
	}

	$current_guid = get_post_field( 'guid', $post_ID );

	// Set GUID.
	if ( ! $update && '' == $current_guid ) {
		$wpdb->update( $wpdb->posts, array( 'guid' => get_permalink( $post_ID ) ), $where );
	}

	if ( 'attachment' === $postarr['post_type'] ) {
		if ( ! empty( $postarr['file'] ) ) {
			update_attached_file( $post_ID, $postarr['file'] );
		}

		if ( ! empty( $postarr['context'] ) ) {
			add_post_meta( $post_ID, '_wp_attachment_context', $postarr['context'], true );
		}
	}

	// Set or remove featured image.
	if ( isset( $postarr['_thumbnail_id'] ) ) {
		$thumbnail_support = current_theme_supports( 'post-thumbnails', $post_type ) && post_type_supports( $post_type, 'thumbnail' ) || 'revision' === $post_type;
		if ( ! $thumbnail_support && 'attachment' === $post_type && $post_mime_type ) {
			if ( wp_attachment_is( 'audio', $post_ID ) ) {
				$thumbnail_support = post_type_supports( 'attachment:audio', 'thumbnail' ) || current_theme_supports( 'post-thumbnails', 'attachment:audio' );
			} elseif ( wp_attachment_is( 'video', $post_ID ) ) {
				$thumbnail_support = post_type_supports( 'attachment:video', 'thumbnail' ) || current_theme_supports( 'post-thumbnails', 'attachment:video' );
			}
		}

		if ( $thumbnail_support ) {
			$thumbnail_id = intval( $postarr['_thumbnail_id'] );
			if ( -1 === $thumbnail_id ) {
				delete_post_thumbnail( $post_ID );
			} else {
				set_post_thumbnail( $post_ID, $thumbnail_id );
			}
		}
	}

	clean_post_cache( $post_ID );

	$post = get_post( $post_ID );

	if ( ! empty( $postarr['page_template'] ) ) {
		$post->page_template = $postarr['page_template'];
		$page_templates = wp_get_theme()->get_page_templates( $post );
		if ( 'default' != $postarr['page_template'] && ! isset( $page_templates[ $postarr['page_template'] ] ) ) {
			if ( $wp_error ) {
				return new WP_Error( 'invalid_page_template', __( 'Invalid page template.' ) );
			}
			update_post_meta( $post_ID, '_wp_page_template', 'default' );
		} else {
			update_post_meta( $post_ID, '_wp_page_template', $postarr['page_template'] );
		}
	}

	if ( 'attachment' !== $postarr['post_type'] ) {
		wp_transition_post_status( $data['post_status'], $previous_status, $post );
	} else {
		if ( $update ) {
			/**
			 * Fires once an existing attachment has been updated.
			 *
			 * @since 2.0.0
			 *
			 * @param int $post_ID Attachment ID.
			 */
			do_action( 'edit_attachment', $post_ID );
			$post_after = get_post( $post_ID );

			/**
			 * Fires once an existing attachment has been updated.
			 *
			 * @since 4.4.0
			 *
			 * @param int     $post_ID      Post ID.
			 * @param WP_Post $post_after   Post object following the update.
			 * @param WP_Post $post_before  Post object before the update.
			 */
			do_action( 'attachment_updated', $post_ID, $post_after, $post_before );
		} else {

			/**
			 * Fires once an attachment has been added.
			 *
			 * @since 2.0.0
			 *
			 * @param int $post_ID Attachment ID.
			 */
			do_action( 'add_attachment', $post_ID );
		}

		return $post_ID;
	}

	if ( $update ) {
		/**
		 * Fires once an existing post has been updated.
		 *
		 * @since 1.2.0
		 *
		 * @param int     $post_ID Post ID.
		 * @param WP_Post $post    Post object.
		 */
		do_action( 'edit_post', $post_ID, $post );
		$post_after = get_post($post_ID);

		/**
		 * Fires once an existing post has been updated.
		 *
		 * @since 3.0.0
		 *
		 * @param int     $post_ID      Post ID.
		 * @param WP_Post $post_after   Post object following the update.
		 * @param WP_Post $post_before  Post object before the update.
		 */
		do_action( 'post_updated', $post_ID, $post_after, $post_before);
	}

	/**
	 * Fires once a post has been saved.
	 *
	 * The dynamic portion of the hook name, `$post->post_type`, refers to
	 * the post type slug.
	 *
	 * @since 3.7.0
	 *
	 * @param int     $post_ID Post ID.
	 * @param WP_Post $post    Post object.
	 * @param bool    $update  Whether this is an existing post being updated or not.
	 */
	do_action( "save_post_{$post->post_type}", $post_ID, $post, $update );

	/**
	 * Fires once a post has been saved.
	 *
	 * @since 1.5.0
	 *
	 * @param int     $post_ID Post ID.
	 * @param WP_Post $post    Post object.
	 * @param bool    $update  Whether this is an existing post being updated or not.
	 */
	do_action( 'save_post', $post_ID, $post, $update );

	/**
	 * Fires once a post has been saved.
	 *
	 * @since 2.0.0
	 *
	 * @param int     $post_ID Post ID.
	 * @param WP_Post $post    Post object.
	 * @param bool    $update  Whether this is an existing post being updated or not.
	 */
	do_action( 'wp_insert_post', $post_ID, $post, $update );

	return $post_ID;
}

/**
 * Update a post with new post data.
 *
 * The date does not have to be set for drafts. You can set the date and it will
 * not be overridden.
 *
 * @since 1.0.0
 *
 * @param array|object $postarr  Optional. Post data. Arrays are expected to be escaped,
 *                               objects are not. Default array.
 * @param bool         $wp_error Optional. Allow return of WP_Error on failure. Default false.
 * @return int|WP_Error The value 0 or WP_Error on failure. The post ID on success.
 */
function wp_update_post( $postarr = array(), $wp_error = false ) {
	if ( is_object($postarr) ) {
		// Non-escaped post was passed.
		$postarr = get_object_vars($postarr);
		$postarr = wp_slash($postarr);
	}

	// First, get all of the original fields.
	$post = get_post($postarr['ID'], ARRAY_A);

	if ( is_null( $post ) ) {
		if ( $wp_error )
			return new WP_Error( 'invalid_post', __( 'Invalid post ID.' ) );
		return 0;
	}

	// Escape data pulled from DB.
	$post = wp_slash($post);

	// Passed post category list overwrites existing category list if not empty.
	if ( isset($postarr['post_category']) && is_array($postarr['post_category'])
			 && 0 != count($postarr['post_category']) )
		$post_cats = $postarr['post_category'];
	else
		$post_cats = $post['post_category'];

	// Drafts shouldn't be assigned a date unless explicitly done so by the user.
	if ( isset( $post['post_status'] ) && in_array($post['post_status'], array('draft', 'pending', 'auto-draft')) && empty($postarr['edit_date']) &&
			 ('0000-00-00 00:00:00' == $post['post_date_gmt']) )
		$clear_date = true;
	else
		$clear_date = false;

	// Merge old and new fields with new fields overwriting old ones.
	$postarr = array_merge($post, $postarr);
	$postarr['post_category'] = $post_cats;
	if ( $clear_date ) {
		$postarr['post_date'] = current_time('mysql');
		$postarr['post_date_gmt'] = '';
	}

	if ($postarr['post_type'] == 'attachment')
		return wp_insert_attachment($postarr);

	return wp_insert_post( $postarr, $wp_error );
}

/**
 * Publish a post by transitioning the post status.
 *
 * @since 2.1.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int|WP_Post $post Post ID or post object.
 */
function wp_publish_post( $post ) {
	global $wpdb;

	if ( ! $post = get_post( $post ) )
		return;

	if ( 'publish' == $post->post_status )
		return;

	$wpdb->update( $wpdb->posts, array( 'post_status' => 'publish' ), array( 'ID' => $post->ID ) );

	clean_post_cache( $post->ID );

	$old_status = $post->post_status;
	$post->post_status = 'publish';
	wp_transition_post_status( 'publish', $old_status, $post );

	/** This action is documented in wp-includes/post.php */
	do_action( 'edit_post', $post->ID, $post );

	/** This action is documented in wp-includes/post.php */
	do_action( "save_post_{$post->post_type}", $post->ID, $post, true );

	/** This action is documented in wp-includes/post.php */
	do_action( 'save_post', $post->ID, $post, true );

	/** This action is documented in wp-includes/post.php */
	do_action( 'wp_insert_post', $post->ID, $post, true );
}

/**
 * Publish future post and make sure post ID has future post status.
 *
 * Invoked by cron 'publish_future_post' event. This safeguard prevents cron
 * from publishing drafts, etc.
 *
 * @since 2.5.0
 *
 * @param int|WP_Post $post_id Post ID or post object.
 */
function check_and_publish_future_post( $post_id ) {
	$post = get_post($post_id);

	if ( empty($post) )
		return;

	if ( 'future' != $post->post_status )
		return;

	$time = strtotime( $post->post_date_gmt . ' GMT' );

	// Uh oh, someone jumped the gun!
	if ( $time > time() ) {
		wp_clear_scheduled_hook( 'publish_future_post', array( $post_id ) ); // clear anything else in the system
		wp_schedule_single_event( $time, 'publish_future_post', array( $post_id ) );
		return;
	}

	// wp_publish_post() returns no meaningful value.
	wp_publish_post( $post_id );
}

/**
 * Computes a unique slug for the post, when given the desired slug and some post details.
 *
 * @since 2.8.0
 *
 * @global wpdb       $wpdb WordPress database abstraction object.
 * @global WP_Rewrite $wp_rewrite
 *
 * @param string $slug        The desired slug (post_name).
 * @param int    $post_ID     Post ID.
 * @param string $post_status No uniqueness checks are made if the post is still draft or pending.
 * @param string $post_type   Post type.
 * @param int    $post_parent Post parent ID.
 * @return string Unique slug for the post, based on $post_name (with a -1, -2, etc. suffix)
 */
function wp_unique_post_slug( $slug, $post_ID, $post_status, $post_type, $post_parent ) {
	if ( in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ) ) || ( 'inherit' == $post_status && 'revision' == $post_type ) || 'user_request' === $post_type )
		return $slug;

	global $wpdb, $wp_rewrite;

	$original_slug = $slug;

	$feeds = $wp_rewrite->feeds;
	if ( ! is_array( $feeds ) )
		$feeds = array();

	if ( 'attachment' == $post_type ) {
		// Attachment slugs must be unique across all types.
		$check_sql = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND ID != %d LIMIT 1";
		$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_ID ) );

		/**
		 * Filters whether the post slug would make a bad attachment slug.
		 *
		 * @since 3.1.0
		 *
		 * @param bool   $bad_slug Whether the slug would be bad as an attachment slug.
		 * @param string $slug     The post slug.
		 */
		if ( $post_name_check || in_array( $slug, $feeds ) || 'embed' === $slug || apply_filters( 'wp_unique_post_slug_is_bad_attachment_slug', false, $slug ) ) {
			$suffix = 2;
			do {
				$alt_post_name = _truncate_post_slug( $slug, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix";
				$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_ID ) );
				$suffix++;
			} while ( $post_name_check );
			$slug = $alt_post_name;
		}
	} elseif ( is_post_type_hierarchical( $post_type ) ) {
		if ( 'nav_menu_item' == $post_type )
			return $slug;

		/*
		 * Page slugs must be unique within their own trees. Pages are in a separate
		 * namespace than posts so page slugs are allowed to overlap post slugs.
		 */
		$check_sql = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND post_type IN ( %s, 'attachment' ) AND ID != %d AND post_parent = %d LIMIT 1";
		$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_type, $post_ID, $post_parent ) );

		/**
		 * Filters whether the post slug would make a bad hierarchical post slug.
		 *
		 * @since 3.1.0
		 *
		 * @param bool   $bad_slug    Whether the post slug would be bad in a hierarchical post context.
		 * @param string $slug        The post slug.
		 * @param string $post_type   Post type.
		 * @param int    $post_parent Post parent ID.
		 */
		if ( $post_name_check || in_array( $slug, $feeds ) || 'embed' === $slug || preg_match( "@^($wp_rewrite->pagination_base)?\d+$@", $slug )  || apply_filters( 'wp_unique_post_slug_is_bad_hierarchical_slug', false, $slug, $post_type, $post_parent ) ) {
			$suffix = 2;
			do {
				$alt_post_name = _truncate_post_slug( $slug, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix";
				$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_type, $post_ID, $post_parent ) );
				$suffix++;
			} while ( $post_name_check );
			$slug = $alt_post_name;
		}
	} else {
		// Post slugs must be unique across all posts.
		$check_sql = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND post_type = %s AND ID != %d LIMIT 1";
		$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_type, $post_ID ) );

		// Prevent new post slugs that could result in URLs that conflict with date archives.
		$post = get_post( $post_ID );
		$conflicts_with_date_archive = false;
		if ( 'post' === $post_type && ( ! $post || $post->post_name !== $slug ) && preg_match( '/^[0-9]+$/', $slug ) && $slug_num = intval( $slug ) ) {
			$permastructs   = array_values( array_filter( explode( '/', get_option( 'permalink_structure' ) ) ) );
			$postname_index = array_search( '%postname%', $permastructs );

			/*
			 * Potential date clashes are as follows:
			 *
			 * - Any integer in the first permastruct position could be a year.
			 * - An integer between 1 and 12 that follows 'year' conflicts with 'monthnum'.
			 * - An integer between 1 and 31 that follows 'monthnum' conflicts with 'day'.
			 */
			if ( 0 === $postname_index ||
				( $postname_index && '%year%' === $permastructs[ $postname_index - 1 ] && 13 > $slug_num ) ||
				( $postname_index && '%monthnum%' === $permastructs[ $postname_index - 1 ] && 32 > $slug_num )
			) {
				$conflicts_with_date_archive = true;
			}
		}

		/**
		 * Filters whether the post slug would be bad as a flat slug.
		 *
		 * @since 3.1.0
		 *
		 * @param bool   $bad_slug  Whether the post slug would be bad as a flat slug.
		 * @param string $slug      The post slug.
		 * @param string $post_type Post type.
		 */
		if ( $post_name_check || in_array( $slug, $feeds ) || 'embed' === $slug || $conflicts_with_date_archive || apply_filters( 'wp_unique_post_slug_is_bad_flat_slug', false, $slug, $post_type ) ) {
			$suffix = 2;
			do {
				$alt_post_name = _truncate_post_slug( $slug, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix";
				$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_type, $post_ID ) );
				$suffix++;
			} while ( $post_name_check );
			$slug = $alt_post_name;
		}
	}

	/**
	 * Filters the unique post slug.
	 *
	 * @since 3.3.0
	 *
	 * @param string $slug          The post slug.
	 * @param int    $post_ID       Post ID.
	 * @param string $post_status   The post status.
	 * @param string $post_type     Post type.
	 * @param int    $post_parent   Post parent ID
	 * @param string $original_slug The original post slug.
	 */
	return apply_filters( 'wp_unique_post_slug', $slug, $post_ID, $post_status, $post_type, $post_parent, $original_slug );
}

/**
 * Truncate a post slug.
 *
 * @since 3.6.0
 * @access private
 *
 * @see utf8_uri_encode()
 *
 * @param string $slug   The slug to truncate.
 * @param int    $length Optional. Max length of the slug. Default 200 (characters).
 * @return string The truncated slug.
 */
function _truncate_post_slug( $slug, $length = 200 ) {
	if ( strlen( $slug ) > $length ) {
		$decoded_slug = urldecode( $slug );
		if ( $decoded_slug === $slug )
			$slug = substr( $slug, 0, $length );
		else
			$slug = utf8_uri_encode( $decoded_slug, $length );
	}

	return rtrim( $slug, '-' );
}

/**
 * Add tags to a post.
 *
 * @see wp_set_post_tags()
 *
 * @since 2.3.0
 *
 * @param int          $post_id Optional. The Post ID. Does not default to the ID of the global $post.
 * @param string|array $tags    Optional. An array of tags to set for the post, or a string of tags
 *                              separated by commas. Default empty.
 * @return array|false|WP_Error Array of affected term IDs. WP_Error or false on failure.
 */
function wp_add_post_tags( $post_id = 0, $tags = '' ) {
	return wp_set_post_tags($post_id, $tags, true);
}

/**
 * Set the tags for a post.
 *
 * @since 2.3.0
 *
 * @see wp_set_object_terms()
 *
 * @param int          $post_id Optional. The Post ID. Does not default to the ID of the global $post.
 * @param string|array $tags    Optional. An array of tags to set for the post, or a string of tags
 *                              separated by commas. Default empty.
 * @param bool         $append  Optional. If true, don't delete existing tags, just add on. If false,
 *                              replace the tags with the new tags. Default false.
 * @return array|false|WP_Error Array of term taxonomy IDs of affected terms. WP_Error or false on failure.
 */
function wp_set_post_tags( $post_id = 0, $tags = '', $append = false ) {
	return wp_set_post_terms( $post_id, $tags, 'post_tag', $append);
}

/**
 * Set the terms for a post.
 *
 * @since 2.8.0
 *
 * @see wp_set_object_terms()
 *
 * @param int          $post_id  Optional. The Post ID. Does not default to the ID of the global $post.
 * @param string|array $tags     Optional. An array of terms to set for the post, or a string of terms
 *                               separated by commas. Default empty.
 * @param string       $taxonomy Optional. Taxonomy name. Default 'post_tag'.
 * @param bool         $append   Optional. If true, don't delete existing terms, just add on. If false,
 *                               replace the terms with the new terms. Default false.
 * @return array|false|WP_Error Array of term taxonomy IDs of affected terms. WP_Error or false on failure.
 */
function wp_set_post_terms( $post_id = 0, $tags = '', $taxonomy = 'post_tag', $append = false ) {
	$post_id = (int) $post_id;

	if ( !$post_id )
		return false;

	if ( empty($tags) )
		$tags = array();

	if ( ! is_array( $tags ) ) {
		$comma = _x( ',', 'tag delimiter' );
		if ( ',' !== $comma )
			$tags = str_replace( $comma, ',', $tags );
		$tags = explode( ',', trim( $tags, " \n\t\r\0\x0B," ) );
	}

	/*
	 * Hierarchical taxonomies must always pass IDs rather than names so that
	 * children with the same names but different parents aren't confused.
	 */
	if ( is_taxonomy_hierarchical( $taxonomy ) ) {
		$tags = array_unique( array_map( 'intval', $tags ) );
	}

	return wp_set_object_terms( $post_id, $tags, $taxonomy, $append );
}

/**
 * Set categories for a post.
 *
 * If the post categories parameter is not set, then the default category is
 * going used.
 *
 * @since 2.1.0
 *
 * @param int       $post_ID         Optional. The Post ID. Does not default to the ID
 *                                   of the global $post. Default 0.
 * @param array|int $post_categories Optional. List of categories or ID of category.
 *                                   Default empty array.
 * @param bool      $append         If true, don't delete existing categories, just add on.
 *                                  If false, replace the categories with the new categories.
 * @return array|false|WP_Error Array of term taxonomy IDs of affected categories. WP_Error or false on failure.
 */
function wp_set_post_categories( $post_ID = 0, $post_categories = array(), $append = false ) {
	$post_ID = (int) $post_ID;
	$post_type = get_post_type( $post_ID );
	$post_status = get_post_status( $post_ID );
	// If $post_categories isn't already an array, make it one:
	$post_categories = (array) $post_categories;
	if ( empty( $post_categories ) ) {
		if ( 'post' == $post_type && 'auto-draft' != $post_status ) {
			$post_categories = array( get_option('default_category') );
			$append = false;
		} else {
			$post_categories = array();
		}
	} elseif ( 1 == count( $post_categories ) && '' == reset( $post_categories ) ) {
		return true;
	}

	return wp_set_post_terms( $post_ID, $post_categories, 'category', $append );
}

/**
 * Fires actions related to the transitioning of a post's status.
 *
 * When a post is saved, the post status is "transitioned" from one status to another,
 * though this does not always mean the status has actually changed before and after
 * the save. This function fires a number of action hooks related to that transition:
 * the generic {@see 'transition_post_status'} action, as well as the dynamic hooks
 * {@see '$old_status_to_$new_status'} and {@see '$new_status_$post->post_type'}. Note
 * that the function does not transition the post object in the database.
 *
 * For instance: When publishing a post for the first time, the post status may transition
 * from 'draft' – or some other status – to 'publish'. However, if a post is already
 * published and is simply being updated, the "old" and "new" statuses may both be 'publish'
 * before and after the transition.
 *
 * @since 2.3.0
 *
 * @param string  $new_status Transition to this post status.
 * @param string  $old_status Previous post status.
 * @param WP_Post $post Post data.
 */
function wp_transition_post_status( $new_status, $old_status, $post ) {
	/**
	 * Fires when a post is transitioned from one status to another.
	 *
	 * @since 2.3.0
	 *
	 * @param string  $new_status New post status.
	 * @param string  $old_status Old post status.
	 * @param WP_Post $post       Post object.
	 */
	do_action( 'transition_post_status', $new_status, $old_status, $post );

	/**
	 * Fires when a post is transitioned from one status to another.
	 *
	 * The dynamic portions of the hook name, `$new_status` and `$old status`,
	 * refer to the old and new post statuses, respectively.
	 *
	 * @since 2.3.0
	 *
	 * @param WP_Post $post Post object.
	 */
	do_action( "{$old_status}_to_{$new_status}", $post );

	/**
	 * Fires when a post is transitioned from one status to another.
	 *
	 * The dynamic portions of the hook name, `$new_status` and `$post->post_type`,
	 * refer to the new post status and post type, respectively.
	 *
	 * Please note: When this action is hooked using a particular post status (like
	 * 'publish', as `publish_{$post->post_type}`), it will fire both when a post is
	 * first transitioned to that status from something else, as well as upon
	 * subsequent post updates (old and new status are both the same).
	 *
	 * Therefore, if you are looking to only fire a callback when a post is first
	 * transitioned to a status, use the {@see 'transition_post_status'} hook instead.
	 *
	 * @since 2.3.0
	 *
	 * @param int     $post_id Post ID.
	 * @param WP_Post $post    Post object.
	 */
	do_action( "{$new_status}_{$post->post_type}", $post->ID, $post );
}

//
// Comment, trackback, and pingback functions.
//

/**
 * Add a URL to those already pinged.
 *
 * @since 1.5.0
 * @since 4.7.0 $post_id can be a WP_Post object.
 * @since 4.7.0 $uri can be an array of URIs.
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int|WP_Post  $post_id Post object or ID.
 * @param string|array $uri     Ping URI or array of URIs.
 * @return int|false How many rows were updated.
 */
function add_ping( $post_id, $uri ) {
	global $wpdb;

	$post = get_post( $post_id );
	if ( ! $post ) {
		return false;
	}

	$pung = trim( $post->pinged );
	$pung = preg_split( '/\s/', $pung );

	if ( is_array( $uri ) ) {
		$pung = array_merge( $pung, $uri );
	}
	else {
		$pung[] = $uri;
	}
	$new = implode("\n", $pung);

	/**
	 * Filters the new ping URL to add for the given post.
	 *
	 * @since 2.0.0
	 *
	 * @param string $new New ping URL to add.
	 */
	$new = apply_filters( 'add_ping', $new );

	$return = $wpdb->update( $wpdb->posts, array( 'pinged' => $new ), array( 'ID' => $post->ID ) );
	clean_post_cache( $post->ID );
	return $return;
}

/**
 * Retrieve enclosures already enclosed for a post.
 *
 * @since 1.5.0
 *
 * @param int $post_id Post ID.
 * @return array List of enclosures.
 */
function get_enclosed( $post_id ) {
	$custom_fields = get_post_custom( $post_id );
	$pung = array();
	if ( !is_array( $custom_fields ) )
		return $pung;

	foreach ( $custom_fields as $key => $val ) {
		if ( 'enclosure' != $key || !is_array( $val ) )
			continue;
		foreach ( $val as $enc ) {
			$enclosure = explode( "\n", $enc );
			$pung[] = trim( $enclosure[ 0 ] );
		}
	}

	/**
	 * Filters the list of enclosures already enclosed for the given post.
	 *
	 * @since 2.0.0
	 *
	 * @param array $pung    Array of enclosures for the given post.
	 * @param int   $post_id Post ID.
	 */
	return apply_filters( 'get_enclosed', $pung, $post_id );
}

/**
 * Retrieve URLs already pinged for a post.
 *
 * @since 1.5.0
 *
 * @since 4.7.0 $post_id can be a WP_Post object.
 *
 * @param int|WP_Post $post_id Post ID or object.
 * @return array
 */
function get_pung( $post_id ) {
	$post = get_post( $post_id );
	if ( ! $post ) {
		return false;
	}

	$pung = trim( $post->pinged );
	$pung = preg_split( '/\s/', $pung );

	/**
	 * Filters the list of already-pinged URLs for the given post.
	 *
	 * @since 2.0.0
	 *
	 * @param array $pung Array of URLs already pinged for the given post.
	 */
	return apply_filters( 'get_pung', $pung );
}

/**
 * Retrieve URLs that need to be pinged.
 *
 * @since 1.5.0
 * @since 4.7.0 $post_id can be a WP_Post object.
 *
 * @param int|WP_Post $post_id Post Object or ID
 * @return array
 */
function get_to_ping( $post_id ) {
	$post = get_post( $post_id );

	if ( ! $post ) {
		return false;
	}

	$to_ping = sanitize_trackback_urls( $post->to_ping );
	$to_ping = preg_split('/\s/', $to_ping, -1, PREG_SPLIT_NO_EMPTY);

	/**
	 * Filters the list of URLs yet to ping for the given post.
	 *
	 * @since 2.0.0
	 *
	 * @param array $to_ping List of URLs yet to ping.
	 */
	return apply_filters( 'get_to_ping', $to_ping );
}

/**
 * Do trackbacks for a list of URLs.
 *
 * @since 1.0.0
 *
 * @param string $tb_list Comma separated list of URLs.
 * @param int    $post_id Post ID.
 */
function trackback_url_list( $tb_list, $post_id ) {
	if ( ! empty( $tb_list ) ) {
		// Get post data.
		$postdata = get_post( $post_id, ARRAY_A );

		// Form an excerpt.
		$excerpt = strip_tags( $postdata['post_excerpt'] ? $postdata['post_excerpt'] : $postdata['post_content'] );

		if ( strlen( $excerpt ) > 255 ) {
			$excerpt = substr( $excerpt, 0, 252 ) . '&hellip;';
		}

		$trackback_urls = explode( ',', $tb_list );
		foreach ( (array) $trackback_urls as $tb_url ) {
			$tb_url = trim( $tb_url );
			trackback( $tb_url, wp_unslash( $postdata['post_title'] ), $excerpt, $post_id );
		}
	}
}

//
// Page functions
//

/**
 * Get a list of page IDs.
 *
 * @since 2.0.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @return array List of page IDs.
 */
function get_all_page_ids() {
	global $wpdb;

	$page_ids = wp_cache_get('all_page_ids', 'posts');
	if ( ! is_array( $page_ids ) ) {
		$page_ids = $wpdb->get_col("SELECT ID FROM $wpdb->posts WHERE post_type = 'page'");
		wp_cache_add('all_page_ids', $page_ids, 'posts');
	}

	return $page_ids;
}

/**
 * Retrieves page data given a page ID or page object.
 *
 * Use get_post() instead of get_page().
 *
 * @since 1.5.1
 * @deprecated 3.5.0 Use get_post()
 *
 * @param mixed  $page   Page object or page ID. Passed by reference.
 * @param string $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
 *                       a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
 * @param string $filter Optional. How the return value should be filtered. Accepts 'raw',
 *                       'edit', 'db', 'display'. Default 'raw'.
 * @return WP_Post|array|null WP_Post (or array) on success, or null on failure.
 */
function get_page( $page, $output = OBJECT, $filter = 'raw') {
	return get_post( $page, $output, $filter );
}

/**
 * Retrieves a page given its path.
 *
 * @since 2.1.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string       $page_path Page path.
 * @param string       $output    Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
 *                                a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
 * @param string|array $post_type Optional. Post type or array of post types. Default 'page'.
 * @return WP_Post|array|null WP_Post (or array) on success, or null on failure.
 */
function get_page_by_path( $page_path, $output = OBJECT, $post_type = 'page' ) {
	global $wpdb;

	$last_changed = wp_cache_get_last_changed( 'posts' );

	$hash = md5( $page_path . serialize( $post_type ) );
	$cache_key = "get_page_by_path:$hash:$last_changed";
	$cached = wp_cache_get( $cache_key, 'posts' );
	if ( false !== $cached ) {
		// Special case: '0' is a bad `$page_path`.
		if ( '0' === $cached || 0 === $cached ) {
			return;
		} else {
			return get_post( $cached, $output );
		}
	}

	$page_path = rawurlencode(urldecode($page_path));
	$page_path = str_replace('%2F', '/', $page_path);
	$page_path = str_replace('%20', ' ', $page_path);
	$parts = explode( '/', trim( $page_path, '/' ) );
	$parts = array_map( 'sanitize_title_for_query', $parts );
	$escaped_parts = esc_sql( $parts );

	$in_string = "'" . implode( "','", $escaped_parts ) . "'";

	if ( is_array( $post_type ) ) {
		$post_types = $post_type;
	} else {
		$post_types = array( $post_type, 'attachment' );
	}

	$post_types = esc_sql( $post_types );
	$post_type_in_string = "'" . implode( "','", $post_types ) . "'";
	$sql = "
		SELECT ID, post_name, post_parent, post_type
		FROM $wpdb->posts
		WHERE post_name IN ($in_string)
		AND post_type IN ($post_type_in_string)
	";

	$pages = $wpdb->get_results( $sql, OBJECT_K );

	$revparts = array_reverse( $parts );

	$foundid = 0;
	foreach ( (array) $pages as $page ) {
		if ( $page->post_name == $revparts[0] ) {
			$count = 0;
			$p = $page;

			/*
			 * Loop through the given path parts from right to left,
			 * ensuring each matches the post ancestry.
			 */
			while ( $p->post_parent != 0 && isset( $pages[ $p->post_parent ] ) ) {
				$count++;
				$parent = $pages[ $p->post_parent ];
				if ( ! isset( $revparts[ $count ] ) || $parent->post_name != $revparts[ $count ] )
					break;
				$p = $parent;
			}

			if ( $p->post_parent == 0 && $count+1 == count( $revparts ) && $p->post_name == $revparts[ $count ] ) {
				$foundid = $page->ID;
				if ( $page->post_type == $post_type )
					break;
			}
		}
	}

	// We cache misses as well as hits.
	wp_cache_set( $cache_key, $foundid, 'posts' );

	if ( $foundid ) {
		return get_post( $foundid, $output );
	}
}

/**
 * Retrieve a page given its title.
 *
 * @since 2.1.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string       $page_title Page title
 * @param string       $output     Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
 *                                 a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
 * @param string|array $post_type  Optional. Post type or array of post types. Default 'page'.
 * @return WP_Post|array|null WP_Post (or array) on success, or null on failure.
 */
function get_page_by_title( $page_title, $output = OBJECT, $post_type = 'page' ) {
	global $wpdb;

	if ( is_array( $post_type ) ) {
		$post_type = esc_sql( $post_type );
		$post_type_in_string = "'" . implode( "','", $post_type ) . "'";
		$sql = $wpdb->prepare( "
			SELECT ID
			FROM $wpdb->posts
			WHERE post_title = %s
			AND post_type IN ($post_type_in_string)
		", $page_title );
	} else {
		$sql = $wpdb->prepare( "
			SELECT ID
			FROM $wpdb->posts
			WHERE post_title = %s
			AND post_type = %s
		", $page_title, $post_type );
	}

	$page = $wpdb->get_var( $sql );

	if ( $page ) {
		return get_post( $page, $output );
	}
}

/**
 * Identify descendants of a given page ID in a list of page objects.
 *
 * Descendants are identified from the `$pages` array passed to the function. No database queries are performed.
 *
 * @since 1.5.1
 *
 * @param int   $page_id Page ID.
 * @param array $pages   List of page objects from which descendants should be identified.
 * @return array List of page children.
 */
function get_page_children( $page_id, $pages ) {
	// Build a hash of ID -> children.
	$children = array();
	foreach ( (array) $pages as $page ) {
		$children[ intval( $page->post_parent ) ][] = $page;
	}

	$page_list = array();

	// Start the search by looking at immediate children.
	if ( isset( $children[ $page_id ] ) ) {
		// Always start at the end of the stack in order to preserve original `$pages` order.
		$to_look = array_reverse( $children[ $page_id ] );

		while ( $to_look ) {
			$p = array_pop( $to_look );
			$page_list[] = $p;
			if ( isset( $children[ $p->ID ] ) ) {
				foreach ( array_reverse( $children[ $p->ID ] ) as $child ) {
					// Append to the `$to_look` stack to descend the tree.
					$to_look[] = $child;
				}
			}
		}
	}

	return $page_list;
}

/**
 * Order the pages with children under parents in a flat list.
 *
 * It uses auxiliary structure to hold parent-children relationships and
 * runs in O(N) complexity
 *
 * @since 2.0.0
 *
 * @param array $pages   Posts array (passed by reference).
 * @param int   $page_id Optional. Parent page ID. Default 0.
 * @return array A list arranged by hierarchy. Children immediately follow their parents.
 */
function get_page_hierarchy( &$pages, $page_id = 0 ) {
	if ( empty( $pages ) ) {
		return array();
	}

	$children = array();
	foreach ( (array) $pages as $p ) {
		$parent_id = intval( $p->post_parent );
		$children[ $parent_id ][] = $p;
	}

	$result = array();
	_page_traverse_name( $page_id, $children, $result );

	return $result;
}

/**
 * Traverse and return all the nested children post names of a root page.
 *
 * $children contains parent-children relations
 *
 * @since 2.9.0
 *
 * @see _page_traverse_name()
 *
 * @param int   $page_id   Page ID.
 * @param array $children  Parent-children relations (passed by reference).
 * @param array $result    Result (passed by reference).
 */
function _page_traverse_name( $page_id, &$children, &$result ){
	if ( isset( $children[ $page_id ] ) ){
		foreach ( (array)$children[ $page_id ] as $child ) {
			$result[ $child->ID ] = $child->post_name;
			_page_traverse_name( $child->ID, $children, $result );
		}
	}
}

/**
 * Build the URI path for a page.
 *
 * Sub pages will be in the "directory" under the parent page post name.
 *
 * @since 1.5.0
 * @since 4.6.0 Converted the `$page` parameter to optional.
 *
 * @param WP_Post|object|int $page Optional. Page ID or WP_Post object. Default is global $post.
 * @return string|false Page URI, false on error.
 */
function get_page_uri( $page = 0 ) {
	if ( ! $page instanceof WP_Post ) {
		$page = get_post( $page );
	}

	if ( ! $page )
		return false;

	$uri = $page->post_name;

	foreach ( $page->ancestors as $parent ) {
		$parent = get_post( $parent );
		if ( $parent && $parent->post_name ) {
			$uri = $parent->post_name . '/' . $uri;
		}
	}

	/**
	 * Filters the URI for a page.
	 *
	 * @since 4.4.0
	 *
	 * @param string  $uri  Page URI.
	 * @param WP_Post $page Page object.
	 */
	return apply_filters( 'get_page_uri', $uri, $page );
}

/**
 * Retrieve a list of pages (or hierarchical post type items).
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @since 1.5.0
 *
 * @param array|string $args {
 *     Optional. Array or string of arguments to retrieve pages.
 *
 *     @type int          $child_of     Page ID to return child and grandchild pages of. Note: The value
 *                                      of `$hierarchical` has no bearing on whether `$child_of` returns
 *                                      hierarchical results. Default 0, or no restriction.
 *     @type string       $sort_order   How to sort retrieved pages. Accepts 'ASC', 'DESC'. Default 'ASC'.
 *     @type string       $sort_column  What columns to sort pages by, comma-separated. Accepts 'post_author',
 *                                      'post_date', 'post_title', 'post_name', 'post_modified', 'menu_order',
 *                                      'post_modified_gmt', 'post_parent', 'ID', 'rand', 'comment_count'.
 *                                      'post_' can be omitted for any values that start with it.
 *                                      Default 'post_title'.
 *     @type bool         $hierarchical Whether to return pages hierarchically. If false in conjunction with
 *                                      `$child_of` also being false, both arguments will be disregarded.
 *                                      Default true.
 *     @type array        $exclude      Array of page IDs to exclude. Default empty array.
 *     @type array        $include      Array of page IDs to include. Cannot be used with `$child_of`,
 *                                      `$parent`, `$exclude`, `$meta_key`, `$meta_value`, or `$hierarchical`.
 *                                      Default empty array.
 *     @type string       $meta_key     Only include pages with this meta key. Default empty.
 *     @type string       $meta_value   Only include pages with this meta value. Requires `$meta_key`.
 *                                      Default empty.
 *     @type string       $authors      A comma-separated list of author IDs. Default empty.
 *     @type int          $parent       Page ID to return direct children of. Default -1, or no restriction.
 *     @type string|array $exclude_tree Comma-separated string or array of page IDs to exclude.
 *                                      Default empty array.
 *     @type int          $number       The number of pages to return. Default 0, or all pages.
 *     @type int          $offset       The number of pages to skip before returning. Requires `$number`.
 *                                      Default 0.
 *     @type string       $post_type    The post type to query. Default 'page'.
 *     @type string|array $post_status  A comma-separated list or array of post statuses to include.
 *                                      Default 'publish'.
 * }
 * @return array|false List of pages matching defaults or `$args`.
 */
function get_pages( $args = array() ) {
	global $wpdb;

	$defaults = array(
		'child_of'     => 0,
		'sort_order'   => 'ASC',
		'sort_column'  => 'post_title',
		'hierarchical' => 1,
		'exclude'      => array(),
		'include'      => array(),
		'meta_key'     => '',
		'meta_value'   => '',
		'authors'      => '',
		'parent'       => -1,
		'exclude_tree' => array(),
		'number'       => '',
		'offset'       => 0,
		'post_type'    => 'page',
		'post_status'  => 'publish',
	);

	$r = wp_parse_args( $args, $defaults );

	$number = (int) $r['number'];
	$offset = (int) $r['offset'];
	$child_of = (int) $r['child_of'];
	$hierarchical = $r['hierarchical'];
	$exclude = $r['exclude'];
	$meta_key = $r['meta_key'];
	$meta_value = $r['meta_value'];
	$parent = $r['parent'];
	$post_status = $r['post_status'];

	// Make sure the post type is hierarchical.
	$hierarchical_post_types = get_post_types( array( 'hierarchical' => true ) );
	if ( ! in_array( $r['post_type'], $hierarchical_post_types ) ) {
		return false;
	}

	if ( $parent > 0 && ! $child_of ) {
		$hierarchical = false;
	}

	// Make sure we have a valid post status.
	if ( ! is_array( $post_status ) ) {
		$post_status = explode( ',', $post_status );
	}
	if ( array_diff( $post_status, get_post_stati() ) ) {
		return false;
	}

	// $args can be whatever, only use the args defined in defaults to compute the key.
	$key = md5( serialize( wp_array_slice_assoc( $r, array_keys( $defaults ) ) ) );
	$last_changed = wp_cache_get_last_changed( 'posts' );

	$cache_key = "get_pages:$key:$last_changed";
	if ( $cache = wp_cache_get( $cache_key, 'posts' ) ) {
		// Convert to WP_Post instances.
		$pages = array_map( 'get_post', $cache );
		/** This filter is documented in wp-includes/post.php */
		$pages = apply_filters( 'get_pages', $pages, $r );
		return $pages;
	}

	$inclusions = '';
	if ( ! empty( $r['include'] ) ) {
		$child_of = 0; //ignore child_of, parent, exclude, meta_key, and meta_value params if using include
		$parent = -1;
		$exclude = '';
		$meta_key = '';
		$meta_value = '';
		$hierarchical = false;
		$incpages = wp_parse_id_list( $r['include'] );
		if ( ! empty( $incpages ) ) {
			$inclusions = ' AND ID IN (' . implode( ',', $incpages ) .  ')';
		}
	}

	$exclusions = '';
	if ( ! empty( $exclude ) ) {
		$expages = wp_parse_id_list( $exclude );
		if ( ! empty( $expages ) ) {
			$exclusions = ' AND ID NOT IN (' . implode( ',', $expages ) .  ')';
		}
	}

	$author_query = '';
	if ( ! empty( $r['authors'] ) ) {
		$post_authors = preg_split( '/[\s,]+/', $r['authors'] );

		if ( ! empty( $post_authors ) ) {
			foreach ( $post_authors as $post_author ) {
				//Do we have an author id or an author login?
				if ( 0 == intval($post_author) ) {
					$post_author = get_user_by('login', $post_author);
					if ( empty( $post_author ) ) {
						continue;
					}
					if ( empty( $post_author->ID ) ) {
						continue;
					}
					$post_author = $post_author->ID;
				}

				if ( '' == $author_query ) {
					$author_query = $wpdb->prepare(' post_author = %d ', $post_author);
				} else {
					$author_query .= $wpdb->prepare(' OR post_author = %d ', $post_author);
				}
			}
			if ( '' != $author_query ) {
				$author_query = " AND ($author_query)";
			}
		}
	}

	$join = '';
	$where = "$exclusions $inclusions ";
	if ( '' !== $meta_key || '' !== $meta_value ) {
		$join = " LEFT JOIN $wpdb->postmeta ON ( $wpdb->posts.ID = $wpdb->postmeta.post_id )";

		// meta_key and meta_value might be slashed
		$meta_key = wp_unslash($meta_key);
		$meta_value = wp_unslash($meta_value);
		if ( '' !== $meta_key ) {
			$where .= $wpdb->prepare(" AND $wpdb->postmeta.meta_key = %s", $meta_key);
		}
		if ( '' !== $meta_value ) {
			$where .= $wpdb->prepare(" AND $wpdb->postmeta.meta_value = %s", $meta_value);
		}

	}

	if ( is_array( $parent ) ) {
		$post_parent__in = implode( ',', array_map( 'absint', (array) $parent ) );
		if ( ! empty( $post_parent__in ) ) {
			$where .= " AND post_parent IN ($post_parent__in)";
		}
	} elseif ( $parent >= 0 ) {
		$where .= $wpdb->prepare(' AND post_parent = %d ', $parent);
	}

	if ( 1 == count( $post_status ) ) {
		$where_post_type = $wpdb->prepare( "post_type = %s AND post_status = %s", $r['post_type'], reset( $post_status ) );
	} else {
		$post_status = implode( "', '", $post_status );
		$where_post_type = $wpdb->prepare( "post_type = %s AND post_status IN ('$post_status')", $r['post_type'] );
	}

	$orderby_array = array();
	$allowed_keys = array( 'author', 'post_author', 'date', 'post_date', 'title', 'post_title', 'name', 'post_name', 'modified',
		'post_modified', 'modified_gmt', 'post_modified_gmt', 'menu_order', 'parent', 'post_parent',
		'ID', 'rand', 'comment_count' );

	foreach ( explode( ',', $r['sort_column'] ) as $orderby ) {
		$orderby = trim( $orderby );
		if ( ! in_array( $orderby, $allowed_keys ) ) {
			continue;
		}

		switch ( $orderby ) {
			case 'menu_order':
				break;
			case 'ID':
				$orderby = "$wpdb->posts.ID";
				break;
			case 'rand':
				$orderby = 'RAND()';
				break;
			case 'comment_count':
				$orderby = "$wpdb->posts.comment_count";
				break;
			default:
				if ( 0 === strpos( $orderby, 'post_' ) ) {
					$orderby = "$wpdb->posts." . $orderby;
				} else {
					$orderby = "$wpdb->posts.post_" . $orderby;
				}
		}

		$orderby_array[] = $orderby;

	}
	$sort_column = ! empty( $orderby_array ) ? implode( ',', $orderby_array ) : "$wpdb->posts.post_title";

	$sort_order = strtoupper( $r['sort_order'] );
	if ( '' !== $sort_order && ! in_array( $sort_order, array( 'ASC', 'DESC' ) ) ) {
		$sort_order = 'ASC';
	}

	$query = "SELECT * FROM $wpdb->posts $join WHERE ($where_post_type) $where ";
	$query .= $author_query;
	$query .= " ORDER BY " . $sort_column . " " . $sort_order ;

	if ( ! empty( $number ) ) {
		$query .= ' LIMIT ' . $offset . ',' . $number;
	}

	$pages = $wpdb->get_results($query);

	if ( empty($pages) ) {
		/** This filter is documented in wp-includes/post.php */
		$pages = apply_filters( 'get_pages', array(), $r );
		return $pages;
	}

	// Sanitize before caching so it'll only get done once.
	$num_pages = count($pages);
	for ($i = 0; $i < $num_pages; $i++) {
		$pages[$i] = sanitize_post($pages[$i], 'raw');
	}

	// Update cache.
	update_post_cache( $pages );

	if ( $child_of || $hierarchical ) {
		$pages = get_page_children($child_of, $pages);
	}

	if ( ! empty( $r['exclude_tree'] ) ) {
		$exclude = wp_parse_id_list( $r['exclude_tree'] );
		foreach ( $exclude as $id ) {
			$children = get_page_children( $id, $pages );
			foreach ( $children as $child ) {
				$exclude[] = $child->ID;
			}
		}

		$num_pages = count( $pages );
		for ( $i = 0; $i < $num_pages; $i++ ) {
			if ( in_array( $pages[$i]->ID, $exclude ) ) {
				unset( $pages[$i] );
			}
		}
	}

	$page_structure = array();
	foreach ( $pages as $page ) {
		$page_structure[] = $page->ID;
	}

	wp_cache_set( $cache_key, $page_structure, 'posts' );

	// Convert to WP_Post instances
	$pages = array_map( 'get_post', $pages );

	/**
	 * Filters the retrieved list of pages.
	 *
	 * @since 2.1.0
	 *
	 * @param array $pages List of pages to retrieve.
	 * @param array $r     Array of get_pages() arguments.
	 */
	return apply_filters( 'get_pages', $pages, $r );
}

//
// Attachment functions
//

/**
 * Determines whether an attachment URI is local and really an attachment.
 * 
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
 * Conditional Tags} article in the Theme Developer Handbook.
 * 
 * @since 2.0.0
 *
 * @param string $url URL to check
 * @return bool True on success, false on failure.
 */
function is_local_attachment($url) {
	if (strpos($url, home_url()) === false)
		return false;
	if (strpos($url, home_url('/?attachment_id=')) !== false)
		return true;
	if ( $id = url_to_postid($url) ) {
		$post = get_post($id);
		if ( 'attachment' == $post->post_type )
			return true;
	}
	return false;
}

/**
 * Insert an attachment.
 *
 * If you set the 'ID' in the $args parameter, it will mean that you are
 * updating and attempt to update the attachment. You can also set the
 * attachment name or title by setting the key 'post_name' or 'post_title'.
 *
 * You can set the dates for the attachment manually by setting the 'post_date'
 * and 'post_date_gmt' keys' values.
 *
 * By default, the comments will use the default settings for whether the
 * comments are allowed. You can close them manually or keep them open by
 * setting the value for the 'comment_status' key.
 *
 * @since 2.0.0
 * @since 4.7.0 Added the `$wp_error` parameter to allow a WP_Error to be returned on failure.
 *
 * @see wp_insert_post()
 *
 * @param string|array $args     Arguments for inserting an attachment.
 * @param string       $file     Optional. Filename.
 * @param int          $parent   Optional. Parent post ID.
 * @param bool         $wp_error Optional. Whether to return a WP_Error on failure. Default false.
 * @return int|WP_Error The attachment ID on success. The value 0 or WP_Error on failure.
 */
function wp_insert_attachment( $args, $file = false, $parent = 0, $wp_error = false ) {
	$defaults = array(
		'file'        => $file,
		'post_parent' => 0
	);

	$data = wp_parse_args( $args, $defaults );

	if ( ! empty( $parent ) ) {
		$data['post_parent'] = $parent;
	}

	$data['post_type'] = 'attachment';

	return wp_insert_post( $data, $wp_error );
}

/**
 * Trash or delete an attachment.
 *
 * When an attachment is permanently deleted, the file will also be removed.
 * Deletion removes all post meta fields, taxonomy, comments, etc. associated
 * with the attachment (except the main post).
 *
 * The attachment is moved to the trash instead of permanently deleted unless trash
 * for media is disabled, item is already in the trash, or $force_delete is true.
 *
 * @since 2.0.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int  $post_id      Attachment ID.
 * @param bool $force_delete Optional. Whether to bypass trash and force deletion.
 *                           Default false.
 * @return WP_Post|false|null Post data on success, false or null on failure.
 */
function wp_delete_attachment( $post_id, $force_delete = false ) {
	global $wpdb;

	$post = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->posts WHERE ID = %d", $post_id ) );

	if ( ! $post ) {
		return $post;
	}

	$post = get_post( $post );

	if ( 'attachment' !== $post->post_type ) {
		return false;
	}

	if ( ! $force_delete && EMPTY_TRASH_DAYS && MEDIA_TRASH && 'trash' !== $post->post_status ) {
		return wp_trash_post( $post_id );
	}

	delete_post_meta($post_id, '_wp_trash_meta_status');
	delete_post_meta($post_id, '_wp_trash_meta_time');

	$meta = wp_get_attachment_metadata( $post_id );
	$backup_sizes = get_post_meta( $post->ID, '_wp_attachment_backup_sizes', true );
	$file = get_attached_file( $post_id );

	if ( is_multisite() )
		delete_transient( 'dirsize_cache' );

	/**
	 * Fires before an attachment is deleted, at the start of wp_delete_attachment().
	 *
	 * @since 2.0.0
	 *
	 * @param int $post_id Attachment ID.
	 */
	do_action( 'delete_attachment', $post_id );

	wp_delete_object_term_relationships($post_id, array('category', 'post_tag'));
	wp_delete_object_term_relationships($post_id, get_object_taxonomies($post->post_type));

	// Delete all for any posts.
	delete_metadata( 'post', null, '_thumbnail_id', $post_id, true );

	wp_defer_comment_counting( true );

	$comment_ids = $wpdb->get_col( $wpdb->prepare( "SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = %d", $post_id ));
	foreach ( $comment_ids as $comment_id ) {
		wp_delete_comment( $comment_id, true );
	}

	wp_defer_comment_counting( false );

	$post_meta_ids = $wpdb->get_col( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE post_id = %d ", $post_id ));
	foreach ( $post_meta_ids as $mid )
		delete_metadata_by_mid( 'post', $mid );

	/** This action is documented in wp-includes/post.php */
	do_action( 'delete_post', $post_id );
	$result = $wpdb->delete( $wpdb->posts, array( 'ID' => $post_id ) );
	if ( ! $result ) {
		return false;
	}
	/** This action is documented in wp-includes/post.php */
	do_action( 'deleted_post', $post_id );

	wp_delete_attachment_files( $post_id, $meta, $backup_sizes, $file );

	clean_post_cache( $post );

	return $post;
}

/**
 * Deletes all files that belong to the given attachment.
 *
 * @since 4.9.7
 *
 * @param int    $post_id      Attachment ID.
 * @param array  $meta         The attachment's meta data.
 * @param array  $backup_sizes The meta data for the attachment's backup images.
 * @param string $file         Absolute path to the attachment's file.
 * @return bool True on success, false on failure.
 */
function wp_delete_attachment_files( $post_id, $meta, $backup_sizes, $file ) {
	global $wpdb;

	$uploadpath = wp_get_upload_dir();
	$deleted    = true;

	if ( ! empty( $meta['thumb'] ) ) {
		// Don't delete the thumb if another attachment uses it.
		if ( ! $wpdb->get_row( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE meta_key = '_wp_attachment_metadata' AND meta_value LIKE %s AND post_id <> %d", '%' . $wpdb->esc_like( $meta['thumb'] ) . '%', $post_id ) ) ) {
			$thumbfile = str_replace( basename( $file ), $meta['thumb'], $file );
			if ( ! empty( $thumbfile ) ) {
				$thumbfile = path_join( $uploadpath['basedir'], $thumbfile );
				$thumbdir  = path_join( $uploadpath['basedir'], dirname( $file ) );

				if ( ! wp_delete_file_from_directory( $thumbfile, $thumbdir ) ) {
					$deleted = false;
				}
			}
		}
	}

	// Remove intermediate and backup images if there are any.
	if ( isset( $meta['sizes'] ) && is_array( $meta['sizes'] ) ) {
		$intermediate_dir = path_join( $uploadpath['basedir'], dirname( $file ) );
		foreach ( $meta['sizes'] as $size => $sizeinfo ) {
			$intermediate_file = str_replace( basename( $file ), $sizeinfo['file'], $file );
			if ( ! empty( $intermediate_file ) ) {
				$intermediate_file = path_join( $uploadpath['basedir'], $intermediate_file );

				if ( ! wp_delete_file_from_directory( $intermediate_file, $intermediate_dir ) ) {
					$deleted = false;
				}
			}
		}
	}

	if ( is_array( $backup_sizes ) ) {
		$del_dir = path_join( $uploadpath['basedir'], dirname( $meta['file'] ) );
		foreach ( $backup_sizes as $size ) {
			$del_file = path_join( dirname( $meta['file'] ), $size['file'] );
			if ( ! empty( $del_file ) ) {
				$del_file = path_join( $uploadpath['basedir'], $del_file );

				if ( ! wp_delete_file_from_directory( $del_file, $del_dir ) ) {
					$deleted = false;
				}
			}
		}
	}

	if ( ! wp_delete_file_from_directory( $file, $uploadpath['basedir'] ) ) {
		$deleted = false;
	}

	return $deleted;
}

/**
 * Retrieve attachment meta field for attachment ID.
 *
 * @since 2.1.0
 *
 * @param int  $attachment_id Attachment post ID. Defaults to global $post.
 * @param bool $unfiltered    Optional. If true, filters are not run. Default false.
 * @return mixed Attachment meta field. False on failure.
 */
function wp_get_attachment_metadata( $attachment_id = 0, $unfiltered = false ) {
	$attachment_id = (int) $attachment_id;
	if ( ! $post = get_post( $attachment_id ) ) {
		return false;
	}

	$data = get_post_meta( $post->ID, '_wp_attachment_metadata', true );

	if ( $unfiltered )
		return $data;

	/**
	 * Filters the attachment meta data.
	 *
	 * @since 2.1.0
	 *
	 * @param array|bool $data          Array of meta data for the given attachment, or false
	 *                                  if the object does not exist.
	 * @param int        $attachment_id Attachment post ID.
	 */
	return apply_filters( 'wp_get_attachment_metadata', $data, $post->ID );
}

/**
 * Update metadata for an attachment.
 *
 * @since 2.1.0
 *
 * @param int   $attachment_id Attachment post ID.
 * @param array $data          Attachment meta data.
 * @return int|bool False if $post is invalid.
 */
function wp_update_attachment_metadata( $attachment_id, $data ) {
	$attachment_id = (int) $attachment_id;
	if ( ! $post = get_post( $attachment_id ) ) {
		return false;
	}

	/**
	 * Filters the updated attachment meta data.
	 *
	 * @since 2.1.0
	 *
	 * @param array $data          Array of updated attachment meta data.
	 * @param int   $attachment_id Attachment post ID.
	 */
	if ( $data = apply_filters( 'wp_update_attachment_metadata', $data, $post->ID ) )
		return update_post_meta( $post->ID, '_wp_attachment_metadata', $data );
	else
		return delete_post_meta( $post->ID, '_wp_attachment_metadata' );
}

/**
 * Retrieve the URL for an attachment.
 *
 * @since 2.1.0
 *
 * @global string $pagenow
 *
 * @param int $attachment_id Optional. Attachment post ID. Defaults to global $post.
 * @return string|false Attachment URL, otherwise false.
 */
function wp_get_attachment_url( $attachment_id = 0 ) {
	$attachment_id = (int) $attachment_id;
	if ( ! $post = get_post( $attachment_id ) ) {
		return false;
	}

	if ( 'attachment' != $post->post_type )
		return false;

	$url = '';
	// Get attached file.
	if ( $file = get_post_meta( $post->ID, '_wp_attached_file', true ) ) {
		// Get upload directory.
		if ( ( $uploads = wp_get_upload_dir() ) && false === $uploads['error'] ) {
			// Check that the upload base exists in the file location.
			if ( 0 === strpos( $file, $uploads['basedir'] ) ) {
				// Replace file location with url location.
				$url = str_replace($uploads['basedir'], $uploads['baseurl'], $file);
			} elseif ( false !== strpos($file, 'wp-content/uploads') ) {
				// Get the directory name relative to the basedir (back compat for pre-2.7 uploads)
				$url = trailingslashit( $uploads['baseurl'] . '/' . _wp_get_attachment_relative_path( $file ) ) . basename( $file );
			} else {
				// It's a newly-uploaded file, therefore $file is relative to the basedir.
				$url = $uploads['baseurl'] . "/$file";
			}
		}
	}

	/*
	 * If any of the above options failed, Fallback on the GUID as used pre-2.7,
	 * not recommended to rely upon this.
	 */
	if ( empty($url) ) {
		$url = get_the_guid( $post->ID );
	}

	// On SSL front end, URLs should be HTTPS.
	if ( is_ssl() && ! is_admin() && 'wp-login.php' !== $GLOBALS['pagenow'] ) {
		$url = set_url_scheme( $url );
	}

	/**
	 * Filters the attachment URL.
	 *
	 * @since 2.1.0
	 *
	 * @param string $url           URL for the given attachment.
	 * @param int    $attachment_id Attachment post ID.
	 */
	$url = apply_filters( 'wp_get_attachment_url', $url, $post->ID );

	if ( empty( $url ) )
		return false;

	return $url;
}

/**
 * Retrieves the caption for an attachment.
 *
 * @since 4.6.0
 *
 * @param int $post_id Optional. Attachment ID. Default is the ID of the global `$post`.
 * @return string|false False on failure. Attachment caption on success.
 */
function wp_get_attachment_caption( $post_id = 0 ) {
	$post_id = (int) $post_id;
	if ( ! $post = get_post( $post_id ) ) {
		return false;
	}

	if ( 'attachment' !== $post->post_type ) {
		return false;
	}

	$caption = $post->post_excerpt;

	/**
	 * Filters the attachment caption.
	 *
	 * @since 4.6.0
	 *
	 * @param string $caption Caption for the given attachment.
	 * @param int    $post_id Attachment ID.
	 */
	return apply_filters( 'wp_get_attachment_caption', $caption, $post->ID );
}

/**
 * Retrieve thumbnail for an attachment.
 *
 * @since 2.1.0
 *
 * @param int $post_id Optional. Attachment ID. Default 0.
 * @return string|false False on failure. Thumbnail file path on success.
 */
function wp_get_attachment_thumb_file( $post_id = 0 ) {
	$post_id = (int) $post_id;
	if ( !$post = get_post( $post_id ) )
		return false;
	if ( !is_array( $imagedata = wp_get_attachment_metadata( $post->ID ) ) )
		return false;

	$file = get_attached_file( $post->ID );

	if ( !empty($imagedata['thumb']) && ($thumbfile = str_replace(basename($file), $imagedata['thumb'], $file)) && file_exists($thumbfile) ) {
		/**
		 * Filters the attachment thumbnail file path.
		 *
		 * @since 2.1.0
		 *
		 * @param string $thumbfile File path to the attachment thumbnail.
		 * @param int    $post_id   Attachment ID.
		 */
		return apply_filters( 'wp_get_attachment_thumb_file', $thumbfile, $post->ID );
	}
	return false;
}

/**
 * Retrieve URL for an attachment thumbnail.
 *
 * @since 2.1.0
 *
 * @param int $post_id Optional. Attachment ID. Default 0.
 * @return string|false False on failure. Thumbnail URL on success.
 */
function wp_get_attachment_thumb_url( $post_id = 0 ) {
	$post_id = (int) $post_id;
	if ( !$post = get_post( $post_id ) )
		return false;
	if ( !$url = wp_get_attachment_url( $post->ID ) )
		return false;

	$sized = image_downsize( $post_id, 'thumbnail' );
	if ( $sized )
		return $sized[0];

	if ( !$thumb = wp_get_attachment_thumb_file( $post->ID ) )
		return false;

	$url = str_replace(basename($url), basename($thumb), $url);

	/**
	 * Filters the attachment thumbnail URL.
	 *
	 * @since 2.1.0
	 *
	 * @param string $url     URL for the attachment thumbnail.
	 * @param int    $post_id Attachment ID.
	 */
	return apply_filters( 'wp_get_attachment_thumb_url', $url, $post->ID );
}

/**
 * Verifies an attachment is of a given type.
 *
 * @since 4.2.0
 *
 * @param string      $type Attachment type. Accepts 'image', 'audio', or 'video'.
 * @param int|WP_Post $post Optional. Attachment ID or object. Default is global $post.
 * @return bool True if one of the accepted types, false otherwise.
 */
function wp_attachment_is( $type, $post = null ) {
	if ( ! $post = get_post( $post ) ) {
		return false;
	}

	if ( ! $file = get_attached_file( $post->ID ) ) {
		return false;
	}

	if ( 0 === strpos( $post->post_mime_type, $type . '/' ) ) {
		return true;
	}

	$check = wp_check_filetype( $file );
	if ( empty( $check['ext'] ) ) {
		return false;
	}

	$ext = $check['ext'];

	if ( 'import' !== $post->post_mime_type ) {
		return $type === $ext;
	}

	switch ( $type ) {
	case 'image':
		$image_exts = array( 'jpg', 'jpeg', 'jpe', 'gif', 'png' );
		return in_array( $ext, $image_exts );

	case 'audio':
		return in_array( $ext, wp_get_audio_extensions() );

	case 'video':
		return in_array( $ext, wp_get_video_extensions() );

	default:
		return $type === $ext;
	}
}

/**
 * Determines whether an attachment is an image.
 * 
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ 
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 2.1.0
 * @since 4.2.0 Modified into wrapper for wp_attachment_is() and
 *              allowed WP_Post object to be passed.
 *
 * @param int|WP_Post $post Optional. Attachment ID or object. Default is global $post.
 * @return bool Whether the attachment is an image.
 */
function wp_attachment_is_image( $post = null ) {
	return wp_attachment_is( 'image', $post );
}

/**
 * Retrieve the icon for a MIME type.
 *
 * @since 2.1.0
 *
 * @param string|int $mime MIME type or attachment ID.
 * @return string|false Icon, false otherwise.
 */
function wp_mime_type_icon( $mime = 0 ) {
	if ( !is_numeric($mime) )
		$icon = wp_cache_get("mime_type_icon_$mime");

	$post_id = 0;
	if ( empty($icon) ) {
		$post_mimes = array();
		if ( is_numeric($mime) ) {
			$mime = (int) $mime;
			if ( $post = get_post( $mime ) ) {
				$post_id = (int) $post->ID;
				$file = get_attached_file( $post_id );
				$ext = preg_replace('/^.+?\.([^.]+)$/', '$1', $file);
				if ( !empty($ext) ) {
					$post_mimes[] = $ext;
					if ( $ext_type = wp_ext2type( $ext ) )
						$post_mimes[] = $ext_type;
				}
				$mime = $post->post_mime_type;
			} else {
				$mime = 0;
			}
		} else {
			$post_mimes[] = $mime;
		}

		$icon_files = wp_cache_get('icon_files');

		if ( !is_array($icon_files) ) {
			/**
			 * Filters the icon directory path.
			 *
			 * @since 2.0.0
			 *
			 * @param string $path Icon directory absolute path.
			 */
			$icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/media' );

			/**
			 * Filters the icon directory URI.
			 *
			 * @since 2.0.0
			 *
			 * @param string $uri Icon directory URI.
			 */
			$icon_dir_uri = apply_filters( 'icon_dir_uri', includes_url( 'images/media' ) );

			/**
			 * Filters the list of icon directory URIs.
			 *
			 * @since 2.5.0
			 *
			 * @param array $uris List of icon directory URIs.
			 */
			$dirs = apply_filters( 'icon_dirs', array( $icon_dir => $icon_dir_uri ) );
			$icon_files = array();
			while ( $dirs ) {
				$keys = array_keys( $dirs );
				$dir = array_shift( $keys );
				$uri = array_shift($dirs);
				if ( $dh = opendir($dir) ) {
					while ( false !== $file = readdir($dh) ) {
						$file = basename($file);
						if ( substr($file, 0, 1) == '.' )
							continue;
						if ( !in_array(strtolower(substr($file, -4)), array('.png', '.gif', '.jpg') ) ) {
							if ( is_dir("$dir/$file") )
								$dirs["$dir/$file"] = "$uri/$file";
							continue;
						}
						$icon_files["$dir/$file"] = "$uri/$file";
					}
					closedir($dh);
				}
			}
			wp_cache_add( 'icon_files', $icon_files, 'default', 600 );
		}

		$types = array();
		// Icon basename - extension = MIME wildcard.
		foreach ( $icon_files as $file => $uri )
			$types[ preg_replace('/^([^.]*).*$/', '$1', basename($file)) ] =& $icon_files[$file];

		if ( ! empty($mime) ) {
			$post_mimes[] = substr($mime, 0, strpos($mime, '/'));
			$post_mimes[] = substr($mime, strpos($mime, '/') + 1);
			$post_mimes[] = str_replace('/', '_', $mime);
		}

		$matches = wp_match_mime_types(array_keys($types), $post_mimes);
		$matches['default'] = array('default');

		foreach ( $matches as $match => $wilds ) {
			foreach ( $wilds as $wild ) {
				if ( ! isset( $types[ $wild ] ) ) {
					continue;
				}

				$icon = $types[ $wild ];
				if ( ! is_numeric( $mime ) ) {
					wp_cache_add( "mime_type_icon_$mime", $icon );
				}
				break 2;
			}
		}
	}

	/**
	 * Filters the mime type icon.
	 *
	 * @since 2.1.0
	 *
	 * @param string $icon    Path to the mime type icon.
	 * @param string $mime    Mime type.
	 * @param int    $post_id Attachment ID. Will equal 0 if the function passed
	 *                        the mime type.
	 */
	return apply_filters( 'wp_mime_type_icon', $icon, $mime, $post_id );
}

/**
 * Check for changed slugs for published post objects and save the old slug.
 *
 * The function is used when a post object of any type is updated,
 * by comparing the current and previous post objects.
 *
 * If the slug was changed and not already part of the old slugs then it will be
 * added to the post meta field ('_wp_old_slug') for storing old slugs for that
 * post.
 *
 * The most logically usage of this function is redirecting changed post objects, so
 * that those that linked to an changed post will be redirected to the new post.
 *
 * @since 2.1.0
 *
 * @param int     $post_id     Post ID.
 * @param WP_Post $post        The Post Object
 * @param WP_Post $post_before The Previous Post Object
 */
function wp_check_for_changed_slugs( $post_id, $post, $post_before ) {
	// Don't bother if it hasn't changed.
	if ( $post->post_name == $post_before->post_name ) {
		return;
	}

	// We're only concerned with published, non-hierarchical objects.
	if ( ! ( 'publish' === $post->post_status || ( 'attachment' === get_post_type( $post ) && 'inherit' === $post->post_status ) ) || is_post_type_hierarchical( $post->post_type ) ) {
		return;
	}

	$old_slugs = (array) get_post_meta( $post_id, '_wp_old_slug' );

	// If we haven't added this old slug before, add it now.
	if ( ! empty( $post_before->post_name ) && ! in_array( $post_before->post_name, $old_slugs ) ) {
		add_post_meta( $post_id, '_wp_old_slug', $post_before->post_name );
	}

	// If the new slug was used previously, delete it from the list.
	if ( in_array( $post->post_name, $old_slugs ) ) {
		delete_post_meta( $post_id, '_wp_old_slug', $post->post_name );
	}
}

/**
 * Check for changed dates for published post objects and save the old date.
 *
 * The function is used when a post object of any type is updated,
 * by comparing the current and previous post objects.
 *
 * If the date was changed and not already part of the old dates then it will be
 * added to the post meta field ('_wp_old_date') for storing old dates for that
 * post.
 *
 * The most logically usage of this function is redirecting changed post objects, so
 * that those that linked to an changed post will be redirected to the new post.
 *
 * @since 4.9.3
 *
 * @param int     $post_id     Post ID.
 * @param WP_Post $post        The Post Object
 * @param WP_Post $post_before The Previous Post Object
 */
function wp_check_for_changed_dates( $post_id, $post, $post_before ) {
	$previous_date = date( 'Y-m-d', strtotime( $post_before->post_date ) );
	$new_date = date( 'Y-m-d', strtotime( $post->post_date ) );
	// Don't bother if it hasn't changed.
	if ( $new_date == $previous_date ) {
		return;
	}
	// We're only concerned with published, non-hierarchical objects.
	if ( ! ( 'publish' === $post->post_status || ( 'attachment' === get_post_type( $post ) && 'inherit' === $post->post_status ) ) || is_post_type_hierarchical( $post->post_type ) ) {
		return;
	}
	$old_dates = (array) get_post_meta( $post_id, '_wp_old_date' );
	// If we haven't added this old date before, add it now.
	if ( ! empty( $previous_date ) && ! in_array( $previous_date, $old_dates ) ) {
		add_post_meta( $post_id, '_wp_old_date', $previous_date );
	}
	// If the new slug was used previously, delete it from the list.
	if ( in_array( $new_date, $old_dates ) ) {
		delete_post_meta( $post_id, '_wp_old_date', $new_date );
	}
}

/**
 * Retrieve the private post SQL based on capability.
 *
 * This function provides a standardized way to appropriately select on the
 * post_status of a post type. The function will return a piece of SQL code
 * that can be added to a WHERE clause; this SQL is constructed to allow all
 * published posts, and all private posts to which the user has access.
 *
 * @since 2.2.0
 * @since 4.3.0 Added the ability to pass an array to `$post_type`.
 *
 * @param string|array $post_type Single post type or an array of post types. Currently only supports 'post' or 'page'.
 * @return string SQL code that can be added to a where clause.
 */
function get_private_posts_cap_sql( $post_type ) {
	return get_posts_by_author_sql( $post_type, false );
}

/**
 * Retrieve the post SQL based on capability, author, and type.
 *
 * @since 3.0.0
 * @since 4.3.0 Introduced the ability to pass an array of post types to `$post_type`.
 *
 * @see get_private_posts_cap_sql()
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param array|string   $post_type   Single post type or an array of post types.
 * @param bool           $full        Optional. Returns a full WHERE statement instead of just
 *                                    an 'andalso' term. Default true.
 * @param int            $post_author Optional. Query posts having a single author ID. Default null.
 * @param bool           $public_only Optional. Only return public posts. Skips cap checks for
 *                                    $current_user.  Default false.
 * @return string SQL WHERE code that can be added to a query.
 */
function get_posts_by_author_sql( $post_type, $full = true, $post_author = null, $public_only = false ) {
	global $wpdb;

	if ( is_array( $post_type ) ) {
		$post_types = $post_type;
	} else {
		$post_types = array( $post_type );
	}

	$post_type_clauses = array();
	foreach ( $post_types as $post_type ) {
		$post_type_obj = get_post_type_object( $post_type );
		if ( ! $post_type_obj ) {
			continue;
		}

		/**
		 * Filters the capability to read private posts for a custom post type
		 * when generating SQL for getting posts by author.
		 *
		 * @since 2.2.0
		 * @deprecated 3.2.0 The hook transitioned from "somewhat useless" to "totally useless".
		 *
		 * @param string $cap Capability.
		 */
		if ( ! $cap = apply_filters( 'pub_priv_sql_capability', '' ) ) {
			$cap = current_user_can( $post_type_obj->cap->read_private_posts );
		}

		// Only need to check the cap if $public_only is false.
		$post_status_sql = "post_status = 'publish'";
		if ( false === $public_only ) {
			if ( $cap ) {
				// Does the user have the capability to view private posts? Guess so.
				$post_status_sql .= " OR post_status = 'private'";
			} elseif ( is_user_logged_in() ) {
				// Users can view their own private posts.
				$id = get_current_user_id();
				if ( null === $post_author || ! $full ) {
					$post_status_sql .= " OR post_status = 'private' AND post_author = $id";
				} elseif ( $id == (int) $post_author ) {
					$post_status_sql .= " OR post_status = 'private'";
				} // else none
			} // else none
		}

		$post_type_clauses[] = "( post_type = '" . $post_type . "' AND ( $post_status_sql ) )";
	}

	if ( empty( $post_type_clauses ) ) {
		return $full ? 'WHERE 1 = 0' : '1 = 0';
	}

	$sql = '( '. implode( ' OR ', $post_type_clauses ) . ' )';

	if ( null !== $post_author ) {
		$sql .= $wpdb->prepare( ' AND post_author = %d', $post_author );
	}

	if ( $full ) {
		$sql = 'WHERE ' . $sql;
	}

	return $sql;
}

/**
 * Retrieve the date that the last post was published.
 *
 * The server timezone is the default and is the difference between GMT and
 * server time. The 'blog' value is the date when the last post was posted. The
 * 'gmt' is when the last post was posted in GMT formatted date.
 *
 * @since 0.71
 * @since 4.4.0 The `$post_type` argument was added.
 *
 * @param string $timezone  Optional. The timezone for the timestamp. Accepts 'server', 'blog', or 'gmt'.
 *                          'server' uses the server's internal timezone.
 *                          'blog' uses the `post_modified` field, which proxies to the timezone set for the site.
 *                          'gmt' uses the `post_modified_gmt` field.
 *                          Default 'server'.
 * @param string $post_type Optional. The post type to check. Default 'any'.
 * @return string The date of the last post.
 */
function get_lastpostdate( $timezone = 'server', $post_type = 'any' ) {
	/**
	 * Filters the date the last post was published.
	 *
	 * @since 2.3.0
	 *
	 * @param string $date     Date the last post was published.
	 * @param string $timezone Location to use for getting the post published date.
	 *                         See get_lastpostdate() for accepted `$timezone` values.
	 */
	return apply_filters( 'get_lastpostdate', _get_last_post_time( $timezone, 'date', $post_type ), $timezone );
}

/**
 * Get the timestamp of the last time any post was modified.
 *
 * The server timezone is the default and is the difference between GMT and
 * server time. The 'blog' value is just when the last post was modified. The
 * 'gmt' is when the last post was modified in GMT time.
 *
 * @since 1.2.0
 * @since 4.4.0 The `$post_type` argument was added.
 *
 * @param string $timezone  Optional. The timezone for the timestamp. See get_lastpostdate()
 *                          for information on accepted values.
 *                          Default 'server'.
 * @param string $post_type Optional. The post type to check. Default 'any'.
 * @return string The timestamp.
 */
function get_lastpostmodified( $timezone = 'server', $post_type = 'any' ) {
	/**
	 * Pre-filter the return value of get_lastpostmodified() before the query is run.
	 *
	 * @since 4.4.0
	 *
	 * @param string $lastpostmodified Date the last post was modified.
	 *                                 Returning anything other than false will short-circuit the function.
	 * @param string $timezone         Location to use for getting the post modified date.
	 *                                 See get_lastpostdate() for accepted `$timezone` values.
	 * @param string $post_type        The post type to check.
	 */
	$lastpostmodified = apply_filters( 'pre_get_lastpostmodified', false, $timezone, $post_type );
	if ( false !== $lastpostmodified ) {
		return $lastpostmodified;
	}

	$lastpostmodified = _get_last_post_time( $timezone, 'modified', $post_type );

	$lastpostdate = get_lastpostdate($timezone);
	if ( $lastpostdate > $lastpostmodified ) {
		$lastpostmodified = $lastpostdate;
	}

	/**
	 * Filters the date the last post was modified.
	 *
	 * @since 2.3.0
	 *
	 * @param string $lastpostmodified Date the last post was modified.
	 * @param string $timezone         Location to use for getting the post modified date.
	 *                                 See get_lastpostdate() for accepted `$timezone` values.
	 */
	return apply_filters( 'get_lastpostmodified', $lastpostmodified, $timezone );
}

/**
 * Get the timestamp of the last time any post was modified or published.
 *
 * @since 3.1.0
 * @since 4.4.0 The `$post_type` argument was added.
 * @access private
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $timezone  The timezone for the timestamp. See get_lastpostdate().
 *                          for information on accepted values.
 * @param string $field     Post field to check. Accepts 'date' or 'modified'.
 * @param string $post_type Optional. The post type to check. Default 'any'.
 * @return string|false The timestamp.
 */
function _get_last_post_time( $timezone, $field, $post_type = 'any' ) {
	global $wpdb;

	if ( ! in_array( $field, array( 'date', 'modified' ) ) ) {
		return false;
	}

	$timezone = strtolower( $timezone );

	$key = "lastpost{$field}:$timezone";
	if ( 'any' !== $post_type ) {
		$key .= ':' . sanitize_key( $post_type );
	}

	$date = wp_cache_get( $key, 'timeinfo' );
	if ( false !== $date ) {
		return $date;
	}

	if ( 'any' === $post_type ) {
		$post_types = get_post_types( array( 'public' => true ) );
		array_walk( $post_types, array( $wpdb, 'escape_by_ref' ) );
		$post_types = "'" . implode( "', '", $post_types ) . "'";
	} else {
		$post_types = "'" . sanitize_key( $post_type ) . "'";
	}

	switch ( $timezone ) {
		case 'gmt':
			$date = $wpdb->get_var("SELECT post_{$field}_gmt FROM $wpdb->posts WHERE post_status = 'publish' AND post_type IN ({$post_types}) ORDER BY post_{$field}_gmt DESC LIMIT 1");
			break;
		case 'blog':
			$date = $wpdb->get_var("SELECT post_{$field} FROM $wpdb->posts WHERE post_status = 'publish' AND post_type IN ({$post_types}) ORDER BY post_{$field}_gmt DESC LIMIT 1");
			break;
		case 'server':
			$add_seconds_server = date( 'Z' );
			$date = $wpdb->get_var("SELECT DATE_ADD(post_{$field}_gmt, INTERVAL '$add_seconds_server' SECOND) FROM $wpdb->posts WHERE post_status = 'publish' AND post_type IN ({$post_types}) ORDER BY post_{$field}_gmt DESC LIMIT 1");
			break;
	}

	if ( $date ) {
		wp_cache_set( $key, $date, 'timeinfo' );

		return $date;
	}

	return false;
}

/**
 * Updates posts in cache.
 *
 * @since 1.5.1
 *
 * @param array $posts Array of post objects (passed by reference).
 */
function update_post_cache( &$posts ) {
	if ( ! $posts )
		return;

	foreach ( $posts as $post )
		wp_cache_add( $post->ID, $post, 'posts' );
}

/**
 * Will clean the post in the cache.
 *
 * Cleaning means delete from the cache of the post. Will call to clean the term
 * object cache associated with the post ID.
 *
 * This function not run if $_wp_suspend_cache_invalidation is not empty. See
 * wp_suspend_cache_invalidation().
 *
 * @since 2.0.0
 *
 * @global bool $_wp_suspend_cache_invalidation
 *
 * @param int|WP_Post $post Post ID or post object to remove from the cache.
 */
function clean_post_cache( $post ) {
	global $_wp_suspend_cache_invalidation;

	if ( ! empty( $_wp_suspend_cache_invalidation ) )
		return;

	$post = get_post( $post );
	if ( empty( $post ) )
		return;

	wp_cache_delete( $post->ID, 'posts' );
	wp_cache_delete( $post->ID, 'post_meta' );

	clean_object_term_cache( $post->ID, $post->post_type );

	wp_cache_delete( 'wp_get_archives', 'general' );

	/**
	 * Fires immediately after the given post's cache is cleaned.
	 *
	 * @since 2.5.0
	 *
	 * @param int     $post_id Post ID.
	 * @param WP_Post $post    Post object.
	 */
	do_action( 'clean_post_cache', $post->ID, $post );

	if ( 'page' == $post->post_type ) {
		wp_cache_delete( 'all_page_ids', 'posts' );

		/**
		 * Fires immediately after the given page's cache is cleaned.
		 *
		 * @since 2.5.0
		 *
		 * @param int $post_id Post ID.
		 */
		do_action( 'clean_page_cache', $post->ID );
	}

	wp_cache_set( 'last_changed', microtime(), 'posts' );
}

/**
 * Call major cache updating functions for list of Post objects.
 *
 * @since 1.5.0
 *
 * @param array  $posts             Array of Post objects
 * @param string $post_type         Optional. Post type. Default 'post'.
 * @param bool   $update_term_cache Optional. Whether to update the term cache. Default true.
 * @param bool   $update_meta_cache Optional. Whether to update the meta cache. Default true.
 */
function update_post_caches( &$posts, $post_type = 'post', $update_term_cache = true, $update_meta_cache = true ) {
	// No point in doing all this work if we didn't match any posts.
	if ( !$posts )
		return;

	update_post_cache($posts);

	$post_ids = array();
	foreach ( $posts as $post )
		$post_ids[] = $post->ID;

	if ( ! $post_type )
		$post_type = 'any';

	if ( $update_term_cache ) {
		if ( is_array($post_type) ) {
			$ptypes = $post_type;
		} elseif ( 'any' == $post_type ) {
			$ptypes = array();
			// Just use the post_types in the supplied posts.
			foreach ( $posts as $post ) {
				$ptypes[] = $post->post_type;
			}
			$ptypes = array_unique($ptypes);
		} else {
			$ptypes = array($post_type);
		}

		if ( ! empty($ptypes) )
			update_object_term_cache($post_ids, $ptypes);
	}

	if ( $update_meta_cache )
		update_postmeta_cache($post_ids);
}

/**
 * Updates metadata cache for list of post IDs.
 *
 * Performs SQL query to retrieve the metadata for the post IDs and updates the
 * metadata cache for the posts. Therefore, the functions, which call this
 * function, do not need to perform SQL queries on their own.
 *
 * @since 2.1.0
 *
 * @param array $post_ids List of post IDs.
 * @return array|false Returns false if there is nothing to update or an array
 *                     of metadata.
 */
function update_postmeta_cache( $post_ids ) {
	return update_meta_cache('post', $post_ids);
}

/**
 * Will clean the attachment in the cache.
 *
 * Cleaning means delete from the cache. Optionally will clean the term
 * object cache associated with the attachment ID.
 *
 * This function will not run if $_wp_suspend_cache_invalidation is not empty.
 *
 * @since 3.0.0
 *
 * @global bool $_wp_suspend_cache_invalidation
 *
 * @param int  $id          The attachment ID in the cache to clean.
 * @param bool $clean_terms Optional. Whether to clean terms cache. Default false.
 */
function clean_attachment_cache( $id, $clean_terms = false ) {
	global $_wp_suspend_cache_invalidation;

	if ( !empty($_wp_suspend_cache_invalidation) )
		return;

	$id = (int) $id;

	wp_cache_delete($id, 'posts');
	wp_cache_delete($id, 'post_meta');

	if ( $clean_terms )
		clean_object_term_cache($id, 'attachment');

	/**
	 * Fires after the given attachment's cache is cleaned.
	 *
	 * @since 3.0.0
	 *
	 * @param int $id Attachment ID.
	 */
	do_action( 'clean_attachment_cache', $id );
}

//
// Hooks
//

/**
 * Hook for managing future post transitions to published.
 *
 * @since 2.3.0
 * @access private
 *
 * @see wp_clear_scheduled_hook()
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string  $new_status New post status.
 * @param string  $old_status Previous post status.
 * @param WP_Post $post       Post object.
 */
function _transition_post_status( $new_status, $old_status, $post ) {
	global $wpdb;

	if ( $old_status != 'publish' && $new_status == 'publish' ) {
		// Reset GUID if transitioning to publish and it is empty.
		if ( '' == get_the_guid($post->ID) )
			$wpdb->update( $wpdb->posts, array( 'guid' => get_permalink( $post->ID ) ), array( 'ID' => $post->ID ) );

		/**
		 * Fires when a post's status is transitioned from private to published.
		 *
		 * @since 1.5.0
		 * @deprecated 2.3.0 Use 'private_to_publish' instead.
		 *
		 * @param int $post_id Post ID.
		 */
		do_action('private_to_published', $post->ID);
	}

	// If published posts changed clear the lastpostmodified cache.
	if ( 'publish' == $new_status || 'publish' == $old_status) {
		foreach ( array( 'server', 'gmt', 'blog' ) as $timezone ) {
			wp_cache_delete( "lastpostmodified:$timezone", 'timeinfo' );
			wp_cache_delete( "lastpostdate:$timezone", 'timeinfo' );
			wp_cache_delete( "lastpostdate:$timezone:{$post->post_type}", 'timeinfo' );
		}
	}

	if ( $new_status !== $old_status ) {
		wp_cache_delete( _count_posts_cache_key( $post->post_type ), 'counts' );
		wp_cache_delete( _count_posts_cache_key( $post->post_type, 'readable' ), 'counts' );
	}

	// Always clears the hook in case the post status bounced from future to draft.
	wp_clear_scheduled_hook('publish_future_post', array( $post->ID ) );
}

/**
 * Hook used to schedule publication for a post marked for the future.
 *
 * The $post properties used and must exist are 'ID' and 'post_date_gmt'.
 *
 * @since 2.3.0
 * @access private
 *
 * @param int     $deprecated Not used. Can be set to null. Never implemented. Not marked
 *                            as deprecated with _deprecated_argument() as it conflicts with
 *                            wp_transition_post_status() and the default filter for _future_post_hook().
 * @param WP_Post $post       Post object.
 */
function _future_post_hook( $deprecated, $post ) {
	wp_clear_scheduled_hook( 'publish_future_post', array( $post->ID ) );
	wp_schedule_single_event( strtotime( get_gmt_from_date( $post->post_date ) . ' GMT') , 'publish_future_post', array( $post->ID ) );
}

/**
 * Hook to schedule pings and enclosures when a post is published.
 *
 * Uses XMLRPC_REQUEST and WP_IMPORTING constants.
 *
 * @since 2.3.0
 * @access private
 *
 * @param int $post_id The ID in the database table of the post being published.
 */
function _publish_post_hook( $post_id ) {
	if ( defined( 'XMLRPC_REQUEST' ) ) {
		/**
		 * Fires when _publish_post_hook() is called during an XML-RPC request.
		 *
		 * @since 2.1.0
		 *
		 * @param int $post_id Post ID.
		 */
		do_action( 'xmlrpc_publish_post', $post_id );
	}

	if ( defined('WP_IMPORTING') )
		return;

	if ( get_option('default_pingback_flag') )
		add_post_meta( $post_id, '_pingme', '1' );
	add_post_meta( $post_id, '_encloseme', '1' );

	if ( ! wp_next_scheduled( 'do_pings' ) ) {
		wp_schedule_single_event( time(), 'do_pings' );
	}
}

/**
 * Return the post's parent's post_ID
 *
 * @since 3.1.0
 *
 * @param int $post_ID
 *
 * @return int|false Post parent ID, otherwise false.
 */
function wp_get_post_parent_id( $post_ID ) {
	$post = get_post( $post_ID );
	if ( !$post || is_wp_error( $post ) )
		return false;
	return (int) $post->post_parent;
}

/**
 * Check the given subset of the post hierarchy for hierarchy loops.
 *
 * Prevents loops from forming and breaks those that it finds. Attached
 * to the {@see 'wp_insert_post_parent'} filter.
 *
 * @since 3.1.0
 *
 * @see wp_find_hierarchy_loop()
 *
 * @param int $post_parent ID of the parent for the post we're checking.
 * @param int $post_ID     ID of the post we're checking.
 * @return int The new post_parent for the post, 0 otherwise.
 */
function wp_check_post_hierarchy_for_loops( $post_parent, $post_ID ) {
	// Nothing fancy here - bail.
	if ( !$post_parent )
		return 0;

	// New post can't cause a loop.
	if ( empty( $post_ID ) )
		return $post_parent;

	// Can't be its own parent.
	if ( $post_parent == $post_ID )
		return 0;

	// Now look for larger loops.
	if ( !$loop = wp_find_hierarchy_loop( 'wp_get_post_parent_id', $post_ID, $post_parent ) )
		return $post_parent; // No loop

	// Setting $post_parent to the given value causes a loop.
	if ( isset( $loop[$post_ID] ) )
		return 0;

	// There's a loop, but it doesn't contain $post_ID. Break the loop.
	foreach ( array_keys( $loop ) as $loop_member )
		wp_update_post( array( 'ID' => $loop_member, 'post_parent' => 0 ) );

	return $post_parent;
}

/**
 * Set a post thumbnail.
 *
 * @since 3.1.0
 *
 * @param int|WP_Post $post         Post ID or post object where thumbnail should be attached.
 * @param int         $thumbnail_id Thumbnail to attach.
 * @return int|bool True on success, false on failure.
 */
function set_post_thumbnail( $post, $thumbnail_id ) {
	$post = get_post( $post );
	$thumbnail_id = absint( $thumbnail_id );
	if ( $post && $thumbnail_id && get_post( $thumbnail_id ) ) {
		if ( wp_get_attachment_image( $thumbnail_id, 'thumbnail' ) )
			return update_post_meta( $post->ID, '_thumbnail_id', $thumbnail_id );
		else
			return delete_post_meta( $post->ID, '_thumbnail_id' );
	}
	return false;
}

/**
 * Remove a post thumbnail.
 *
 * @since 3.3.0
 *
 * @param int|WP_Post $post Post ID or post object where thumbnail should be removed from.
 * @return bool True on success, false on failure.
 */
function delete_post_thumbnail( $post ) {
	$post = get_post( $post );
	if ( $post )
		return delete_post_meta( $post->ID, '_thumbnail_id' );
	return false;
}

/**
 * Delete auto-drafts for new posts that are > 7 days old.
 *
 * @since 3.4.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 */
function wp_delete_auto_drafts() {
	global $wpdb;

	// Cleanup old auto-drafts more than 7 days old.
	$old_posts = $wpdb->get_col( "SELECT ID FROM $wpdb->posts WHERE post_status = 'auto-draft' AND DATE_SUB( NOW(), INTERVAL 7 DAY ) > post_date" );
	foreach ( (array) $old_posts as $delete ) {
		// Force delete.
		wp_delete_post( $delete, true );
	}
}

/**
 * Queues posts for lazy-loading of term meta.
 *
 * @since 4.5.0
 *
 * @param array $posts Array of WP_Post objects.
 */
function wp_queue_posts_for_term_meta_lazyload( $posts ) {
	$post_type_taxonomies = $term_ids = array();
	foreach ( $posts as $post ) {
		if ( ! ( $post instanceof WP_Post ) ) {
			continue;
		}

		if ( ! isset( $post_type_taxonomies[ $post->post_type ] ) ) {
			$post_type_taxonomies[ $post->post_type ] = get_object_taxonomies( $post->post_type );
		}

		foreach ( $post_type_taxonomies[ $post->post_type ] as $taxonomy ) {
			// Term cache should already be primed by `update_post_term_cache()`.
			$terms = get_object_term_cache( $post->ID, $taxonomy );
			if ( false !== $terms ) {
				foreach ( $terms as $term ) {
					if ( ! isset( $term_ids[ $term->term_id ] ) ) {
						$term_ids[] = $term->term_id;
					}
				}
			}
		}
	}

	if ( $term_ids ) {
		$lazyloader = wp_metadata_lazyloader();
		$lazyloader->queue_objects( 'term', $term_ids );
	}
}

/**
 * Update the custom taxonomies' term counts when a post's status is changed.
 *
 * For example, default posts term counts (for custom taxonomies) don't include
 * private / draft posts.
 *
 * @since 3.3.0
 * @access private
 *
 * @param string  $new_status New post status.
 * @param string  $old_status Old post status.
 * @param WP_Post $post       Post object.
 */
function _update_term_count_on_transition_post_status( $new_status, $old_status, $post ) {
	// Update counts for the post's terms.
	foreach ( (array) get_object_taxonomies( $post->post_type ) as $taxonomy ) {
		$tt_ids = wp_get_object_terms( $post->ID, $taxonomy, array( 'fields' => 'tt_ids' ) );
		wp_update_term_count( $tt_ids, $taxonomy );
	}
}

/**
 * Adds any posts from the given ids to the cache that do not already exist in cache
 *
 * @since 3.4.0
 * @access private
 *
 * @see update_post_caches()
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param array $ids               ID list.
 * @param bool  $update_term_cache Optional. Whether to update the term cache. Default true.
 * @param bool  $update_meta_cache Optional. Whether to update the meta cache. Default true.
 */
function _prime_post_caches( $ids, $update_term_cache = true, $update_meta_cache = true ) {
	global $wpdb;

	$non_cached_ids = _get_non_cached_ids( $ids, 'posts' );
	if ( !empty( $non_cached_ids ) ) {
		$fresh_posts = $wpdb->get_results( sprintf( "SELECT $wpdb->posts.* FROM $wpdb->posts WHERE ID IN (%s)", join( ",", $non_cached_ids ) ) );

		update_post_caches( $fresh_posts, 'any', $update_term_cache, $update_meta_cache );
	}
}

/**
 * Adds a suffix if any trashed posts have a given slug.
 *
 * Store its desired (i.e. current) slug so it can try to reclaim it
 * if the post is untrashed.
 *
 * For internal use.
 *
 * @since 4.5.0
 * @access private
 *
 * @param string $post_name Slug.
 * @param string $post_ID   Optional. Post ID that should be ignored. Default 0.
 */
function wp_add_trashed_suffix_to_post_name_for_trashed_posts( $post_name, $post_ID = 0 ) {
	$trashed_posts_with_desired_slug = get_posts( array(
		'name' => $post_name,
		'post_status' => 'trash',
		'post_type' => 'any',
		'nopaging' => true,
		'post__not_in' => array( $post_ID )
	) );

	if ( ! empty( $trashed_posts_with_desired_slug ) ) {
		foreach ( $trashed_posts_with_desired_slug as $_post ) {
			wp_add_trashed_suffix_to_post_name_for_post( $_post );
		}
	}
}

/**
 * Adds a trashed suffix for a given post.
 *
 * Store its desired (i.e. current) slug so it can try to reclaim it
 * if the post is untrashed.
 *
 * For internal use.
 *
 * @since 4.5.0
 * @access private
 *
 * @param WP_Post $post The post.
 * @return string New slug for the post.
 */
function wp_add_trashed_suffix_to_post_name_for_post( $post ) {
	global $wpdb;

	$post = get_post( $post );

	if ( '__trashed' === substr( $post->post_name, -9 ) ) {
		return $post->post_name;
	}
	add_post_meta( $post->ID, '_wp_desired_post_slug', $post->post_name );
	$post_name = _truncate_post_slug( $post->post_name, 191 ) . '__trashed';
	$wpdb->update( $wpdb->posts, array( 'post_name' => $post_name ), array( 'ID' => $post->ID ) );
	clean_post_cache( $post->ID );
	return $post_name;
}

/**
 * Filter the SQL clauses of an attachment query to include filenames.
 *
 * @since 4.7.0
 * @access private
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param array $clauses An array including WHERE, GROUP BY, JOIN, ORDER BY,
 *                       DISTINCT, fields (SELECT), and LIMITS clauses.
 * @return array The modified clauses.
 */
function _filter_query_attachment_filenames( $clauses ) {
	global $wpdb;
	remove_filter( 'posts_clauses', __FUNCTION__ );

	// Add a LEFT JOIN of the postmeta table so we don't trample existing JOINs.
	$clauses['join'] .= " LEFT JOIN {$wpdb->postmeta} AS sq1 ON ( {$wpdb->posts}.ID = sq1.post_id AND sq1.meta_key = '_wp_attached_file' )";

	$clauses['groupby'] = "{$wpdb->posts}.ID";

	$clauses['where'] = preg_replace(
		"/\({$wpdb->posts}.post_content (NOT LIKE|LIKE) (\'[^']+\')\)/",
		"$0 OR ( sq1.meta_value $1 $2 )",
		$clauses['where'] );

	return $clauses;
}

/**
 * Sets the last changed time for the 'posts' cache group.
 *
 * @since 5.0.0
 */
function wp_cache_set_posts_last_changed() {
	wp_cache_set( 'last_changed', microtime(), 'posts' );
}
home/xbodynamge/namtation/wp-admin/post.php000060400000022563151120133240015031 0ustar00<?php
/**
 * Edit post administration panel.
 *
 * Manage Post actions: post, edit, delete, etc.
 *
 * @package WordPress
 * @subpackage Administration
 */

/** WordPress Administration Bootstrap */
require_once( dirname( __FILE__ ) . '/admin.php' );

$parent_file  = 'edit.php';
$submenu_file = 'edit.php';

wp_reset_vars( array( 'action' ) );

if ( isset( $_GET['post'] ) && isset( $_POST['post_ID'] ) && (int) $_GET['post'] !== (int) $_POST['post_ID'] ) {
	wp_die( __( 'A post ID mismatch has been detected.' ), __( 'Sorry, you are not allowed to edit this item.' ), 400 );
} elseif ( isset( $_GET['post'] ) ) {
	$post_id = $post_ID = (int) $_GET['post'];
} elseif ( isset( $_POST['post_ID'] ) ) {
	$post_id = $post_ID = (int) $_POST['post_ID'];
} else {
	$post_id = $post_ID = 0;
}

/**
 * @global string  $post_type
 * @global object  $post_type_object
 * @global WP_Post $post
 */
global $post_type, $post_type_object, $post;

if ( $post_id ) {
	$post = get_post( $post_id );
}

if ( $post ) {
	$post_type        = $post->post_type;
	$post_type_object = get_post_type_object( $post_type );
}

if ( isset( $_POST['post_type'] ) && $post && $post_type !== $_POST['post_type'] ) {
	wp_die( __( 'A post type mismatch has been detected.' ), __( 'Sorry, you are not allowed to edit this item.' ), 400 );
}

if ( isset( $_POST['deletepost'] ) ) {
	$action = 'delete';
} elseif ( isset( $_POST['wp-preview'] ) && 'dopreview' == $_POST['wp-preview'] ) {
	$action = 'preview';
}

$sendback = wp_get_referer();
if ( ! $sendback ||
	 strpos( $sendback, 'post.php' ) !== false ||
	 strpos( $sendback, 'post-new.php' ) !== false ) {
	if ( 'attachment' == $post_type ) {
		$sendback = admin_url( 'upload.php' );
	} else {
		$sendback = admin_url( 'edit.php' );
		if ( ! empty( $post_type ) ) {
			$sendback = add_query_arg( 'post_type', $post_type, $sendback );
		}
	}
} else {
	$sendback = remove_query_arg( array( 'trashed', 'untrashed', 'deleted', 'ids' ), $sendback );
}

switch ( $action ) {
	case 'post-quickdraft-save':
		// Check nonce and capabilities
		$nonce     = $_REQUEST['_wpnonce'];
		$error_msg = false;

		// For output of the quickdraft dashboard widget
		require_once ABSPATH . 'wp-admin/includes/dashboard.php';

		if ( ! wp_verify_nonce( $nonce, 'add-post' ) ) {
			$error_msg = __( 'Unable to submit this form, please refresh and try again.' );
		}

		if ( ! current_user_can( get_post_type_object( 'post' )->cap->create_posts ) ) {
			exit;
		}

		if ( $error_msg ) {
			return wp_dashboard_quick_press( $error_msg );
		}

		$post = get_post( $_REQUEST['post_ID'] );
		check_admin_referer( 'add-' . $post->post_type );

		$_POST['comment_status'] = get_default_comment_status( $post->post_type );
		$_POST['ping_status']    = get_default_comment_status( $post->post_type, 'pingback' );

		edit_post();
		wp_dashboard_quick_press();
		exit;

	case 'postajaxpost':
	case 'post':
		check_admin_referer( 'add-' . $post_type );
		$post_id = 'postajaxpost' == $action ? edit_post() : write_post();
		redirect_post( $post_id );
		exit();

	case 'edit':
		$editing = true;

		if ( empty( $post_id ) ) {
			wp_redirect( admin_url( 'post.php' ) );
			exit();
		}

		if ( ! $post ) {
			wp_die( __( 'You attempted to edit an item that doesn&#8217;t exist. Perhaps it was deleted?' ) );
		}

		if ( ! $post_type_object ) {
			wp_die( __( 'Invalid post type.' ) );
		}

		if ( ! in_array( $typenow, get_post_types( array( 'show_ui' => true ) ) ) ) {
			wp_die( __( 'Sorry, you are not allowed to edit posts in this post type.' ) );
		}

		if ( ! current_user_can( 'edit_post', $post_id ) ) {
			wp_die( __( 'Sorry, you are not allowed to edit this item.' ) );
		}

		if ( 'trash' == $post->post_status ) {
			wp_die( __( 'You can&#8217;t edit this item because it is in the Trash. Please restore it and try again.' ) );
		}

		if ( ! empty( $_GET['get-post-lock'] ) ) {
			check_admin_referer( 'lock-post_' . $post_id );
			wp_set_post_lock( $post_id );
			wp_redirect( get_edit_post_link( $post_id, 'url' ) );
			exit();
		}

		$post_type = $post->post_type;
		if ( 'post' == $post_type ) {
			$parent_file   = 'edit.php';
			$submenu_file  = 'edit.php';
			$post_new_file = 'post-new.php';
		} elseif ( 'attachment' == $post_type ) {
			$parent_file   = 'upload.php';
			$submenu_file  = 'upload.php';
			$post_new_file = 'media-new.php';
		} else {
			if ( isset( $post_type_object ) && $post_type_object->show_in_menu && $post_type_object->show_in_menu !== true ) {
				$parent_file = $post_type_object->show_in_menu;
			} else {
				$parent_file = "edit.php?post_type=$post_type";
			}
			$submenu_file  = "edit.php?post_type=$post_type";
			$post_new_file = "post-new.php?post_type=$post_type";
		}

		$title = $post_type_object->labels->edit_item;

		/**
		 * Allows replacement of the editor.
		 *
		 * @since 4.9.0
		 *
		 * @param boolean      Whether to replace the editor. Default false.
		 * @param object $post Post object.
		 */
		if ( apply_filters( 'replace_editor', false, $post ) === true ) {
			break;
		}

		if ( use_block_editor_for_post( $post ) ) {
			include( ABSPATH . 'wp-admin/edit-form-blocks.php' );
			break;
		}

		if ( ! wp_check_post_lock( $post->ID ) ) {
			$active_post_lock = wp_set_post_lock( $post->ID );

			if ( 'attachment' !== $post_type ) {
				wp_enqueue_script( 'autosave' );
			}
		}

		$post = get_post( $post_id, OBJECT, 'edit' );

		if ( post_type_supports( $post_type, 'comments' ) ) {
			wp_enqueue_script( 'admin-comments' );
			enqueue_comment_hotkeys_js();
		}

		include( ABSPATH . 'wp-admin/edit-form-advanced.php' );

		break;

	case 'editattachment':
		check_admin_referer( 'update-post_' . $post_id );

		// Don't let these be changed
		unset( $_POST['guid'] );
		$_POST['post_type'] = 'attachment';

		// Update the thumbnail filename
		$newmeta          = wp_get_attachment_metadata( $post_id, true );
		$newmeta['thumb'] = wp_basename( $_POST['thumb'] );

		wp_update_attachment_metadata( $post_id, $newmeta );

		// Intentional fall-through to trigger the edit_post() call.
	case 'editpost':
		check_admin_referer( 'update-post_' . $post_id );

		$post_id = edit_post();

		// Session cookie flag that the post was saved
		if ( isset( $_COOKIE['wp-saving-post'] ) && $_COOKIE['wp-saving-post'] === $post_id . '-check' ) {
			setcookie( 'wp-saving-post', $post_id . '-saved', time() + DAY_IN_SECONDS, ADMIN_COOKIE_PATH, COOKIE_DOMAIN, is_ssl() );
		}

		redirect_post( $post_id ); // Send user on their way while we keep working

		exit();

	case 'trash':
		check_admin_referer( 'trash-post_' . $post_id );

		if ( ! $post ) {
			wp_die( __( 'The item you are trying to move to the Trash no longer exists.' ) );
		}

		if ( ! $post_type_object ) {
			wp_die( __( 'Invalid post type.' ) );
		}

		if ( ! current_user_can( 'delete_post', $post_id ) ) {
			wp_die( __( 'Sorry, you are not allowed to move this item to the Trash.' ) );
		}

		if ( $user_id = wp_check_post_lock( $post_id ) ) {
			$user = get_userdata( $user_id );
			wp_die( sprintf( __( 'You cannot move this item to the Trash. %s is currently editing.' ), $user->display_name ) );
		}

		if ( ! wp_trash_post( $post_id ) ) {
			wp_die( __( 'Error in moving to Trash.' ) );
		}

		wp_redirect(
			add_query_arg(
				array(
					'trashed' => 1,
					'ids'     => $post_id,
				),
				$sendback
			)
		);
		exit();

	case 'untrash':
		check_admin_referer( 'untrash-post_' . $post_id );

		if ( ! $post ) {
			wp_die( __( 'The item you are trying to restore from the Trash no longer exists.' ) );
		}

		if ( ! $post_type_object ) {
			wp_die( __( 'Invalid post type.' ) );
		}

		if ( ! current_user_can( 'delete_post', $post_id ) ) {
			wp_die( __( 'Sorry, you are not allowed to restore this item from the Trash.' ) );
		}

		if ( ! wp_untrash_post( $post_id ) ) {
			wp_die( __( 'Error in restoring from Trash.' ) );
		}

		wp_redirect( add_query_arg( 'untrashed', 1, $sendback ) );
		exit();

	case 'delete':
		check_admin_referer( 'delete-post_' . $post_id );

		if ( ! $post ) {
			wp_die( __( 'This item has already been deleted.' ) );
		}

		if ( ! $post_type_object ) {
			wp_die( __( 'Invalid post type.' ) );
		}

		if ( ! current_user_can( 'delete_post', $post_id ) ) {
			wp_die( __( 'Sorry, you are not allowed to delete this item.' ) );
		}

		if ( $post->post_type == 'attachment' ) {
			$force = ( ! MEDIA_TRASH );
			if ( ! wp_delete_attachment( $post_id, $force ) ) {
				wp_die( __( 'Error in deleting.' ) );
			}
		} else {
			if ( ! wp_delete_post( $post_id, true ) ) {
				wp_die( __( 'Error in deleting.' ) );
			}
		}

		wp_redirect( add_query_arg( 'deleted', 1, $sendback ) );
		exit();

	case 'preview':
		check_admin_referer( 'update-post_' . $post_id );

		$url = post_preview();

		wp_redirect( $url );
		exit();

	case 'toggle-custom-fields':
		check_admin_referer( 'toggle-custom-fields' );

		$current_user_id = get_current_user_id();
		if ( $current_user_id ) {
			$enable_custom_fields = (bool) get_user_meta( $current_user_id, 'enable_custom_fields', true );
			update_user_meta( $current_user_id, 'enable_custom_fields', ! $enable_custom_fields );
		}

		wp_safe_redirect( wp_get_referer() );
		exit();

	default:
		/**
		 * Fires for a given custom post action request.
		 *
		 * The dynamic portion of the hook name, `$action`, refers to the custom post action.
		 *
		 * @since 4.6.0
		 *
		 * @param int $post_id Post ID sent with the request.
		 */
		do_action( "post_action_{$action}", $post_id );

		wp_redirect( admin_url( 'edit.php' ) );
		exit();
} // end switch
include( ABSPATH . 'wp-admin/admin-footer.php' );
home/xbodynamge/www/wp-admin/includes/post.php000064400000214374151122322520015503 0ustar00<?php
/**
 * WordPress Post Administration API.
 *
 * @package WordPress
 * @subpackage Administration
 */

/**
 * Rename $_POST data from form names to DB post columns.
 *
 * Manipulates $_POST directly.
 *
 * @since 2.6.0
 *
 * @param bool $update Are we updating a pre-existing post?
 * @param array $post_data Array of post data. Defaults to the contents of $_POST.
 * @return object|bool WP_Error on failure, true on success.
 */
function _wp_translate_postdata( $update = false, $post_data = null ) {

	if ( empty($post_data) )
		$post_data = &$_POST;

	if ( $update )
		$post_data['ID'] = (int) $post_data['post_ID'];

	$ptype = get_post_type_object( $post_data['post_type'] );

	if ( $update && ! current_user_can( 'edit_post', $post_data['ID'] ) ) {
		if ( 'page' == $post_data['post_type'] )
			return new WP_Error( 'edit_others_pages', __( 'Sorry, you are not allowed to edit pages as this user.' ) );
		else
			return new WP_Error( 'edit_others_posts', __( 'Sorry, you are not allowed to edit posts as this user.' ) );
	} elseif ( ! $update && ! current_user_can( $ptype->cap->create_posts ) ) {
		if ( 'page' == $post_data['post_type'] )
			return new WP_Error( 'edit_others_pages', __( 'Sorry, you are not allowed to create pages as this user.' ) );
		else
			return new WP_Error( 'edit_others_posts', __( 'Sorry, you are not allowed to create posts as this user.' ) );
	}

	if ( isset( $post_data['content'] ) )
		$post_data['post_content'] = $post_data['content'];

	if ( isset( $post_data['excerpt'] ) )
		$post_data['post_excerpt'] = $post_data['excerpt'];

	if ( isset( $post_data['parent_id'] ) )
		$post_data['post_parent'] = (int) $post_data['parent_id'];

	if ( isset($post_data['trackback_url']) )
		$post_data['to_ping'] = $post_data['trackback_url'];

	$post_data['user_ID'] = get_current_user_id();

	if (!empty ( $post_data['post_author_override'] ) ) {
		$post_data['post_author'] = (int) $post_data['post_author_override'];
	} else {
		if (!empty ( $post_data['post_author'] ) ) {
			$post_data['post_author'] = (int) $post_data['post_author'];
		} else {
			$post_data['post_author'] = (int) $post_data['user_ID'];
		}
	}

	if ( isset( $post_data['user_ID'] ) && ( $post_data['post_author'] != $post_data['user_ID'] )
		 && ! current_user_can( $ptype->cap->edit_others_posts ) ) {
		if ( $update ) {
			if ( 'page' == $post_data['post_type'] )
				return new WP_Error( 'edit_others_pages', __( 'Sorry, you are not allowed to edit pages as this user.' ) );
			else
				return new WP_Error( 'edit_others_posts', __( 'Sorry, you are not allowed to edit posts as this user.' ) );
		} else {
			if ( 'page' == $post_data['post_type'] )
				return new WP_Error( 'edit_others_pages', __( 'Sorry, you are not allowed to create pages as this user.' ) );
			else
				return new WP_Error( 'edit_others_posts', __( 'Sorry, you are not allowed to create posts as this user.' ) );
		}
	}

	if ( ! empty( $post_data['post_status'] ) ) {
		$post_data['post_status'] = sanitize_key( $post_data['post_status'] );

		// No longer an auto-draft
		if ( 'auto-draft' === $post_data['post_status'] ) {
			$post_data['post_status'] = 'draft';
		}

		if ( ! get_post_status_object( $post_data['post_status'] ) ) {
			unset( $post_data['post_status'] );
		}
	}

	// What to do based on which button they pressed
	if ( isset($post_data['saveasdraft']) && '' != $post_data['saveasdraft'] )
		$post_data['post_status'] = 'draft';
	if ( isset($post_data['saveasprivate']) && '' != $post_data['saveasprivate'] )
		$post_data['post_status'] = 'private';
	if ( isset($post_data['publish']) && ( '' != $post_data['publish'] ) && ( !isset($post_data['post_status']) || $post_data['post_status'] != 'private' ) )
		$post_data['post_status'] = 'publish';
	if ( isset($post_data['advanced']) && '' != $post_data['advanced'] )
		$post_data['post_status'] = 'draft';
	if ( isset($post_data['pending']) && '' != $post_data['pending'] )
		$post_data['post_status'] = 'pending';

	if ( isset( $post_data['ID'] ) )
		$post_id = $post_data['ID'];
	else
		$post_id = false;
	$previous_status = $post_id ? get_post_field( 'post_status', $post_id ) : false;

	if ( isset( $post_data['post_status'] ) && 'private' == $post_data['post_status'] && ! current_user_can( $ptype->cap->publish_posts ) ) {
		$post_data['post_status'] = $previous_status ? $previous_status : 'pending';
	}

	$published_statuses = array( 'publish', 'future' );

	// Posts 'submitted for approval' present are submitted to $_POST the same as if they were being published.
	// Change status from 'publish' to 'pending' if user lacks permissions to publish or to resave published posts.
	if ( isset($post_data['post_status']) && (in_array( $post_data['post_status'], $published_statuses ) && !current_user_can( $ptype->cap->publish_posts )) )
		if ( ! in_array( $previous_status, $published_statuses ) || !current_user_can( 'edit_post', $post_id ) )
			$post_data['post_status'] = 'pending';

	if ( ! isset( $post_data['post_status'] ) ) {
		$post_data['post_status'] = 'auto-draft' === $previous_status ? 'draft' : $previous_status;
	}

	if ( isset( $post_data['post_password'] ) && ! current_user_can( $ptype->cap->publish_posts ) ) {
		unset( $post_data['post_password'] );
	}

	if (!isset( $post_data['comment_status'] ))
		$post_data['comment_status'] = 'closed';

	if (!isset( $post_data['ping_status'] ))
		$post_data['ping_status'] = 'closed';

	foreach ( array('aa', 'mm', 'jj', 'hh', 'mn') as $timeunit ) {
		if ( !empty( $post_data['hidden_' . $timeunit] ) && $post_data['hidden_' . $timeunit] != $post_data[$timeunit] ) {
			$post_data['edit_date'] = '1';
			break;
		}
	}

	if ( !empty( $post_data['edit_date'] ) ) {
		$aa = $post_data['aa'];
		$mm = $post_data['mm'];
		$jj = $post_data['jj'];
		$hh = $post_data['hh'];
		$mn = $post_data['mn'];
		$ss = $post_data['ss'];
		$aa = ($aa <= 0 ) ? date('Y') : $aa;
		$mm = ($mm <= 0 ) ? date('n') : $mm;
		$jj = ($jj > 31 ) ? 31 : $jj;
		$jj = ($jj <= 0 ) ? date('j') : $jj;
		$hh = ($hh > 23 ) ? $hh -24 : $hh;
		$mn = ($mn > 59 ) ? $mn -60 : $mn;
		$ss = ($ss > 59 ) ? $ss -60 : $ss;
		$post_data['post_date'] = sprintf( "%04d-%02d-%02d %02d:%02d:%02d", $aa, $mm, $jj, $hh, $mn, $ss );
		$valid_date = wp_checkdate( $mm, $jj, $aa, $post_data['post_date'] );
		if ( !$valid_date ) {
			return new WP_Error( 'invalid_date', __( 'Invalid date.' ) );
		}
		$post_data['post_date_gmt'] = get_gmt_from_date( $post_data['post_date'] );
	}

	if ( isset( $post_data['post_category'] ) ) {
		$category_object = get_taxonomy( 'category' );
		if ( ! current_user_can( $category_object->cap->assign_terms ) ) {
			unset( $post_data['post_category'] );
		}
	}

	return $post_data;
}

/**
 * Returns only allowed post data fields
 *
 * @since 4.9.9
 *
 * @param array $post_data Array of post data. Defaults to the contents of $_POST.
 * @return object|bool WP_Error on failure, true on success.
 */
function _wp_get_allowed_postdata( $post_data = null ) {
	if ( empty( $post_data ) ) {
		$post_data = $_POST;
	}

	// Pass through errors
	if ( is_wp_error( $post_data ) ) {
		return $post_data;
	}

	return array_diff_key( $post_data, array_flip( array( 'meta_input', 'file', 'guid' ) ) );
}

/**
 * Update an existing post with values provided in $_POST.
 *
 * @since 1.5.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param array $post_data Optional.
 * @return int Post ID.
 */
function edit_post( $post_data = null ) {
	global $wpdb;

	if ( empty($post_data) )
		$post_data = &$_POST;

	// Clear out any data in internal vars.
	unset( $post_data['filter'] );

	$post_ID = (int) $post_data['post_ID'];
	$post = get_post( $post_ID );
	$post_data['post_type'] = $post->post_type;
	$post_data['post_mime_type'] = $post->post_mime_type;

	if ( ! empty( $post_data['post_status'] ) ) {
		$post_data['post_status'] = sanitize_key( $post_data['post_status'] );

		if ( 'inherit' == $post_data['post_status'] ) {
			unset( $post_data['post_status'] );
		}
	}

	$ptype = get_post_type_object($post_data['post_type']);
	if ( !current_user_can( 'edit_post', $post_ID ) ) {
		if ( 'page' == $post_data['post_type'] )
			wp_die( __('Sorry, you are not allowed to edit this page.' ));
		else
			wp_die( __('Sorry, you are not allowed to edit this post.' ));
	}

	if ( post_type_supports( $ptype->name, 'revisions' ) ) {
		$revisions = wp_get_post_revisions( $post_ID, array( 'order' => 'ASC', 'posts_per_page' => 1 ) );
		$revision = current( $revisions );

		// Check if the revisions have been upgraded
		if ( $revisions && _wp_get_post_revision_version( $revision ) < 1 )
			_wp_upgrade_revisions_of_post( $post, wp_get_post_revisions( $post_ID ) );
	}

	if ( isset($post_data['visibility']) ) {
		switch ( $post_data['visibility'] ) {
			case 'public' :
				$post_data['post_password'] = '';
				break;
			case 'password' :
				unset( $post_data['sticky'] );
				break;
			case 'private' :
				$post_data['post_status'] = 'private';
				$post_data['post_password'] = '';
				unset( $post_data['sticky'] );
				break;
		}
	}

	$post_data = _wp_translate_postdata( true, $post_data );
	if ( is_wp_error($post_data) )
		wp_die( $post_data->get_error_message() );
	$translated = _wp_get_allowed_postdata( $post_data );

	// Post Formats
	if ( isset( $post_data['post_format'] ) )
		set_post_format( $post_ID, $post_data['post_format'] );

	$format_meta_urls = array( 'url', 'link_url', 'quote_source_url' );
	foreach ( $format_meta_urls as $format_meta_url ) {
		$keyed = '_format_' . $format_meta_url;
		if ( isset( $post_data[ $keyed ] ) )
			update_post_meta( $post_ID, $keyed, wp_slash( esc_url_raw( wp_unslash( $post_data[ $keyed ] ) ) ) );
	}

	$format_keys = array( 'quote', 'quote_source_name', 'image', 'gallery', 'audio_embed', 'video_embed' );

	foreach ( $format_keys as $key ) {
		$keyed = '_format_' . $key;
		if ( isset( $post_data[ $keyed ] ) ) {
			if ( current_user_can( 'unfiltered_html' ) )
				update_post_meta( $post_ID, $keyed, $post_data[ $keyed ] );
			else
				update_post_meta( $post_ID, $keyed, wp_filter_post_kses( $post_data[ $keyed ] ) );
		}
	}

	if ( 'attachment' === $post_data['post_type'] && preg_match( '#^(audio|video)/#', $post_data['post_mime_type'] ) ) {
		$id3data = wp_get_attachment_metadata( $post_ID );
		if ( ! is_array( $id3data ) ) {
			$id3data = array();
		}

		foreach ( wp_get_attachment_id3_keys( $post, 'edit' ) as $key => $label ) {
			if ( isset( $post_data[ 'id3_' . $key ] ) ) {
				$id3data[ $key ] = sanitize_text_field( wp_unslash( $post_data[ 'id3_' . $key ] ) );
			}
		}
		wp_update_attachment_metadata( $post_ID, $id3data );
	}

	// Meta Stuff
	if ( isset($post_data['meta']) && $post_data['meta'] ) {
		foreach ( $post_data['meta'] as $key => $value ) {
			if ( !$meta = get_post_meta_by_id( $key ) )
				continue;
			if ( $meta->post_id != $post_ID )
				continue;
			if ( is_protected_meta( $meta->meta_key, 'post' ) || ! current_user_can( 'edit_post_meta', $post_ID, $meta->meta_key ) )
				continue;
			if ( is_protected_meta( $value['key'], 'post' ) || ! current_user_can( 'edit_post_meta', $post_ID, $value['key'] ) )
				continue;
			update_meta( $key, $value['key'], $value['value'] );
		}
	}

	if ( isset($post_data['deletemeta']) && $post_data['deletemeta'] ) {
		foreach ( $post_data['deletemeta'] as $key => $value ) {
			if ( !$meta = get_post_meta_by_id( $key ) )
				continue;
			if ( $meta->post_id != $post_ID )
				continue;
			if ( is_protected_meta( $meta->meta_key, 'post' ) || ! current_user_can( 'delete_post_meta', $post_ID, $meta->meta_key ) )
				continue;
			delete_meta( $key );
		}
	}

	// Attachment stuff
	if ( 'attachment' == $post_data['post_type'] ) {
		if ( isset( $post_data[ '_wp_attachment_image_alt' ] ) ) {
			$image_alt = wp_unslash( $post_data['_wp_attachment_image_alt'] );
			if ( $image_alt != get_post_meta( $post_ID, '_wp_attachment_image_alt', true ) ) {
				$image_alt = wp_strip_all_tags( $image_alt, true );
				// update_meta expects slashed.
				update_post_meta( $post_ID, '_wp_attachment_image_alt', wp_slash( $image_alt ) );
			}
		}

		$attachment_data = isset( $post_data['attachments'][ $post_ID ] ) ? $post_data['attachments'][ $post_ID ] : array();

		/** This filter is documented in wp-admin/includes/media.php */
		$translated = apply_filters( 'attachment_fields_to_save', $translated, $attachment_data );
	}

	// Convert taxonomy input to term IDs, to avoid ambiguity.
	if ( isset( $post_data['tax_input'] ) ) {
		foreach ( (array) $post_data['tax_input'] as $taxonomy => $terms ) {
			// Hierarchical taxonomy data is already sent as term IDs, so no conversion is necessary.
			if ( is_taxonomy_hierarchical( $taxonomy ) ) {
				continue;
			}

			/*
			 * Assume that a 'tax_input' string is a comma-separated list of term names.
			 * Some languages may use a character other than a comma as a delimiter, so we standardize on
			 * commas before parsing the list.
			 */
			if ( ! is_array( $terms ) ) {
				$comma = _x( ',', 'tag delimiter' );
				if ( ',' !== $comma ) {
					$terms = str_replace( $comma, ',', $terms );
				}
				$terms = explode( ',', trim( $terms, " \n\t\r\0\x0B," ) );
			}

			$clean_terms = array();
			foreach ( $terms as $term ) {
				// Empty terms are invalid input.
				if ( empty( $term ) ) {
					continue;
				}

				$_term = get_terms( $taxonomy, array(
					'name' => $term,
					'fields' => 'ids',
					'hide_empty' => false,
				) );

				if ( ! empty( $_term ) ) {
					$clean_terms[] = intval( $_term[0] );
				} else {
					// No existing term was found, so pass the string. A new term will be created.
					$clean_terms[] = $term;
				}
			}

			$translated['tax_input'][ $taxonomy ] = $clean_terms;
		}
	}

	add_meta( $post_ID );

	update_post_meta( $post_ID, '_edit_last', get_current_user_id() );

	$success = wp_update_post( $translated );
	// If the save failed, see if we can sanity check the main fields and try again
	if ( ! $success && is_callable( array( $wpdb, 'strip_invalid_text_for_column' ) ) ) {
		$fields = array( 'post_title', 'post_content', 'post_excerpt' );

		foreach ( $fields as $field ) {
			if ( isset( $translated[ $field ] ) ) {
				$translated[ $field ] = $wpdb->strip_invalid_text_for_column( $wpdb->posts, $field, $translated[ $field ] );
			}
		}

		wp_update_post( $translated );
	}

	// Now that we have an ID we can fix any attachment anchor hrefs
	_fix_attachment_links( $post_ID );

	wp_set_post_lock( $post_ID );

	if ( current_user_can( $ptype->cap->edit_others_posts ) && current_user_can( $ptype->cap->publish_posts ) ) {
		if ( ! empty( $post_data['sticky'] ) )
			stick_post( $post_ID );
		else
			unstick_post( $post_ID );
	}

	return $post_ID;
}

/**
 * Process the post data for the bulk editing of posts.
 *
 * Updates all bulk edited posts/pages, adding (but not removing) tags and
 * categories. Skips pages when they would be their own parent or child.
 *
 * @since 2.7.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param array $post_data Optional, the array of post data to process if not provided will use $_POST superglobal.
 * @return array
 */
function bulk_edit_posts( $post_data = null ) {
	global $wpdb;

	if ( empty($post_data) )
		$post_data = &$_POST;

	if ( isset($post_data['post_type']) )
		$ptype = get_post_type_object($post_data['post_type']);
	else
		$ptype = get_post_type_object('post');

	if ( !current_user_can( $ptype->cap->edit_posts ) ) {
		if ( 'page' == $ptype->name )
			wp_die( __('Sorry, you are not allowed to edit pages.'));
		else
			wp_die( __('Sorry, you are not allowed to edit posts.'));
	}

	if ( -1 == $post_data['_status'] ) {
		$post_data['post_status'] = null;
		unset($post_data['post_status']);
	} else {
		$post_data['post_status'] = $post_data['_status'];
	}
	unset($post_data['_status']);

	if ( ! empty( $post_data['post_status'] ) ) {
		$post_data['post_status'] = sanitize_key( $post_data['post_status'] );

		if ( 'inherit' == $post_data['post_status'] ) {
			unset( $post_data['post_status'] );
		}
	}

	$post_IDs = array_map( 'intval', (array) $post_data['post'] );

	$reset = array(
		'post_author', 'post_status', 'post_password',
		'post_parent', 'page_template', 'comment_status',
		'ping_status', 'keep_private', 'tax_input',
		'post_category', 'sticky', 'post_format',
	);

	foreach ( $reset as $field ) {
		if ( isset($post_data[$field]) && ( '' == $post_data[$field] || -1 == $post_data[$field] ) )
			unset($post_data[$field]);
	}

	if ( isset($post_data['post_category']) ) {
		if ( is_array($post_data['post_category']) && ! empty($post_data['post_category']) )
			$new_cats = array_map( 'absint', $post_data['post_category'] );
		else
			unset($post_data['post_category']);
	}

	$tax_input = array();
	if ( isset($post_data['tax_input'])) {
		foreach ( $post_data['tax_input'] as $tax_name => $terms ) {
			if ( empty($terms) )
				continue;
			if ( is_taxonomy_hierarchical( $tax_name ) ) {
				$tax_input[ $tax_name ] = array_map( 'absint', $terms );
			} else {
				$comma = _x( ',', 'tag delimiter' );
				if ( ',' !== $comma )
					$terms = str_replace( $comma, ',', $terms );
				$tax_input[ $tax_name ] = explode( ',', trim( $terms, " \n\t\r\0\x0B," ) );
			}
		}
	}

	if ( isset($post_data['post_parent']) && ($parent = (int) $post_data['post_parent']) ) {
		$pages = $wpdb->get_results("SELECT ID, post_parent FROM $wpdb->posts WHERE post_type = 'page'");
		$children = array();

		for ( $i = 0; $i < 50 && $parent > 0; $i++ ) {
			$children[] = $parent;

			foreach ( $pages as $page ) {
				if ( $page->ID == $parent ) {
					$parent = $page->post_parent;
					break;
				}
			}
		}
	}

	$updated = $skipped = $locked = array();
	$shared_post_data = $post_data;

	foreach ( $post_IDs as $post_ID ) {
		// Start with fresh post data with each iteration.
		$post_data = $shared_post_data;

		$post_type_object = get_post_type_object( get_post_type( $post_ID ) );

		if ( !isset( $post_type_object ) || ( isset($children) && in_array($post_ID, $children) ) || !current_user_can( 'edit_post', $post_ID ) ) {
			$skipped[] = $post_ID;
			continue;
		}

		if ( wp_check_post_lock( $post_ID ) ) {
			$locked[] = $post_ID;
			continue;
		}

		$post = get_post( $post_ID );
		$tax_names = get_object_taxonomies( $post );
		foreach ( $tax_names as $tax_name ) {
			$taxonomy_obj = get_taxonomy($tax_name);
			if ( isset( $tax_input[$tax_name]) && current_user_can( $taxonomy_obj->cap->assign_terms ) )
				$new_terms = $tax_input[$tax_name];
			else
				$new_terms = array();

			if ( $taxonomy_obj->hierarchical )
				$current_terms = (array) wp_get_object_terms( $post_ID, $tax_name, array('fields' => 'ids') );
			else
				$current_terms = (array) wp_get_object_terms( $post_ID, $tax_name, array('fields' => 'names') );

			$post_data['tax_input'][$tax_name] = array_merge( $current_terms, $new_terms );
		}

		if ( isset($new_cats) && in_array( 'category', $tax_names ) ) {
			$cats = (array) wp_get_post_categories($post_ID);
			$post_data['post_category'] = array_unique( array_merge($cats, $new_cats) );
			unset( $post_data['tax_input']['category'] );
		}

		$post_data['post_ID']        = $post_ID;
		$post_data['post_type'] = $post->post_type;
		$post_data['post_mime_type'] = $post->post_mime_type;

		foreach ( array( 'comment_status', 'ping_status', 'post_author' ) as $field ) {
			if ( ! isset( $post_data[ $field ] ) ) {
				$post_data[ $field ] = $post->$field;
			}
		}

		$post_data = _wp_translate_postdata( true, $post_data );
		if ( is_wp_error( $post_data ) ) {
			$skipped[] = $post_ID;
			continue;
		}
		$post_data = _wp_get_allowed_postdata( $post_data );

		if ( isset( $shared_post_data['post_format'] ) ) {
			set_post_format( $post_ID, $shared_post_data['post_format'] );
			unset( $post_data['tax_input']['post_format'] );
		}

		$updated[] = wp_update_post( $post_data );

		if ( isset( $post_data['sticky'] ) && current_user_can( $ptype->cap->edit_others_posts ) ) {
			if ( 'sticky' == $post_data['sticky'] )
				stick_post( $post_ID );
			else
				unstick_post( $post_ID );
		}
	}

	return array( 'updated' => $updated, 'skipped' => $skipped, 'locked' => $locked );
}

/**
 * Default post information to use when populating the "Write Post" form.
 *
 * @since 2.0.0
 *
 * @param string $post_type    Optional. A post type string. Default 'post'.
 * @param bool   $create_in_db Optional. Whether to insert the post into database. Default false.
 * @return WP_Post Post object containing all the default post data as attributes
 */
function get_default_post_to_edit( $post_type = 'post', $create_in_db = false ) {
	$post_title = '';
	if ( !empty( $_REQUEST['post_title'] ) )
		$post_title = esc_html( wp_unslash( $_REQUEST['post_title'] ));

	$post_content = '';
	if ( !empty( $_REQUEST['content'] ) )
		$post_content = esc_html( wp_unslash( $_REQUEST['content'] ));

	$post_excerpt = '';
	if ( !empty( $_REQUEST['excerpt'] ) )
		$post_excerpt = esc_html( wp_unslash( $_REQUEST['excerpt'] ));

	if ( $create_in_db ) {
		$post_id = wp_insert_post( array( 'post_title' => __( 'Auto Draft' ), 'post_type' => $post_type, 'post_status' => 'auto-draft' ) );
		$post = get_post( $post_id );
		if ( current_theme_supports( 'post-formats' ) && post_type_supports( $post->post_type, 'post-formats' ) && get_option( 'default_post_format' ) )
			set_post_format( $post, get_option( 'default_post_format' ) );
	} else {
		$post = new stdClass;
		$post->ID = 0;
		$post->post_author = '';
		$post->post_date = '';
		$post->post_date_gmt = '';
		$post->post_password = '';
		$post->post_name = '';
		$post->post_type = $post_type;
		$post->post_status = 'draft';
		$post->to_ping = '';
		$post->pinged = '';
		$post->comment_status = get_default_comment_status( $post_type );
		$post->ping_status = get_default_comment_status( $post_type, 'pingback' );
		$post->post_pingback = get_option( 'default_pingback_flag' );
		$post->post_category = get_option( 'default_category' );
		$post->page_template = 'default';
		$post->post_parent = 0;
		$post->menu_order = 0;
		$post = new WP_Post( $post );
	}

	/**
	 * Filters the default post content initially used in the "Write Post" form.
	 *
	 * @since 1.5.0
	 *
	 * @param string  $post_content Default post content.
	 * @param WP_Post $post         Post object.
	 */
	$post->post_content = (string) apply_filters( 'default_content', $post_content, $post );

	/**
	 * Filters the default post title initially used in the "Write Post" form.
	 *
	 * @since 1.5.0
	 *
	 * @param string  $post_title Default post title.
	 * @param WP_Post $post       Post object.
	 */
	$post->post_title = (string) apply_filters( 'default_title', $post_title, $post );

	/**
	 * Filters the default post excerpt initially used in the "Write Post" form.
	 *
	 * @since 1.5.0
	 *
	 * @param string  $post_excerpt Default post excerpt.
	 * @param WP_Post $post         Post object.
	 */
	$post->post_excerpt = (string) apply_filters( 'default_excerpt', $post_excerpt, $post );

	return $post;
}

/**
 * Determine if a post exists based on title, content, and date
 *
 * @since 2.0.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $title Post title
 * @param string $content Optional post content
 * @param string $date Optional post date
 * @return int Post ID if post exists, 0 otherwise.
 */
function post_exists($title, $content = '', $date = '') {
	global $wpdb;

	$post_title = wp_unslash( sanitize_post_field( 'post_title', $title, 0, 'db' ) );
	$post_content = wp_unslash( sanitize_post_field( 'post_content', $content, 0, 'db' ) );
	$post_date = wp_unslash( sanitize_post_field( 'post_date', $date, 0, 'db' ) );

	$query = "SELECT ID FROM $wpdb->posts WHERE 1=1";
	$args = array();

	if ( !empty ( $date ) ) {
		$query .= ' AND post_date = %s';
		$args[] = $post_date;
	}

	if ( !empty ( $title ) ) {
		$query .= ' AND post_title = %s';
		$args[] = $post_title;
	}

	if ( !empty ( $content ) ) {
		$query .= ' AND post_content = %s';
		$args[] = $post_content;
	}

	if ( !empty ( $args ) )
		return (int) $wpdb->get_var( $wpdb->prepare($query, $args) );

	return 0;
}

/**
 * Creates a new post from the "Write Post" form using $_POST information.
 *
 * @since 2.1.0
 *
 * @global WP_User $current_user
 *
 * @return int|WP_Error
 */
function wp_write_post() {
	if ( isset($_POST['post_type']) )
		$ptype = get_post_type_object($_POST['post_type']);
	else
		$ptype = get_post_type_object('post');

	if ( !current_user_can( $ptype->cap->edit_posts ) ) {
		if ( 'page' == $ptype->name )
			return new WP_Error( 'edit_pages', __( 'Sorry, you are not allowed to create pages on this site.' ) );
		else
			return new WP_Error( 'edit_posts', __( 'Sorry, you are not allowed to create posts or drafts on this site.' ) );
	}

	$_POST['post_mime_type'] = '';

	// Clear out any data in internal vars.
	unset( $_POST['filter'] );

	// Edit don't write if we have a post id.
	if ( isset( $_POST['post_ID'] ) )
		return edit_post();

	if ( isset($_POST['visibility']) ) {
		switch ( $_POST['visibility'] ) {
			case 'public' :
				$_POST['post_password'] = '';
				break;
			case 'password' :
				unset( $_POST['sticky'] );
				break;
			case 'private' :
				$_POST['post_status'] = 'private';
				$_POST['post_password'] = '';
				unset( $_POST['sticky'] );
				break;
		}
	}

	$translated = _wp_translate_postdata( false );
	if ( is_wp_error($translated) )
		return $translated;
	$translated = _wp_get_allowed_postdata( $translated );

	// Create the post.
	$post_ID = wp_insert_post( $translated );
	if ( is_wp_error( $post_ID ) )
		return $post_ID;

	if ( empty($post_ID) )
		return 0;

	add_meta( $post_ID );

	add_post_meta( $post_ID, '_edit_last', $GLOBALS['current_user']->ID );

	// Now that we have an ID we can fix any attachment anchor hrefs
	_fix_attachment_links( $post_ID );

	wp_set_post_lock( $post_ID );

	return $post_ID;
}

/**
 * Calls wp_write_post() and handles the errors.
 *
 * @since 2.0.0
 *
 * @return int|null
 */
function write_post() {
	$result = wp_write_post();
	if ( is_wp_error( $result ) )
		wp_die( $result->get_error_message() );
	else
		return $result;
}

//
// Post Meta
//

/**
 * Add post meta data defined in $_POST superglobal for post with given ID.
 *
 * @since 1.2.0
 *
 * @param int $post_ID
 * @return int|bool
 */
function add_meta( $post_ID ) {
	$post_ID = (int) $post_ID;

	$metakeyselect = isset($_POST['metakeyselect']) ? wp_unslash( trim( $_POST['metakeyselect'] ) ) : '';
	$metakeyinput = isset($_POST['metakeyinput']) ? wp_unslash( trim( $_POST['metakeyinput'] ) ) : '';
	$metavalue = isset($_POST['metavalue']) ? $_POST['metavalue'] : '';
	if ( is_string( $metavalue ) )
		$metavalue = trim( $metavalue );

	if ( ( ( '#NONE#' != $metakeyselect ) && ! empty( $metakeyselect ) ) || ! empty( $metakeyinput ) ) {
		/*
		 * We have a key/value pair. If both the select and the input
		 * for the key have data, the input takes precedence.
		 */
 		if ( '#NONE#' != $metakeyselect )
			$metakey = $metakeyselect;

		if ( $metakeyinput )
			$metakey = $metakeyinput; // default

		if ( is_protected_meta( $metakey, 'post' ) || ! current_user_can( 'add_post_meta', $post_ID, $metakey ) )
			return false;

		$metakey = wp_slash( $metakey );

		return add_post_meta( $post_ID, $metakey, $metavalue );
	}

	return false;
} // add_meta

/**
 * Delete post meta data by meta ID.
 *
 * @since 1.2.0
 *
 * @param int $mid
 * @return bool
 */
function delete_meta( $mid ) {
	return delete_metadata_by_mid( 'post' , $mid );
}

/**
 * Get a list of previously defined keys.
 *
 * @since 1.2.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @return mixed
 */
function get_meta_keys() {
	global $wpdb;

	$keys = $wpdb->get_col( "
			SELECT meta_key
			FROM $wpdb->postmeta
			GROUP BY meta_key
			ORDER BY meta_key" );

	return $keys;
}

/**
 * Get post meta data by meta ID.
 *
 * @since 2.1.0
 *
 * @param int $mid
 * @return object|bool
 */
function get_post_meta_by_id( $mid ) {
	return get_metadata_by_mid( 'post', $mid );
}

/**
 * Get meta data for the given post ID.
 *
 * @since 1.2.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int $postid
 * @return mixed
 */
function has_meta( $postid ) {
	global $wpdb;

	return $wpdb->get_results( $wpdb->prepare("SELECT meta_key, meta_value, meta_id, post_id
			FROM $wpdb->postmeta WHERE post_id = %d
			ORDER BY meta_key,meta_id", $postid), ARRAY_A );
}

/**
 * Update post meta data by meta ID.
 *
 * @since 1.2.0
 *
 * @param int    $meta_id
 * @param string $meta_key Expect Slashed
 * @param string $meta_value Expect Slashed
 * @return bool
 */
function update_meta( $meta_id, $meta_key, $meta_value ) {
	$meta_key = wp_unslash( $meta_key );
	$meta_value = wp_unslash( $meta_value );

	return update_metadata_by_mid( 'post', $meta_id, $meta_value, $meta_key );
}

//
// Private
//

/**
 * Replace hrefs of attachment anchors with up-to-date permalinks.
 *
 * @since 2.3.0
 * @access private
 *
 * @param int|object $post Post ID or post object.
 * @return void|int|WP_Error Void if nothing fixed. 0 or WP_Error on update failure. The post ID on update success.
 */
function _fix_attachment_links( $post ) {
	$post = get_post( $post, ARRAY_A );
	$content = $post['post_content'];

	// Don't run if no pretty permalinks or post is not published, scheduled, or privately published.
	if ( ! get_option( 'permalink_structure' ) || ! in_array( $post['post_status'], array( 'publish', 'future', 'private' ) ) )
		return;

	// Short if there aren't any links or no '?attachment_id=' strings (strpos cannot be zero)
	if ( !strpos($content, '?attachment_id=') || !preg_match_all( '/<a ([^>]+)>[\s\S]+?<\/a>/', $content, $link_matches ) )
		return;

	$site_url = get_bloginfo('url');
	$site_url = substr( $site_url, (int) strpos($site_url, '://') ); // remove the http(s)
	$replace = '';

	foreach ( $link_matches[1] as $key => $value ) {
		if ( !strpos($value, '?attachment_id=') || !strpos($value, 'wp-att-')
			|| !preg_match( '/href=(["\'])[^"\']*\?attachment_id=(\d+)[^"\']*\\1/', $value, $url_match )
			|| !preg_match( '/rel=["\'][^"\']*wp-att-(\d+)/', $value, $rel_match ) )
				continue;

		$quote = $url_match[1]; // the quote (single or double)
		$url_id = (int) $url_match[2];
		$rel_id = (int) $rel_match[1];

		if ( !$url_id || !$rel_id || $url_id != $rel_id || strpos($url_match[0], $site_url) === false )
			continue;

		$link = $link_matches[0][$key];
		$replace = str_replace( $url_match[0], 'href=' . $quote . get_attachment_link( $url_id ) . $quote, $link );

		$content = str_replace( $link, $replace, $content );
	}

	if ( $replace ) {
		$post['post_content'] = $content;
		// Escape data pulled from DB.
		$post = add_magic_quotes($post);

		return wp_update_post($post);
	}
}

/**
 * Get all the possible statuses for a post_type
 *
 * @since 2.5.0
 *
 * @param string $type The post_type you want the statuses for
 * @return array As array of all the statuses for the supplied post type
 */
function get_available_post_statuses($type = 'post') {
	$stati = wp_count_posts($type);

	return array_keys(get_object_vars($stati));
}

/**
 * Run the wp query to fetch the posts for listing on the edit posts page
 *
 * @since 2.5.0
 *
 * @param array|bool $q Array of query variables to use to build the query or false to use $_GET superglobal.
 * @return array
 */
function wp_edit_posts_query( $q = false ) {
	if ( false === $q )
		$q = $_GET;
	$q['m'] = isset($q['m']) ? (int) $q['m'] : 0;
	$q['cat'] = isset($q['cat']) ? (int) $q['cat'] : 0;
	$post_stati  = get_post_stati();

	if ( isset($q['post_type']) && in_array( $q['post_type'], get_post_types() ) )
		$post_type = $q['post_type'];
	else
		$post_type = 'post';

	$avail_post_stati = get_available_post_statuses($post_type);
	$post_status      = '';
	$perm             = '';

	if ( isset($q['post_status']) && in_array( $q['post_status'], $post_stati ) ) {
		$post_status = $q['post_status'];
		$perm = 'readable';
	}

	$orderby = '';

	if ( isset( $q['orderby'] ) ) {
		$orderby = $q['orderby'];
	} elseif ( isset( $q['post_status'] ) && in_array( $q['post_status'], array( 'pending', 'draft' ) ) ) {
		$orderby = 'modified';
	}

	$order = '';

	if ( isset( $q['order'] ) ) {
		$order = $q['order'];
	} elseif ( isset( $q['post_status'] ) && 'pending' == $q['post_status'] ) {
		$order = 'ASC';
	}

	$per_page = "edit_{$post_type}_per_page";
	$posts_per_page = (int) get_user_option( $per_page );
	if ( empty( $posts_per_page ) || $posts_per_page < 1 )
		$posts_per_page = 20;

	/**
	 * Filters the number of items per page to show for a specific 'per_page' type.
	 *
	 * The dynamic portion of the hook name, `$post_type`, refers to the post type.
	 *
	 * Some examples of filter hooks generated here include: 'edit_attachment_per_page',
	 * 'edit_post_per_page', 'edit_page_per_page', etc.
	 *
	 * @since 3.0.0
	 *
	 * @param int $posts_per_page Number of posts to display per page for the given post
	 *                            type. Default 20.
	 */
	$posts_per_page = apply_filters( "edit_{$post_type}_per_page", $posts_per_page );

	/**
	 * Filters the number of posts displayed per page when specifically listing "posts".
	 *
	 * @since 2.8.0
	 *
	 * @param int    $posts_per_page Number of posts to be displayed. Default 20.
	 * @param string $post_type      The post type.
	 */
	$posts_per_page = apply_filters( 'edit_posts_per_page', $posts_per_page, $post_type );

	$query = compact('post_type', 'post_status', 'perm', 'order', 'orderby', 'posts_per_page');

	// Hierarchical types require special args.
	if ( is_post_type_hierarchical( $post_type ) && empty( $orderby ) ) {
		$query['orderby'] = 'menu_order title';
		$query['order'] = 'asc';
		$query['posts_per_page'] = -1;
		$query['posts_per_archive_page'] = -1;
		$query['fields'] = 'id=>parent';
	}

	if ( ! empty( $q['show_sticky'] ) )
		$query['post__in'] = (array) get_option( 'sticky_posts' );

	wp( $query );

	return $avail_post_stati;
}

/**
 * Get all available post MIME types for a given post type.
 *
 * @since 2.5.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $type
 * @return mixed
 */
function get_available_post_mime_types($type = 'attachment') {
	global $wpdb;

	$types = $wpdb->get_col($wpdb->prepare("SELECT DISTINCT post_mime_type FROM $wpdb->posts WHERE post_type = %s", $type));
	return $types;
}

/**
 * Get the query variables for the current attachments request.
 *
 * @since 4.2.0
 *
 * @param array|false $q Optional. Array of query variables to use to build the query or false
 *                       to use $_GET superglobal. Default false.
 * @return array The parsed query vars.
 */
function wp_edit_attachments_query_vars( $q = false ) {
	if ( false === $q ) {
		$q = $_GET;
	}
	$q['m']   = isset( $q['m'] ) ? (int) $q['m'] : 0;
	$q['cat'] = isset( $q['cat'] ) ? (int) $q['cat'] : 0;
	$q['post_type'] = 'attachment';
	$post_type = get_post_type_object( 'attachment' );
	$states = 'inherit';
	if ( current_user_can( $post_type->cap->read_private_posts ) ) {
		$states .= ',private';
	}

	$q['post_status'] = isset( $q['status'] ) && 'trash' == $q['status'] ? 'trash' : $states;
	$q['post_status'] = isset( $q['attachment-filter'] ) && 'trash' == $q['attachment-filter'] ? 'trash' : $states;

	$media_per_page = (int) get_user_option( 'upload_per_page' );
	if ( empty( $media_per_page ) || $media_per_page < 1 ) {
		$media_per_page = 20;
	}

	/**
	 * Filters the number of items to list per page when listing media items.
	 *
	 * @since 2.9.0
	 *
	 * @param int $media_per_page Number of media to list. Default 20.
	 */
	$q['posts_per_page'] = apply_filters( 'upload_per_page', $media_per_page );

	$post_mime_types = get_post_mime_types();
	if ( isset($q['post_mime_type']) && !array_intersect( (array) $q['post_mime_type'], array_keys($post_mime_types) ) ) {
		unset($q['post_mime_type']);
	}

	foreach ( array_keys( $post_mime_types ) as $type ) {
		if ( isset( $q['attachment-filter'] ) && "post_mime_type:$type" == $q['attachment-filter'] ) {
			$q['post_mime_type'] = $type;
			break;
		}
	}

	if ( isset( $q['detached'] ) || ( isset( $q['attachment-filter'] ) && 'detached' == $q['attachment-filter'] ) ) {
		$q['post_parent'] = 0;
	}

	if ( isset( $q['mine'] ) || ( isset( $q['attachment-filter'] ) && 'mine' == $q['attachment-filter'] ) ) {
		$q['author'] = get_current_user_id();
	}

	// Filter query clauses to include filenames.
	if ( isset( $q['s'] ) ) {
		add_filter( 'wp_allow_query_attachment_by_filename', '__return_true' );
	}

	return $q;
}

/**
 * Executes a query for attachments. An array of WP_Query arguments
 * can be passed in, which will override the arguments set by this function.
 *
 * @since 2.5.0
 *
 * @param array|false $q Array of query variables to use to build the query or false to use $_GET superglobal.
 * @return array
 */
function wp_edit_attachments_query( $q = false ) {
	wp( wp_edit_attachments_query_vars( $q ) );

	$post_mime_types = get_post_mime_types();
	$avail_post_mime_types = get_available_post_mime_types( 'attachment' );

	return array( $post_mime_types, $avail_post_mime_types );
}

/**
 * Returns the list of classes to be used by a meta box.
 *
 * @since 2.5.0
 *
 * @param string $id
 * @param string $page
 * @return string
 */
function postbox_classes( $id, $page ) {
	if ( isset( $_GET['edit'] ) && $_GET['edit'] == $id ) {
		$classes = array( '' );
	} elseif ( $closed = get_user_option('closedpostboxes_'.$page ) ) {
		if ( !is_array( $closed ) ) {
			$classes = array( '' );
		} else {
			$classes = in_array( $id, $closed ) ? array( 'closed' ) : array( '' );
		}
	} else {
		$classes = array( '' );
	}

	/**
	 * Filters the postbox classes for a specific screen and screen ID combo.
	 *
	 * The dynamic portions of the hook name, `$page` and `$id`, refer to
	 * the screen and screen ID, respectively.
	 *
	 * @since 3.2.0
	 *
	 * @param array $classes An array of postbox classes.
	 */
	$classes = apply_filters( "postbox_classes_{$page}_{$id}", $classes );
	return implode( ' ', $classes );
}

/**
 * Get a sample permalink based off of the post name.
 *
 * @since 2.5.0
 *
 * @param int    $id    Post ID or post object.
 * @param string $title Optional. Title to override the post's current title when generating the post name. Default null.
 * @param string $name  Optional. Name to override the post name. Default null.
 * @return array Array containing the sample permalink with placeholder for the post name, and the post name.
 */
function get_sample_permalink($id, $title = null, $name = null) {
	$post = get_post( $id );
	if ( ! $post )
		return array( '', '' );

	$ptype = get_post_type_object($post->post_type);

	$original_status = $post->post_status;
	$original_date = $post->post_date;
	$original_name = $post->post_name;

	// Hack: get_permalink() would return ugly permalink for drafts, so we will fake that our post is published.
	if ( in_array( $post->post_status, array( 'draft', 'pending', 'future' ) ) ) {
		$post->post_status = 'publish';
		$post->post_name = sanitize_title($post->post_name ? $post->post_name : $post->post_title, $post->ID);
	}

	// If the user wants to set a new name -- override the current one
	// Note: if empty name is supplied -- use the title instead, see #6072
	if ( !is_null($name) )
		$post->post_name = sanitize_title($name ? $name : $title, $post->ID);

	$post->post_name = wp_unique_post_slug($post->post_name, $post->ID, $post->post_status, $post->post_type, $post->post_parent);

	$post->filter = 'sample';

	$permalink = get_permalink($post, true);

	// Replace custom post_type Token with generic pagename token for ease of use.
	$permalink = str_replace("%$post->post_type%", '%pagename%', $permalink);

	// Handle page hierarchy
	if ( $ptype->hierarchical ) {
		$uri = get_page_uri($post);
		if ( $uri ) {
			$uri = untrailingslashit($uri);
			$uri = strrev( stristr( strrev( $uri ), '/' ) );
			$uri = untrailingslashit($uri);
		}

		/** This filter is documented in wp-admin/edit-tag-form.php */
		$uri = apply_filters( 'editable_slug', $uri, $post );
		if ( !empty($uri) )
			$uri .= '/';
		$permalink = str_replace('%pagename%', "{$uri}%pagename%", $permalink);
	}

	/** This filter is documented in wp-admin/edit-tag-form.php */
	$permalink = array( $permalink, apply_filters( 'editable_slug', $post->post_name, $post ) );
	$post->post_status = $original_status;
	$post->post_date = $original_date;
	$post->post_name = $original_name;
	unset($post->filter);

	/**
	 * Filters the sample permalink.
	 *
	 * @since 4.4.0
	 *
	 * @param array   $permalink Array containing the sample permalink with placeholder for the post name, and the post name.
	 * @param int     $post_id   Post ID.
	 * @param string  $title     Post title.
	 * @param string  $name      Post name (slug).
	 * @param WP_Post $post      Post object.
	 */
	return apply_filters( 'get_sample_permalink', $permalink, $post->ID, $title, $name, $post );
}

/**
 * Returns the HTML of the sample permalink slug editor.
 *
 * @since 2.5.0
 *
 * @param int    $id        Post ID or post object.
 * @param string $new_title Optional. New title. Default null.
 * @param string $new_slug  Optional. New slug. Default null.
 * @return string The HTML of the sample permalink slug editor.
 */
function get_sample_permalink_html( $id, $new_title = null, $new_slug = null ) {
	$post = get_post( $id );
	if ( ! $post )
		return '';

	list($permalink, $post_name) = get_sample_permalink($post->ID, $new_title, $new_slug);

	$view_link = false;
	$preview_target = '';

	if ( current_user_can( 'read_post', $post->ID ) ) {
		if ( 'draft' === $post->post_status || empty( $post->post_name ) ) {
			$view_link = get_preview_post_link( $post );
			$preview_target = " target='wp-preview-{$post->ID}'";
		} else {
			if ( 'publish' === $post->post_status || 'attachment' === $post->post_type ) {
				$view_link = get_permalink( $post );
			} else {
				// Allow non-published (private, future) to be viewed at a pretty permalink, in case $post->post_name is set
				$view_link = str_replace( array( '%pagename%', '%postname%' ), $post->post_name, $permalink );
			}
		}
	}

	// Permalinks without a post/page name placeholder don't have anything to edit
	if ( false === strpos( $permalink, '%postname%' ) && false === strpos( $permalink, '%pagename%' ) ) {
		$return = '<strong>' . __( 'Permalink:' ) . "</strong>\n";

		if ( false !== $view_link ) {
			$display_link = urldecode( $view_link );
			$return .= '<a id="sample-permalink" href="' . esc_url( $view_link ) . '"' . $preview_target . '>' . esc_html( $display_link ) . "</a>\n";
		} else {
			$return .= '<span id="sample-permalink">' . $permalink . "</span>\n";
		}

		// Encourage a pretty permalink setting
		if ( '' == get_option( 'permalink_structure' ) && current_user_can( 'manage_options' ) && !( 'page' == get_option('show_on_front') && $id == get_option('page_on_front') ) ) {
			$return .= '<span id="change-permalinks"><a href="options-permalink.php" class="button button-small" target="_blank">' . __('Change Permalinks') . "</a></span>\n";
		}
	} else {
		if ( mb_strlen( $post_name ) > 34 ) {
			$post_name_abridged = mb_substr( $post_name, 0, 16 ) . '&hellip;' . mb_substr( $post_name, -16 );
		} else {
			$post_name_abridged = $post_name;
		}

		$post_name_html = '<span id="editable-post-name">' . esc_html( $post_name_abridged ) . '</span>';
		$display_link = str_replace( array( '%pagename%', '%postname%' ), $post_name_html, esc_html( urldecode( $permalink ) ) );

		$return = '<strong>' . __( 'Permalink:' ) . "</strong>\n";
		$return .= '<span id="sample-permalink"><a href="' . esc_url( $view_link ) . '"' . $preview_target . '>' . $display_link . "</a></span>\n";
		$return .= '&lrm;'; // Fix bi-directional text display defect in RTL languages.
		$return .= '<span id="edit-slug-buttons"><button type="button" class="edit-slug button button-small hide-if-no-js" aria-label="' . __( 'Edit permalink' ) . '">' . __( 'Edit' ) . "</button></span>\n";
		$return .= '<span id="editable-post-name-full">' . esc_html( $post_name ) . "</span>\n";
	}

	/**
	 * Filters the sample permalink HTML markup.
	 *
	 * @since 2.9.0
	 * @since 4.4.0 Added `$post` parameter.
	 *
	 * @param string  $return    Sample permalink HTML markup.
	 * @param int     $post_id   Post ID.
	 * @param string  $new_title New sample permalink title.
	 * @param string  $new_slug  New sample permalink slug.
	 * @param WP_Post $post      Post object.
	 */
	$return = apply_filters( 'get_sample_permalink_html', $return, $post->ID, $new_title, $new_slug, $post );

	return $return;
}

/**
 * Output HTML for the post thumbnail meta-box.
 *
 * @since 2.9.0
 *
 * @param int $thumbnail_id ID of the attachment used for thumbnail
 * @param mixed $post The post ID or object associated with the thumbnail, defaults to global $post.
 * @return string html
 */
function _wp_post_thumbnail_html( $thumbnail_id = null, $post = null ) {
	$_wp_additional_image_sizes = wp_get_additional_image_sizes();

	$post               = get_post( $post );
	$post_type_object   = get_post_type_object( $post->post_type );
	$set_thumbnail_link = '<p class="hide-if-no-js"><a href="%s" id="set-post-thumbnail"%s class="thickbox">%s</a></p>';
	$upload_iframe_src  = get_upload_iframe_src( 'image', $post->ID );

	$content = sprintf( $set_thumbnail_link,
		esc_url( $upload_iframe_src ),
		'', // Empty when there's no featured image set, `aria-describedby` attribute otherwise.
		esc_html( $post_type_object->labels->set_featured_image )
	);

	if ( $thumbnail_id && get_post( $thumbnail_id ) ) {
		$size = isset( $_wp_additional_image_sizes['post-thumbnail'] ) ? 'post-thumbnail' : array( 266, 266 );

		/**
		 * Filters the size used to display the post thumbnail image in the 'Featured Image' meta box.
		 *
		 * Note: When a theme adds 'post-thumbnail' support, a special 'post-thumbnail'
		 * image size is registered, which differs from the 'thumbnail' image size
		 * managed via the Settings > Media screen. See the `$size` parameter description
		 * for more information on default values.
		 *
		 * @since 4.4.0
		 *
		 * @param string|array $size         Post thumbnail image size to display in the meta box. Accepts any valid
		 *                                   image size, or an array of width and height values in pixels (in that order).
		 *                                   If the 'post-thumbnail' size is set, default is 'post-thumbnail'. Otherwise,
		 *                                   default is an array with 266 as both the height and width values.
		 * @param int          $thumbnail_id Post thumbnail attachment ID.
		 * @param WP_Post      $post         The post object associated with the thumbnail.
		 */
		$size = apply_filters( 'admin_post_thumbnail_size', $size, $thumbnail_id, $post );

		$thumbnail_html = wp_get_attachment_image( $thumbnail_id, $size );

		if ( ! empty( $thumbnail_html ) ) {
			$content = sprintf( $set_thumbnail_link,
				esc_url( $upload_iframe_src ),
				' aria-describedby="set-post-thumbnail-desc"',
				$thumbnail_html
			);
			$content .= '<p class="hide-if-no-js howto" id="set-post-thumbnail-desc">' . __( 'Click the image to edit or update' ) . '</p>';
			$content .= '<p class="hide-if-no-js"><a href="#" id="remove-post-thumbnail">' . esc_html( $post_type_object->labels->remove_featured_image ) . '</a></p>';
		}
	}

	$content .= '<input type="hidden" id="_thumbnail_id" name="_thumbnail_id" value="' . esc_attr( $thumbnail_id ? $thumbnail_id : '-1' ) . '" />';

	/**
	 * Filters the admin post thumbnail HTML markup to return.
	 *
	 * @since 2.9.0
	 * @since 3.5.0 Added the `$post_id` parameter.
	 * @since 4.6.0 Added the `$thumbnail_id` parameter.
	 *
	 * @param string $content      Admin post thumbnail HTML markup.
	 * @param int    $post_id      Post ID.
	 * @param int    $thumbnail_id Thumbnail ID.
	 */
	return apply_filters( 'admin_post_thumbnail_html', $content, $post->ID, $thumbnail_id );
}

/**
 * Check to see if the post is currently being edited by another user.
 *
 * @since 2.5.0
 *
 * @param int $post_id ID of the post to check for editing.
 * @return int|false ID of the user with lock. False if the post does not exist, post is not locked,
 *                   the user with lock does not exist, or the post is locked by current user.
 */
function wp_check_post_lock( $post_id ) {
	if ( ! $post = get_post( $post_id ) ) {
		return false;
	}

	if ( ! $lock = get_post_meta( $post->ID, '_edit_lock', true ) ) {
		return false;
	}

	$lock = explode( ':', $lock );
	$time = $lock[0];
	$user = isset( $lock[1] ) ? $lock[1] : get_post_meta( $post->ID, '_edit_last', true );

	if ( ! get_userdata( $user ) ) {
		return false;
	}

	/** This filter is documented in wp-admin/includes/ajax-actions.php */
	$time_window = apply_filters( 'wp_check_post_lock_window', 150 );

	if ( $time && $time > time() - $time_window && $user != get_current_user_id() ) {
		return $user;
	}

	return false;
}

/**
 * Mark the post as currently being edited by the current user
 *
 * @since 2.5.0
 *
 * @param int $post_id ID of the post being edited.
 * @return array|false Array of the lock time and user ID. False if the post does not exist, or
 *                     there is no current user.
 */
function wp_set_post_lock( $post_id ) {
	if ( ! $post = get_post( $post_id ) ) {
		return false;
	}

	if ( 0 == ( $user_id = get_current_user_id() ) ) {
		return false;
	}

	$now = time();
	$lock = "$now:$user_id";

	update_post_meta( $post->ID, '_edit_lock', $lock );

	return array( $now, $user_id );
}

/**
 * Outputs the HTML for the notice to say that someone else is editing or has taken over editing of this post.
 *
 * @since 2.8.5
 * @return none
 */
function _admin_notice_post_locked() {
	if ( ! $post = get_post() )
		return;

	$user = null;
	if (  $user_id = wp_check_post_lock( $post->ID ) )
		$user = get_userdata( $user_id );

	if ( $user ) {

		/**
		 * Filters whether to show the post locked dialog.
		 *
		 * Returning a falsey value to the filter will short-circuit displaying the dialog.
		 *
		 * @since 3.6.0
		 *
		 * @param bool         $display Whether to display the dialog. Default true.
		 * @param WP_Post      $post    Post object.
		 * @param WP_User|bool $user    WP_User object on success, false otherwise.
		 */
		if ( ! apply_filters( 'show_post_locked_dialog', true, $post, $user ) )
			return;

		$locked = true;
	} else {
		$locked = false;
	}

	if ( $locked && ( $sendback = wp_get_referer() ) &&
		false === strpos( $sendback, 'post.php' ) && false === strpos( $sendback, 'post-new.php' ) ) {

		$sendback_text = __('Go back');
	} else {
		$sendback = admin_url( 'edit.php' );

		if ( 'post' != $post->post_type )
			$sendback = add_query_arg( 'post_type', $post->post_type, $sendback );

		$sendback_text = get_post_type_object( $post->post_type )->labels->all_items;
	}

	$hidden = $locked ? '' : ' hidden';

	?>
	<div id="post-lock-dialog" class="notification-dialog-wrap<?php echo $hidden; ?>">
	<div class="notification-dialog-background"></div>
	<div class="notification-dialog">
	<?php

	if ( $locked ) {
		$query_args = array();
		if ( get_post_type_object( $post->post_type )->public ) {
			if ( 'publish' == $post->post_status || $user->ID != $post->post_author ) {
				// Latest content is in autosave
				$nonce = wp_create_nonce( 'post_preview_' . $post->ID );
				$query_args['preview_id'] = $post->ID;
				$query_args['preview_nonce'] = $nonce;
			}
		}

		$preview_link = get_preview_post_link( $post->ID, $query_args );

		/**
		 * Filters whether to allow the post lock to be overridden.
		 *
		 * Returning a falsey value to the filter will disable the ability
		 * to override the post lock.
		 *
		 * @since 3.6.0
		 *
		 * @param bool    $override Whether to allow overriding post locks. Default true.
		 * @param WP_Post $post     Post object.
		 * @param WP_User $user     User object.
		 */
		$override = apply_filters( 'override_post_lock', true, $post, $user );
		$tab_last = $override ? '' : ' wp-tab-last';

		?>
		<div class="post-locked-message">
		<div class="post-locked-avatar"><?php echo get_avatar( $user->ID, 64 ); ?></div>
		<p class="currently-editing wp-tab-first" tabindex="0">
		<?php
			if ( $override ) {
				/* translators: %s: user's display name */
				printf( __( '%s is already editing this post. Do you want to take over?' ), esc_html( $user->display_name ) );
			} else {
				/* translators: %s: user's display name */
				printf( __( '%s is already editing this post.' ), esc_html( $user->display_name ) );
			}
		?>
		</p>
		<?php
		/**
		 * Fires inside the post locked dialog before the buttons are displayed.
		 *
		 * @since 3.6.0
		 *
		 * @param WP_Post $post Post object.
		 */
		do_action( 'post_locked_dialog', $post );
		?>
		<p>
		<a class="button" href="<?php echo esc_url( $sendback ); ?>"><?php echo $sendback_text; ?></a>
		<?php if ( $preview_link ) { ?>
		<a class="button<?php echo $tab_last; ?>" href="<?php echo esc_url( $preview_link ); ?>"><?php _e('Preview'); ?></a>
		<?php
		}

		// Allow plugins to prevent some users overriding the post lock
		if ( $override ) {
			?>
			<a class="button button-primary wp-tab-last" href="<?php echo esc_url( add_query_arg( 'get-post-lock', '1', wp_nonce_url( get_edit_post_link( $post->ID, 'url' ), 'lock-post_' . $post->ID ) ) ); ?>"><?php _e('Take over'); ?></a>
			<?php
		}

		?>
		</p>
		</div>
		<?php
	} else {
		?>
		<div class="post-taken-over">
			<div class="post-locked-avatar"></div>
			<p class="wp-tab-first" tabindex="0">
			<span class="currently-editing"></span><br />
			<span class="locked-saving hidden"><img src="<?php echo esc_url( admin_url( 'images/spinner-2x.gif' ) ); ?>" width="16" height="16" alt="" /> <?php _e( 'Saving revision&hellip;' ); ?></span>
			<span class="locked-saved hidden"><?php _e('Your latest changes were saved as a revision.'); ?></span>
			</p>
			<?php
			/**
			 * Fires inside the dialog displayed when a user has lost the post lock.
			 *
			 * @since 3.6.0
			 *
			 * @param WP_Post $post Post object.
			 */
			do_action( 'post_lock_lost_dialog', $post );
			?>
			<p><a class="button button-primary wp-tab-last" href="<?php echo esc_url( $sendback ); ?>"><?php echo $sendback_text; ?></a></p>
		</div>
		<?php
	}

	?>
	</div>
	</div>
	<?php
}

/**
 * Creates autosave data for the specified post from $_POST data.
 *
 * @since 2.6.0
 *
 * @param mixed $post_data Associative array containing the post data or int post ID.
 * @return mixed The autosave revision ID. WP_Error or 0 on error.
 */
function wp_create_post_autosave( $post_data ) {
	if ( is_numeric( $post_data ) ) {
		$post_id = $post_data;
		$post_data = $_POST;
	} else {
		$post_id = (int) $post_data['post_ID'];
	}

	$post_data = _wp_translate_postdata( true, $post_data );
	if ( is_wp_error( $post_data ) )
		return $post_data;
	$post_data = _wp_get_allowed_postdata( $post_data );

	$post_author = get_current_user_id();

	// Store one autosave per author. If there is already an autosave, overwrite it.
	if ( $old_autosave = wp_get_post_autosave( $post_id, $post_author ) ) {
		$new_autosave = _wp_post_revision_data( $post_data, true );
		$new_autosave['ID'] = $old_autosave->ID;
		$new_autosave['post_author'] = $post_author;

		// If the new autosave has the same content as the post, delete the autosave.
		$post = get_post( $post_id );
		$autosave_is_different = false;
		foreach ( array_intersect( array_keys( $new_autosave ), array_keys( _wp_post_revision_fields( $post ) ) ) as $field ) {
			if ( normalize_whitespace( $new_autosave[ $field ] ) != normalize_whitespace( $post->$field ) ) {
				$autosave_is_different = true;
				break;
			}
		}

		if ( ! $autosave_is_different ) {
			wp_delete_post_revision( $old_autosave->ID );
			return 0;
		}

		/**
		 * Fires before an autosave is stored.
		 *
		 * @since 4.1.0
		 *
		 * @param array $new_autosave Post array - the autosave that is about to be saved.
		 */
		do_action( 'wp_creating_autosave', $new_autosave );

		return wp_update_post( $new_autosave );
	}

	// _wp_put_post_revision() expects unescaped.
	$post_data = wp_unslash( $post_data );

	// Otherwise create the new autosave as a special post revision
	return _wp_put_post_revision( $post_data, true );
}

/**
 * Saves a draft or manually autosaves for the purpose of showing a post preview.
 *
 * @since 2.7.0
 *
 * @return string URL to redirect to show the preview.
 */
function post_preview() {

	$post_ID = (int) $_POST['post_ID'];
	$_POST['ID'] = $post_ID;

	if ( ! $post = get_post( $post_ID ) ) {
		wp_die( __( 'Sorry, you are not allowed to edit this post.' ) );
	}

	if ( ! current_user_can( 'edit_post', $post->ID ) ) {
		wp_die( __( 'Sorry, you are not allowed to edit this post.' ) );
	}

	$is_autosave = false;

	if ( ! wp_check_post_lock( $post->ID ) && get_current_user_id() == $post->post_author && ( 'draft' == $post->post_status || 'auto-draft' == $post->post_status ) ) {
		$saved_post_id = edit_post();
	} else {
		$is_autosave = true;

		if ( isset( $_POST['post_status'] ) && 'auto-draft' == $_POST['post_status'] )
			$_POST['post_status'] = 'draft';

		$saved_post_id = wp_create_post_autosave( $post->ID );
	}

	if ( is_wp_error( $saved_post_id ) )
		wp_die( $saved_post_id->get_error_message() );

	$query_args = array();

	if ( $is_autosave && $saved_post_id ) {
		$query_args['preview_id'] = $post->ID;
		$query_args['preview_nonce'] = wp_create_nonce( 'post_preview_' . $post->ID );

		if ( isset( $_POST['post_format'] ) ) {
			$query_args['post_format'] = empty( $_POST['post_format'] ) ? 'standard' : sanitize_key( $_POST['post_format'] );
		}

		if ( isset( $_POST['_thumbnail_id'] ) ) {
			$query_args['_thumbnail_id'] = ( intval( $_POST['_thumbnail_id'] ) <= 0 ) ? '-1' : intval( $_POST['_thumbnail_id'] );
		}
	}

	return get_preview_post_link( $post, $query_args );
}

/**
 * Save a post submitted with XHR
 *
 * Intended for use with heartbeat and autosave.js
 *
 * @since 3.9.0
 *
 * @param array $post_data Associative array of the submitted post data.
 * @return mixed The value 0 or WP_Error on failure. The saved post ID on success.
 *               The ID can be the draft post_id or the autosave revision post_id.
 */
function wp_autosave( $post_data ) {
	// Back-compat
	if ( ! defined( 'DOING_AUTOSAVE' ) )
		define( 'DOING_AUTOSAVE', true );

	$post_id = (int) $post_data['post_id'];
	$post_data['ID'] = $post_data['post_ID'] = $post_id;

	if ( false === wp_verify_nonce( $post_data['_wpnonce'], 'update-post_' . $post_id ) ) {
		return new WP_Error( 'invalid_nonce', __( 'Error while saving.' ) );
	}

	$post = get_post( $post_id );

	if ( ! current_user_can( 'edit_post', $post->ID ) ) {
		return new WP_Error( 'edit_posts', __( 'Sorry, you are not allowed to edit this item.' ) );
	}

	if ( 'auto-draft' == $post->post_status )
		$post_data['post_status'] = 'draft';

	if ( $post_data['post_type'] != 'page' && ! empty( $post_data['catslist'] ) )
		$post_data['post_category'] = explode( ',', $post_data['catslist'] );

	if ( ! wp_check_post_lock( $post->ID ) && get_current_user_id() == $post->post_author && ( 'auto-draft' == $post->post_status || 'draft' == $post->post_status ) ) {
		// Drafts and auto-drafts are just overwritten by autosave for the same user if the post is not locked
		return edit_post( wp_slash( $post_data ) );
	} else {
		// Non drafts or other users drafts are not overwritten. The autosave is stored in a special post revision for each user.
		return wp_create_post_autosave( wp_slash( $post_data ) );
	}
}

/**
 * Redirect to previous page.
 *
 * @param int $post_id Optional. Post ID.
 */
function redirect_post($post_id = '') {
	if ( isset($_POST['save']) || isset($_POST['publish']) ) {
		$status = get_post_status( $post_id );

		if ( isset( $_POST['publish'] ) ) {
			switch ( $status ) {
				case 'pending':
					$message = 8;
					break;
				case 'future':
					$message = 9;
					break;
				default:
					$message = 6;
			}
		} else {
			$message = 'draft' == $status ? 10 : 1;
		}

		$location = add_query_arg( 'message', $message, get_edit_post_link( $post_id, 'url' ) );
	} elseif ( isset($_POST['addmeta']) && $_POST['addmeta'] ) {
		$location = add_query_arg( 'message', 2, wp_get_referer() );
		$location = explode('#', $location);
		$location = $location[0] . '#postcustom';
	} elseif ( isset($_POST['deletemeta']) && $_POST['deletemeta'] ) {
		$location = add_query_arg( 'message', 3, wp_get_referer() );
		$location = explode('#', $location);
		$location = $location[0] . '#postcustom';
	} else {
		$location = add_query_arg( 'message', 4, get_edit_post_link( $post_id, 'url' ) );
	}

	/**
	 * Filters the post redirect destination URL.
	 *
	 * @since 2.9.0
	 *
	 * @param string $location The destination URL.
	 * @param int    $post_id  The post ID.
	 */
	wp_redirect( apply_filters( 'redirect_post_location', $location, $post_id ) );
	exit;
}

/**
 * Return whether the post can be edited in the block editor.
 *
 * @since 5.0.0
 *
 * @param int|WP_Post $post Post ID or WP_Post object.
 * @return bool Whether the post can be edited in the block editor.
 */
function use_block_editor_for_post( $post ) {
	$post = get_post( $post );

	if ( ! $post ) {
		return false;
	}

	// We're in the meta box loader, so don't use the block editor.
	if ( isset( $_GET['meta-box-loader'] ) ) {
		check_admin_referer( 'meta-box-loader' );
		return false;
	}

	// The posts page can't be edited in the block editor.
	if ( absint( get_option( 'page_for_posts' ) ) === $post->ID && empty( $post->post_content ) ) {
		return false;
	}

	$use_block_editor = use_block_editor_for_post_type( $post->post_type );

	/**
	 * Filter whether a post is able to be edited in the block editor.
	 *
	 * @since 5.0.0
	 *
	 * @param bool    $use_block_editor Whether the post can be edited or not.
	 * @param WP_Post $post             The post being checked.
	 */
	return apply_filters( 'use_block_editor_for_post', $use_block_editor, $post );
}

/**
 * Return whether a post type is compatible with the block editor.
 *
 * The block editor depends on the REST API, and if the post type is not shown in the
 * REST API, then it won't work with the block editor.
 *
 * @since 5.0.0
 *
 * @param string $post_type The post type.
 * @return bool Whether the post type can be edited with the block editor.
 */
function use_block_editor_for_post_type( $post_type ) {
	if ( ! post_type_exists( $post_type ) ) {
		return false;
	}

	if ( ! post_type_supports( $post_type, 'editor' ) ) {
		return false;
	}

	$post_type_object = get_post_type_object( $post_type );
	if ( $post_type_object && ! $post_type_object->show_in_rest ) {
		return false;
	}

	/**
	 * Filter whether a post is able to be edited in the block editor.
	 *
	 * @since 5.0.0
	 *
	 * @param bool   $use_block_editor  Whether the post type can be edited or not. Default true.
	 * @param string $post_type         The post type being checked.
	 */
	return apply_filters( 'use_block_editor_for_post_type', true, $post_type );
}

/**
 * Returns all the block categories that will be shown in the block editor.
 *
 * @since 5.0.0
 *
 * @param WP_Post $post Post object.
 * @return array Array of block categories.
 */
function get_block_categories( $post ) {
	$default_categories = array(
		array(
			'slug'  => 'common',
			'title' => __( 'Common Blocks' ),
			'icon'  => null,
		),
		array(
			'slug'  => 'formatting',
			'title' => __( 'Formatting' ),
			'icon'  => null,
		),
		array(
			'slug'  => 'layout',
			'title' => __( 'Layout Elements' ),
			'icon'  => null,
		),
		array(
			'slug'  => 'widgets',
			'title' => __( 'Widgets' ),
			'icon'  => null,
		),
		array(
			'slug'  => 'embed',
			'title' => __( 'Embeds' ),
			'icon'  => null,
		),
		array(
			'slug'  => 'reusable',
			'title' => __( 'Reusable Blocks' ),
			'icon'  => null,
		),
	);

	/**
	 * Filter the default array of block categories.
	 *
	 * @since 5.0.0
	 *
	 * @param array   $default_categories Array of block categories.
	 * @param WP_Post $post               Post being loaded.
	 */
	return apply_filters( 'block_categories', $default_categories, $post );
}

/**
 * Prepares server-registered blocks for the block editor.
 *
 * Returns an associative array of registered block data keyed by block name. Data includes properties
 * of a block relevant for client registration.
 *
 * @since 5.0.0
 *
 * @return array An associative array of registered block data.
 */
function get_block_editor_server_block_settings() {
	$block_registry = WP_Block_Type_Registry::get_instance();
	$blocks         = array();
	$keys_to_pick   = array( 'title', 'description', 'icon', 'category', 'keywords', 'supports', 'attributes' );

	foreach ( $block_registry->get_all_registered() as $block_name => $block_type ) {
		foreach ( $keys_to_pick as $key ) {
			if ( ! isset( $block_type->{ $key } ) ) {
				continue;
			}

			if ( ! isset( $blocks[ $block_name ] ) ) {
				$blocks[ $block_name ] = array();
			}

			$blocks[ $block_name ][ $key ] = $block_type->{ $key };
		}
	}

	return $blocks;
}

/**
 * Renders the meta boxes forms.
 *
 * @since 5.0.0
 */
function the_block_editor_meta_boxes() {
	global $post, $current_screen, $wp_meta_boxes;

	// Handle meta box state.
	$_original_meta_boxes = $wp_meta_boxes;

	/**
	 * Fires right before the meta boxes are rendered.
	 *
	 * This allows for the filtering of meta box data, that should already be
	 * present by this point. Do not use as a means of adding meta box data.
	 *
	 * @since 5.0.0
	 *
	 * @param array $wp_meta_boxes Global meta box state.
	 */
	$wp_meta_boxes = apply_filters( 'filter_block_editor_meta_boxes', $wp_meta_boxes );
	$locations     = array( 'side', 'normal', 'advanced' );
	$priorities    = array( 'high', 'sorted', 'core', 'default', 'low' );

	// Render meta boxes.
	?>
	<form class="metabox-base-form">
	<?php the_block_editor_meta_box_post_form_hidden_fields( $post ); ?>
	</form>
	<form id="toggle-custom-fields-form" method="post" action="<?php echo esc_attr( admin_url( 'post.php' ) ); ?>">
		<?php wp_nonce_field( 'toggle-custom-fields' ); ?>
		<input type="hidden" name="action" value="toggle-custom-fields" />
	</form>
	<?php foreach ( $locations as $location ) : ?>
		<form class="metabox-location-<?php echo esc_attr( $location ); ?>" onsubmit="return false;">
			<div id="poststuff" class="sidebar-open">
				<div id="postbox-container-2" class="postbox-container">
					<?php
					do_meta_boxes(
						$current_screen,
						$location,
						$post
					);
					?>
				</div>
			</div>
		</form>
	<?php endforeach; ?>
	<?php

	$meta_boxes_per_location = array();
	foreach ( $locations as $location ) {
		$meta_boxes_per_location[ $location ] = array();

		if ( ! isset( $wp_meta_boxes[ $current_screen->id ][ $location ] ) ) {
			continue;
		}

		foreach ( $priorities as $priority ) {
			if ( ! isset( $wp_meta_boxes[ $current_screen->id ][ $location ][ $priority ] ) ) {
				continue;
			}

			$meta_boxes = (array) $wp_meta_boxes[ $current_screen->id ][ $location ][ $priority ];
			foreach ( $meta_boxes as $meta_box ) {
				if ( false == $meta_box || ! $meta_box['title'] ) {
					continue;
				}

				// If a meta box is just here for back compat, don't show it in the block editor.
				if ( isset( $meta_box['args']['__back_compat_meta_box'] ) && $meta_box['args']['__back_compat_meta_box'] ) {
					continue;
				}

				$meta_boxes_per_location[ $location ][] = array(
					'id'    => $meta_box['id'],
					'title' => $meta_box['title'],
				);
			}
		}
	}

	/**
	 * Sadly we probably can not add this data directly into editor settings.
	 *
	 * Some meta boxes need admin_head to fire for meta box registry.
	 * admin_head fires after admin_enqueue_scripts, which is where we create our
	 * editor instance.
	 */
	$script = 'window._wpLoadBlockEditor.then( function() {
		wp.data.dispatch( \'core/edit-post\' ).setAvailableMetaBoxesPerLocation( ' . wp_json_encode( $meta_boxes_per_location ) . ' );
	} );';

	wp_add_inline_script( 'wp-edit-post', $script );

	/**
	 * When `wp-edit-post` is output in the `<head>`, the inline script needs to be manually printed. Otherwise,
	 * meta boxes will not display because inline scripts for `wp-edit-post` will not be printed again after this point.
	 */
	if ( wp_script_is( 'wp-edit-post', 'done' ) ) {
		printf( "<script type='text/javascript'>\n%s\n</script>\n", trim( $script ) );
	}

	/**
	 * If the 'postcustom' meta box is enabled, then we need to perform some
	 * extra initialization on it.
	 */
	$enable_custom_fields = (bool) get_user_meta( get_current_user_id(), 'enable_custom_fields', true );
	if ( $enable_custom_fields ) {
		$script = "( function( $ ) {
			if ( $('#postcustom').length ) {
				$( '#the-list' ).wpList( {
					addBefore: function( s ) {
						s.data += '&post_id=$post->ID';
						return s;
					},
					addAfter: function() {
						$('table#list-table').show();
					}
				});
			}
		} )( jQuery );";
 		wp_enqueue_script( 'wp-lists' );
		wp_add_inline_script( 'wp-lists', $script );
	}

	// Reset meta box data.
	$wp_meta_boxes = $_original_meta_boxes;
}

/**
 * Renders the hidden form required for the meta boxes form.
 *
 * @since 5.0.0
 *
 * @param WP_Post $post Current post object.
 */
function the_block_editor_meta_box_post_form_hidden_fields( $post ) {
	$form_extra = '';
	if ( 'auto-draft' === $post->post_status ) {
		$form_extra .= "<input type='hidden' id='auto_draft' name='auto_draft' value='1' />";
	}
	$form_action  = 'editpost';
	$nonce_action = 'update-post_' . $post->ID;
	$form_extra  .= "<input type='hidden' id='post_ID' name='post_ID' value='" . esc_attr( $post->ID ) . "' />";
	$referer      = wp_get_referer();
	$current_user = wp_get_current_user();
	$user_id      = $current_user->ID;
	wp_nonce_field( $nonce_action );

	/*
	 * Some meta boxes hook into these actions to add hidden input fields in the classic post form. For backwards
	 * compatibility, we can capture the output from these actions, and extract the hidden input fields.
	 */
	ob_start();
	/** This filter is documented in wp-admin/edit-form-advanced.php */
	do_action( 'edit_form_after_title', $post );
	/** This filter is documented in wp-admin/edit-form-advanced.php */
	do_action( 'edit_form_advanced', $post );
	$classic_output = ob_get_clean();

	$classic_elements = wp_html_split( $classic_output );
	$hidden_inputs    = '';
	foreach( $classic_elements as $element ) {
		if ( 0 !== strpos( $element, '<input ') ) {
			continue;
		}

		if ( preg_match( '/\stype=[\'"]hidden[\'"]\s/', $element ) ) {
			echo $element;
		}
	}
	?>
	<input type="hidden" id="user-id" name="user_ID" value="<?php echo (int) $user_id; ?>" />
	<input type="hidden" id="hiddenaction" name="action" value="<?php echo esc_attr( $form_action ); ?>" />
	<input type="hidden" id="originalaction" name="originalaction" value="<?php echo esc_attr( $form_action ); ?>" />
	<input type="hidden" id="post_type" name="post_type" value="<?php echo esc_attr( $post->post_type ); ?>" />
	<input type="hidden" id="original_post_status" name="original_post_status" value="<?php echo esc_attr( $post->post_status ); ?>" />
	<input type="hidden" id="referredby" name="referredby" value="<?php echo $referer ? esc_url( $referer ) : ''; ?>" />

	<?php
	if ( 'draft' !== get_post_status( $post ) ) {
		wp_original_referer_field( true, 'previous' );
	}
	echo $form_extra;
	wp_nonce_field( 'meta-box-order', 'meta-box-order-nonce', false );
	wp_nonce_field( 'closedpostboxes', 'closedpostboxesnonce', false );
	// Permalink title nonce.
	wp_nonce_field( 'samplepermalink', 'samplepermalinknonce', false );

	/**
	 * Add hidden input fields to the meta box save form.
	 *
	 * Hook into this action to print `<input type="hidden" ... />` fields, which will be POSTed back to
	 * the server when meta boxes are saved.
	 *
	 * @since 5.0.0
	 *
	 * @params WP_Post $post The post that is being edited.
	 */
	do_action( 'block_editor_meta_box_hidden_fields', $post );
}
home/xbodynamge/lebauwcentre/wp-admin/includes/post.php000064400000221420151125225710017333 0ustar00<?php
/**
 * WordPress Post Administration API.
 *
 * @package WordPress
 * @subpackage Administration
 */

/**
 * Rename $_POST data from form names to DB post columns.
 *
 * Manipulates $_POST directly.
 *
 * @since 2.6.0
 *
 * @param bool $update Are we updating a pre-existing post?
 * @param array $post_data Array of post data. Defaults to the contents of $_POST.
 * @return object|bool WP_Error on failure, true on success.
 */
function _wp_translate_postdata( $update = false, $post_data = null ) {

	if ( empty( $post_data ) ) {
		$post_data = &$_POST;
	}

	if ( $update ) {
		$post_data['ID'] = (int) $post_data['post_ID'];
	}

	$ptype = get_post_type_object( $post_data['post_type'] );

	if ( $update && ! current_user_can( 'edit_post', $post_data['ID'] ) ) {
		if ( 'page' == $post_data['post_type'] ) {
			return new WP_Error( 'edit_others_pages', __( 'Sorry, you are not allowed to edit pages as this user.' ) );
		} else {
			return new WP_Error( 'edit_others_posts', __( 'Sorry, you are not allowed to edit posts as this user.' ) );
		}
	} elseif ( ! $update && ! current_user_can( $ptype->cap->create_posts ) ) {
		if ( 'page' == $post_data['post_type'] ) {
			return new WP_Error( 'edit_others_pages', __( 'Sorry, you are not allowed to create pages as this user.' ) );
		} else {
			return new WP_Error( 'edit_others_posts', __( 'Sorry, you are not allowed to create posts as this user.' ) );
		}
	}

	if ( isset( $post_data['content'] ) ) {
		$post_data['post_content'] = $post_data['content'];
	}

	if ( isset( $post_data['excerpt'] ) ) {
		$post_data['post_excerpt'] = $post_data['excerpt'];
	}

	if ( isset( $post_data['parent_id'] ) ) {
		$post_data['post_parent'] = (int) $post_data['parent_id'];
	}

	if ( isset( $post_data['trackback_url'] ) ) {
		$post_data['to_ping'] = $post_data['trackback_url'];
	}

	$post_data['user_ID'] = get_current_user_id();

	if ( ! empty( $post_data['post_author_override'] ) ) {
		$post_data['post_author'] = (int) $post_data['post_author_override'];
	} else {
		if ( ! empty( $post_data['post_author'] ) ) {
			$post_data['post_author'] = (int) $post_data['post_author'];
		} else {
			$post_data['post_author'] = (int) $post_data['user_ID'];
		}
	}

	if ( isset( $post_data['user_ID'] ) && ( $post_data['post_author'] != $post_data['user_ID'] )
		&& ! current_user_can( $ptype->cap->edit_others_posts ) ) {

		if ( $update ) {
			if ( 'page' == $post_data['post_type'] ) {
				return new WP_Error( 'edit_others_pages', __( 'Sorry, you are not allowed to edit pages as this user.' ) );
			} else {
				return new WP_Error( 'edit_others_posts', __( 'Sorry, you are not allowed to edit posts as this user.' ) );
			}
		} else {
			if ( 'page' == $post_data['post_type'] ) {
				return new WP_Error( 'edit_others_pages', __( 'Sorry, you are not allowed to create pages as this user.' ) );
			} else {
				return new WP_Error( 'edit_others_posts', __( 'Sorry, you are not allowed to create posts as this user.' ) );
			}
		}
	}

	if ( ! empty( $post_data['post_status'] ) ) {
		$post_data['post_status'] = sanitize_key( $post_data['post_status'] );

		// No longer an auto-draft
		if ( 'auto-draft' === $post_data['post_status'] ) {
			$post_data['post_status'] = 'draft';
		}

		if ( ! get_post_status_object( $post_data['post_status'] ) ) {
			unset( $post_data['post_status'] );
		}
	}

	// What to do based on which button they pressed
	if ( isset( $post_data['saveasdraft'] ) && '' != $post_data['saveasdraft'] ) {
		$post_data['post_status'] = 'draft';
	}
	if ( isset( $post_data['saveasprivate'] ) && '' != $post_data['saveasprivate'] ) {
		$post_data['post_status'] = 'private';
	}
	if ( isset( $post_data['publish'] ) && ( '' != $post_data['publish'] ) && ( ! isset( $post_data['post_status'] ) || $post_data['post_status'] != 'private' ) ) {
		$post_data['post_status'] = 'publish';
	}
	if ( isset( $post_data['advanced'] ) && '' != $post_data['advanced'] ) {
		$post_data['post_status'] = 'draft';
	}
	if ( isset( $post_data['pending'] ) && '' != $post_data['pending'] ) {
		$post_data['post_status'] = 'pending';
	}

	if ( isset( $post_data['ID'] ) ) {
		$post_id = $post_data['ID'];
	} else {
		$post_id = false;
	}
	$previous_status = $post_id ? get_post_field( 'post_status', $post_id ) : false;

	if ( isset( $post_data['post_status'] ) && 'private' == $post_data['post_status'] && ! current_user_can( $ptype->cap->publish_posts ) ) {
		$post_data['post_status'] = $previous_status ? $previous_status : 'pending';
	}

	$published_statuses = array( 'publish', 'future' );

	// Posts 'submitted for approval' present are submitted to $_POST the same as if they were being published.
	// Change status from 'publish' to 'pending' if user lacks permissions to publish or to resave published posts.
	if ( isset( $post_data['post_status'] ) && ( in_array( $post_data['post_status'], $published_statuses ) && ! current_user_can( $ptype->cap->publish_posts ) ) ) {
		if ( ! in_array( $previous_status, $published_statuses ) || ! current_user_can( 'edit_post', $post_id ) ) {
			$post_data['post_status'] = 'pending';
		}
	}

	if ( ! isset( $post_data['post_status'] ) ) {
		$post_data['post_status'] = 'auto-draft' === $previous_status ? 'draft' : $previous_status;
	}

	if ( isset( $post_data['post_password'] ) && ! current_user_can( $ptype->cap->publish_posts ) ) {
		unset( $post_data['post_password'] );
	}

	if ( ! isset( $post_data['comment_status'] ) ) {
		$post_data['comment_status'] = 'closed';
	}

	if ( ! isset( $post_data['ping_status'] ) ) {
		$post_data['ping_status'] = 'closed';
	}

	foreach ( array( 'aa', 'mm', 'jj', 'hh', 'mn' ) as $timeunit ) {
		if ( ! empty( $post_data[ 'hidden_' . $timeunit ] ) && $post_data[ 'hidden_' . $timeunit ] != $post_data[ $timeunit ] ) {
			$post_data['edit_date'] = '1';
			break;
		}
	}

	if ( ! empty( $post_data['edit_date'] ) ) {
		$aa                     = $post_data['aa'];
		$mm                     = $post_data['mm'];
		$jj                     = $post_data['jj'];
		$hh                     = $post_data['hh'];
		$mn                     = $post_data['mn'];
		$ss                     = $post_data['ss'];
		$aa                     = ( $aa <= 0 ) ? date( 'Y' ) : $aa;
		$mm                     = ( $mm <= 0 ) ? date( 'n' ) : $mm;
		$jj                     = ( $jj > 31 ) ? 31 : $jj;
		$jj                     = ( $jj <= 0 ) ? date( 'j' ) : $jj;
		$hh                     = ( $hh > 23 ) ? $hh - 24 : $hh;
		$mn                     = ( $mn > 59 ) ? $mn - 60 : $mn;
		$ss                     = ( $ss > 59 ) ? $ss - 60 : $ss;
		$post_data['post_date'] = sprintf( '%04d-%02d-%02d %02d:%02d:%02d', $aa, $mm, $jj, $hh, $mn, $ss );
		$valid_date             = wp_checkdate( $mm, $jj, $aa, $post_data['post_date'] );
		if ( ! $valid_date ) {
			return new WP_Error( 'invalid_date', __( 'Invalid date.' ) );
		}
		$post_data['post_date_gmt'] = get_gmt_from_date( $post_data['post_date'] );
	}

	if ( isset( $post_data['post_category'] ) ) {
		$category_object = get_taxonomy( 'category' );
		if ( ! current_user_can( $category_object->cap->assign_terms ) ) {
			unset( $post_data['post_category'] );
		}
	}

	return $post_data;
}

/**
 * Returns only allowed post data fields
 *
 * @since 5.0.1
 *
 * @param array $post_data Array of post data. Defaults to the contents of $_POST.
 * @return object|bool WP_Error on failure, true on success.
 */
function _wp_get_allowed_postdata( $post_data = null ) {
	if ( empty( $post_data ) ) {
		$post_data = $_POST;
	}

	// Pass through errors
	if ( is_wp_error( $post_data ) ) {
		return $post_data;
	}

	return array_diff_key( $post_data, array_flip( array( 'meta_input', 'file', 'guid' ) ) );
}

/**
 * Update an existing post with values provided in $_POST.
 *
 * @since 1.5.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param array $post_data Optional.
 * @return int Post ID.
 */
function edit_post( $post_data = null ) {
	global $wpdb;

	if ( empty( $post_data ) ) {
		$post_data = &$_POST;
	}

	// Clear out any data in internal vars.
	unset( $post_data['filter'] );

	$post_ID                     = (int) $post_data['post_ID'];
	$post                        = get_post( $post_ID );
	$post_data['post_type']      = $post->post_type;
	$post_data['post_mime_type'] = $post->post_mime_type;

	if ( ! empty( $post_data['post_status'] ) ) {
		$post_data['post_status'] = sanitize_key( $post_data['post_status'] );

		if ( 'inherit' == $post_data['post_status'] ) {
			unset( $post_data['post_status'] );
		}
	}

	$ptype = get_post_type_object( $post_data['post_type'] );
	if ( ! current_user_can( 'edit_post', $post_ID ) ) {
		if ( 'page' == $post_data['post_type'] ) {
			wp_die( __( 'Sorry, you are not allowed to edit this page.' ) );
		} else {
			wp_die( __( 'Sorry, you are not allowed to edit this post.' ) );
		}
	}

	if ( post_type_supports( $ptype->name, 'revisions' ) ) {
		$revisions = wp_get_post_revisions(
			$post_ID,
			array(
				'order'          => 'ASC',
				'posts_per_page' => 1,
			)
		);
		$revision  = current( $revisions );

		// Check if the revisions have been upgraded
		if ( $revisions && _wp_get_post_revision_version( $revision ) < 1 ) {
			_wp_upgrade_revisions_of_post( $post, wp_get_post_revisions( $post_ID ) );
		}
	}

	if ( isset( $post_data['visibility'] ) ) {
		switch ( $post_data['visibility'] ) {
			case 'public':
				$post_data['post_password'] = '';
				break;
			case 'password':
				unset( $post_data['sticky'] );
				break;
			case 'private':
				$post_data['post_status']   = 'private';
				$post_data['post_password'] = '';
				unset( $post_data['sticky'] );
				break;
		}
	}

	$post_data = _wp_translate_postdata( true, $post_data );
	if ( is_wp_error( $post_data ) ) {
		wp_die( $post_data->get_error_message() );
	}
	$translated = _wp_get_allowed_postdata( $post_data );

	// Post Formats
	if ( isset( $post_data['post_format'] ) ) {
		set_post_format( $post_ID, $post_data['post_format'] );
	}

	$format_meta_urls = array( 'url', 'link_url', 'quote_source_url' );
	foreach ( $format_meta_urls as $format_meta_url ) {
		$keyed = '_format_' . $format_meta_url;
		if ( isset( $post_data[ $keyed ] ) ) {
			update_post_meta( $post_ID, $keyed, wp_slash( esc_url_raw( wp_unslash( $post_data[ $keyed ] ) ) ) );
		}
	}

	$format_keys = array( 'quote', 'quote_source_name', 'image', 'gallery', 'audio_embed', 'video_embed' );

	foreach ( $format_keys as $key ) {
		$keyed = '_format_' . $key;
		if ( isset( $post_data[ $keyed ] ) ) {
			if ( current_user_can( 'unfiltered_html' ) ) {
				update_post_meta( $post_ID, $keyed, $post_data[ $keyed ] );
			} else {
				update_post_meta( $post_ID, $keyed, wp_filter_post_kses( $post_data[ $keyed ] ) );
			}
		}
	}

	if ( 'attachment' === $post_data['post_type'] && preg_match( '#^(audio|video)/#', $post_data['post_mime_type'] ) ) {
		$id3data = wp_get_attachment_metadata( $post_ID );
		if ( ! is_array( $id3data ) ) {
			$id3data = array();
		}

		foreach ( wp_get_attachment_id3_keys( $post, 'edit' ) as $key => $label ) {
			if ( isset( $post_data[ 'id3_' . $key ] ) ) {
				$id3data[ $key ] = sanitize_text_field( wp_unslash( $post_data[ 'id3_' . $key ] ) );
			}
		}
		wp_update_attachment_metadata( $post_ID, $id3data );
	}

	// Meta Stuff
	if ( isset( $post_data['meta'] ) && $post_data['meta'] ) {
		foreach ( $post_data['meta'] as $key => $value ) {
			if ( ! $meta = get_post_meta_by_id( $key ) ) {
				continue;
			}
			if ( $meta->post_id != $post_ID ) {
				continue;
			}
			if ( is_protected_meta( $meta->meta_key, 'post' ) || ! current_user_can( 'edit_post_meta', $post_ID, $meta->meta_key ) ) {
				continue;
			}
			if ( is_protected_meta( $value['key'], 'post' ) || ! current_user_can( 'edit_post_meta', $post_ID, $value['key'] ) ) {
				continue;
			}
			update_meta( $key, $value['key'], $value['value'] );
		}
	}

	if ( isset( $post_data['deletemeta'] ) && $post_data['deletemeta'] ) {
		foreach ( $post_data['deletemeta'] as $key => $value ) {
			if ( ! $meta = get_post_meta_by_id( $key ) ) {
				continue;
			}
			if ( $meta->post_id != $post_ID ) {
				continue;
			}
			if ( is_protected_meta( $meta->meta_key, 'post' ) || ! current_user_can( 'delete_post_meta', $post_ID, $meta->meta_key ) ) {
				continue;
			}
			delete_meta( $key );
		}
	}

	// Attachment stuff
	if ( 'attachment' == $post_data['post_type'] ) {
		if ( isset( $post_data['_wp_attachment_image_alt'] ) ) {
			$image_alt = wp_unslash( $post_data['_wp_attachment_image_alt'] );
			if ( $image_alt != get_post_meta( $post_ID, '_wp_attachment_image_alt', true ) ) {
				$image_alt = wp_strip_all_tags( $image_alt, true );
				// update_meta expects slashed.
				update_post_meta( $post_ID, '_wp_attachment_image_alt', wp_slash( $image_alt ) );
			}
		}

		$attachment_data = isset( $post_data['attachments'][ $post_ID ] ) ? $post_data['attachments'][ $post_ID ] : array();

		/** This filter is documented in wp-admin/includes/media.php */
		$translated = apply_filters( 'attachment_fields_to_save', $translated, $attachment_data );
	}

	// Convert taxonomy input to term IDs, to avoid ambiguity.
	if ( isset( $post_data['tax_input'] ) ) {
		foreach ( (array) $post_data['tax_input'] as $taxonomy => $terms ) {
			$tax_object = get_taxonomy( $taxonomy );

			if ( $tax_object && isset( $tax_object->meta_box_sanitize_cb ) ) {
				$translated['tax_input'][ $taxonomy ] = call_user_func_array( $tax_object->meta_box_sanitize_cb, array( $taxonomy, $terms ) );
			}
		}
	}

	add_meta( $post_ID );

	update_post_meta( $post_ID, '_edit_last', get_current_user_id() );

	$success = wp_update_post( $translated );
	// If the save failed, see if we can sanity check the main fields and try again
	if ( ! $success && is_callable( array( $wpdb, 'strip_invalid_text_for_column' ) ) ) {
		$fields = array( 'post_title', 'post_content', 'post_excerpt' );

		foreach ( $fields as $field ) {
			if ( isset( $translated[ $field ] ) ) {
				$translated[ $field ] = $wpdb->strip_invalid_text_for_column( $wpdb->posts, $field, $translated[ $field ] );
			}
		}

		wp_update_post( $translated );
	}

	// Now that we have an ID we can fix any attachment anchor hrefs
	_fix_attachment_links( $post_ID );

	wp_set_post_lock( $post_ID );

	if ( current_user_can( $ptype->cap->edit_others_posts ) && current_user_can( $ptype->cap->publish_posts ) ) {
		if ( ! empty( $post_data['sticky'] ) ) {
			stick_post( $post_ID );
		} else {
			unstick_post( $post_ID );
		}
	}

	return $post_ID;
}

/**
 * Process the post data for the bulk editing of posts.
 *
 * Updates all bulk edited posts/pages, adding (but not removing) tags and
 * categories. Skips pages when they would be their own parent or child.
 *
 * @since 2.7.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param array $post_data Optional, the array of post data to process if not provided will use $_POST superglobal.
 * @return array
 */
function bulk_edit_posts( $post_data = null ) {
	global $wpdb;

	if ( empty( $post_data ) ) {
		$post_data = &$_POST;
	}

	if ( isset( $post_data['post_type'] ) ) {
		$ptype = get_post_type_object( $post_data['post_type'] );
	} else {
		$ptype = get_post_type_object( 'post' );
	}

	if ( ! current_user_can( $ptype->cap->edit_posts ) ) {
		if ( 'page' == $ptype->name ) {
			wp_die( __( 'Sorry, you are not allowed to edit pages.' ) );
		} else {
			wp_die( __( 'Sorry, you are not allowed to edit posts.' ) );
		}
	}

	if ( -1 == $post_data['_status'] ) {
		$post_data['post_status'] = null;
		unset( $post_data['post_status'] );
	} else {
		$post_data['post_status'] = $post_data['_status'];
	}
	unset( $post_data['_status'] );

	if ( ! empty( $post_data['post_status'] ) ) {
		$post_data['post_status'] = sanitize_key( $post_data['post_status'] );

		if ( 'inherit' == $post_data['post_status'] ) {
			unset( $post_data['post_status'] );
		}
	}

	$post_IDs = array_map( 'intval', (array) $post_data['post'] );

	$reset = array(
		'post_author',
		'post_status',
		'post_password',
		'post_parent',
		'page_template',
		'comment_status',
		'ping_status',
		'keep_private',
		'tax_input',
		'post_category',
		'sticky',
		'post_format',
	);

	foreach ( $reset as $field ) {
		if ( isset( $post_data[ $field ] ) && ( '' == $post_data[ $field ] || -1 == $post_data[ $field ] ) ) {
			unset( $post_data[ $field ] );
		}
	}

	if ( isset( $post_data['post_category'] ) ) {
		if ( is_array( $post_data['post_category'] ) && ! empty( $post_data['post_category'] ) ) {
			$new_cats = array_map( 'absint', $post_data['post_category'] );
		} else {
			unset( $post_data['post_category'] );
		}
	}

	$tax_input = array();
	if ( isset( $post_data['tax_input'] ) ) {
		foreach ( $post_data['tax_input'] as $tax_name => $terms ) {
			if ( empty( $terms ) ) {
				continue;
			}
			if ( is_taxonomy_hierarchical( $tax_name ) ) {
				$tax_input[ $tax_name ] = array_map( 'absint', $terms );
			} else {
				$comma = _x( ',', 'tag delimiter' );
				if ( ',' !== $comma ) {
					$terms = str_replace( $comma, ',', $terms );
				}
				$tax_input[ $tax_name ] = explode( ',', trim( $terms, " \n\t\r\0\x0B," ) );
			}
		}
	}

	if ( isset( $post_data['post_parent'] ) && ( $parent = (int) $post_data['post_parent'] ) ) {
		$pages    = $wpdb->get_results( "SELECT ID, post_parent FROM $wpdb->posts WHERE post_type = 'page'" );
		$children = array();

		for ( $i = 0; $i < 50 && $parent > 0; $i++ ) {
			$children[] = $parent;

			foreach ( $pages as $page ) {
				if ( $page->ID == $parent ) {
					$parent = $page->post_parent;
					break;
				}
			}
		}
	}

	$updated          = $skipped = $locked = array();
	$shared_post_data = $post_data;

	foreach ( $post_IDs as $post_ID ) {
		// Start with fresh post data with each iteration.
		$post_data = $shared_post_data;

		$post_type_object = get_post_type_object( get_post_type( $post_ID ) );

		if ( ! isset( $post_type_object ) || ( isset( $children ) && in_array( $post_ID, $children ) ) || ! current_user_can( 'edit_post', $post_ID ) ) {
			$skipped[] = $post_ID;
			continue;
		}

		if ( wp_check_post_lock( $post_ID ) ) {
			$locked[] = $post_ID;
			continue;
		}

		$post      = get_post( $post_ID );
		$tax_names = get_object_taxonomies( $post );
		foreach ( $tax_names as $tax_name ) {
			$taxonomy_obj = get_taxonomy( $tax_name );
			if ( isset( $tax_input[ $tax_name ] ) && current_user_can( $taxonomy_obj->cap->assign_terms ) ) {
				$new_terms = $tax_input[ $tax_name ];
			} else {
				$new_terms = array();
			}

			if ( $taxonomy_obj->hierarchical ) {
				$current_terms = (array) wp_get_object_terms( $post_ID, $tax_name, array( 'fields' => 'ids' ) );
			} else {
				$current_terms = (array) wp_get_object_terms( $post_ID, $tax_name, array( 'fields' => 'names' ) );
			}

			$post_data['tax_input'][ $tax_name ] = array_merge( $current_terms, $new_terms );
		}

		if ( isset( $new_cats ) && in_array( 'category', $tax_names ) ) {
			$cats                       = (array) wp_get_post_categories( $post_ID );
			$post_data['post_category'] = array_unique( array_merge( $cats, $new_cats ) );
			unset( $post_data['tax_input']['category'] );
		}

		$post_data['post_ID']        = $post_ID;
		$post_data['post_type']      = $post->post_type;
		$post_data['post_mime_type'] = $post->post_mime_type;

		foreach ( array( 'comment_status', 'ping_status', 'post_author' ) as $field ) {
			if ( ! isset( $post_data[ $field ] ) ) {
				$post_data[ $field ] = $post->$field;
			}
		}

		$post_data = _wp_translate_postdata( true, $post_data );
		if ( is_wp_error( $post_data ) ) {
			$skipped[] = $post_ID;
			continue;
		}
		$post_data = _wp_get_allowed_postdata( $post_data );

		if ( isset( $shared_post_data['post_format'] ) ) {
			set_post_format( $post_ID, $shared_post_data['post_format'] );
		}

		// Prevent wp_insert_post() from overwriting post format with the old data.
		unset( $post_data['tax_input']['post_format'] );

		$updated[] = wp_update_post( $post_data );

		if ( isset( $post_data['sticky'] ) && current_user_can( $ptype->cap->edit_others_posts ) ) {
			if ( 'sticky' == $post_data['sticky'] ) {
				stick_post( $post_ID );
			} else {
				unstick_post( $post_ID );
			}
		}
	}

	return array(
		'updated' => $updated,
		'skipped' => $skipped,
		'locked'  => $locked,
	);
}

/**
 * Default post information to use when populating the "Write Post" form.
 *
 * @since 2.0.0
 *
 * @param string $post_type    Optional. A post type string. Default 'post'.
 * @param bool   $create_in_db Optional. Whether to insert the post into database. Default false.
 * @return WP_Post Post object containing all the default post data as attributes
 */
function get_default_post_to_edit( $post_type = 'post', $create_in_db = false ) {
	$post_title = '';
	if ( ! empty( $_REQUEST['post_title'] ) ) {
		$post_title = esc_html( wp_unslash( $_REQUEST['post_title'] ) );
	}

	$post_content = '';
	if ( ! empty( $_REQUEST['content'] ) ) {
		$post_content = esc_html( wp_unslash( $_REQUEST['content'] ) );
	}

	$post_excerpt = '';
	if ( ! empty( $_REQUEST['excerpt'] ) ) {
		$post_excerpt = esc_html( wp_unslash( $_REQUEST['excerpt'] ) );
	}

	if ( $create_in_db ) {
		$post_id = wp_insert_post(
			array(
				'post_title'  => __( 'Auto Draft' ),
				'post_type'   => $post_type,
				'post_status' => 'auto-draft',
			)
		);
		$post    = get_post( $post_id );
		if ( current_theme_supports( 'post-formats' ) && post_type_supports( $post->post_type, 'post-formats' ) && get_option( 'default_post_format' ) ) {
			set_post_format( $post, get_option( 'default_post_format' ) );
		}

		// Schedule auto-draft cleanup
		if ( ! wp_next_scheduled( 'wp_scheduled_auto_draft_delete' ) ) {
			wp_schedule_event( time(), 'daily', 'wp_scheduled_auto_draft_delete' );
		}
	} else {
		$post                 = new stdClass;
		$post->ID             = 0;
		$post->post_author    = '';
		$post->post_date      = '';
		$post->post_date_gmt  = '';
		$post->post_password  = '';
		$post->post_name      = '';
		$post->post_type      = $post_type;
		$post->post_status    = 'draft';
		$post->to_ping        = '';
		$post->pinged         = '';
		$post->comment_status = get_default_comment_status( $post_type );
		$post->ping_status    = get_default_comment_status( $post_type, 'pingback' );
		$post->post_pingback  = get_option( 'default_pingback_flag' );
		$post->post_category  = get_option( 'default_category' );
		$post->page_template  = 'default';
		$post->post_parent    = 0;
		$post->menu_order     = 0;
		$post                 = new WP_Post( $post );
	}

	/**
	 * Filters the default post content initially used in the "Write Post" form.
	 *
	 * @since 1.5.0
	 *
	 * @param string  $post_content Default post content.
	 * @param WP_Post $post         Post object.
	 */
	$post->post_content = (string) apply_filters( 'default_content', $post_content, $post );

	/**
	 * Filters the default post title initially used in the "Write Post" form.
	 *
	 * @since 1.5.0
	 *
	 * @param string  $post_title Default post title.
	 * @param WP_Post $post       Post object.
	 */
	$post->post_title = (string) apply_filters( 'default_title', $post_title, $post );

	/**
	 * Filters the default post excerpt initially used in the "Write Post" form.
	 *
	 * @since 1.5.0
	 *
	 * @param string  $post_excerpt Default post excerpt.
	 * @param WP_Post $post         Post object.
	 */
	$post->post_excerpt = (string) apply_filters( 'default_excerpt', $post_excerpt, $post );

	return $post;
}

/**
 * Determines if a post exists based on title, content, date and type.
 *
 * @since 2.0.0
 * @since 5.2.0 Added the `$type` parameter.
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $title   Post title.
 * @param string $content Optional post content.
 * @param string $date    Optional post date.
 * @param string $type    Optional post type.
 * @return int Post ID if post exists, 0 otherwise.
 */
function post_exists( $title, $content = '', $date = '', $type = '' ) {
	global $wpdb;

	$post_title   = wp_unslash( sanitize_post_field( 'post_title', $title, 0, 'db' ) );
	$post_content = wp_unslash( sanitize_post_field( 'post_content', $content, 0, 'db' ) );
	$post_date    = wp_unslash( sanitize_post_field( 'post_date', $date, 0, 'db' ) );
	$post_type    = wp_unslash( sanitize_post_field( 'post_type', $type, 0, 'db' ) );

	$query = "SELECT ID FROM $wpdb->posts WHERE 1=1";
	$args  = array();

	if ( ! empty( $date ) ) {
		$query .= ' AND post_date = %s';
		$args[] = $post_date;
	}

	if ( ! empty( $title ) ) {
		$query .= ' AND post_title = %s';
		$args[] = $post_title;
	}

	if ( ! empty( $content ) ) {
		$query .= ' AND post_content = %s';
		$args[] = $post_content;
	}

	if ( ! empty( $type ) ) {
		$query .= ' AND post_type = %s';
		$args[] = $post_type;
	}

	if ( ! empty( $args ) ) {
		return (int) $wpdb->get_var( $wpdb->prepare( $query, $args ) );
	}

	return 0;
}

/**
 * Creates a new post from the "Write Post" form using $_POST information.
 *
 * @since 2.1.0
 *
 * @global WP_User $current_user
 *
 * @return int|WP_Error
 */
function wp_write_post() {
	if ( isset( $_POST['post_type'] ) ) {
		$ptype = get_post_type_object( $_POST['post_type'] );
	} else {
		$ptype = get_post_type_object( 'post' );
	}

	if ( ! current_user_can( $ptype->cap->edit_posts ) ) {
		if ( 'page' == $ptype->name ) {
			return new WP_Error( 'edit_pages', __( 'Sorry, you are not allowed to create pages on this site.' ) );
		} else {
			return new WP_Error( 'edit_posts', __( 'Sorry, you are not allowed to create posts or drafts on this site.' ) );
		}
	}

	$_POST['post_mime_type'] = '';

	// Clear out any data in internal vars.
	unset( $_POST['filter'] );

	// Edit don't write if we have a post id.
	if ( isset( $_POST['post_ID'] ) ) {
		return edit_post();
	}

	if ( isset( $_POST['visibility'] ) ) {
		switch ( $_POST['visibility'] ) {
			case 'public':
				$_POST['post_password'] = '';
				break;
			case 'password':
				unset( $_POST['sticky'] );
				break;
			case 'private':
				$_POST['post_status']   = 'private';
				$_POST['post_password'] = '';
				unset( $_POST['sticky'] );
				break;
		}
	}

	$translated = _wp_translate_postdata( false );
	if ( is_wp_error( $translated ) ) {
		return $translated;
	}
	$translated = _wp_get_allowed_postdata( $translated );

	// Create the post.
	$post_ID = wp_insert_post( $translated );
	if ( is_wp_error( $post_ID ) ) {
		return $post_ID;
	}

	if ( empty( $post_ID ) ) {
		return 0;
	}

	add_meta( $post_ID );

	add_post_meta( $post_ID, '_edit_last', $GLOBALS['current_user']->ID );

	// Now that we have an ID we can fix any attachment anchor hrefs
	_fix_attachment_links( $post_ID );

	wp_set_post_lock( $post_ID );

	return $post_ID;
}

/**
 * Calls wp_write_post() and handles the errors.
 *
 * @since 2.0.0
 *
 * @return int|null
 */
function write_post() {
	$result = wp_write_post();
	if ( is_wp_error( $result ) ) {
		wp_die( $result->get_error_message() );
	} else {
		return $result;
	}
}

//
// Post Meta
//

/**
 * Add post meta data defined in $_POST superglobal for post with given ID.
 *
 * @since 1.2.0
 *
 * @param int $post_ID
 * @return int|bool
 */
function add_meta( $post_ID ) {
	$post_ID = (int) $post_ID;

	$metakeyselect = isset( $_POST['metakeyselect'] ) ? wp_unslash( trim( $_POST['metakeyselect'] ) ) : '';
	$metakeyinput  = isset( $_POST['metakeyinput'] ) ? wp_unslash( trim( $_POST['metakeyinput'] ) ) : '';
	$metavalue     = isset( $_POST['metavalue'] ) ? $_POST['metavalue'] : '';
	if ( is_string( $metavalue ) ) {
		$metavalue = trim( $metavalue );
	}

	if ( ( ( '#NONE#' != $metakeyselect ) && ! empty( $metakeyselect ) ) || ! empty( $metakeyinput ) ) {
		/*
		 * We have a key/value pair. If both the select and the input
		 * for the key have data, the input takes precedence.
		 */
		if ( '#NONE#' != $metakeyselect ) {
			$metakey = $metakeyselect;
		}

		if ( $metakeyinput ) {
			$metakey = $metakeyinput; // default
		}

		if ( is_protected_meta( $metakey, 'post' ) || ! current_user_can( 'add_post_meta', $post_ID, $metakey ) ) {
			return false;
		}

		$metakey = wp_slash( $metakey );

		return add_post_meta( $post_ID, $metakey, $metavalue );
	}

	return false;
} // add_meta

/**
 * Delete post meta data by meta ID.
 *
 * @since 1.2.0
 *
 * @param int $mid
 * @return bool
 */
function delete_meta( $mid ) {
	return delete_metadata_by_mid( 'post', $mid );
}

/**
 * Get a list of previously defined keys.
 *
 * @since 1.2.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @return mixed
 */
function get_meta_keys() {
	global $wpdb;

	$keys = $wpdb->get_col(
		"
			SELECT meta_key
			FROM $wpdb->postmeta
			GROUP BY meta_key
			ORDER BY meta_key"
	);

	return $keys;
}

/**
 * Get post meta data by meta ID.
 *
 * @since 2.1.0
 *
 * @param int $mid
 * @return object|bool
 */
function get_post_meta_by_id( $mid ) {
	return get_metadata_by_mid( 'post', $mid );
}

/**
 * Get meta data for the given post ID.
 *
 * @since 1.2.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int $postid
 * @return mixed
 */
function has_meta( $postid ) {
	global $wpdb;

	return $wpdb->get_results(
		$wpdb->prepare(
			"SELECT meta_key, meta_value, meta_id, post_id
			FROM $wpdb->postmeta WHERE post_id = %d
			ORDER BY meta_key,meta_id",
			$postid
		),
		ARRAY_A
	);
}

/**
 * Update post meta data by meta ID.
 *
 * @since 1.2.0
 *
 * @param int    $meta_id
 * @param string $meta_key Expect Slashed
 * @param string $meta_value Expect Slashed
 * @return bool
 */
function update_meta( $meta_id, $meta_key, $meta_value ) {
	$meta_key   = wp_unslash( $meta_key );
	$meta_value = wp_unslash( $meta_value );

	return update_metadata_by_mid( 'post', $meta_id, $meta_value, $meta_key );
}

//
// Private
//

/**
 * Replace hrefs of attachment anchors with up-to-date permalinks.
 *
 * @since 2.3.0
 * @access private
 *
 * @param int|object $post Post ID or post object.
 * @return void|int|WP_Error Void if nothing fixed. 0 or WP_Error on update failure. The post ID on update success.
 */
function _fix_attachment_links( $post ) {
	$post    = get_post( $post, ARRAY_A );
	$content = $post['post_content'];

	// Don't run if no pretty permalinks or post is not published, scheduled, or privately published.
	if ( ! get_option( 'permalink_structure' ) || ! in_array( $post['post_status'], array( 'publish', 'future', 'private' ) ) ) {
		return;
	}

	// Short if there aren't any links or no '?attachment_id=' strings (strpos cannot be zero)
	if ( ! strpos( $content, '?attachment_id=' ) || ! preg_match_all( '/<a ([^>]+)>[\s\S]+?<\/a>/', $content, $link_matches ) ) {
		return;
	}

	$site_url = get_bloginfo( 'url' );
	$site_url = substr( $site_url, (int) strpos( $site_url, '://' ) ); // remove the http(s)
	$replace  = '';

	foreach ( $link_matches[1] as $key => $value ) {
		if ( ! strpos( $value, '?attachment_id=' ) || ! strpos( $value, 'wp-att-' )
			|| ! preg_match( '/href=(["\'])[^"\']*\?attachment_id=(\d+)[^"\']*\\1/', $value, $url_match )
			|| ! preg_match( '/rel=["\'][^"\']*wp-att-(\d+)/', $value, $rel_match ) ) {
				continue;
		}

		$quote  = $url_match[1]; // the quote (single or double)
		$url_id = (int) $url_match[2];
		$rel_id = (int) $rel_match[1];

		if ( ! $url_id || ! $rel_id || $url_id != $rel_id || strpos( $url_match[0], $site_url ) === false ) {
			continue;
		}

		$link    = $link_matches[0][ $key ];
		$replace = str_replace( $url_match[0], 'href=' . $quote . get_attachment_link( $url_id ) . $quote, $link );

		$content = str_replace( $link, $replace, $content );
	}

	if ( $replace ) {
		$post['post_content'] = $content;
		// Escape data pulled from DB.
		$post = add_magic_quotes( $post );

		return wp_update_post( $post );
	}
}

/**
 * Get all the possible statuses for a post_type
 *
 * @since 2.5.0
 *
 * @param string $type The post_type you want the statuses for
 * @return array As array of all the statuses for the supplied post type
 */
function get_available_post_statuses( $type = 'post' ) {
	$stati = wp_count_posts( $type );

	return array_keys( get_object_vars( $stati ) );
}

/**
 * Run the wp query to fetch the posts for listing on the edit posts page
 *
 * @since 2.5.0
 *
 * @param array|bool $q Array of query variables to use to build the query or false to use $_GET superglobal.
 * @return array
 */
function wp_edit_posts_query( $q = false ) {
	if ( false === $q ) {
		$q = $_GET;
	}
	$q['m']     = isset( $q['m'] ) ? (int) $q['m'] : 0;
	$q['cat']   = isset( $q['cat'] ) ? (int) $q['cat'] : 0;
	$post_stati = get_post_stati();

	if ( isset( $q['post_type'] ) && in_array( $q['post_type'], get_post_types() ) ) {
		$post_type = $q['post_type'];
	} else {
		$post_type = 'post';
	}

	$avail_post_stati = get_available_post_statuses( $post_type );
	$post_status      = '';
	$perm             = '';

	if ( isset( $q['post_status'] ) && in_array( $q['post_status'], $post_stati ) ) {
		$post_status = $q['post_status'];
		$perm        = 'readable';
	}

	$orderby = '';

	if ( isset( $q['orderby'] ) ) {
		$orderby = $q['orderby'];
	} elseif ( isset( $q['post_status'] ) && in_array( $q['post_status'], array( 'pending', 'draft' ) ) ) {
		$orderby = 'modified';
	}

	$order = '';

	if ( isset( $q['order'] ) ) {
		$order = $q['order'];
	} elseif ( isset( $q['post_status'] ) && 'pending' == $q['post_status'] ) {
		$order = 'ASC';
	}

	$per_page       = "edit_{$post_type}_per_page";
	$posts_per_page = (int) get_user_option( $per_page );
	if ( empty( $posts_per_page ) || $posts_per_page < 1 ) {
		$posts_per_page = 20;
	}

	/**
	 * Filters the number of items per page to show for a specific 'per_page' type.
	 *
	 * The dynamic portion of the hook name, `$post_type`, refers to the post type.
	 *
	 * Some examples of filter hooks generated here include: 'edit_attachment_per_page',
	 * 'edit_post_per_page', 'edit_page_per_page', etc.
	 *
	 * @since 3.0.0
	 *
	 * @param int $posts_per_page Number of posts to display per page for the given post
	 *                            type. Default 20.
	 */
	$posts_per_page = apply_filters( "edit_{$post_type}_per_page", $posts_per_page );

	/**
	 * Filters the number of posts displayed per page when specifically listing "posts".
	 *
	 * @since 2.8.0
	 *
	 * @param int    $posts_per_page Number of posts to be displayed. Default 20.
	 * @param string $post_type      The post type.
	 */
	$posts_per_page = apply_filters( 'edit_posts_per_page', $posts_per_page, $post_type );

	$query = compact( 'post_type', 'post_status', 'perm', 'order', 'orderby', 'posts_per_page' );

	// Hierarchical types require special args.
	if ( is_post_type_hierarchical( $post_type ) && empty( $orderby ) ) {
		$query['orderby']                = 'menu_order title';
		$query['order']                  = 'asc';
		$query['posts_per_page']         = -1;
		$query['posts_per_archive_page'] = -1;
		$query['fields']                 = 'id=>parent';
	}

	if ( ! empty( $q['show_sticky'] ) ) {
		$query['post__in'] = (array) get_option( 'sticky_posts' );
	}

	wp( $query );

	return $avail_post_stati;
}

/**
 * Get the query variables for the current attachments request.
 *
 * @since 4.2.0
 *
 * @param array|false $q Optional. Array of query variables to use to build the query or false
 *                       to use $_GET superglobal. Default false.
 * @return array The parsed query vars.
 */
function wp_edit_attachments_query_vars( $q = false ) {
	if ( false === $q ) {
		$q = $_GET;
	}
	$q['m']         = isset( $q['m'] ) ? (int) $q['m'] : 0;
	$q['cat']       = isset( $q['cat'] ) ? (int) $q['cat'] : 0;
	$q['post_type'] = 'attachment';
	$post_type      = get_post_type_object( 'attachment' );
	$states         = 'inherit';
	if ( current_user_can( $post_type->cap->read_private_posts ) ) {
		$states .= ',private';
	}

	$q['post_status'] = isset( $q['status'] ) && 'trash' == $q['status'] ? 'trash' : $states;
	$q['post_status'] = isset( $q['attachment-filter'] ) && 'trash' == $q['attachment-filter'] ? 'trash' : $states;

	$media_per_page = (int) get_user_option( 'upload_per_page' );
	if ( empty( $media_per_page ) || $media_per_page < 1 ) {
		$media_per_page = 20;
	}

	/**
	 * Filters the number of items to list per page when listing media items.
	 *
	 * @since 2.9.0
	 *
	 * @param int $media_per_page Number of media to list. Default 20.
	 */
	$q['posts_per_page'] = apply_filters( 'upload_per_page', $media_per_page );

	$post_mime_types = get_post_mime_types();
	if ( isset( $q['post_mime_type'] ) && ! array_intersect( (array) $q['post_mime_type'], array_keys( $post_mime_types ) ) ) {
		unset( $q['post_mime_type'] );
	}

	foreach ( array_keys( $post_mime_types ) as $type ) {
		if ( isset( $q['attachment-filter'] ) && "post_mime_type:$type" == $q['attachment-filter'] ) {
			$q['post_mime_type'] = $type;
			break;
		}
	}

	if ( isset( $q['detached'] ) || ( isset( $q['attachment-filter'] ) && 'detached' == $q['attachment-filter'] ) ) {
		$q['post_parent'] = 0;
	}

	if ( isset( $q['mine'] ) || ( isset( $q['attachment-filter'] ) && 'mine' == $q['attachment-filter'] ) ) {
		$q['author'] = get_current_user_id();
	}

	// Filter query clauses to include filenames.
	if ( isset( $q['s'] ) ) {
		add_filter( 'wp_allow_query_attachment_by_filename', '__return_true' );
	}

	return $q;
}

/**
 * Executes a query for attachments. An array of WP_Query arguments
 * can be passed in, which will override the arguments set by this function.
 *
 * @since 2.5.0
 *
 * @param array|false $q Array of query variables to use to build the query or false to use $_GET superglobal.
 * @return array
 */
function wp_edit_attachments_query( $q = false ) {
	wp( wp_edit_attachments_query_vars( $q ) );

	$post_mime_types       = get_post_mime_types();
	$avail_post_mime_types = get_available_post_mime_types( 'attachment' );

	return array( $post_mime_types, $avail_post_mime_types );
}

/**
 * Returns the list of classes to be used by a meta box.
 *
 * @since 2.5.0
 *
 * @param string $box_id    Meta box ID (used in the 'id' attribute for the meta box).
 * @param string $screen_id The screen on which the meta box is shown.
 * @return string Space-separated string of class names.
 */
function postbox_classes( $box_id, $screen_id ) {
	if ( isset( $_GET['edit'] ) && $_GET['edit'] == $box_id ) {
		$classes = array( '' );
	} elseif ( $closed = get_user_option( 'closedpostboxes_' . $screen_id ) ) {
		if ( ! is_array( $closed ) ) {
			$classes = array( '' );
		} else {
			$classes = in_array( $box_id, $closed ) ? array( 'closed' ) : array( '' );
		}
	} else {
		$classes = array( '' );
	}

	/**
	 * Filters the postbox classes for a specific screen and box ID combo.
	 *
	 * The dynamic portions of the hook name, `$screen_id` and `$box_id`, refer to
	 * the screen ID and meta box ID, respectively.
	 *
	 * @since 3.2.0
	 *
	 * @param string[] $classes An array of postbox classes.
	 */
	$classes = apply_filters( "postbox_classes_{$screen_id}_{$box_id}", $classes );
	return implode( ' ', $classes );
}

/**
 * Get a sample permalink based off of the post name.
 *
 * @since 2.5.0
 *
 * @param int    $id    Post ID or post object.
 * @param string $title Optional. Title to override the post's current title when generating the post name. Default null.
 * @param string $name  Optional. Name to override the post name. Default null.
 * @return array Array containing the sample permalink with placeholder for the post name, and the post name.
 */
function get_sample_permalink( $id, $title = null, $name = null ) {
	$post = get_post( $id );
	if ( ! $post ) {
		return array( '', '' );
	}

	$ptype = get_post_type_object( $post->post_type );

	$original_status = $post->post_status;
	$original_date   = $post->post_date;
	$original_name   = $post->post_name;

	// Hack: get_permalink() would return ugly permalink for drafts, so we will fake that our post is published.
	if ( in_array( $post->post_status, array( 'draft', 'pending', 'future' ) ) ) {
		$post->post_status = 'publish';
		$post->post_name   = sanitize_title( $post->post_name ? $post->post_name : $post->post_title, $post->ID );
	}

	// If the user wants to set a new name -- override the current one
	// Note: if empty name is supplied -- use the title instead, see #6072
	if ( ! is_null( $name ) ) {
		$post->post_name = sanitize_title( $name ? $name : $title, $post->ID );
	}

	$post->post_name = wp_unique_post_slug( $post->post_name, $post->ID, $post->post_status, $post->post_type, $post->post_parent );

	$post->filter = 'sample';

	$permalink = get_permalink( $post, true );

	// Replace custom post_type Token with generic pagename token for ease of use.
	$permalink = str_replace( "%$post->post_type%", '%pagename%', $permalink );

	// Handle page hierarchy
	if ( $ptype->hierarchical ) {
		$uri = get_page_uri( $post );
		if ( $uri ) {
			$uri = untrailingslashit( $uri );
			$uri = strrev( stristr( strrev( $uri ), '/' ) );
			$uri = untrailingslashit( $uri );
		}

		/** This filter is documented in wp-admin/edit-tag-form.php */
		$uri = apply_filters( 'editable_slug', $uri, $post );
		if ( ! empty( $uri ) ) {
			$uri .= '/';
		}
		$permalink = str_replace( '%pagename%', "{$uri}%pagename%", $permalink );
	}

	/** This filter is documented in wp-admin/edit-tag-form.php */
	$permalink         = array( $permalink, apply_filters( 'editable_slug', $post->post_name, $post ) );
	$post->post_status = $original_status;
	$post->post_date   = $original_date;
	$post->post_name   = $original_name;
	unset( $post->filter );

	/**
	 * Filters the sample permalink.
	 *
	 * @since 4.4.0
	 *
	 * @param array   $permalink Array containing the sample permalink with placeholder for the post name, and the post name.
	 * @param int     $post_id   Post ID.
	 * @param string  $title     Post title.
	 * @param string  $name      Post name (slug).
	 * @param WP_Post $post      Post object.
	 */
	return apply_filters( 'get_sample_permalink', $permalink, $post->ID, $title, $name, $post );
}

/**
 * Returns the HTML of the sample permalink slug editor.
 *
 * @since 2.5.0
 *
 * @param int    $id        Post ID or post object.
 * @param string $new_title Optional. New title. Default null.
 * @param string $new_slug  Optional. New slug. Default null.
 * @return string The HTML of the sample permalink slug editor.
 */
function get_sample_permalink_html( $id, $new_title = null, $new_slug = null ) {
	$post = get_post( $id );
	if ( ! $post ) {
		return '';
	}

	list($permalink, $post_name) = get_sample_permalink( $post->ID, $new_title, $new_slug );

	$view_link      = false;
	$preview_target = '';

	if ( current_user_can( 'read_post', $post->ID ) ) {
		if ( 'draft' === $post->post_status || empty( $post->post_name ) ) {
			$view_link      = get_preview_post_link( $post );
			$preview_target = " target='wp-preview-{$post->ID}'";
		} else {
			if ( 'publish' === $post->post_status || 'attachment' === $post->post_type ) {
				$view_link = get_permalink( $post );
			} else {
				// Allow non-published (private, future) to be viewed at a pretty permalink, in case $post->post_name is set
				$view_link = str_replace( array( '%pagename%', '%postname%' ), $post->post_name, $permalink );
			}
		}
	}

	// Permalinks without a post/page name placeholder don't have anything to edit
	if ( false === strpos( $permalink, '%postname%' ) && false === strpos( $permalink, '%pagename%' ) ) {
		$return = '<strong>' . __( 'Permalink:' ) . "</strong>\n";

		if ( false !== $view_link ) {
			$display_link = urldecode( $view_link );
			$return      .= '<a id="sample-permalink" href="' . esc_url( $view_link ) . '"' . $preview_target . '>' . esc_html( $display_link ) . "</a>\n";
		} else {
			$return .= '<span id="sample-permalink">' . $permalink . "</span>\n";
		}

		// Encourage a pretty permalink setting
		if ( '' == get_option( 'permalink_structure' ) && current_user_can( 'manage_options' ) && ! ( 'page' == get_option( 'show_on_front' ) && $id == get_option( 'page_on_front' ) ) ) {
			$return .= '<span id="change-permalinks"><a href="options-permalink.php" class="button button-small" target="_blank">' . __( 'Change Permalinks' ) . "</a></span>\n";
		}
	} else {
		if ( mb_strlen( $post_name ) > 34 ) {
			$post_name_abridged = mb_substr( $post_name, 0, 16 ) . '&hellip;' . mb_substr( $post_name, -16 );
		} else {
			$post_name_abridged = $post_name;
		}

		$post_name_html = '<span id="editable-post-name">' . esc_html( $post_name_abridged ) . '</span>';
		$display_link   = str_replace( array( '%pagename%', '%postname%' ), $post_name_html, esc_html( urldecode( $permalink ) ) );

		$return  = '<strong>' . __( 'Permalink:' ) . "</strong>\n";
		$return .= '<span id="sample-permalink"><a href="' . esc_url( $view_link ) . '"' . $preview_target . '>' . $display_link . "</a></span>\n";
		$return .= '&lrm;'; // Fix bi-directional text display defect in RTL languages.
		$return .= '<span id="edit-slug-buttons"><button type="button" class="edit-slug button button-small hide-if-no-js" aria-label="' . __( 'Edit permalink' ) . '">' . __( 'Edit' ) . "</button></span>\n";
		$return .= '<span id="editable-post-name-full">' . esc_html( $post_name ) . "</span>\n";
	}

	/**
	 * Filters the sample permalink HTML markup.
	 *
	 * @since 2.9.0
	 * @since 4.4.0 Added `$post` parameter.
	 *
	 * @param string  $return    Sample permalink HTML markup.
	 * @param int     $post_id   Post ID.
	 * @param string  $new_title New sample permalink title.
	 * @param string  $new_slug  New sample permalink slug.
	 * @param WP_Post $post      Post object.
	 */
	$return = apply_filters( 'get_sample_permalink_html', $return, $post->ID, $new_title, $new_slug, $post );

	return $return;
}

/**
 * Output HTML for the post thumbnail meta-box.
 *
 * @since 2.9.0
 *
 * @param int $thumbnail_id ID of the attachment used for thumbnail
 * @param mixed $post The post ID or object associated with the thumbnail, defaults to global $post.
 * @return string html
 */
function _wp_post_thumbnail_html( $thumbnail_id = null, $post = null ) {
	$_wp_additional_image_sizes = wp_get_additional_image_sizes();

	$post               = get_post( $post );
	$post_type_object   = get_post_type_object( $post->post_type );
	$set_thumbnail_link = '<p class="hide-if-no-js"><a href="%s" id="set-post-thumbnail"%s class="thickbox">%s</a></p>';
	$upload_iframe_src  = get_upload_iframe_src( 'image', $post->ID );

	$content = sprintf(
		$set_thumbnail_link,
		esc_url( $upload_iframe_src ),
		'', // Empty when there's no featured image set, `aria-describedby` attribute otherwise.
		esc_html( $post_type_object->labels->set_featured_image )
	);

	if ( $thumbnail_id && get_post( $thumbnail_id ) ) {
		$size = isset( $_wp_additional_image_sizes['post-thumbnail'] ) ? 'post-thumbnail' : array( 266, 266 );

		/**
		 * Filters the size used to display the post thumbnail image in the 'Featured Image' meta box.
		 *
		 * Note: When a theme adds 'post-thumbnail' support, a special 'post-thumbnail'
		 * image size is registered, which differs from the 'thumbnail' image size
		 * managed via the Settings > Media screen. See the `$size` parameter description
		 * for more information on default values.
		 *
		 * @since 4.4.0
		 *
		 * @param string|array $size         Post thumbnail image size to display in the meta box. Accepts any valid
		 *                                   image size, or an array of width and height values in pixels (in that order).
		 *                                   If the 'post-thumbnail' size is set, default is 'post-thumbnail'. Otherwise,
		 *                                   default is an array with 266 as both the height and width values.
		 * @param int          $thumbnail_id Post thumbnail attachment ID.
		 * @param WP_Post      $post         The post object associated with the thumbnail.
		 */
		$size = apply_filters( 'admin_post_thumbnail_size', $size, $thumbnail_id, $post );

		$thumbnail_html = wp_get_attachment_image( $thumbnail_id, $size );

		if ( ! empty( $thumbnail_html ) ) {
			$content  = sprintf(
				$set_thumbnail_link,
				esc_url( $upload_iframe_src ),
				' aria-describedby="set-post-thumbnail-desc"',
				$thumbnail_html
			);
			$content .= '<p class="hide-if-no-js howto" id="set-post-thumbnail-desc">' . __( 'Click the image to edit or update' ) . '</p>';
			$content .= '<p class="hide-if-no-js"><a href="#" id="remove-post-thumbnail">' . esc_html( $post_type_object->labels->remove_featured_image ) . '</a></p>';
		}
	}

	$content .= '<input type="hidden" id="_thumbnail_id" name="_thumbnail_id" value="' . esc_attr( $thumbnail_id ? $thumbnail_id : '-1' ) . '" />';

	/**
	 * Filters the admin post thumbnail HTML markup to return.
	 *
	 * @since 2.9.0
	 * @since 3.5.0 Added the `$post_id` parameter.
	 * @since 4.6.0 Added the `$thumbnail_id` parameter.
	 *
	 * @param string   $content      Admin post thumbnail HTML markup.
	 * @param int      $post_id      Post ID.
	 * @param int|null $thumbnail_id Thumbnail attachment ID, or null if there isn't one.
	 */
	return apply_filters( 'admin_post_thumbnail_html', $content, $post->ID, $thumbnail_id );
}

/**
 * Check to see if the post is currently being edited by another user.
 *
 * @since 2.5.0
 *
 * @param int $post_id ID of the post to check for editing.
 * @return int|false ID of the user with lock. False if the post does not exist, post is not locked,
 *                   the user with lock does not exist, or the post is locked by current user.
 */
function wp_check_post_lock( $post_id ) {
	if ( ! $post = get_post( $post_id ) ) {
		return false;
	}

	if ( ! $lock = get_post_meta( $post->ID, '_edit_lock', true ) ) {
		return false;
	}

	$lock = explode( ':', $lock );
	$time = $lock[0];
	$user = isset( $lock[1] ) ? $lock[1] : get_post_meta( $post->ID, '_edit_last', true );

	if ( ! get_userdata( $user ) ) {
		return false;
	}

	/** This filter is documented in wp-admin/includes/ajax-actions.php */
	$time_window = apply_filters( 'wp_check_post_lock_window', 150 );

	if ( $time && $time > time() - $time_window && $user != get_current_user_id() ) {
		return $user;
	}

	return false;
}

/**
 * Mark the post as currently being edited by the current user
 *
 * @since 2.5.0
 *
 * @param int $post_id ID of the post being edited.
 * @return array|false Array of the lock time and user ID. False if the post does not exist, or
 *                     there is no current user.
 */
function wp_set_post_lock( $post_id ) {
	if ( ! $post = get_post( $post_id ) ) {
		return false;
	}

	if ( 0 == ( $user_id = get_current_user_id() ) ) {
		return false;
	}

	$now  = time();
	$lock = "$now:$user_id";

	update_post_meta( $post->ID, '_edit_lock', $lock );

	return array( $now, $user_id );
}

/**
 * Outputs the HTML for the notice to say that someone else is editing or has taken over editing of this post.
 *
 * @since 2.8.5
 * @return none
 */
function _admin_notice_post_locked() {
	if ( ! $post = get_post() ) {
		return;
	}

	$user = null;
	if ( $user_id = wp_check_post_lock( $post->ID ) ) {
		$user = get_userdata( $user_id );
	}

	if ( $user ) {

		/**
		 * Filters whether to show the post locked dialog.
		 *
		 * Returning a falsey value to the filter will short-circuit displaying the dialog.
		 *
		 * @since 3.6.0
		 *
		 * @param bool         $display Whether to display the dialog. Default true.
		 * @param WP_Post      $post    Post object.
		 * @param WP_User|bool $user    WP_User object on success, false otherwise.
		 */
		if ( ! apply_filters( 'show_post_locked_dialog', true, $post, $user ) ) {
			return;
		}

		$locked = true;
	} else {
		$locked = false;
	}

	if ( $locked && ( $sendback = wp_get_referer() ) &&
		false === strpos( $sendback, 'post.php' ) && false === strpos( $sendback, 'post-new.php' ) ) {

		$sendback_text = __( 'Go back' );
	} else {
		$sendback = admin_url( 'edit.php' );

		if ( 'post' != $post->post_type ) {
			$sendback = add_query_arg( 'post_type', $post->post_type, $sendback );
		}

		$sendback_text = get_post_type_object( $post->post_type )->labels->all_items;
	}

	$hidden = $locked ? '' : ' hidden';

	?>
	<div id="post-lock-dialog" class="notification-dialog-wrap<?php echo $hidden; ?>">
	<div class="notification-dialog-background"></div>
	<div class="notification-dialog">
	<?php

	if ( $locked ) {
		$query_args = array();
		if ( get_post_type_object( $post->post_type )->public ) {
			if ( 'publish' == $post->post_status || $user->ID != $post->post_author ) {
				// Latest content is in autosave
				$nonce                       = wp_create_nonce( 'post_preview_' . $post->ID );
				$query_args['preview_id']    = $post->ID;
				$query_args['preview_nonce'] = $nonce;
			}
		}

		$preview_link = get_preview_post_link( $post->ID, $query_args );

		/**
		 * Filters whether to allow the post lock to be overridden.
		 *
		 * Returning a falsey value to the filter will disable the ability
		 * to override the post lock.
		 *
		 * @since 3.6.0
		 *
		 * @param bool    $override Whether to allow overriding post locks. Default true.
		 * @param WP_Post $post     Post object.
		 * @param WP_User $user     User object.
		 */
		$override = apply_filters( 'override_post_lock', true, $post, $user );
		$tab_last = $override ? '' : ' wp-tab-last';

		?>
		<div class="post-locked-message">
		<div class="post-locked-avatar"><?php echo get_avatar( $user->ID, 64 ); ?></div>
		<p class="currently-editing wp-tab-first" tabindex="0">
		<?php
		if ( $override ) {
			/* translators: %s: user's display name */
			printf( __( '%s is already editing this post. Do you want to take over?' ), esc_html( $user->display_name ) );
		} else {
			/* translators: %s: user's display name */
			printf( __( '%s is already editing this post.' ), esc_html( $user->display_name ) );
		}
		?>
		</p>
		<?php
		/**
		 * Fires inside the post locked dialog before the buttons are displayed.
		 *
		 * @since 3.6.0
		 *
		 * @param WP_Post $post Post object.
		 */
		do_action( 'post_locked_dialog', $post );
		?>
		<p>
		<a class="button" href="<?php echo esc_url( $sendback ); ?>"><?php echo $sendback_text; ?></a>
		<?php if ( $preview_link ) { ?>
		<a class="button<?php echo $tab_last; ?>" href="<?php echo esc_url( $preview_link ); ?>"><?php _e( 'Preview' ); ?></a>
			<?php
		}

		// Allow plugins to prevent some users overriding the post lock
		if ( $override ) {
			?>
	<a class="button button-primary wp-tab-last" href="<?php echo esc_url( add_query_arg( 'get-post-lock', '1', wp_nonce_url( get_edit_post_link( $post->ID, 'url' ), 'lock-post_' . $post->ID ) ) ); ?>"><?php _e( 'Take over' ); ?></a>
			<?php
		}

		?>
		</p>
		</div>
		<?php
	} else {
		?>
		<div class="post-taken-over">
			<div class="post-locked-avatar"></div>
			<p class="wp-tab-first" tabindex="0">
			<span class="currently-editing"></span><br />
			<span class="locked-saving hidden"><img src="<?php echo esc_url( admin_url( 'images/spinner-2x.gif' ) ); ?>" width="16" height="16" alt="" /> <?php _e( 'Saving revision&hellip;' ); ?></span>
			<span class="locked-saved hidden"><?php _e( 'Your latest changes were saved as a revision.' ); ?></span>
			</p>
			<?php
			/**
			 * Fires inside the dialog displayed when a user has lost the post lock.
			 *
			 * @since 3.6.0
			 *
			 * @param WP_Post $post Post object.
			 */
			do_action( 'post_lock_lost_dialog', $post );
			?>
			<p><a class="button button-primary wp-tab-last" href="<?php echo esc_url( $sendback ); ?>"><?php echo $sendback_text; ?></a></p>
		</div>
		<?php
	}

	?>
	</div>
	</div>
	<?php
}

/**
 * Creates autosave data for the specified post from $_POST data.
 *
 * @since 2.6.0
 *
 * @param mixed $post_data Associative array containing the post data or int post ID.
 * @return mixed The autosave revision ID. WP_Error or 0 on error.
 */
function wp_create_post_autosave( $post_data ) {
	if ( is_numeric( $post_data ) ) {
		$post_id   = $post_data;
		$post_data = $_POST;
	} else {
		$post_id = (int) $post_data['post_ID'];
	}

	$post_data = _wp_translate_postdata( true, $post_data );
	if ( is_wp_error( $post_data ) ) {
		return $post_data;
	}
	$post_data = _wp_get_allowed_postdata( $post_data );

	$post_author = get_current_user_id();

	// Store one autosave per author. If there is already an autosave, overwrite it.
	if ( $old_autosave = wp_get_post_autosave( $post_id, $post_author ) ) {
		$new_autosave                = _wp_post_revision_data( $post_data, true );
		$new_autosave['ID']          = $old_autosave->ID;
		$new_autosave['post_author'] = $post_author;

		// If the new autosave has the same content as the post, delete the autosave.
		$post                  = get_post( $post_id );
		$autosave_is_different = false;
		foreach ( array_intersect( array_keys( $new_autosave ), array_keys( _wp_post_revision_fields( $post ) ) ) as $field ) {
			if ( normalize_whitespace( $new_autosave[ $field ] ) != normalize_whitespace( $post->$field ) ) {
				$autosave_is_different = true;
				break;
			}
		}

		if ( ! $autosave_is_different ) {
			wp_delete_post_revision( $old_autosave->ID );
			return 0;
		}

		/**
		 * Fires before an autosave is stored.
		 *
		 * @since 4.1.0
		 *
		 * @param array $new_autosave Post array - the autosave that is about to be saved.
		 */
		do_action( 'wp_creating_autosave', $new_autosave );

		return wp_update_post( $new_autosave );
	}

	// _wp_put_post_revision() expects unescaped.
	$post_data = wp_unslash( $post_data );

	// Otherwise create the new autosave as a special post revision
	return _wp_put_post_revision( $post_data, true );
}

/**
 * Saves a draft or manually autosaves for the purpose of showing a post preview.
 *
 * @since 2.7.0
 *
 * @return string URL to redirect to show the preview.
 */
function post_preview() {

	$post_ID     = (int) $_POST['post_ID'];
	$_POST['ID'] = $post_ID;

	if ( ! $post = get_post( $post_ID ) ) {
		wp_die( __( 'Sorry, you are not allowed to edit this post.' ) );
	}

	if ( ! current_user_can( 'edit_post', $post->ID ) ) {
		wp_die( __( 'Sorry, you are not allowed to edit this post.' ) );
	}

	$is_autosave = false;

	if ( ! wp_check_post_lock( $post->ID ) && get_current_user_id() == $post->post_author && ( 'draft' == $post->post_status || 'auto-draft' == $post->post_status ) ) {
		$saved_post_id = edit_post();
	} else {
		$is_autosave = true;

		if ( isset( $_POST['post_status'] ) && 'auto-draft' == $_POST['post_status'] ) {
			$_POST['post_status'] = 'draft';
		}

		$saved_post_id = wp_create_post_autosave( $post->ID );
	}

	if ( is_wp_error( $saved_post_id ) ) {
		wp_die( $saved_post_id->get_error_message() );
	}

	$query_args = array();

	if ( $is_autosave && $saved_post_id ) {
		$query_args['preview_id']    = $post->ID;
		$query_args['preview_nonce'] = wp_create_nonce( 'post_preview_' . $post->ID );

		if ( isset( $_POST['post_format'] ) ) {
			$query_args['post_format'] = empty( $_POST['post_format'] ) ? 'standard' : sanitize_key( $_POST['post_format'] );
		}

		if ( isset( $_POST['_thumbnail_id'] ) ) {
			$query_args['_thumbnail_id'] = ( intval( $_POST['_thumbnail_id'] ) <= 0 ) ? '-1' : intval( $_POST['_thumbnail_id'] );
		}
	}

	return get_preview_post_link( $post, $query_args );
}

/**
 * Save a post submitted with XHR
 *
 * Intended for use with heartbeat and autosave.js
 *
 * @since 3.9.0
 *
 * @param array $post_data Associative array of the submitted post data.
 * @return mixed The value 0 or WP_Error on failure. The saved post ID on success.
 *               The ID can be the draft post_id or the autosave revision post_id.
 */
function wp_autosave( $post_data ) {
	// Back-compat
	if ( ! defined( 'DOING_AUTOSAVE' ) ) {
		define( 'DOING_AUTOSAVE', true );
	}

	$post_id         = (int) $post_data['post_id'];
	$post_data['ID'] = $post_data['post_ID'] = $post_id;

	if ( false === wp_verify_nonce( $post_data['_wpnonce'], 'update-post_' . $post_id ) ) {
		return new WP_Error( 'invalid_nonce', __( 'Error while saving.' ) );
	}

	$post = get_post( $post_id );

	if ( ! current_user_can( 'edit_post', $post->ID ) ) {
		return new WP_Error( 'edit_posts', __( 'Sorry, you are not allowed to edit this item.' ) );
	}

	if ( 'auto-draft' == $post->post_status ) {
		$post_data['post_status'] = 'draft';
	}

	if ( $post_data['post_type'] != 'page' && ! empty( $post_data['catslist'] ) ) {
		$post_data['post_category'] = explode( ',', $post_data['catslist'] );
	}

	if ( ! wp_check_post_lock( $post->ID ) && get_current_user_id() == $post->post_author && ( 'auto-draft' == $post->post_status || 'draft' == $post->post_status ) ) {
		// Drafts and auto-drafts are just overwritten by autosave for the same user if the post is not locked
		return edit_post( wp_slash( $post_data ) );
	} else {
		// Non drafts or other users drafts are not overwritten. The autosave is stored in a special post revision for each user.
		return wp_create_post_autosave( wp_slash( $post_data ) );
	}
}

/**
 * Redirect to previous page.
 *
 * @param int $post_id Optional. Post ID.
 */
function redirect_post( $post_id = '' ) {
	if ( isset( $_POST['save'] ) || isset( $_POST['publish'] ) ) {
		$status = get_post_status( $post_id );

		if ( isset( $_POST['publish'] ) ) {
			switch ( $status ) {
				case 'pending':
					$message = 8;
					break;
				case 'future':
					$message = 9;
					break;
				default:
					$message = 6;
			}
		} else {
			$message = 'draft' == $status ? 10 : 1;
		}

		$location = add_query_arg( 'message', $message, get_edit_post_link( $post_id, 'url' ) );
	} elseif ( isset( $_POST['addmeta'] ) && $_POST['addmeta'] ) {
		$location = add_query_arg( 'message', 2, wp_get_referer() );
		$location = explode( '#', $location );
		$location = $location[0] . '#postcustom';
	} elseif ( isset( $_POST['deletemeta'] ) && $_POST['deletemeta'] ) {
		$location = add_query_arg( 'message', 3, wp_get_referer() );
		$location = explode( '#', $location );
		$location = $location[0] . '#postcustom';
	} else {
		$location = add_query_arg( 'message', 4, get_edit_post_link( $post_id, 'url' ) );
	}

	/**
	 * Filters the post redirect destination URL.
	 *
	 * @since 2.9.0
	 *
	 * @param string $location The destination URL.
	 * @param int    $post_id  The post ID.
	 */
	wp_redirect( apply_filters( 'redirect_post_location', $location, $post_id ) );
	exit;
}

/**
 * Sanitizes POST values from a checkbox taxonomy metabox.
 *
 * @since 5.1.0
 *
 * @param mixed $terms Raw term data from the 'tax_input' field.
 * @return array
 */
function taxonomy_meta_box_sanitize_cb_checkboxes( $taxonomy, $terms ) {
	return array_map( 'intval', $terms );
}

/**
 * Sanitizes POST values from an input taxonomy metabox.
 *
 * @since 5.1.0
 *
 * @param mixed $terms Raw term data from the 'tax_input' field.
 * @return array
 */
function taxonomy_meta_box_sanitize_cb_input( $taxonomy, $terms ) {
	/*
	 * Assume that a 'tax_input' string is a comma-separated list of term names.
	 * Some languages may use a character other than a comma as a delimiter, so we standardize on
	 * commas before parsing the list.
	 */
	if ( ! is_array( $terms ) ) {
		$comma = _x( ',', 'tag delimiter' );
		if ( ',' !== $comma ) {
			$terms = str_replace( $comma, ',', $terms );
		}
		$terms = explode( ',', trim( $terms, " \n\t\r\0\x0B," ) );
	}

	$clean_terms = array();
	foreach ( $terms as $term ) {
		// Empty terms are invalid input.
		if ( empty( $term ) ) {
			continue;
		}

		$_term = get_terms(
			$taxonomy,
			array(
				'name'       => $term,
				'fields'     => 'ids',
				'hide_empty' => false,
			)
		);

		if ( ! empty( $_term ) ) {
			$clean_terms[] = intval( $_term[0] );
		} else {
			// No existing term was found, so pass the string. A new term will be created.
			$clean_terms[] = $term;
		}
	}

	return $clean_terms;
}

/**
 * Return whether the post can be edited in the block editor.
 *
 * @since 5.0.0
 *
 * @param int|WP_Post $post Post ID or WP_Post object.
 * @return bool Whether the post can be edited in the block editor.
 */
function use_block_editor_for_post( $post ) {
	$post = get_post( $post );

	if ( ! $post ) {
		return false;
	}

	// We're in the meta box loader, so don't use the block editor.
	if ( isset( $_GET['meta-box-loader'] ) ) {
		check_admin_referer( 'meta-box-loader', 'meta-box-loader-nonce' );
		return false;
	}

	// The posts page can't be edited in the block editor.
	if ( absint( get_option( 'page_for_posts' ) ) === $post->ID && empty( $post->post_content ) ) {
		return false;
	}

	$use_block_editor = use_block_editor_for_post_type( $post->post_type );

	/**
	 * Filter whether a post is able to be edited in the block editor.
	 *
	 * @since 5.0.0
	 *
	 * @param bool    $use_block_editor Whether the post can be edited or not.
	 * @param WP_Post $post             The post being checked.
	 */
	return apply_filters( 'use_block_editor_for_post', $use_block_editor, $post );
}

/**
 * Return whether a post type is compatible with the block editor.
 *
 * The block editor depends on the REST API, and if the post type is not shown in the
 * REST API, then it won't work with the block editor.
 *
 * @since 5.0.0
 *
 * @param string $post_type The post type.
 * @return bool Whether the post type can be edited with the block editor.
 */
function use_block_editor_for_post_type( $post_type ) {
	if ( ! post_type_exists( $post_type ) ) {
		return false;
	}

	if ( ! post_type_supports( $post_type, 'editor' ) ) {
		return false;
	}

	$post_type_object = get_post_type_object( $post_type );
	if ( $post_type_object && ! $post_type_object->show_in_rest ) {
		return false;
	}

	/**
	 * Filter whether a post is able to be edited in the block editor.
	 *
	 * @since 5.0.0
	 *
	 * @param bool   $use_block_editor  Whether the post type can be edited or not. Default true.
	 * @param string $post_type         The post type being checked.
	 */
	return apply_filters( 'use_block_editor_for_post_type', true, $post_type );
}

/**
 * Returns all the block categories that will be shown in the block editor.
 *
 * @since 5.0.0
 *
 * @param WP_Post $post Post object.
 * @return array Array of block categories.
 */
function get_block_categories( $post ) {
	$default_categories = array(
		array(
			'slug'  => 'common',
			'title' => __( 'Common Blocks' ),
			'icon'  => null,
		),
		array(
			'slug'  => 'formatting',
			'title' => __( 'Formatting' ),
			'icon'  => null,
		),
		array(
			'slug'  => 'layout',
			'title' => __( 'Layout Elements' ),
			'icon'  => null,
		),
		array(
			'slug'  => 'widgets',
			'title' => __( 'Widgets' ),
			'icon'  => null,
		),
		array(
			'slug'  => 'embed',
			'title' => __( 'Embeds' ),
			'icon'  => null,
		),
		array(
			'slug'  => 'reusable',
			'title' => __( 'Reusable Blocks' ),
			'icon'  => null,
		),
	);

	/**
	 * Filter the default array of block categories.
	 *
	 * @since 5.0.0
	 *
	 * @param array   $default_categories Array of block categories.
	 * @param WP_Post $post               Post being loaded.
	 */
	return apply_filters( 'block_categories', $default_categories, $post );
}

/**
 * Prepares server-registered blocks for the block editor.
 *
 * Returns an associative array of registered block data keyed by block name. Data includes properties
 * of a block relevant for client registration.
 *
 * @since 5.0.0
 *
 * @return array An associative array of registered block data.
 */
function get_block_editor_server_block_settings() {
	$block_registry = WP_Block_Type_Registry::get_instance();
	$blocks         = array();
	$keys_to_pick   = array( 'title', 'description', 'icon', 'category', 'keywords', 'supports', 'attributes' );

	foreach ( $block_registry->get_all_registered() as $block_name => $block_type ) {
		foreach ( $keys_to_pick as $key ) {
			if ( ! isset( $block_type->{ $key } ) ) {
				continue;
			}

			if ( ! isset( $blocks[ $block_name ] ) ) {
				$blocks[ $block_name ] = array();
			}

			$blocks[ $block_name ][ $key ] = $block_type->{ $key };
		}
	}

	return $blocks;
}

/**
 * Renders the meta boxes forms.
 *
 * @since 5.0.0
 */
function the_block_editor_meta_boxes() {
	global $post, $current_screen, $wp_meta_boxes;

	// Handle meta box state.
	$_original_meta_boxes = $wp_meta_boxes;

	/**
	 * Fires right before the meta boxes are rendered.
	 *
	 * This allows for the filtering of meta box data, that should already be
	 * present by this point. Do not use as a means of adding meta box data.
	 *
	 * @since 5.0.0
	 *
	 * @param array $wp_meta_boxes Global meta box state.
	 */
	$wp_meta_boxes = apply_filters( 'filter_block_editor_meta_boxes', $wp_meta_boxes );
	$locations     = array( 'side', 'normal', 'advanced' );
	$priorities    = array( 'high', 'sorted', 'core', 'default', 'low' );

	// Render meta boxes.
	?>
	<form class="metabox-base-form">
	<?php the_block_editor_meta_box_post_form_hidden_fields( $post ); ?>
	</form>
	<form id="toggle-custom-fields-form" method="post" action="<?php echo esc_attr( admin_url( 'post.php' ) ); ?>">
		<?php wp_nonce_field( 'toggle-custom-fields' ); ?>
		<input type="hidden" name="action" value="toggle-custom-fields" />
	</form>
	<?php foreach ( $locations as $location ) : ?>
		<form class="metabox-location-<?php echo esc_attr( $location ); ?>" onsubmit="return false;">
			<div id="poststuff" class="sidebar-open">
				<div id="postbox-container-2" class="postbox-container">
					<?php
					do_meta_boxes(
						$current_screen,
						$location,
						$post
					);
					?>
				</div>
			</div>
		</form>
	<?php endforeach; ?>
	<?php

	$meta_boxes_per_location = array();
	foreach ( $locations as $location ) {
		$meta_boxes_per_location[ $location ] = array();

		if ( ! isset( $wp_meta_boxes[ $current_screen->id ][ $location ] ) ) {
			continue;
		}

		foreach ( $priorities as $priority ) {
			if ( ! isset( $wp_meta_boxes[ $current_screen->id ][ $location ][ $priority ] ) ) {
				continue;
			}

			$meta_boxes = (array) $wp_meta_boxes[ $current_screen->id ][ $location ][ $priority ];
			foreach ( $meta_boxes as $meta_box ) {
				if ( false == $meta_box || ! $meta_box['title'] ) {
					continue;
				}

				// If a meta box is just here for back compat, don't show it in the block editor.
				if ( isset( $meta_box['args']['__back_compat_meta_box'] ) && $meta_box['args']['__back_compat_meta_box'] ) {
					continue;
				}

				$meta_boxes_per_location[ $location ][] = array(
					'id'    => $meta_box['id'],
					'title' => $meta_box['title'],
				);
			}
		}
	}

	/**
	 * Sadly we probably can not add this data directly into editor settings.
	 *
	 * Some meta boxes need admin_head to fire for meta box registry.
	 * admin_head fires after admin_enqueue_scripts, which is where we create our
	 * editor instance.
	 */
	$script = 'window._wpLoadBlockEditor.then( function() {
		wp.data.dispatch( \'core/edit-post\' ).setAvailableMetaBoxesPerLocation( ' . wp_json_encode( $meta_boxes_per_location ) . ' );
	} );';

	wp_add_inline_script( 'wp-edit-post', $script );

	/**
	 * When `wp-edit-post` is output in the `<head>`, the inline script needs to be manually printed. Otherwise,
	 * meta boxes will not display because inline scripts for `wp-edit-post` will not be printed again after this point.
	 */
	if ( wp_script_is( 'wp-edit-post', 'done' ) ) {
		printf( "<script type='text/javascript'>\n%s\n</script>\n", trim( $script ) );
	}

	/**
	 * If the 'postcustom' meta box is enabled, then we need to perform some
	 * extra initialization on it.
	 */
	$enable_custom_fields = (bool) get_user_meta( get_current_user_id(), 'enable_custom_fields', true );
	if ( $enable_custom_fields ) {
		$script = "( function( $ ) {
			if ( $('#postcustom').length ) {
				$( '#the-list' ).wpList( {
					addBefore: function( s ) {
						s.data += '&post_id=$post->ID';
						return s;
					},
					addAfter: function() {
						$('table#list-table').show();
					}
				});
			}
		} )( jQuery );";
		wp_enqueue_script( 'wp-lists' );
		wp_add_inline_script( 'wp-lists', $script );
	}

	// Reset meta box data.
	$wp_meta_boxes = $_original_meta_boxes;
}

/**
 * Renders the hidden form required for the meta boxes form.
 *
 * @since 5.0.0
 *
 * @param WP_Post $post Current post object.
 */
function the_block_editor_meta_box_post_form_hidden_fields( $post ) {
	$form_extra = '';
	if ( 'auto-draft' === $post->post_status ) {
		$form_extra .= "<input type='hidden' id='auto_draft' name='auto_draft' value='1' />";
	}
	$form_action  = 'editpost';
	$nonce_action = 'update-post_' . $post->ID;
	$form_extra  .= "<input type='hidden' id='post_ID' name='post_ID' value='" . esc_attr( $post->ID ) . "' />";
	$referer      = wp_get_referer();
	$current_user = wp_get_current_user();
	$user_id      = $current_user->ID;
	wp_nonce_field( $nonce_action );

	/*
	 * Some meta boxes hook into these actions to add hidden input fields in the classic post form. For backwards
	 * compatibility, we can capture the output from these actions, and extract the hidden input fields.
	 */
	ob_start();
	/** This filter is documented in wp-admin/edit-form-advanced.php */
	do_action( 'edit_form_after_title', $post );
	/** This filter is documented in wp-admin/edit-form-advanced.php */
	do_action( 'edit_form_advanced', $post );
	$classic_output = ob_get_clean();

	$classic_elements = wp_html_split( $classic_output );
	$hidden_inputs    = '';
	foreach ( $classic_elements as $element ) {
		if ( 0 !== strpos( $element, '<input ' ) ) {
			continue;
		}

		if ( preg_match( '/\stype=[\'"]hidden[\'"]\s/', $element ) ) {
			echo $element;
		}
	}
	?>
	<input type="hidden" id="user-id" name="user_ID" value="<?php echo (int) $user_id; ?>" />
	<input type="hidden" id="hiddenaction" name="action" value="<?php echo esc_attr( $form_action ); ?>" />
	<input type="hidden" id="originalaction" name="originalaction" value="<?php echo esc_attr( $form_action ); ?>" />
	<input type="hidden" id="post_type" name="post_type" value="<?php echo esc_attr( $post->post_type ); ?>" />
	<input type="hidden" id="original_post_status" name="original_post_status" value="<?php echo esc_attr( $post->post_status ); ?>" />
	<input type="hidden" id="referredby" name="referredby" value="<?php echo $referer ? esc_url( $referer ) : ''; ?>" />

	<?php
	if ( 'draft' !== get_post_status( $post ) ) {
		wp_original_referer_field( true, 'previous' );
	}
	echo $form_extra;
	wp_nonce_field( 'meta-box-order', 'meta-box-order-nonce', false );
	wp_nonce_field( 'closedpostboxes', 'closedpostboxesnonce', false );
	// Permalink title nonce.
	wp_nonce_field( 'samplepermalink', 'samplepermalinknonce', false );

	/**
	 * Add hidden input fields to the meta box save form.
	 *
	 * Hook into this action to print `<input type="hidden" ... />` fields, which will be POSTed back to
	 * the server when meta boxes are saved.
	 *
	 * @since 5.0.0
	 *
	 * @params WP_Post $post The post that is being edited.
	 */
	do_action( 'block_editor_meta_box_hidden_fields', $post );
}
home/xbodynamge/www/wp-includes/post.php000064400000673737151125251420014432 0ustar00<?php
/**
 * Core Post API
 *
 * @package WordPress
 * @subpackage Post
 */

//
// Post Type Registration
//

/**
 * Creates the initial post types when 'init' action is fired.
 *
 * See {@see 'init'}.
 *
 * @since 2.9.0
 */
function create_initial_post_types() {
	register_post_type( 'post', array(
		'labels' => array(
			'name_admin_bar' => _x( 'Post', 'add new from admin bar' ),
		),
		'public'  => true,
		'_builtin' => true, /* internal use only. don't use this when registering your own post type. */
		'_edit_link' => 'post.php?post=%d', /* internal use only. don't use this when registering your own post type. */
		'capability_type' => 'post',
		'map_meta_cap' => true,
		'menu_position' => 5,
		'hierarchical' => false,
		'rewrite' => false,
		'query_var' => false,
		'delete_with_user' => true,
		'supports' => array( 'title', 'editor', 'author', 'thumbnail', 'excerpt', 'trackbacks', 'custom-fields', 'comments', 'revisions', 'post-formats' ),
		'show_in_rest' => true,
		'rest_base' => 'posts',
		'rest_controller_class' => 'WP_REST_Posts_Controller',
	) );

	register_post_type( 'page', array(
		'labels' => array(
			'name_admin_bar' => _x( 'Page', 'add new from admin bar' ),
		),
		'public' => true,
		'publicly_queryable' => false,
		'_builtin' => true, /* internal use only. don't use this when registering your own post type. */
		'_edit_link' => 'post.php?post=%d', /* internal use only. don't use this when registering your own post type. */
		'capability_type' => 'page',
		'map_meta_cap' => true,
		'menu_position' => 20,
		'hierarchical' => true,
		'rewrite' => false,
		'query_var' => false,
		'delete_with_user' => true,
		'supports' => array( 'title', 'editor', 'author', 'thumbnail', 'page-attributes', 'custom-fields', 'comments', 'revisions' ),
		'show_in_rest' => true,
		'rest_base' => 'pages',
		'rest_controller_class' => 'WP_REST_Posts_Controller',
	) );

	register_post_type( 'attachment', array(
		'labels' => array(
			'name' => _x('Media', 'post type general name'),
			'name_admin_bar' => _x( 'Media', 'add new from admin bar' ),
			'add_new' => _x( 'Add New', 'add new media' ),
 			'edit_item' => __( 'Edit Media' ),
 			'view_item' => __( 'View Attachment Page' ),
			'attributes' => __( 'Attachment Attributes' ),
		),
		'public' => true,
		'show_ui' => true,
		'_builtin' => true, /* internal use only. don't use this when registering your own post type. */
		'_edit_link' => 'post.php?post=%d', /* internal use only. don't use this when registering your own post type. */
		'capability_type' => 'post',
		'capabilities' => array(
			'create_posts' => 'upload_files',
		),
		'map_meta_cap' => true,
		'hierarchical' => false,
		'rewrite' => false,
		'query_var' => false,
		'show_in_nav_menus' => false,
		'delete_with_user' => true,
		'supports' => array( 'title', 'author', 'comments' ),
		'show_in_rest' => true,
		'rest_base' => 'media',
		'rest_controller_class' => 'WP_REST_Attachments_Controller',
	) );
	add_post_type_support( 'attachment:audio', 'thumbnail' );
	add_post_type_support( 'attachment:video', 'thumbnail' );

	register_post_type( 'revision', array(
		'labels' => array(
			'name' => __( 'Revisions' ),
			'singular_name' => __( 'Revision' ),
		),
		'public' => false,
		'_builtin' => true, /* internal use only. don't use this when registering your own post type. */
		'_edit_link' => 'revision.php?revision=%d', /* internal use only. don't use this when registering your own post type. */
		'capability_type' => 'post',
		'map_meta_cap' => true,
		'hierarchical' => false,
		'rewrite' => false,
		'query_var' => false,
		'can_export' => false,
		'delete_with_user' => true,
		'supports' => array( 'author' ),
	) );

	register_post_type( 'nav_menu_item', array(
		'labels' => array(
			'name' => __( 'Navigation Menu Items' ),
			'singular_name' => __( 'Navigation Menu Item' ),
		),
		'public' => false,
		'_builtin' => true, /* internal use only. don't use this when registering your own post type. */
		'hierarchical' => false,
		'rewrite' => false,
		'delete_with_user' => false,
		'query_var' => false,
	) );

	register_post_type( 'custom_css', array(
		'labels' => array(
			'name'          => __( 'Custom CSS' ),
			'singular_name' => __( 'Custom CSS' ),
		),
		'public'           => false,
		'hierarchical'     => false,
		'rewrite'          => false,
		'query_var'        => false,
		'delete_with_user' => false,
		'can_export'       => true,
		'_builtin'         => true, /* internal use only. don't use this when registering your own post type. */
		'supports'         => array( 'title', 'revisions' ),
		'capabilities'     => array(
			'delete_posts'           => 'edit_theme_options',
			'delete_post'            => 'edit_theme_options',
			'delete_published_posts' => 'edit_theme_options',
			'delete_private_posts'   => 'edit_theme_options',
			'delete_others_posts'    => 'edit_theme_options',
			'edit_post'              => 'edit_css',
			'edit_posts'             => 'edit_css',
			'edit_others_posts'      => 'edit_css',
			'edit_published_posts'   => 'edit_css',
			'read_post'              => 'read',
			'read_private_posts'     => 'read',
			'publish_posts'          => 'edit_theme_options',
		),
	) );

	register_post_type( 'customize_changeset', array(
		'labels' => array(
			'name'               => _x( 'Changesets', 'post type general name' ),
			'singular_name'      => _x( 'Changeset', 'post type singular name' ),
			'menu_name'          => _x( 'Changesets', 'admin menu' ),
			'name_admin_bar'     => _x( 'Changeset', 'add new on admin bar' ),
			'add_new'            => _x( 'Add New', 'Customize Changeset' ),
			'add_new_item'       => __( 'Add New Changeset' ),
			'new_item'           => __( 'New Changeset' ),
			'edit_item'          => __( 'Edit Changeset' ),
			'view_item'          => __( 'View Changeset' ),
			'all_items'          => __( 'All Changesets' ),
			'search_items'       => __( 'Search Changesets' ),
			'not_found'          => __( 'No changesets found.' ),
			'not_found_in_trash' => __( 'No changesets found in Trash.' ),
		),
		'public' => false,
		'_builtin' => true, /* internal use only. don't use this when registering your own post type. */
		'map_meta_cap' => true,
		'hierarchical' => false,
		'rewrite' => false,
		'query_var' => false,
		'can_export' => false,
		'delete_with_user' => false,
		'supports' => array( 'title', 'author' ),
		'capability_type' => 'customize_changeset',
		'capabilities' => array(
			'create_posts' => 'customize',
			'delete_others_posts' => 'customize',
			'delete_post' => 'customize',
			'delete_posts' => 'customize',
			'delete_private_posts' => 'customize',
			'delete_published_posts' => 'customize',
			'edit_others_posts' => 'customize',
			'edit_post' => 'customize',
			'edit_posts' => 'customize',
			'edit_private_posts' => 'customize',
			'edit_published_posts' => 'do_not_allow',
			'publish_posts' => 'customize',
			'read' => 'read',
			'read_post' => 'customize',
			'read_private_posts' => 'customize',
		),
	) );

	register_post_type( 'oembed_cache', array(
		'labels' => array(
			'name'          => __( 'oEmbed Responses' ),
			'singular_name' => __( 'oEmbed Response' ),
		),
		'public'           => false,
		'hierarchical'     => false,
		'rewrite'          => false,
		'query_var'        => false,
		'delete_with_user' => false,
		'can_export'       => false,
		'_builtin'         => true, /* internal use only. don't use this when registering your own post type. */
		'supports'         => array(),
	) );

	register_post_type( 'user_request', array(
		'labels'           => array(
			'name'          => __( 'User Requests' ),
			'singular_name' => __( 'User Request' ),
		),
		'public'           => false,
		'_builtin'         => true, /* internal use only. don't use this when registering your own post type. */
		'hierarchical'     => false,
		'rewrite'          => false,
		'query_var'        => false,
		'can_export'       => false,
		'delete_with_user' => false,
		'supports'         => array(),
	) );

	register_post_type(
		'wp_block',
		array(
			'labels'                => array(
				'name'                     => _x( 'Blocks', 'post type general name' ),
				'singular_name'            => _x( 'Block', 'post type singular name' ),
				'menu_name'                => _x( 'Blocks', 'admin menu' ),
				'name_admin_bar'           => _x( 'Block', 'add new on admin bar' ),
				'add_new'                  => _x( 'Add New', 'Block' ),
				'add_new_item'             => __( 'Add New Block' ),
				'new_item'                 => __( 'New Block' ),
				'edit_item'                => __( 'Edit Block' ),
				'view_item'                => __( 'View Block' ),
				'all_items'                => __( 'All Blocks' ),
				'search_items'             => __( 'Search Blocks' ),
				'not_found'                => __( 'No blocks found.' ),
				'not_found_in_trash'       => __( 'No blocks found in Trash.' ),
				'filter_items_list'        => __( 'Filter blocks list' ),
				'items_list_navigation'    => __( 'Blocks list navigation' ),
				'items_list'               => __( 'Blocks list' ),
				'item_published'           => __( 'Block published.' ),
				'item_published_privately' => __( 'Block published privately.' ),
				'item_reverted_to_draft'   => __( 'Block reverted to draft.' ),
				'item_scheduled'           => __( 'Block scheduled.' ),
				'item_updated'             => __( 'Block updated.' ),
			),
			'public'                => false,
			'_builtin'              => true, /* internal use only. don't use this when registering your own post type. */
			'show_ui'               => true,
			'show_in_menu'          => false,
			'rewrite'               => false,
			'show_in_rest'          => true,
			'rest_base'             => 'blocks',
			'rest_controller_class' => 'WP_REST_Blocks_Controller',
			'capability_type'       => 'block',
			'capabilities'          => array(
				// You need to be able to edit posts, in order to read blocks in their raw form.
				'read'                   => 'edit_posts',
				// You need to be able to publish posts, in order to create blocks.
				'create_posts'           => 'publish_posts',
				'edit_published_posts'   => 'edit_published_posts',
				'delete_published_posts' => 'delete_published_posts',
				'edit_others_posts'      => 'edit_others_posts',
				'delete_others_posts'    => 'delete_others_posts',
			),
			'map_meta_cap'          => true,
			'supports'              => array(
				'title',
				'editor',
			),
		)
	);


	register_post_status( 'publish', array(
		'label'       => _x( 'Published', 'post status' ),
		'public'      => true,
		'_builtin'    => true, /* internal use only. */
		'label_count' => _n_noop( 'Published <span class="count">(%s)</span>', 'Published <span class="count">(%s)</span>' ),
	) );

	register_post_status( 'future', array(
		'label'       => _x( 'Scheduled', 'post status' ),
		'protected'   => true,
		'_builtin'    => true, /* internal use only. */
		'label_count' => _n_noop('Scheduled <span class="count">(%s)</span>', 'Scheduled <span class="count">(%s)</span>' ),
	) );

	register_post_status( 'draft', array(
		'label'       => _x( 'Draft', 'post status' ),
		'protected'   => true,
		'_builtin'    => true, /* internal use only. */
		'label_count' => _n_noop( 'Draft <span class="count">(%s)</span>', 'Drafts <span class="count">(%s)</span>' ),
	) );

	register_post_status( 'pending', array(
		'label'       => _x( 'Pending', 'post status' ),
		'protected'   => true,
		'_builtin'    => true, /* internal use only. */
		'label_count' => _n_noop( 'Pending <span class="count">(%s)</span>', 'Pending <span class="count">(%s)</span>' ),
	) );

	register_post_status( 'private', array(
		'label'       => _x( 'Private', 'post status' ),
		'private'     => true,
		'_builtin'    => true, /* internal use only. */
		'label_count' => _n_noop( 'Private <span class="count">(%s)</span>', 'Private <span class="count">(%s)</span>' ),
	) );

	register_post_status( 'trash', array(
		'label'       => _x( 'Trash', 'post status' ),
		'internal'    => true,
		'_builtin'    => true, /* internal use only. */
		'label_count' => _n_noop( 'Trash <span class="count">(%s)</span>', 'Trash <span class="count">(%s)</span>' ),
		'show_in_admin_status_list' => true,
	) );

	register_post_status( 'auto-draft', array(
		'label'    => 'auto-draft',
		'internal' => true,
		'_builtin' => true, /* internal use only. */
	) );

	register_post_status( 'inherit', array(
		'label'    => 'inherit',
		'internal' => true,
		'_builtin' => true, /* internal use only. */
		'exclude_from_search' => false,
	) );

	register_post_status( 'request-pending', array(
		'label'               => _x( 'Pending', 'request status' ),
		'internal'            => true,
		'_builtin'            => true, /* internal use only. */
		'exclude_from_search' => false,
	) );

	register_post_status( 'request-confirmed', array(
		'label'               => _x( 'Confirmed', 'request status' ),
		'internal'            => true,
		'_builtin'            => true, /* internal use only. */
		'exclude_from_search' => false,
	) );

	register_post_status( 'request-failed', array(
		'label'               => _x( 'Failed', 'request status' ),
		'internal'            => true,
		'_builtin'            => true, /* internal use only. */
		'exclude_from_search' => false,
	) );

	register_post_status( 'request-completed', array(
		'label'               => _x( 'Completed', 'request status' ),
		'internal'            => true,
		'_builtin'            => true, /* internal use only. */
		'exclude_from_search' => false,
	) );
}

/**
 * Retrieve attached file path based on attachment ID.
 *
 * By default the path will go through the 'get_attached_file' filter, but
 * passing a true to the $unfiltered argument of get_attached_file() will
 * return the file path unfiltered.
 *
 * The function works by getting the single post meta name, named
 * '_wp_attached_file' and returning it. This is a convenience function to
 * prevent looking up the meta name and provide a mechanism for sending the
 * attached filename through a filter.
 *
 * @since 2.0.0
 *
 * @param int  $attachment_id Attachment ID.
 * @param bool $unfiltered    Optional. Whether to apply filters. Default false.
 * @return string|false The file path to where the attached file should be, false otherwise.
 */
function get_attached_file( $attachment_id, $unfiltered = false ) {
	$file = get_post_meta( $attachment_id, '_wp_attached_file', true );

	// If the file is relative, prepend upload dir.
	if ( $file && 0 !== strpos( $file, '/' ) && ! preg_match( '|^.:\\\|', $file ) && ( ( $uploads = wp_get_upload_dir() ) && false === $uploads['error'] ) ) {
		$file = $uploads['basedir'] . "/$file";
	}

	if ( $unfiltered ) {
		return $file;
	}

	/**
	 * Filters the attached file based on the given ID.
	 *
	 * @since 2.1.0
	 *
	 * @param string $file          Path to attached file.
	 * @param int    $attachment_id Attachment ID.
	 */
	return apply_filters( 'get_attached_file', $file, $attachment_id );
}

/**
 * Update attachment file path based on attachment ID.
 *
 * Used to update the file path of the attachment, which uses post meta name
 * '_wp_attached_file' to store the path of the attachment.
 *
 * @since 2.1.0
 *
 * @param int    $attachment_id Attachment ID.
 * @param string $file          File path for the attachment.
 * @return bool True on success, false on failure.
 */
function update_attached_file( $attachment_id, $file ) {
	if ( !get_post( $attachment_id ) )
		return false;

	/**
	 * Filters the path to the attached file to update.
	 *
	 * @since 2.1.0
	 *
	 * @param string $file          Path to the attached file to update.
	 * @param int    $attachment_id Attachment ID.
	 */
	$file = apply_filters( 'update_attached_file', $file, $attachment_id );

	if ( $file = _wp_relative_upload_path( $file ) )
		return update_post_meta( $attachment_id, '_wp_attached_file', $file );
	else
		return delete_post_meta( $attachment_id, '_wp_attached_file' );
}

/**
 * Return relative path to an uploaded file.
 *
 * The path is relative to the current upload dir.
 *
 * @since 2.9.0
 *
 * @param string $path Full path to the file.
 * @return string Relative path on success, unchanged path on failure.
 */
function _wp_relative_upload_path( $path ) {
	$new_path = $path;

	$uploads = wp_get_upload_dir();
	if ( 0 === strpos( $new_path, $uploads['basedir'] ) ) {
			$new_path = str_replace( $uploads['basedir'], '', $new_path );
			$new_path = ltrim( $new_path, '/' );
	}

	/**
	 * Filters the relative path to an uploaded file.
	 *
	 * @since 2.9.0
	 *
	 * @param string $new_path Relative path to the file.
	 * @param string $path     Full path to the file.
	 */
	return apply_filters( '_wp_relative_upload_path', $new_path, $path );
}

/**
 * Retrieve all children of the post parent ID.
 *
 * Normally, without any enhancements, the children would apply to pages. In the
 * context of the inner workings of WordPress, pages, posts, and attachments
 * share the same table, so therefore the functionality could apply to any one
 * of them. It is then noted that while this function does not work on posts, it
 * does not mean that it won't work on posts. It is recommended that you know
 * what context you wish to retrieve the children of.
 *
 * Attachments may also be made the child of a post, so if that is an accurate
 * statement (which needs to be verified), it would then be possible to get
 * all of the attachments for a post. Attachments have since changed since
 * version 2.5, so this is most likely inaccurate, but serves generally as an
 * example of what is possible.
 *
 * The arguments listed as defaults are for this function and also of the
 * get_posts() function. The arguments are combined with the get_children defaults
 * and are then passed to the get_posts() function, which accepts additional arguments.
 * You can replace the defaults in this function, listed below and the additional
 * arguments listed in the get_posts() function.
 *
 * The 'post_parent' is the most important argument and important attention
 * needs to be paid to the $args parameter. If you pass either an object or an
 * integer (number), then just the 'post_parent' is grabbed and everything else
 * is lost. If you don't specify any arguments, then it is assumed that you are
 * in The Loop and the post parent will be grabbed for from the current post.
 *
 * The 'post_parent' argument is the ID to get the children. The 'numberposts'
 * is the amount of posts to retrieve that has a default of '-1', which is
 * used to get all of the posts. Giving a number higher than 0 will only
 * retrieve that amount of posts.
 *
 * The 'post_type' and 'post_status' arguments can be used to choose what
 * criteria of posts to retrieve. The 'post_type' can be anything, but WordPress
 * post types are 'post', 'pages', and 'attachments'. The 'post_status'
 * argument will accept any post status within the write administration panels.
 *
 * @since 2.0.0
 *
 * @see get_posts()
 * @todo Check validity of description.
 *
 * @global WP_Post $post
 *
 * @param mixed  $args   Optional. User defined arguments for replacing the defaults. Default empty.
 * @param string $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
 *                       a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
 * @return array Array of children, where the type of each element is determined by $output parameter.
 *               Empty array on failure.
 */
function get_children( $args = '', $output = OBJECT ) {
	$kids = array();
	if ( empty( $args ) ) {
		if ( isset( $GLOBALS['post'] ) ) {
			$args = array('post_parent' => (int) $GLOBALS['post']->post_parent );
		} else {
			return $kids;
		}
	} elseif ( is_object( $args ) ) {
		$args = array('post_parent' => (int) $args->post_parent );
	} elseif ( is_numeric( $args ) ) {
		$args = array('post_parent' => (int) $args);
	}

	$defaults = array(
		'numberposts' => -1, 'post_type' => 'any',
		'post_status' => 'any', 'post_parent' => 0,
	);

	$r = wp_parse_args( $args, $defaults );

	$children = get_posts( $r );

	if ( ! $children )
		return $kids;

	if ( ! empty( $r['fields'] ) )
		return $children;

	update_post_cache($children);

	foreach ( $children as $key => $child )
		$kids[$child->ID] = $children[$key];

	if ( $output == OBJECT ) {
		return $kids;
	} elseif ( $output == ARRAY_A ) {
		$weeuns = array();
		foreach ( (array) $kids as $kid ) {
			$weeuns[$kid->ID] = get_object_vars($kids[$kid->ID]);
		}
		return $weeuns;
	} elseif ( $output == ARRAY_N ) {
		$babes = array();
		foreach ( (array) $kids as $kid ) {
			$babes[$kid->ID] = array_values(get_object_vars($kids[$kid->ID]));
		}
		return $babes;
	} else {
		return $kids;
	}
}

/**
 * Get extended entry info (<!--more-->).
 *
 * There should not be any space after the second dash and before the word
 * 'more'. There can be text or space(s) after the word 'more', but won't be
 * referenced.
 *
 * The returned array has 'main', 'extended', and 'more_text' keys. Main has the text before
 * the `<!--more-->`. The 'extended' key has the content after the
 * `<!--more-->` comment. The 'more_text' key has the custom "Read More" text.
 *
 * @since 1.0.0
 *
 * @param string $post Post content.
 * @return array Post before ('main'), after ('extended'), and custom read more ('more_text').
 */
function get_extended( $post ) {
	//Match the new style more links.
	if ( preg_match('/<!--more(.*?)?-->/', $post, $matches) ) {
		list($main, $extended) = explode($matches[0], $post, 2);
		$more_text = $matches[1];
	} else {
		$main = $post;
		$extended = '';
		$more_text = '';
	}

	//  leading and trailing whitespace.
	$main = preg_replace('/^[\s]*(.*)[\s]*$/', '\\1', $main);
	$extended = preg_replace('/^[\s]*(.*)[\s]*$/', '\\1', $extended);
	$more_text = preg_replace('/^[\s]*(.*)[\s]*$/', '\\1', $more_text);

	return array( 'main' => $main, 'extended' => $extended, 'more_text' => $more_text );
}

/**
 * Retrieves post data given a post ID or post object.
 *
 * See sanitize_post() for optional $filter values. Also, the parameter
 * `$post`, must be given as a variable, since it is passed by reference.
 *
 * @since 1.5.1
 *
 * @global WP_Post $post
 *
 * @param int|WP_Post|null $post   Optional. Post ID or post object. Defaults to global $post.
 * @param string           $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
 *                                 a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
 * @param string           $filter Optional. Type of filter to apply. Accepts 'raw', 'edit', 'db',
 *                                 or 'display'. Default 'raw'.
 * @return WP_Post|array|null Type corresponding to $output on success or null on failure.
 *                            When $output is OBJECT, a `WP_Post` instance is returned.
 */
function get_post( $post = null, $output = OBJECT, $filter = 'raw' ) {
	if ( empty( $post ) && isset( $GLOBALS['post'] ) )
		$post = $GLOBALS['post'];

	if ( $post instanceof WP_Post ) {
		$_post = $post;
	} elseif ( is_object( $post ) ) {
		if ( empty( $post->filter ) ) {
			$_post = sanitize_post( $post, 'raw' );
			$_post = new WP_Post( $_post );
		} elseif ( 'raw' == $post->filter ) {
			$_post = new WP_Post( $post );
		} else {
			$_post = WP_Post::get_instance( $post->ID );
		}
	} else {
		$_post = WP_Post::get_instance( $post );
	}

	if ( ! $_post )
		return null;

	$_post = $_post->filter( $filter );

	if ( $output == ARRAY_A )
		return $_post->to_array();
	elseif ( $output == ARRAY_N )
		return array_values( $_post->to_array() );

	return $_post;
}

/**
 * Retrieve ancestors of a post.
 *
 * @since 2.5.0
 *
 * @param int|WP_Post $post Post ID or post object.
 * @return array Ancestor IDs or empty array if none are found.
 */
function get_post_ancestors( $post ) {
	$post = get_post( $post );

	if ( ! $post || empty( $post->post_parent ) || $post->post_parent == $post->ID )
		return array();

	$ancestors = array();

	$id = $ancestors[] = $post->post_parent;

	while ( $ancestor = get_post( $id ) ) {
		// Loop detection: If the ancestor has been seen before, break.
		if ( empty( $ancestor->post_parent ) || ( $ancestor->post_parent == $post->ID ) || in_array( $ancestor->post_parent, $ancestors ) )
			break;

		$id = $ancestors[] = $ancestor->post_parent;
	}

	return $ancestors;
}

/**
 * Retrieve data from a post field based on Post ID.
 *
 * Examples of the post field will be, 'post_type', 'post_status', 'post_content',
 * etc and based off of the post object property or key names.
 *
 * The context values are based off of the taxonomy filter functions and
 * supported values are found within those functions.
 *
 * @since 2.3.0
 * @since 4.5.0 The `$post` parameter was made optional.
 *
 * @see sanitize_post_field()
 *
 * @param string      $field   Post field name.
 * @param int|WP_Post $post    Optional. Post ID or post object. Defaults to current post.
 * @param string      $context Optional. How to filter the field. Accepts 'raw', 'edit', 'db',
 *                             or 'display'. Default 'display'.
 * @return string The value of the post field on success, empty string on failure.
 */
function get_post_field( $field, $post = null, $context = 'display' ) {
	$post = get_post( $post );

	if ( !$post )
		return '';

	if ( !isset($post->$field) )
		return '';

	return sanitize_post_field($field, $post->$field, $post->ID, $context);
}

/**
 * Retrieve the mime type of an attachment based on the ID.
 *
 * This function can be used with any post type, but it makes more sense with
 * attachments.
 *
 * @since 2.0.0
 *
 * @param int|WP_Post $ID Optional. Post ID or post object. Default empty.
 * @return string|false The mime type on success, false on failure.
 */
function get_post_mime_type( $ID = '' ) {
	$post = get_post($ID);

	if ( is_object($post) )
		return $post->post_mime_type;

	return false;
}

/**
 * Retrieve the post status based on the Post ID.
 *
 * If the post ID is of an attachment, then the parent post status will be given
 * instead.
 *
 * @since 2.0.0
 *
 * @param int|WP_Post $ID Optional. Post ID or post object. Default empty.
 * @return string|false Post status on success, false on failure.
 */
function get_post_status( $ID = '' ) {
	$post = get_post($ID);

	if ( !is_object($post) )
		return false;

	if ( 'attachment' == $post->post_type ) {
		if ( 'private' == $post->post_status )
			return 'private';

		// Unattached attachments are assumed to be published.
		if ( ( 'inherit' == $post->post_status ) && ( 0 == $post->post_parent) )
			return 'publish';

		// Inherit status from the parent.
		if ( $post->post_parent && ( $post->ID != $post->post_parent ) ) {
			$parent_post_status = get_post_status( $post->post_parent );
			if ( 'trash' == $parent_post_status ) {
				return get_post_meta( $post->post_parent, '_wp_trash_meta_status', true );
			} else {
				return $parent_post_status;
			}
		}

	}

	/**
	 * Filters the post status.
	 *
	 * @since 4.4.0
	 *
	 * @param string  $post_status The post status.
	 * @param WP_Post $post        The post object.
	 */
	return apply_filters( 'get_post_status', $post->post_status, $post );
}

/**
 * Retrieve all of the WordPress supported post statuses.
 *
 * Posts have a limited set of valid status values, this provides the
 * post_status values and descriptions.
 *
 * @since 2.5.0
 *
 * @return array List of post statuses.
 */
function get_post_statuses() {
	$status = array(
		'draft'   => __( 'Draft' ),
		'pending' => __( 'Pending Review' ),
		'private' => __( 'Private' ),
		'publish' => __( 'Published' )
	);

	return $status;
}

/**
 * Retrieve all of the WordPress support page statuses.
 *
 * Pages have a limited set of valid status values, this provides the
 * post_status values and descriptions.
 *
 * @since 2.5.0
 *
 * @return array List of page statuses.
 */
function get_page_statuses() {
	$status = array(
		'draft'   => __( 'Draft' ),
		'private' => __( 'Private' ),
		'publish' => __( 'Published' )
	);

	return $status;
}

/**
 * Return statuses for privacy requests.
 *
 * @since 4.9.6
 *
 * @return array
 */
function _wp_privacy_statuses() {
	return array(
		'request-pending'   => __( 'Pending' ),      // Pending confirmation from user.
		'request-confirmed' => __( 'Confirmed' ),    // User has confirmed the action.
		'request-failed'    => __( 'Failed' ),       // User failed to confirm the action.
		'request-completed' => __( 'Completed' ),    // Admin has handled the request.
	);
}

/**
 * Register a post status. Do not use before init.
 *
 * A simple function for creating or modifying a post status based on the
 * parameters given. The function will accept an array (second optional
 * parameter), along with a string for the post status name.
 *
 * Arguments prefixed with an _underscore shouldn't be used by plugins and themes.
 *
 * @since 3.0.0
 * @global array $wp_post_statuses Inserts new post status object into the list
 *
 * @param string $post_status Name of the post status.
 * @param array|string $args {
 *     Optional. Array or string of post status arguments.
 *
 *     @type bool|string $label                     A descriptive name for the post status marked
 *                                                  for translation. Defaults to value of $post_status.
 *     @type bool|array  $label_count               Descriptive text to use for nooped plurals.
 *                                                  Default array of $label, twice
 *     @type bool        $exclude_from_search       Whether to exclude posts with this post status
 *                                                  from search results. Default is value of $internal.
 *     @type bool        $_builtin                  Whether the status is built-in. Core-use only.
 *                                                  Default false.
 *     @type bool        $public                    Whether posts of this status should be shown
 *                                                  in the front end of the site. Default false.
 *     @type bool        $internal                  Whether the status is for internal use only.
 *                                                  Default false.
 *     @type bool        $protected                 Whether posts with this status should be protected.
 *                                                  Default false.
 *     @type bool        $private                   Whether posts with this status should be private.
 *                                                  Default false.
 *     @type bool        $publicly_queryable        Whether posts with this status should be publicly-
 *                                                  queryable. Default is value of $public.
 *     @type bool        $show_in_admin_all_list    Whether to include posts in the edit listing for
 *                                                  their post type. Default is value of $internal.
 *     @type bool        $show_in_admin_status_list Show in the list of statuses with post counts at
 *                                                  the top of the edit listings,
 *                                                  e.g. All (12) | Published (9) | My Custom Status (2)
 *                                                  Default is value of $internal.
 * }
 * @return object
 */
function register_post_status( $post_status, $args = array() ) {
	global $wp_post_statuses;

	if (!is_array($wp_post_statuses))
		$wp_post_statuses = array();

	// Args prefixed with an underscore are reserved for internal use.
	$defaults = array(
		'label' => false,
		'label_count' => false,
		'exclude_from_search' => null,
		'_builtin' => false,
		'public' => null,
		'internal' => null,
		'protected' => null,
		'private' => null,
		'publicly_queryable' => null,
		'show_in_admin_status_list' => null,
		'show_in_admin_all_list' => null,
	);
	$args = wp_parse_args($args, $defaults);
	$args = (object) $args;

	$post_status = sanitize_key($post_status);
	$args->name = $post_status;

	// Set various defaults.
	if ( null === $args->public && null === $args->internal && null === $args->protected && null === $args->private )
		$args->internal = true;

	if ( null === $args->public  )
		$args->public = false;

	if ( null === $args->private  )
		$args->private = false;

	if ( null === $args->protected  )
		$args->protected = false;

	if ( null === $args->internal  )
		$args->internal = false;

	if ( null === $args->publicly_queryable )
		$args->publicly_queryable = $args->public;

	if ( null === $args->exclude_from_search )
		$args->exclude_from_search = $args->internal;

	if ( null === $args->show_in_admin_all_list )
		$args->show_in_admin_all_list = !$args->internal;

	if ( null === $args->show_in_admin_status_list )
		$args->show_in_admin_status_list = !$args->internal;

	if ( false === $args->label )
		$args->label = $post_status;

	if ( false === $args->label_count )
		$args->label_count = _n_noop( $args->label, $args->label );

	$wp_post_statuses[$post_status] = $args;

	return $args;
}

/**
 * Retrieve a post status object by name.
 *
 * @since 3.0.0
 *
 * @global array $wp_post_statuses List of post statuses.
 *
 * @see register_post_status()
 *
 * @param string $post_status The name of a registered post status.
 * @return object|null A post status object.
 */
function get_post_status_object( $post_status ) {
	global $wp_post_statuses;

	if ( empty($wp_post_statuses[$post_status]) )
		return null;

	return $wp_post_statuses[$post_status];
}

/**
 * Get a list of post statuses.
 *
 * @since 3.0.0
 *
 * @global array $wp_post_statuses List of post statuses.
 *
 * @see register_post_status()
 *
 * @param array|string $args     Optional. Array or string of post status arguments to compare against
 *                               properties of the global `$wp_post_statuses objects`. Default empty array.
 * @param string       $output   Optional. The type of output to return, either 'names' or 'objects'. Default 'names'.
 * @param string       $operator Optional. The logical operation to perform. 'or' means only one element
 *                               from the array needs to match; 'and' means all elements must match.
 *                               Default 'and'.
 * @return array A list of post status names or objects.
 */
function get_post_stati( $args = array(), $output = 'names', $operator = 'and' ) {
	global $wp_post_statuses;

	$field = ('names' == $output) ? 'name' : false;

	return wp_filter_object_list($wp_post_statuses, $args, $operator, $field);
}

/**
 * Whether the post type is hierarchical.
 *
 * A false return value might also mean that the post type does not exist.
 *
 * @since 3.0.0
 *
 * @see get_post_type_object()
 *
 * @param string $post_type Post type name
 * @return bool Whether post type is hierarchical.
 */
function is_post_type_hierarchical( $post_type ) {
	if ( ! post_type_exists( $post_type ) )
		return false;

	$post_type = get_post_type_object( $post_type );
	return $post_type->hierarchical;
}

/**
 * Determines whether a post type is registered.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 3.0.0
 *
 * @see get_post_type_object()
 *
 * @param string $post_type Post type name.
 * @return bool Whether post type is registered.
 */
function post_type_exists( $post_type ) {
	return (bool) get_post_type_object( $post_type );
}

/**
 * Retrieves the post type of the current post or of a given post.
 *
 * @since 2.1.0
 *
 * @param int|WP_Post|null $post Optional. Post ID or post object. Default is global $post.
 * @return string|false          Post type on success, false on failure.
 */
function get_post_type( $post = null ) {
	if ( $post = get_post( $post ) )
		return $post->post_type;

	return false;
}

/**
 * Retrieves a post type object by name.
 *
 * @since 3.0.0
 * @since 4.6.0 Object returned is now an instance of WP_Post_Type.
 *
 * @global array $wp_post_types List of post types.
 *
 * @see register_post_type()
 *
 * @param string $post_type The name of a registered post type.
 * @return WP_Post_Type|null WP_Post_Type object if it exists, null otherwise.
 */
function get_post_type_object( $post_type ) {
	global $wp_post_types;

	if ( ! is_scalar( $post_type ) || empty( $wp_post_types[ $post_type ] ) ) {
		return null;
	}

	return $wp_post_types[ $post_type ];
}

/**
 * Get a list of all registered post type objects.
 *
 * @since 2.9.0
 *
 * @global array $wp_post_types List of post types.
 *
 * @see register_post_type() for accepted arguments.
 *
 * @param array|string $args     Optional. An array of key => value arguments to match against
 *                               the post type objects. Default empty array.
 * @param string       $output   Optional. The type of output to return. Accepts post type 'names'
 *                               or 'objects'. Default 'names'.
 * @param string       $operator Optional. The logical operation to perform. 'or' means only one
 *                               element from the array needs to match; 'and' means all elements
 *                               must match; 'not' means no elements may match. Default 'and'.
 * @return array A list of post type names or objects.
 */
function get_post_types( $args = array(), $output = 'names', $operator = 'and' ) {
	global $wp_post_types;

	$field = ('names' == $output) ? 'name' : false;

	return wp_filter_object_list($wp_post_types, $args, $operator, $field);
}

/**
 * Registers a post type.
 *
 * Note: Post type registrations should not be hooked before the
 * {@see 'init'} action. Also, any taxonomy connections should be
 * registered via the `$taxonomies` argument to ensure consistency
 * when hooks such as {@see 'parse_query'} or {@see 'pre_get_posts'}
 * are used.
 *
 * Post types can support any number of built-in core features such
 * as meta boxes, custom fields, post thumbnails, post statuses,
 * comments, and more. See the `$supports` argument for a complete
 * list of supported features.
 *
 * @since 2.9.0
 * @since 3.0.0 The `show_ui` argument is now enforced on the new post screen.
 * @since 4.4.0 The `show_ui` argument is now enforced on the post type listing
 *              screen and post editing screen.
 * @since 4.6.0 Post type object returned is now an instance of WP_Post_Type.
 * @since 4.7.0 Introduced `show_in_rest`, 'rest_base' and 'rest_controller_class'
 *              arguments to register the post type in REST API.
 *
 * @global array $wp_post_types List of post types.
 *
 * @param string $post_type Post type key. Must not exceed 20 characters and may
 *                          only contain lowercase alphanumeric characters, dashes,
 *                          and underscores. See sanitize_key().
 * @param array|string $args {
 *     Array or string of arguments for registering a post type.
 *
 *     @type string      $label                 Name of the post type shown in the menu. Usually plural.
 *                                              Default is value of $labels['name'].
 *     @type array       $labels                An array of labels for this post type. If not set, post
 *                                              labels are inherited for non-hierarchical types and page
 *                                              labels for hierarchical ones. See get_post_type_labels() for a full
 *                                              list of supported labels.
 *     @type string      $description           A short descriptive summary of what the post type is.
 *                                              Default empty.
 *     @type bool        $public                Whether a post type is intended for use publicly either via
 *                                              the admin interface or by front-end users. While the default
 *                                              settings of $exclude_from_search, $publicly_queryable, $show_ui,
 *                                              and $show_in_nav_menus are inherited from public, each does not
 *                                              rely on this relationship and controls a very specific intention.
 *                                              Default false.
 *     @type bool        $hierarchical          Whether the post type is hierarchical (e.g. page). Default false.
 *     @type bool        $exclude_from_search   Whether to exclude posts with this post type from front end search
 *                                              results. Default is the opposite value of $public.
 *     @type bool        $publicly_queryable    Whether queries can be performed on the front end for the post type
 *                                              as part of parse_request(). Endpoints would include:
 *                                              * ?post_type={post_type_key}
 *                                              * ?{post_type_key}={single_post_slug}
 *                                              * ?{post_type_query_var}={single_post_slug}
 *                                              If not set, the default is inherited from $public.
 *     @type bool        $show_ui               Whether to generate and allow a UI for managing this post type in the
 *                                              admin. Default is value of $public.
 *     @type bool        $show_in_menu          Where to show the post type in the admin menu. To work, $show_ui
 *                                              must be true. If true, the post type is shown in its own top level
 *                                              menu. If false, no menu is shown. If a string of an existing top
 *                                              level menu (eg. 'tools.php' or 'edit.php?post_type=page'), the post
 *                                              type will be placed as a sub-menu of that.
 *                                              Default is value of $show_ui.
 *     @type bool        $show_in_nav_menus     Makes this post type available for selection in navigation menus.
 *                                              Default is value $public.
 *     @type bool        $show_in_admin_bar     Makes this post type available via the admin bar. Default is value
 *                                              of $show_in_menu.
 *     @type bool        $show_in_rest          Whether to add the post type route in the REST API 'wp/v2' namespace.
 *     @type string      $rest_base             To change the base url of REST API route. Default is $post_type.
 *     @type string      $rest_controller_class REST API Controller class name. Default is 'WP_REST_Posts_Controller'.
 *     @type int         $menu_position         The position in the menu order the post type should appear. To work,
 *                                              $show_in_menu must be true. Default null (at the bottom).
 *     @type string      $menu_icon             The url to the icon to be used for this menu. Pass a base64-encoded
 *                                              SVG using a data URI, which will be colored to match the color scheme
 *                                              -- this should begin with 'data:image/svg+xml;base64,'. Pass the name
 *                                              of a Dashicons helper class to use a font icon, e.g.
 *                                              'dashicons-chart-pie'. Pass 'none' to leave div.wp-menu-image empty
 *                                              so an icon can be added via CSS. Defaults to use the posts icon.
 *     @type string      $capability_type       The string to use to build the read, edit, and delete capabilities.
 *                                              May be passed as an array to allow for alternative plurals when using
 *                                              this argument as a base to construct the capabilities, e.g.
 *                                              array('story', 'stories'). Default 'post'.
 *     @type array       $capabilities          Array of capabilities for this post type. $capability_type is used
 *                                              as a base to construct capabilities by default.
 *                                              See get_post_type_capabilities().
 *     @type bool        $map_meta_cap          Whether to use the internal default meta capability handling.
 *                                              Default false.
 *     @type array       $supports              Core feature(s) the post type supports. Serves as an alias for calling
 *                                              add_post_type_support() directly. Core features include 'title',
 *                                              'editor', 'comments', 'revisions', 'trackbacks', 'author', 'excerpt',
 *                                              'page-attributes', 'thumbnail', 'custom-fields', and 'post-formats'.
 *                                              Additionally, the 'revisions' feature dictates whether the post type
 *                                              will store revisions, and the 'comments' feature dictates whether the
 *                                              comments count will show on the edit screen. Defaults is an array
 *                                              containing 'title' and 'editor'.
 *     @type callable    $register_meta_box_cb  Provide a callback function that sets up the meta boxes for the
 *                                              edit form. Do remove_meta_box() and add_meta_box() calls in the
 *                                              callback. Default null.
 *     @type array       $taxonomies            An array of taxonomy identifiers that will be registered for the
 *                                              post type. Taxonomies can be registered later with register_taxonomy()
 *                                              or register_taxonomy_for_object_type().
 *                                              Default empty array.
 *     @type bool|string $has_archive           Whether there should be post type archives, or if a string, the
 *                                              archive slug to use. Will generate the proper rewrite rules if
 *                                              $rewrite is enabled. Default false.
 *     @type bool|array  $rewrite              {
 *         Triggers the handling of rewrites for this post type. To prevent rewrite, set to false.
 *         Defaults to true, using $post_type as slug. To specify rewrite rules, an array can be
 *         passed with any of these keys:
 *
 *         @type string $slug       Customize the permastruct slug. Defaults to $post_type key.
 *         @type bool   $with_front Whether the permastruct should be prepended with WP_Rewrite::$front.
 *                                  Default true.
 *         @type bool   $feeds      Whether the feed permastruct should be built for this post type.
 *                                  Default is value of $has_archive.
 *         @type bool   $pages      Whether the permastruct should provide for pagination. Default true.
 *         @type const  $ep_mask    Endpoint mask to assign. If not specified and permalink_epmask is set,
 *                                  inherits from $permalink_epmask. If not specified and permalink_epmask
 *                                  is not set, defaults to EP_PERMALINK.
 *     }
 *     @type string|bool $query_var             Sets the query_var key for this post type. Defaults to $post_type
 *                                              key. If false, a post type cannot be loaded at
 *                                              ?{query_var}={post_slug}. If specified as a string, the query
 *                                              ?{query_var_string}={post_slug} will be valid.
 *     @type bool        $can_export            Whether to allow this post type to be exported. Default true.
 *     @type bool        $delete_with_user      Whether to delete posts of this type when deleting a user. If true,
 *                                              posts of this type belonging to the user will be moved to trash
 *                                              when then user is deleted. If false, posts of this type belonging
 *                                              to the user will *not* be trashed or deleted. If not set (the default),
 *                                              posts are trashed if post_type_supports('author'). Otherwise posts
 *                                              are not trashed or deleted. Default null.
 *     @type bool        $_builtin              FOR INTERNAL USE ONLY! True if this post type is a native or
 *                                              "built-in" post_type. Default false.
 *     @type string      $_edit_link            FOR INTERNAL USE ONLY! URL segment to use for edit link of
 *                                              this post type. Default 'post.php?post=%d'.
 * }
 * @return WP_Post_Type|WP_Error The registered post type object, or an error object.
 */
function register_post_type( $post_type, $args = array() ) {
	global $wp_post_types;

	if ( ! is_array( $wp_post_types ) ) {
		$wp_post_types = array();
	}

	// Sanitize post type name
	$post_type = sanitize_key( $post_type );

	if ( empty( $post_type ) || strlen( $post_type ) > 20 ) {
		_doing_it_wrong( __FUNCTION__, __( 'Post type names must be between 1 and 20 characters in length.' ), '4.2.0' );
		return new WP_Error( 'post_type_length_invalid', __( 'Post type names must be between 1 and 20 characters in length.' ) );
	}

	$post_type_object = new WP_Post_Type( $post_type, $args );
	$post_type_object->add_supports();
	$post_type_object->add_rewrite_rules();
	$post_type_object->register_meta_boxes();

	$wp_post_types[ $post_type ] = $post_type_object;

	$post_type_object->add_hooks();
	$post_type_object->register_taxonomies();

	/**
	 * Fires after a post type is registered.
	 *
	 * @since 3.3.0
	 * @since 4.6.0 Converted the `$post_type` parameter to accept a WP_Post_Type object.
	 *
	 * @param string       $post_type        Post type.
	 * @param WP_Post_Type $post_type_object Arguments used to register the post type.
	 */
	do_action( 'registered_post_type', $post_type, $post_type_object );

	return $post_type_object;
}

/**
 * Unregisters a post type.
 *
 * Can not be used to unregister built-in post types.
 *
 * @since 4.5.0
 *
 * @global array $wp_post_types List of post types.
 *
 * @param string $post_type Post type to unregister.
 * @return bool|WP_Error True on success, WP_Error on failure or if the post type doesn't exist.
 */
function unregister_post_type( $post_type ) {
	global $wp_post_types;

	if ( ! post_type_exists( $post_type ) ) {
		return new WP_Error( 'invalid_post_type', __( 'Invalid post type.' ) );
	}

	$post_type_object = get_post_type_object( $post_type );

	// Do not allow unregistering internal post types.
	if ( $post_type_object->_builtin ) {
		return new WP_Error( 'invalid_post_type', __( 'Unregistering a built-in post type is not allowed' ) );
	}

	$post_type_object->remove_supports();
	$post_type_object->remove_rewrite_rules();
	$post_type_object->unregister_meta_boxes();
	$post_type_object->remove_hooks();
	$post_type_object->unregister_taxonomies();

	unset( $wp_post_types[ $post_type ] );

	/**
	 * Fires after a post type was unregistered.
	 *
	 * @since 4.5.0
	 *
	 * @param string $post_type Post type key.
	 */
	do_action( 'unregistered_post_type', $post_type );

	return true;
}

/**
 * Build an object with all post type capabilities out of a post type object
 *
 * Post type capabilities use the 'capability_type' argument as a base, if the
 * capability is not set in the 'capabilities' argument array or if the
 * 'capabilities' argument is not supplied.
 *
 * The capability_type argument can optionally be registered as an array, with
 * the first value being singular and the second plural, e.g. array('story, 'stories')
 * Otherwise, an 's' will be added to the value for the plural form. After
 * registration, capability_type will always be a string of the singular value.
 *
 * By default, seven keys are accepted as part of the capabilities array:
 *
 * - edit_post, read_post, and delete_post are meta capabilities, which are then
 *   generally mapped to corresponding primitive capabilities depending on the
 *   context, which would be the post being edited/read/deleted and the user or
 *   role being checked. Thus these capabilities would generally not be granted
 *   directly to users or roles.
 *
 * - edit_posts - Controls whether objects of this post type can be edited.
 * - edit_others_posts - Controls whether objects of this type owned by other users
 *   can be edited. If the post type does not support an author, then this will
 *   behave like edit_posts.
 * - publish_posts - Controls publishing objects of this post type.
 * - read_private_posts - Controls whether private objects can be read.
 *
 * These four primitive capabilities are checked in core in various locations.
 * There are also seven other primitive capabilities which are not referenced
 * directly in core, except in map_meta_cap(), which takes the three aforementioned
 * meta capabilities and translates them into one or more primitive capabilities
 * that must then be checked against the user or role, depending on the context.
 *
 * - read - Controls whether objects of this post type can be read.
 * - delete_posts - Controls whether objects of this post type can be deleted.
 * - delete_private_posts - Controls whether private objects can be deleted.
 * - delete_published_posts - Controls whether published objects can be deleted.
 * - delete_others_posts - Controls whether objects owned by other users can be
 *   can be deleted. If the post type does not support an author, then this will
 *   behave like delete_posts.
 * - edit_private_posts - Controls whether private objects can be edited.
 * - edit_published_posts - Controls whether published objects can be edited.
 *
 * These additional capabilities are only used in map_meta_cap(). Thus, they are
 * only assigned by default if the post type is registered with the 'map_meta_cap'
 * argument set to true (default is false).
 *
 * @since 3.0.0
 *
 * @see register_post_type()
 * @see map_meta_cap()
 *
 * @param object $args Post type registration arguments.
 * @return object Object with all the capabilities as member variables.
 */
function get_post_type_capabilities( $args ) {
	if ( ! is_array( $args->capability_type ) )
		$args->capability_type = array( $args->capability_type, $args->capability_type . 's' );

	// Singular base for meta capabilities, plural base for primitive capabilities.
	list( $singular_base, $plural_base ) = $args->capability_type;

	$default_capabilities = array(
		// Meta capabilities
		'edit_post'          => 'edit_'         . $singular_base,
		'read_post'          => 'read_'         . $singular_base,
		'delete_post'        => 'delete_'       . $singular_base,
		// Primitive capabilities used outside of map_meta_cap():
		'edit_posts'         => 'edit_'         . $plural_base,
		'edit_others_posts'  => 'edit_others_'  . $plural_base,
		'publish_posts'      => 'publish_'      . $plural_base,
		'read_private_posts' => 'read_private_' . $plural_base,
	);

	// Primitive capabilities used within map_meta_cap():
	if ( $args->map_meta_cap ) {
		$default_capabilities_for_mapping = array(
			'read'                   => 'read',
			'delete_posts'           => 'delete_'           . $plural_base,
			'delete_private_posts'   => 'delete_private_'   . $plural_base,
			'delete_published_posts' => 'delete_published_' . $plural_base,
			'delete_others_posts'    => 'delete_others_'    . $plural_base,
			'edit_private_posts'     => 'edit_private_'     . $plural_base,
			'edit_published_posts'   => 'edit_published_'   . $plural_base,
		);
		$default_capabilities = array_merge( $default_capabilities, $default_capabilities_for_mapping );
	}

	$capabilities = array_merge( $default_capabilities, $args->capabilities );

	// Post creation capability simply maps to edit_posts by default:
	if ( ! isset( $capabilities['create_posts'] ) )
		$capabilities['create_posts'] = $capabilities['edit_posts'];

	// Remember meta capabilities for future reference.
	if ( $args->map_meta_cap )
		_post_type_meta_capabilities( $capabilities );

	return (object) $capabilities;
}

/**
 * Store or return a list of post type meta caps for map_meta_cap().
 *
 * @since 3.1.0
 * @access private
 *
 * @global array $post_type_meta_caps Used to store meta capabilities.
 *
 * @param array $capabilities Post type meta capabilities.
 */
function _post_type_meta_capabilities( $capabilities = null ) {
	global $post_type_meta_caps;

	foreach ( $capabilities as $core => $custom ) {
		if ( in_array( $core, array( 'read_post', 'delete_post', 'edit_post' ) ) ) {
			$post_type_meta_caps[ $custom ] = $core;
		}
	}
}

/**
 * Builds an object with all post type labels out of a post type object.
 *
 * Accepted keys of the label array in the post type object:
 *
 * - `name` - General name for the post type, usually plural. The same and overridden
 *          by `$post_type_object->label`. Default is 'Posts' / 'Pages'.
 * - `singular_name` - Name for one object of this post type. Default is 'Post' / 'Page'.
 * - `add_new` - Default is 'Add New' for both hierarchical and non-hierarchical types.
 *             When internationalizing this string, please use a {@link https://codex.wordpress.org/I18n_for_WordPress_Developers#Disambiguation_by_context gettext context}
 *             matching your post type. Example: `_x( 'Add New', 'product', 'textdomain' );`.
 * - `add_new_item` - Label for adding a new singular item. Default is 'Add New Post' / 'Add New Page'.
 * - `edit_item` - Label for editing a singular item. Default is 'Edit Post' / 'Edit Page'.
 * - `new_item` - Label for the new item page title. Default is 'New Post' / 'New Page'.
 * - `view_item` - Label for viewing a singular item. Default is 'View Post' / 'View Page'.
 * - `view_items` - Label for viewing post type archives. Default is 'View Posts' / 'View Pages'.
 * - `search_items` - Label for searching plural items. Default is 'Search Posts' / 'Search Pages'.
 * - `not_found` - Label used when no items are found. Default is 'No posts found' / 'No pages found'.
 * - `not_found_in_trash` - Label used when no items are in the trash. Default is 'No posts found in Trash' /
 *                        'No pages found in Trash'.
 * - `parent_item_colon` - Label used to prefix parents of hierarchical items. Not used on non-hierarchical
 *                       post types. Default is 'Parent Page:'.
 * - `all_items` - Label to signify all items in a submenu link. Default is 'All Posts' / 'All Pages'.
 * - `archives` - Label for archives in nav menus. Default is 'Post Archives' / 'Page Archives'.
 * - `attributes` - Label for the attributes meta box. Default is 'Post Attributes' / 'Page Attributes'.
 * - `insert_into_item` - Label for the media frame button. Default is 'Insert into post' / 'Insert into page'.
 * - `uploaded_to_this_item` - Label for the media frame filter. Default is 'Uploaded to this post' /
 *                           'Uploaded to this page'.
 * - `featured_image` - Label for the Featured Image meta box title. Default is 'Featured Image'.
 * - `set_featured_image` - Label for setting the featured image. Default is 'Set featured image'.
 * - `remove_featured_image` - Label for removing the featured image. Default is 'Remove featured image'.
 * - `use_featured_image` - Label in the media frame for using a featured image. Default is 'Use as featured image'.
 * - `menu_name` - Label for the menu name. Default is the same as `name`.
 * - `filter_items_list` - Label for the table views hidden heading. Default is 'Filter posts list' /
 *                       'Filter pages list'.
 * - `items_list_navigation` - Label for the table pagination hidden heading. Default is 'Posts list navigation' /
 *                           'Pages list navigation'.
 * - `items_list` - Label for the table hidden heading. Default is 'Posts list' / 'Pages list'.
 * - `item_published` - Label used when an item is published. Default is 'Post published.' / 'Page published.'
 * - `item_published_privately` - Label used when an item is published with private visibility.
 *                              Default is 'Post published privately.' / 'Page published privately.'
 * - `item_reverted_to_draft` - Label used when an item is switched to a draft.
 *                            Default is 'Post reverted to draft.' / 'Page reverted to draft.'
 * - `item_scheduled` - Label used when an item is scheduled for publishing. Default is 'Post scheduled.' /
 *                    'Page scheduled.'
 * - `item_updated` - Label used when an item is updated. Default is 'Post updated.' / 'Page updated.'
 *
 * Above, the first default value is for non-hierarchical post types (like posts)
 * and the second one is for hierarchical post types (like pages).
 *
 * Note: To set labels used in post type admin notices, see the {@see 'post_updated_messages'} filter.
 *
 * @since 3.0.0
 * @since 4.3.0 Added the `featured_image`, `set_featured_image`, `remove_featured_image`,
 *              and `use_featured_image` labels.
 * @since 4.4.0 Added the `archives`, `insert_into_item`, `uploaded_to_this_item`, `filter_items_list`,
 *              `items_list_navigation`, and `items_list` labels.
 * @since 4.6.0 Converted the `$post_type` parameter to accept a WP_Post_Type object.
 * @since 4.7.0 Added the `view_items` and `attributes` labels.
 * @since 5.0.0 Added the `item_published`, `item_published_privately`, `item_reverted_to_draft`,
 *              `item_scheduled`, and `item_updated` labels.
 *
 * @access private
 *
 * @param object|WP_Post_Type $post_type_object Post type object.
 * @return object Object with all the labels as member variables.
 */
function get_post_type_labels( $post_type_object ) {
	$nohier_vs_hier_defaults = array(
		'name' => array( _x('Posts', 'post type general name'), _x('Pages', 'post type general name') ),
		'singular_name' => array( _x('Post', 'post type singular name'), _x('Page', 'post type singular name') ),
		'add_new' => array( _x('Add New', 'post'), _x('Add New', 'page') ),
		'add_new_item' => array( __('Add New Post'), __('Add New Page') ),
		'edit_item' => array( __('Edit Post'), __('Edit Page') ),
		'new_item' => array( __('New Post'), __('New Page') ),
		'view_item' => array( __('View Post'), __('View Page') ),
		'view_items' => array( __('View Posts'), __('View Pages') ),
		'search_items' => array( __('Search Posts'), __('Search Pages') ),
		'not_found' => array( __('No posts found.'), __('No pages found.') ),
		'not_found_in_trash' => array( __('No posts found in Trash.'), __('No pages found in Trash.') ),
		'parent_item_colon' => array( null, __('Parent Page:') ),
		'all_items' => array( __( 'All Posts' ), __( 'All Pages' ) ),
		'archives' => array( __( 'Post Archives' ), __( 'Page Archives' ) ),
		'attributes' => array( __( 'Post Attributes' ), __( 'Page Attributes' ) ),
		'insert_into_item' => array( __( 'Insert into post' ), __( 'Insert into page' ) ),
		'uploaded_to_this_item' => array( __( 'Uploaded to this post' ), __( 'Uploaded to this page' ) ),
		'featured_image' => array( _x( 'Featured Image', 'post' ), _x( 'Featured Image', 'page' ) ),
		'set_featured_image' => array( _x( 'Set featured image', 'post' ), _x( 'Set featured image', 'page' ) ),
		'remove_featured_image' => array( _x( 'Remove featured image', 'post' ), _x( 'Remove featured image', 'page' ) ),
		'use_featured_image' => array( _x( 'Use as featured image', 'post' ), _x( 'Use as featured image', 'page' ) ),
		'filter_items_list' => array( __( 'Filter posts list' ), __( 'Filter pages list' ) ),
		'items_list_navigation' => array( __( 'Posts list navigation' ), __( 'Pages list navigation' ) ),
		'items_list' => array( __( 'Posts list' ), __( 'Pages list' ) ),
		'item_published' => array( __( 'Post published.' ), __( 'Page published.' ) ),
		'item_published_privately' => array( __( 'Post published privately.' ), __( 'Page published privately.' ) ),
		'item_reverted_to_draft' => array( __( 'Post reverted to draft.' ), __( 'Page reverted to draft.' ) ),
		'item_scheduled' => array( __( 'Post scheduled.' ), __( 'Page scheduled.' ) ),
		'item_updated' => array( __( 'Post updated.' ), __( 'Page updated.' ) ),
	);
	$nohier_vs_hier_defaults['menu_name'] = $nohier_vs_hier_defaults['name'];

	$labels = _get_custom_object_labels( $post_type_object, $nohier_vs_hier_defaults );

	$post_type = $post_type_object->name;

	$default_labels = clone $labels;

	/**
	 * Filters the labels of a specific post type.
	 *
	 * The dynamic portion of the hook name, `$post_type`, refers to
	 * the post type slug.
	 *
	 * @since 3.5.0
	 *
	 * @see get_post_type_labels() for the full list of labels.
	 *
	 * @param object $labels Object with labels for the post type as member variables.
	 */
	$labels = apply_filters( "post_type_labels_{$post_type}", $labels );

	// Ensure that the filtered labels contain all required default values.
	$labels = (object) array_merge( (array) $default_labels, (array) $labels );

	return $labels;
}

/**
 * Build an object with custom-something object (post type, taxonomy) labels
 * out of a custom-something object
 *
 * @since 3.0.0
 * @access private
 *
 * @param object $object                  A custom-something object.
 * @param array  $nohier_vs_hier_defaults Hierarchical vs non-hierarchical default labels.
 * @return object Object containing labels for the given custom-something object.
 */
function _get_custom_object_labels( $object, $nohier_vs_hier_defaults ) {
	$object->labels = (array) $object->labels;

	if ( isset( $object->label ) && empty( $object->labels['name'] ) )
		$object->labels['name'] = $object->label;

	if ( !isset( $object->labels['singular_name'] ) && isset( $object->labels['name'] ) )
		$object->labels['singular_name'] = $object->labels['name'];

	if ( ! isset( $object->labels['name_admin_bar'] ) )
		$object->labels['name_admin_bar'] = isset( $object->labels['singular_name'] ) ? $object->labels['singular_name'] : $object->name;

	if ( !isset( $object->labels['menu_name'] ) && isset( $object->labels['name'] ) )
		$object->labels['menu_name'] = $object->labels['name'];

	if ( !isset( $object->labels['all_items'] ) && isset( $object->labels['menu_name'] ) )
		$object->labels['all_items'] = $object->labels['menu_name'];

	if ( !isset( $object->labels['archives'] ) && isset( $object->labels['all_items'] ) ) {
		$object->labels['archives'] = $object->labels['all_items'];
	}

	$defaults = array();
	foreach ( $nohier_vs_hier_defaults as $key => $value ) {
		$defaults[$key] = $object->hierarchical ? $value[1] : $value[0];
	}
	$labels = array_merge( $defaults, $object->labels );
	$object->labels = (object) $object->labels;

	return (object) $labels;
}

/**
 * Add submenus for post types.
 *
 * @access private
 * @since 3.1.0
 */
function _add_post_type_submenus() {
	foreach ( get_post_types( array( 'show_ui' => true ) ) as $ptype ) {
		$ptype_obj = get_post_type_object( $ptype );
		// Sub-menus only.
		if ( ! $ptype_obj->show_in_menu || $ptype_obj->show_in_menu === true )
			continue;
		add_submenu_page( $ptype_obj->show_in_menu, $ptype_obj->labels->name, $ptype_obj->labels->all_items, $ptype_obj->cap->edit_posts, "edit.php?post_type=$ptype" );
	}
}

/**
 * Register support of certain features for a post type.
 *
 * All core features are directly associated with a functional area of the edit
 * screen, such as the editor or a meta box. Features include: 'title', 'editor',
 * 'comments', 'revisions', 'trackbacks', 'author', 'excerpt', 'page-attributes',
 * 'thumbnail', 'custom-fields', and 'post-formats'.
 *
 * Additionally, the 'revisions' feature dictates whether the post type will
 * store revisions, and the 'comments' feature dictates whether the comments
 * count will show on the edit screen.
 *
 * @since 3.0.0
 *
 * @global array $_wp_post_type_features
 *
 * @param string       $post_type The post type for which to add the feature.
 * @param string|array $feature   The feature being added, accepts an array of
 *                                feature strings or a single string.
 */
function add_post_type_support( $post_type, $feature ) {
	global $_wp_post_type_features;

	$features = (array) $feature;
	foreach ($features as $feature) {
		if ( func_num_args() == 2 )
			$_wp_post_type_features[$post_type][$feature] = true;
		else
			$_wp_post_type_features[$post_type][$feature] = array_slice( func_get_args(), 2 );
	}
}

/**
 * Remove support for a feature from a post type.
 *
 * @since 3.0.0
 *
 * @global array $_wp_post_type_features
 *
 * @param string $post_type The post type for which to remove the feature.
 * @param string $feature   The feature being removed.
 */
function remove_post_type_support( $post_type, $feature ) {
	global $_wp_post_type_features;

	unset( $_wp_post_type_features[ $post_type ][ $feature ] );
}

/**
 * Get all the post type features
 *
 * @since 3.4.0
 *
 * @global array $_wp_post_type_features
 *
 * @param string $post_type The post type.
 * @return array Post type supports list.
 */
function get_all_post_type_supports( $post_type ) {
	global $_wp_post_type_features;

	if ( isset( $_wp_post_type_features[$post_type] ) )
		return $_wp_post_type_features[$post_type];

	return array();
}

/**
 * Check a post type's support for a given feature.
 *
 * @since 3.0.0
 *
 * @global array $_wp_post_type_features
 *
 * @param string $post_type The post type being checked.
 * @param string $feature   The feature being checked.
 * @return bool Whether the post type supports the given feature.
 */
function post_type_supports( $post_type, $feature ) {
	global $_wp_post_type_features;

	return ( isset( $_wp_post_type_features[$post_type][$feature] ) );
}

/**
 * Retrieves a list of post type names that support a specific feature.
 *
 * @since 4.5.0
 *
 * @global array $_wp_post_type_features Post type features
 *
 * @param array|string $feature  Single feature or an array of features the post types should support.
 * @param string       $operator Optional. The logical operation to perform. 'or' means
 *                               only one element from the array needs to match; 'and'
 *                               means all elements must match; 'not' means no elements may
 *                               match. Default 'and'.
 * @return array A list of post type names.
 */
function get_post_types_by_support( $feature, $operator = 'and' ) {
	global $_wp_post_type_features;

	$features = array_fill_keys( (array) $feature, true );

	return array_keys( wp_filter_object_list( $_wp_post_type_features, $features, $operator ) );
}

/**
 * Update the post type for the post ID.
 *
 * The page or post cache will be cleaned for the post ID.
 *
 * @since 2.5.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int    $post_id   Optional. Post ID to change post type. Default 0.
 * @param string $post_type Optional. Post type. Accepts 'post' or 'page' to
 *                          name a few. Default 'post'.
 * @return int|false Amount of rows changed. Should be 1 for success and 0 for failure.
 */
function set_post_type( $post_id = 0, $post_type = 'post' ) {
	global $wpdb;

	$post_type = sanitize_post_field('post_type', $post_type, $post_id, 'db');
	$return = $wpdb->update( $wpdb->posts, array('post_type' => $post_type), array('ID' => $post_id) );

	clean_post_cache( $post_id );

	return $return;
}

/**
 * Determines whether a post type is considered "viewable".
 *
 * For built-in post types such as posts and pages, the 'public' value will be evaluated.
 * For all others, the 'publicly_queryable' value will be used.
 *
 * @since 4.4.0
 * @since 4.5.0 Added the ability to pass a post type name in addition to object.
 * @since 4.6.0 Converted the `$post_type` parameter to accept a WP_Post_Type object.
 *
 * @param string|WP_Post_Type $post_type Post type name or object.
 * @return bool Whether the post type should be considered viewable.
 */
function is_post_type_viewable( $post_type ) {
	if ( is_scalar( $post_type ) ) {
		$post_type = get_post_type_object( $post_type );
		if ( ! $post_type ) {
			return false;
		}
	}

	if ( ! is_object( $post_type ) ) {
		return false;
	}

	$is_viewable = $post_type->publicly_queryable || ( $post_type->_builtin && $post_type->public );

	/**
	 * Filters whether a post type is considered "viewable".
	 *
	 * The returned filtered value must be a boolean type to ensure
	 * `is_post_type_viewable()` only returns a boolean. This strictness
	 * is by design to maintain backwards-compatibility and guard against
	 * potential type errors in PHP 8.1+. Non-boolean values (even falsey
	 * and truthy values) will result in the function returning false.
	 *
	 * @since 5.9.0
	 *
	 * @param bool         $is_viewable Whether the post type is "viewable" (strict type).
	 * @param WP_Post_Type $post_type   Post type object.
	 */
	return true === apply_filters( 'is_post_type_viewable', $is_viewable, $post_type );
}

/**
 * Determines whether a post status is considered "viewable".
 *
 * For built-in post statuses such as publish and private, the 'public' value will be evaluated.
 * For all others, the 'publicly_queryable' value will be used.
 *
 * @since 5.7.0
 * @since 5.9.0 Added `is_post_status_viewable` hook to filter the result.
 *
 * @param string|stdClass $post_status Post status name or object.
 * @return bool Whether the post status should be considered viewable.
 */
function is_post_status_viewable( $post_status ) {
	if ( is_scalar( $post_status ) ) {
		$post_status = get_post_status_object( $post_status );

		if ( ! $post_status ) {
			return false;
		}
	}

	if (
		! is_object( $post_status ) ||
		$post_status->internal ||
		$post_status->protected
	) {
		return false;
	}

	$is_viewable = $post_status->publicly_queryable || ( $post_status->_builtin && $post_status->public );

	/**
	 * Filters whether a post status is considered "viewable".
	 *
	 * The returned filtered value must be a boolean type to ensure
	 * `is_post_status_viewable()` only returns a boolean. This strictness
	 * is by design to maintain backwards-compatibility and guard against
	 * potential type errors in PHP 8.1+. Non-boolean values (even falsey
	 * and truthy values) will result in the function returning false.
	 *
	 * @since 5.9.0
	 *
	 * @param bool     $is_viewable Whether the post status is "viewable" (strict type).
	 * @param stdClass $post_status Post status object.
	 */
	return true === apply_filters( 'is_post_status_viewable', $is_viewable, $post_status );
}

/**
 * Determines whether a post is publicly viewable.
 *
 * Posts are considered publicly viewable if both the post status and post type
 * are viewable.
 *
 * @since 5.7.0
 *
 * @param int|WP_Post|null $post Optional. Post ID or post object. Defaults to global $post.
 * @return bool Whether the post is publicly viewable.
 */
function is_post_publicly_viewable( $post = null ) {
	$post = get_post( $post );

	if ( ! $post ) {
		return false;
	}

	$post_type   = get_post_type( $post );
	$post_status = get_post_status( $post );

	return is_post_type_viewable( $post_type ) && is_post_status_viewable( $post_status );
}

/**
 * Retrieve list of latest posts or posts matching criteria.
 *
 * The defaults are as follows:
 *
 * @since 1.2.0
 *
 * @see WP_Query::parse_query()
 *
 * @param array $args {
 *     Optional. Arguments to retrieve posts. See WP_Query::parse_query() for all
 *     available arguments.
 *
 *     @type int        $numberposts      Total number of posts to retrieve. Is an alias of $posts_per_page
 *                                        in WP_Query. Accepts -1 for all. Default 5.
 *     @type int|string $category         Category ID or comma-separated list of IDs (this or any children).
 *                                        Is an alias of $cat in WP_Query. Default 0.
 *     @type array      $include          An array of post IDs to retrieve, sticky posts will be included.
 *                                        Is an alias of $post__in in WP_Query. Default empty array.
 *     @type array      $exclude          An array of post IDs not to retrieve. Default empty array.
 *     @type bool       $suppress_filters Whether to suppress filters. Default true.
 * }
 * @return array List of posts.
 */
function get_posts( $args = null ) {
	$defaults = array(
		'numberposts' => 5,
		'category' => 0, 'orderby' => 'date',
		'order' => 'DESC', 'include' => array(),
		'exclude' => array(), 'meta_key' => '',
		'meta_value' =>'', 'post_type' => 'post',
		'suppress_filters' => true
	);

	$r = wp_parse_args( $args, $defaults );
	if ( empty( $r['post_status'] ) )
		$r['post_status'] = ( 'attachment' == $r['post_type'] ) ? 'inherit' : 'publish';
	if ( ! empty($r['numberposts']) && empty($r['posts_per_page']) )
		$r['posts_per_page'] = $r['numberposts'];
	if ( ! empty($r['category']) )
		$r['cat'] = $r['category'];
	if ( ! empty($r['include']) ) {
		$incposts = wp_parse_id_list( $r['include'] );
		$r['posts_per_page'] = count($incposts);  // only the number of posts included
		$r['post__in'] = $incposts;
	} elseif ( ! empty($r['exclude']) )
		$r['post__not_in'] = wp_parse_id_list( $r['exclude'] );

	$r['ignore_sticky_posts'] = true;
	$r['no_found_rows'] = true;

	$get_posts = new WP_Query;
	return $get_posts->query($r);

}

//
// Post meta functions
//

/**
 * Add meta data field to a post.
 *
 * Post meta data is called "Custom Fields" on the Administration Screen.
 *
 * @since 1.5.0
 *
 * @param int    $post_id    Post ID.
 * @param string $meta_key   Metadata name.
 * @param mixed  $meta_value Metadata value. Must be serializable if non-scalar.
 * @param bool   $unique     Optional. Whether the same key should not be added.
 *                           Default false.
 * @return int|false Meta ID on success, false on failure.
 */
function add_post_meta( $post_id, $meta_key, $meta_value, $unique = false ) {
	// Make sure meta is added to the post, not a revision.
	$the_post = wp_is_post_revision( $post_id );
	if ( $the_post ) {
		$post_id = $the_post;
	}

	return add_metadata( 'post', $post_id, $meta_key, $meta_value, $unique );
}

/**
 * Remove metadata matching criteria from a post.
 *
 * You can match based on the key, or key and value. Removing based on key and
 * value, will keep from removing duplicate metadata with the same key. It also
 * allows removing all metadata matching key, if needed.
 *
 * @since 1.5.0
 *
 * @param int    $post_id    Post ID.
 * @param string $meta_key   Metadata name.
 * @param mixed  $meta_value Optional. Metadata value. Must be serializable if
 *                           non-scalar. Default empty.
 * @return bool True on success, false on failure.
 */
function delete_post_meta( $post_id, $meta_key, $meta_value = '' ) {
	// Make sure meta is added to the post, not a revision.
	$the_post = wp_is_post_revision( $post_id );
	if ( $the_post ) {
		$post_id = $the_post;
	}

	return delete_metadata( 'post', $post_id, $meta_key, $meta_value );
}

/**
 * Retrieve post meta field for a post.
 *
 * @since 1.5.0
 *
 * @param int    $post_id Post ID.
 * @param string $key     Optional. The meta key to retrieve. By default, returns
 *                        data for all keys. Default empty.
 * @param bool   $single  Optional. Whether to return a single value. Default false.
 * @return mixed Will be an array if $single is false. Will be value of meta data
 *               field if $single is true.
 */
function get_post_meta( $post_id, $key = '', $single = false ) {
	return get_metadata('post', $post_id, $key, $single);
}

/**
 * Update post meta field based on post ID.
 *
 * Use the $prev_value parameter to differentiate between meta fields with the
 * same key and post ID.
 *
 * If the meta field for the post does not exist, it will be added.
 *
 * @since 1.5.0
 *
 * @param int    $post_id    Post ID.
 * @param string $meta_key   Metadata key.
 * @param mixed  $meta_value Metadata value. Must be serializable if non-scalar.
 * @param mixed  $prev_value Optional. Previous value to check before removing.
 *                           Default empty.
 * @return int|bool Meta ID if the key didn't exist, true on successful update,
 *                  false on failure.
 */
function update_post_meta( $post_id, $meta_key, $meta_value, $prev_value = '' ) {
	// Make sure meta is added to the post, not a revision.
	$the_post = wp_is_post_revision( $post_id );
	if ( $the_post ) {
		$post_id = $the_post;
	}

	return update_metadata( 'post', $post_id, $meta_key, $meta_value, $prev_value );
}

/**
 * Delete everything from post meta matching meta key.
 *
 * @since 2.3.0
 *
 * @param string $post_meta_key Key to search for when deleting.
 * @return bool Whether the post meta key was deleted from the database.
 */
function delete_post_meta_by_key( $post_meta_key ) {
	return delete_metadata( 'post', null, $post_meta_key, '', true );
}

/**
 * Registers a meta key for posts.
 *
 * @since 4.9.8
 *
 * @param string $post_type Post type to register a meta key for. Pass an empty string
 *                          to register the meta key across all existing post types.
 * @param string $meta_key  The meta key to register.
 * @param array  $args      Data used to describe the meta key when registered. See
 *                          {@see register_meta()} for a list of supported arguments.
 * @return bool True if the meta key was successfully registered, false if not.
 */
function register_post_meta( $post_type, $meta_key, array $args ) {
	$args['object_subtype'] = $post_type;

	return register_meta( 'post', $meta_key, $args );
}

/**
 * Unregisters a meta key for posts.
 *
 * @since 4.9.8
 *
 * @param string $post_type Post type the meta key is currently registered for. Pass
 *                          an empty string if the meta key is registered across all
 *                          existing post types.
 * @param string $meta_key  The meta key to unregister.
 * @return bool True on success, false if the meta key was not previously registered.
 */
function unregister_post_meta( $post_type, $meta_key ) {
	return unregister_meta_key( 'post', $meta_key, $post_type );
}

/**
 * Retrieve post meta fields, based on post ID.
 *
 * The post meta fields are retrieved from the cache where possible,
 * so the function is optimized to be called more than once.
 *
 * @since 1.2.0
 *
 * @param int $post_id Optional. Post ID. Default is ID of the global $post.
 * @return array Post meta for the given post.
 */
function get_post_custom( $post_id = 0 ) {
	$post_id = absint( $post_id );
	if ( ! $post_id )
		$post_id = get_the_ID();

	return get_post_meta( $post_id );
}

/**
 * Retrieve meta field names for a post.
 *
 * If there are no meta fields, then nothing (null) will be returned.
 *
 * @since 1.2.0
 *
 * @param int $post_id Optional. Post ID. Default is ID of the global $post.
 * @return array|void Array of the keys, if retrieved.
 */
function get_post_custom_keys( $post_id = 0 ) {
	$custom = get_post_custom( $post_id );

	if ( !is_array($custom) )
		return;

	if ( $keys = array_keys($custom) )
		return $keys;
}

/**
 * Retrieve values for a custom post field.
 *
 * The parameters must not be considered optional. All of the post meta fields
 * will be retrieved and only the meta field key values returned.
 *
 * @since 1.2.0
 *
 * @param string $key     Optional. Meta field key. Default empty.
 * @param int    $post_id Optional. Post ID. Default is ID of the global $post.
 * @return array|null Meta field values.
 */
function get_post_custom_values( $key = '', $post_id = 0 ) {
	if ( !$key )
		return null;

	$custom = get_post_custom($post_id);

	return isset($custom[$key]) ? $custom[$key] : null;
}

/**
 * Determines whether a post is sticky.
 *
 * Sticky posts should remain at the top of The Loop. If the post ID is not
 * given, then The Loop ID for the current post will be used.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 2.7.0
 *
 * @param int $post_id Optional. Post ID. Default is ID of the global $post.
 * @return bool Whether post is sticky.
 */
function is_sticky( $post_id = 0 ) {
	$post_id = absint( $post_id );

	if ( ! $post_id )
		$post_id = get_the_ID();

	$stickies = get_option( 'sticky_posts' );

	if ( ! is_array( $stickies ) )
		return false;

	if ( in_array( $post_id, $stickies ) )
		return true;

	return false;
}

/**
 * Sanitize every post field.
 *
 * If the context is 'raw', then the post object or array will get minimal
 * sanitization of the integer fields.
 *
 * @since 2.3.0
 *
 * @see sanitize_post_field()
 *
 * @param object|WP_Post|array $post    The Post Object or Array
 * @param string               $context Optional. How to sanitize post fields.
 *                                      Accepts 'raw', 'edit', 'db', or 'display'.
 *                                      Default 'display'.
 * @return object|WP_Post|array The now sanitized Post Object or Array (will be the
 *                              same type as $post).
 */
function sanitize_post( $post, $context = 'display' ) {
	if ( is_object($post) ) {
		// Check if post already filtered for this context.
		if ( isset($post->filter) && $context == $post->filter )
			return $post;
		if ( !isset($post->ID) )
			$post->ID = 0;
		foreach ( array_keys(get_object_vars($post)) as $field )
			$post->$field = sanitize_post_field($field, $post->$field, $post->ID, $context);
		$post->filter = $context;
	} elseif ( is_array( $post ) ) {
		// Check if post already filtered for this context.
		if ( isset($post['filter']) && $context == $post['filter'] )
			return $post;
		if ( !isset($post['ID']) )
			$post['ID'] = 0;
		foreach ( array_keys($post) as $field )
			$post[$field] = sanitize_post_field($field, $post[$field], $post['ID'], $context);
		$post['filter'] = $context;
	}
	return $post;
}

/**
 * Sanitize post field based on context.
 *
 * Possible context values are:  'raw', 'edit', 'db', 'display', 'attribute' and
 * 'js'. The 'display' context is used by default. 'attribute' and 'js' contexts
 * are treated like 'display' when calling filters.
 *
 * @since 2.3.0
 * @since 4.4.0 Like `sanitize_post()`, `$context` defaults to 'display'.
 *
 * @param string $field   The Post Object field name.
 * @param mixed  $value   The Post Object value.
 * @param int    $post_id Post ID.
 * @param string $context Optional. How to sanitize post fields. Looks for 'raw', 'edit',
 *                        'db', 'display', 'attribute' and 'js'. Default 'display'.
 * @return mixed Sanitized value.
 */
function sanitize_post_field( $field, $value, $post_id, $context = 'display' ) {
	$int_fields = array('ID', 'post_parent', 'menu_order');
	if ( in_array($field, $int_fields) )
		$value = (int) $value;

	// Fields which contain arrays of integers.
	$array_int_fields = array( 'ancestors' );
	if ( in_array($field, $array_int_fields) ) {
		$value = array_map( 'absint', $value);
		return $value;
	}

	if ( 'raw' == $context )
		return $value;

	$prefixed = false;
	if ( false !== strpos($field, 'post_') ) {
		$prefixed = true;
		$field_no_prefix = str_replace('post_', '', $field);
	}

	if ( 'edit' == $context ) {
		$format_to_edit = array('post_content', 'post_excerpt', 'post_title', 'post_password');

		if ( $prefixed ) {

			/**
			 * Filters the value of a specific post field to edit.
			 *
			 * The dynamic portion of the hook name, `$field`, refers to the post
			 * field name.
			 *
			 * @since 2.3.0
			 *
			 * @param mixed $value   Value of the post field.
			 * @param int   $post_id Post ID.
			 */
			$value = apply_filters( "edit_{$field}", $value, $post_id );

			/**
			 * Filters the value of a specific post field to edit.
			 *
			 * The dynamic portion of the hook name, `$field_no_prefix`, refers to
			 * the post field name.
			 *
			 * @since 2.3.0
			 *
			 * @param mixed $value   Value of the post field.
			 * @param int   $post_id Post ID.
			 */
			$value = apply_filters( "{$field_no_prefix}_edit_pre", $value, $post_id );
		} else {
			$value = apply_filters( "edit_post_{$field}", $value, $post_id );
		}

		if ( in_array($field, $format_to_edit) ) {
			if ( 'post_content' == $field )
				$value = format_to_edit($value, user_can_richedit());
			else
				$value = format_to_edit($value);
		} else {
			$value = esc_attr($value);
		}
	} elseif ( 'db' == $context ) {
		if ( $prefixed ) {

			/**
			 * Filters the value of a specific post field before saving.
			 *
			 * The dynamic portion of the hook name, `$field`, refers to the post
			 * field name.
			 *
			 * @since 2.3.0
			 *
			 * @param mixed $value Value of the post field.
			 */
			$value = apply_filters( "pre_{$field}", $value );

			/**
			 * Filters the value of a specific field before saving.
			 *
			 * The dynamic portion of the hook name, `$field_no_prefix`, refers
			 * to the post field name.
			 *
			 * @since 2.3.0
			 *
			 * @param mixed $value Value of the post field.
			 */
			$value = apply_filters( "{$field_no_prefix}_save_pre", $value );
		} else {
			$value = apply_filters( "pre_post_{$field}", $value );

			/**
			 * Filters the value of a specific post field before saving.
			 *
			 * The dynamic portion of the hook name, `$field`, refers to the post
			 * field name.
			 *
			 * @since 2.3.0
			 *
			 * @param mixed $value Value of the post field.
			 */
			$value = apply_filters( "{$field}_pre", $value );
		}
	} else {

		// Use display filters by default.
		if ( $prefixed ) {

			/**
			 * Filters the value of a specific post field for display.
			 *
			 * The dynamic portion of the hook name, `$field`, refers to the post
			 * field name.
			 *
			 * @since 2.3.0
			 *
			 * @param mixed  $value   Value of the prefixed post field.
			 * @param int    $post_id Post ID.
			 * @param string $context Context for how to sanitize the field. Possible
			 *                        values include 'raw', 'edit', 'db', 'display',
			 *                        'attribute' and 'js'.
			 */
			$value = apply_filters( "{$field}", $value, $post_id, $context );
		} else {
			$value = apply_filters( "post_{$field}", $value, $post_id, $context );
		}

		if ( 'attribute' == $context ) {
			$value = esc_attr( $value );
		} elseif ( 'js' == $context ) {
			$value = esc_js( $value );
		}
	}

	return $value;
}

/**
 * Make a post sticky.
 *
 * Sticky posts should be displayed at the top of the front page.
 *
 * @since 2.7.0
 *
 * @param int $post_id Post ID.
 */
function stick_post( $post_id ) {
	$stickies = get_option('sticky_posts');

	if ( !is_array($stickies) )
		$stickies = array($post_id);

	if ( ! in_array($post_id, $stickies) )
		$stickies[] = $post_id;

	$updated = update_option( 'sticky_posts', $stickies );

	if ( $updated ) {
		/**
		 * Fires once a post has been added to the sticky list.
		 *
		 * @since 4.6.0
		 *
		 * @param int $post_id ID of the post that was stuck.
		 */
		do_action( 'post_stuck', $post_id );
	}
}

/**
 * Un-stick a post.
 *
 * Sticky posts should be displayed at the top of the front page.
 *
 * @since 2.7.0
 *
 * @param int $post_id Post ID.
 */
function unstick_post( $post_id ) {
	$stickies = get_option('sticky_posts');

	if ( !is_array($stickies) )
		return;

	if ( ! in_array($post_id, $stickies) )
		return;

	$offset = array_search($post_id, $stickies);
	if ( false === $offset )
		return;

	array_splice($stickies, $offset, 1);

	$updated = update_option( 'sticky_posts', $stickies );

	if ( $updated ) {
		/**
		 * Fires once a post has been removed from the sticky list.
		 *
		 * @since 4.6.0
		 *
		 * @param int $post_id ID of the post that was unstuck.
		 */
		do_action( 'post_unstuck', $post_id );
	}
}

/**
 * Return the cache key for wp_count_posts() based on the passed arguments.
 *
 * @since 3.9.0
 *
 * @param string $type Optional. Post type to retrieve count Default 'post'.
 * @param string $perm Optional. 'readable' or empty. Default empty.
 * @return string The cache key.
 */
function _count_posts_cache_key( $type = 'post', $perm = '' ) {
	$cache_key = 'posts-' . $type;
	if ( 'readable' == $perm && is_user_logged_in() ) {
		$post_type_object = get_post_type_object( $type );
		if ( $post_type_object && ! current_user_can( $post_type_object->cap->read_private_posts ) ) {
			$cache_key .= '_' . $perm . '_' . get_current_user_id();
		}
	}
	return $cache_key;
}

/**
 * Count number of posts of a post type and if user has permissions to view.
 *
 * This function provides an efficient method of finding the amount of post's
 * type a blog has. Another method is to count the amount of items in
 * get_posts(), but that method has a lot of overhead with doing so. Therefore,
 * when developing for 2.5+, use this function instead.
 *
 * The $perm parameter checks for 'readable' value and if the user can read
 * private posts, it will display that for the user that is signed in.
 *
 * @since 2.5.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $type Optional. Post type to retrieve count. Default 'post'.
 * @param string $perm Optional. 'readable' or empty. Default empty.
 * @return object Number of posts for each status.
 */
function wp_count_posts( $type = 'post', $perm = '' ) {
	global $wpdb;

	if ( ! post_type_exists( $type ) )
		return new stdClass;

	$cache_key = _count_posts_cache_key( $type, $perm );

	$counts = wp_cache_get( $cache_key, 'counts' );
	if ( false !== $counts ) {
		/** This filter is documented in wp-includes/post.php */
		return apply_filters( 'wp_count_posts', $counts, $type, $perm );
	}

	$query = "SELECT post_status, COUNT( * ) AS num_posts FROM {$wpdb->posts} WHERE post_type = %s";
	if ( 'readable' == $perm && is_user_logged_in() ) {
		$post_type_object = get_post_type_object($type);
		if ( ! current_user_can( $post_type_object->cap->read_private_posts ) ) {
			$query .= $wpdb->prepare( " AND (post_status != 'private' OR ( post_author = %d AND post_status = 'private' ))",
				get_current_user_id()
			);
		}
	}
	$query .= ' GROUP BY post_status';

	$results = (array) $wpdb->get_results( $wpdb->prepare( $query, $type ), ARRAY_A );
	$counts = array_fill_keys( get_post_stati(), 0 );

	foreach ( $results as $row ) {
		$counts[ $row['post_status'] ] = $row['num_posts'];
	}

	$counts = (object) $counts;
	wp_cache_set( $cache_key, $counts, 'counts' );

	/**
	 * Modify returned post counts by status for the current post type.
	 *
	 * @since 3.7.0
	 *
	 * @param object $counts An object containing the current post_type's post
	 *                       counts by status.
	 * @param string $type   Post type.
	 * @param string $perm   The permission to determine if the posts are 'readable'
	 *                       by the current user.
	 */
	return apply_filters( 'wp_count_posts', $counts, $type, $perm );
}

/**
 * Count number of attachments for the mime type(s).
 *
 * If you set the optional mime_type parameter, then an array will still be
 * returned, but will only have the item you are looking for. It does not give
 * you the number of attachments that are children of a post. You can get that
 * by counting the number of children that post has.
 *
 * @since 2.5.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string|array $mime_type Optional. Array or comma-separated list of
 *                                MIME patterns. Default empty.
 * @return object An object containing the attachment counts by mime type.
 */
function wp_count_attachments( $mime_type = '' ) {
	global $wpdb;

	$and = wp_post_mime_type_where( $mime_type );
	$count = $wpdb->get_results( "SELECT post_mime_type, COUNT( * ) AS num_posts FROM $wpdb->posts WHERE post_type = 'attachment' AND post_status != 'trash' $and GROUP BY post_mime_type", ARRAY_A );

	$counts = array();
	foreach ( (array) $count as $row ) {
		$counts[ $row['post_mime_type'] ] = $row['num_posts'];
	}
	$counts['trash'] = $wpdb->get_var( "SELECT COUNT( * ) FROM $wpdb->posts WHERE post_type = 'attachment' AND post_status = 'trash' $and");

	/**
	 * Modify returned attachment counts by mime type.
	 *
	 * @since 3.7.0
	 *
	 * @param object $counts    An object containing the attachment counts by
	 *                          mime type.
	 * @param string $mime_type The mime type pattern used to filter the attachments
	 *                          counted.
	 */
	return apply_filters( 'wp_count_attachments', (object) $counts, $mime_type );
}

/**
 * Get default post mime types.
 *
 * @since 2.9.0
 *
 * @return array List of post mime types.
 */
function get_post_mime_types() {
	$post_mime_types = array(	//	array( adj, noun )
		'image' => array(__('Images'), __('Manage Images'), _n_noop('Image <span class="count">(%s)</span>', 'Images <span class="count">(%s)</span>')),
		'audio' => array(__('Audio'), __('Manage Audio'), _n_noop('Audio <span class="count">(%s)</span>', 'Audio <span class="count">(%s)</span>')),
		'video' => array(__('Video'), __('Manage Video'), _n_noop('Video <span class="count">(%s)</span>', 'Video <span class="count">(%s)</span>')),
	);

	/**
	 * Filters the default list of post mime types.
	 *
	 * @since 2.5.0
	 *
	 * @param array $post_mime_types Default list of post mime types.
	 */
	return apply_filters( 'post_mime_types', $post_mime_types );
}

/**
 * Check a MIME-Type against a list.
 *
 * If the wildcard_mime_types parameter is a string, it must be comma separated
 * list. If the real_mime_types is a string, it is also comma separated to
 * create the list.
 *
 * @since 2.5.0
 *
 * @param string|array $wildcard_mime_types Mime types, e.g. audio/mpeg or image (same as image/*)
 *                                          or flash (same as *flash*).
 * @param string|array $real_mime_types     Real post mime type values.
 * @return array array(wildcard=>array(real types)).
 */
function wp_match_mime_types( $wildcard_mime_types, $real_mime_types ) {
	$matches = array();
	if ( is_string( $wildcard_mime_types ) ) {
		$wildcard_mime_types = array_map( 'trim', explode( ',', $wildcard_mime_types ) );
	}
	if ( is_string( $real_mime_types ) ) {
		$real_mime_types = array_map( 'trim', explode( ',', $real_mime_types ) );
	}

	$patternses = array();
	$wild = '[-._a-z0-9]*';

	foreach ( (array) $wildcard_mime_types as $type ) {
		$mimes = array_map( 'trim', explode( ',', $type ) );
		foreach ( $mimes as $mime ) {
			$regex = str_replace( '__wildcard__', $wild, preg_quote( str_replace( '*', '__wildcard__', $mime ) ) );
			$patternses[][$type] = "^$regex$";
			if ( false === strpos( $mime, '/' ) ) {
				$patternses[][$type] = "^$regex/";
				$patternses[][$type] = $regex;
			}
		}
	}
	asort( $patternses );

	foreach ( $patternses as $patterns ) {
		foreach ( $patterns as $type => $pattern ) {
			foreach ( (array) $real_mime_types as $real ) {
				if ( preg_match( "#$pattern#", $real ) && ( empty( $matches[$type] ) || false === array_search( $real, $matches[$type] ) ) ) {
					$matches[$type][] = $real;
				}
			}
		}
	}
	return $matches;
}

/**
 * Convert MIME types into SQL.
 *
 * @since 2.5.0
 *
 * @param string|array $post_mime_types List of mime types or comma separated string
 *                                      of mime types.
 * @param string       $table_alias     Optional. Specify a table alias, if needed.
 *                                      Default empty.
 * @return string The SQL AND clause for mime searching.
 */
function wp_post_mime_type_where( $post_mime_types, $table_alias = '' ) {
	$where = '';
	$wildcards = array('', '%', '%/%');
	if ( is_string($post_mime_types) )
		$post_mime_types = array_map('trim', explode(',', $post_mime_types));

	$wheres = array();

	foreach ( (array) $post_mime_types as $mime_type ) {
		$mime_type = preg_replace('/\s/', '', $mime_type);
		$slashpos = strpos($mime_type, '/');
		if ( false !== $slashpos ) {
			$mime_group = preg_replace('/[^-*.a-zA-Z0-9]/', '', substr($mime_type, 0, $slashpos));
			$mime_subgroup = preg_replace('/[^-*.+a-zA-Z0-9]/', '', substr($mime_type, $slashpos + 1));
			if ( empty($mime_subgroup) )
				$mime_subgroup = '*';
			else
				$mime_subgroup = str_replace('/', '', $mime_subgroup);
			$mime_pattern = "$mime_group/$mime_subgroup";
		} else {
			$mime_pattern = preg_replace('/[^-*.a-zA-Z0-9]/', '', $mime_type);
			if ( false === strpos($mime_pattern, '*') )
				$mime_pattern .= '/*';
		}

		$mime_pattern = preg_replace('/\*+/', '%', $mime_pattern);

		if ( in_array( $mime_type, $wildcards ) )
			return '';

		if ( false !== strpos($mime_pattern, '%') )
			$wheres[] = empty($table_alias) ? "post_mime_type LIKE '$mime_pattern'" : "$table_alias.post_mime_type LIKE '$mime_pattern'";
		else
			$wheres[] = empty($table_alias) ? "post_mime_type = '$mime_pattern'" : "$table_alias.post_mime_type = '$mime_pattern'";
	}
	if ( !empty($wheres) )
		$where = ' AND (' . join(' OR ', $wheres) . ') ';
	return $where;
}

/**
 * Trash or delete a post or page.
 *
 * When the post and page is permanently deleted, everything that is tied to
 * it is deleted also. This includes comments, post meta fields, and terms
 * associated with the post.
 *
 * The post or page is moved to trash instead of permanently deleted unless
 * trash is disabled, item is already in the trash, or $force_delete is true.
 *
 * @since 1.0.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 * @see wp_delete_attachment()
 * @see wp_trash_post()
 *
 * @param int  $postid       Optional. Post ID. Default 0.
 * @param bool $force_delete Optional. Whether to bypass trash and force deletion.
 *                           Default false.
 * @return WP_Post|false|null Post data on success, false or null on failure.
 */
function wp_delete_post( $postid = 0, $force_delete = false ) {
	global $wpdb;

	$post = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->posts WHERE ID = %d", $postid ) );

	if ( ! $post ) {
		return $post;
	}

	$post = get_post( $post );

	if ( ! $force_delete && ( 'post' === $post->post_type || 'page' === $post->post_type ) && 'trash' !== get_post_status( $postid ) && EMPTY_TRASH_DAYS ) {
		return wp_trash_post( $postid );
	}

	if ( 'attachment' === $post->post_type ) {
		return wp_delete_attachment( $postid, $force_delete );
	}

	/**
	 * Filters whether a post deletion should take place.
	 *
	 * @since 4.4.0
	 *
	 * @param bool    $delete       Whether to go forward with deletion.
	 * @param WP_Post $post         Post object.
	 * @param bool    $force_delete Whether to bypass the trash.
	 */
	$check = apply_filters( 'pre_delete_post', null, $post, $force_delete );
	if ( null !== $check ) {
		return $check;
	}

	/**
	 * Fires before a post is deleted, at the start of wp_delete_post().
	 *
	 * @since 3.2.0
	 *
	 * @see wp_delete_post()
	 *
	 * @param int $postid Post ID.
	 */
	do_action( 'before_delete_post', $postid );

	delete_post_meta($postid,'_wp_trash_meta_status');
	delete_post_meta($postid,'_wp_trash_meta_time');

	wp_delete_object_term_relationships($postid, get_object_taxonomies($post->post_type));

	$parent_data = array( 'post_parent' => $post->post_parent );
	$parent_where = array( 'post_parent' => $postid );

	if ( is_post_type_hierarchical( $post->post_type ) ) {
		// Point children of this page to its parent, also clean the cache of affected children.
		$children_query = $wpdb->prepare( "SELECT * FROM $wpdb->posts WHERE post_parent = %d AND post_type = %s", $postid, $post->post_type );
		$children = $wpdb->get_results( $children_query );
		if ( $children ) {
			$wpdb->update( $wpdb->posts, $parent_data, $parent_where + array( 'post_type' => $post->post_type ) );
		}
	}

	// Do raw query. wp_get_post_revisions() is filtered.
	$revision_ids = $wpdb->get_col( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE post_parent = %d AND post_type = 'revision'", $postid ) );
	// Use wp_delete_post (via wp_delete_post_revision) again. Ensures any meta/misplaced data gets cleaned up.
	foreach ( $revision_ids as $revision_id )
		wp_delete_post_revision( $revision_id );

	// Point all attachments to this post up one level.
	$wpdb->update( $wpdb->posts, $parent_data, $parent_where + array( 'post_type' => 'attachment' ) );

	wp_defer_comment_counting( true );

	$comment_ids = $wpdb->get_col( $wpdb->prepare( "SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = %d", $postid ));
	foreach ( $comment_ids as $comment_id ) {
		wp_delete_comment( $comment_id, true );
	}

	wp_defer_comment_counting( false );

	$post_meta_ids = $wpdb->get_col( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE post_id = %d ", $postid ));
	foreach ( $post_meta_ids as $mid )
		delete_metadata_by_mid( 'post', $mid );

	/**
	 * Fires immediately before a post is deleted from the database.
	 *
	 * @since 1.2.0
	 *
	 * @param int $postid Post ID.
	 */
	do_action( 'delete_post', $postid );
	$result = $wpdb->delete( $wpdb->posts, array( 'ID' => $postid ) );
	if ( ! $result ) {
		return false;
	}

	/**
	 * Fires immediately after a post is deleted from the database.
	 *
	 * @since 2.2.0
	 *
	 * @param int $postid Post ID.
	 */
	do_action( 'deleted_post', $postid );

	clean_post_cache( $post );

	if ( is_post_type_hierarchical( $post->post_type ) && $children ) {
		foreach ( $children as $child )
			clean_post_cache( $child );
	}

	wp_clear_scheduled_hook('publish_future_post', array( $postid ) );

	/**
	 * Fires after a post is deleted, at the conclusion of wp_delete_post().
	 *
	 * @since 3.2.0
	 *
	 * @see wp_delete_post()
	 *
	 * @param int $postid Post ID.
	 */
	do_action( 'after_delete_post', $postid );

	return $post;
}

/**
 * Reset the page_on_front, show_on_front, and page_for_post settings when
 * a linked page is deleted or trashed.
 *
 * Also ensures the post is no longer sticky.
 *
 * @since 3.7.0
 * @access private
 *
 * @param int $post_id Post ID.
 */
function _reset_front_page_settings_for_post( $post_id ) {
	$post = get_post( $post_id );
	if ( 'page' == $post->post_type ) {
	 	/*
	 	 * If the page is defined in option page_on_front or post_for_posts,
	 	 * adjust the corresponding options.
	 	 */
		if ( get_option( 'page_on_front' ) == $post->ID ) {
			update_option( 'show_on_front', 'posts' );
			update_option( 'page_on_front', 0 );
		}
		if ( get_option( 'page_for_posts' ) == $post->ID ) {
			delete_option( 'page_for_posts', 0 );
		}
	}
	unstick_post( $post->ID );
}

/**
 * Move a post or page to the Trash
 *
 * If trash is disabled, the post or page is permanently deleted.
 *
 * @since 2.9.0
 *
 * @see wp_delete_post()
 *
 * @param int $post_id Optional. Post ID. Default is ID of the global $post
 *                     if EMPTY_TRASH_DAYS equals true.
 * @return WP_Post|false|null Post data on success, false or null on failure.
 */
function wp_trash_post( $post_id = 0 ) {
	if ( ! EMPTY_TRASH_DAYS ) {
		return wp_delete_post( $post_id, true );
	}

	$post = get_post( $post_id );

	if ( ! $post ) {
		return $post;
	}

	if ( 'trash' === $post->post_status ) {
		return false;
	}

	/**
	 * Filters whether a post trashing should take place.
	 *
	 * @since 4.9.0
	 *
	 * @param bool    $trash Whether to go forward with trashing.
	 * @param WP_Post $post  Post object.
	 */
	$check = apply_filters( 'pre_trash_post', null, $post );
	if ( null !== $check ) {
		return $check;
	}

	/**
	 * Fires before a post is sent to the trash.
	 *
	 * @since 3.3.0
	 *
	 * @param int $post_id Post ID.
	 */
	do_action( 'wp_trash_post', $post_id );

	add_post_meta( $post_id, '_wp_trash_meta_status', $post->post_status );
	add_post_meta( $post_id, '_wp_trash_meta_time', time() );

	wp_update_post( array( 'ID' => $post_id, 'post_status' => 'trash' ) );

	wp_trash_post_comments( $post_id );

	/**
	 * Fires after a post is sent to the trash.
	 *
	 * @since 2.9.0
	 *
	 * @param int $post_id Post ID.
	 */
	do_action( 'trashed_post', $post_id );

	return $post;
}

/**
 * Restore a post or page from the Trash.
 *
 * @since 2.9.0
 *
 * @param int $post_id Optional. Post ID. Default is ID of the global $post.
 * @return WP_Post|false|null Post data on success, false or null on failure.
 */
function wp_untrash_post( $post_id = 0 ) {
	$post = get_post( $post_id );

	if ( ! $post ) {
		return $post;
	}

	if ( 'trash' !== $post->post_status ) {
		return false;
	}

	/**
	 * Filters whether a post untrashing should take place.
	 *
	 * @since 4.9.0
	 *
	 * @param bool    $untrash Whether to go forward with untrashing.
	 * @param WP_Post $post    Post object.
	 */
	$check = apply_filters( 'pre_untrash_post', null, $post );
	if ( null !== $check ) {
		return $check;
	}

	/**
	 * Fires before a post is restored from the trash.
	 *
	 * @since 2.9.0
	 *
	 * @param int $post_id Post ID.
	 */
	do_action( 'untrash_post', $post_id );

	$post_status = get_post_meta( $post_id, '_wp_trash_meta_status', true );

	delete_post_meta( $post_id, '_wp_trash_meta_status' );
	delete_post_meta( $post_id, '_wp_trash_meta_time' );

	wp_update_post( array( 'ID' => $post_id, 'post_status' => $post_status ) );

	wp_untrash_post_comments( $post_id );

	/**
	 * Fires after a post is restored from the trash.
	 *
	 * @since 2.9.0
	 *
	 * @param int $post_id Post ID.
	 */
	do_action( 'untrashed_post', $post_id );

	return $post;
}

/**
 * Moves comments for a post to the trash.
 *
 * @since 2.9.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int|WP_Post|null $post Optional. Post ID or post object. Defaults to global $post.
 * @return mixed|void False on failure.
 */
function wp_trash_post_comments( $post = null ) {
	global $wpdb;

	$post = get_post($post);
	if ( empty($post) )
		return;

	$post_id = $post->ID;

	/**
	 * Fires before comments are sent to the trash.
	 *
	 * @since 2.9.0
	 *
	 * @param int $post_id Post ID.
	 */
	do_action( 'trash_post_comments', $post_id );

	$comments = $wpdb->get_results( $wpdb->prepare("SELECT comment_ID, comment_approved FROM $wpdb->comments WHERE comment_post_ID = %d", $post_id) );
	if ( empty($comments) )
		return;

	// Cache current status for each comment.
	$statuses = array();
	foreach ( $comments as $comment )
		$statuses[$comment->comment_ID] = $comment->comment_approved;
	add_post_meta($post_id, '_wp_trash_meta_comments_status', $statuses);

	// Set status for all comments to post-trashed.
	$result = $wpdb->update($wpdb->comments, array('comment_approved' => 'post-trashed'), array('comment_post_ID' => $post_id));

	clean_comment_cache( array_keys($statuses) );

	/**
	 * Fires after comments are sent to the trash.
	 *
	 * @since 2.9.0
	 *
	 * @param int   $post_id  Post ID.
	 * @param array $statuses Array of comment statuses.
	 */
	do_action( 'trashed_post_comments', $post_id, $statuses );

	return $result;
}

/**
 * Restore comments for a post from the trash.
 *
 * @since 2.9.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int|WP_Post|null $post Optional. Post ID or post object. Defaults to global $post.
 * @return true|void
 */
function wp_untrash_post_comments( $post = null ) {
	global $wpdb;

	$post = get_post($post);
	if ( empty($post) )
		return;

	$post_id = $post->ID;

	$statuses = get_post_meta($post_id, '_wp_trash_meta_comments_status', true);

	if ( empty($statuses) )
		return true;

	/**
	 * Fires before comments are restored for a post from the trash.
	 *
	 * @since 2.9.0
	 *
	 * @param int $post_id Post ID.
	 */
	do_action( 'untrash_post_comments', $post_id );

	// Restore each comment to its original status.
	$group_by_status = array();
	foreach ( $statuses as $comment_id => $comment_status )
		$group_by_status[$comment_status][] = $comment_id;

	foreach ( $group_by_status as $status => $comments ) {
		// Sanity check. This shouldn't happen.
		if ( 'post-trashed' == $status ) {
			$status = '0';
		}
		$comments_in = implode( ', ', array_map( 'intval', $comments ) );
		$wpdb->query( $wpdb->prepare( "UPDATE $wpdb->comments SET comment_approved = %s WHERE comment_ID IN ($comments_in)", $status ) );
	}

	clean_comment_cache( array_keys($statuses) );

	delete_post_meta($post_id, '_wp_trash_meta_comments_status');

	/**
	 * Fires after comments are restored for a post from the trash.
	 *
	 * @since 2.9.0
	 *
	 * @param int $post_id Post ID.
	 */
	do_action( 'untrashed_post_comments', $post_id );
}

/**
 * Retrieve the list of categories for a post.
 *
 * Compatibility layer for themes and plugins. Also an easy layer of abstraction
 * away from the complexity of the taxonomy layer.
 *
 * @since 2.1.0
 *
 * @see wp_get_object_terms()
 *
 * @param int   $post_id Optional. The Post ID. Does not default to the ID of the
 *                       global $post. Default 0.
 * @param array $args    Optional. Category query parameters. Default empty array.
 *                       See WP_Term_Query::__construct() for supported arguments.
 * @return array|WP_Error List of categories. If the `$fields` argument passed via `$args` is 'all' or
 *                        'all_with_object_id', an array of WP_Term objects will be returned. If `$fields`
 *                        is 'ids', an array of category ids. If `$fields` is 'names', an array of category names.
 *                        WP_Error object if 'category' taxonomy doesn't exist.
 */
function wp_get_post_categories( $post_id = 0, $args = array() ) {
	$post_id = (int) $post_id;

	$defaults = array('fields' => 'ids');
	$args = wp_parse_args( $args, $defaults );

	$cats = wp_get_object_terms($post_id, 'category', $args);
	return $cats;
}

/**
 * Retrieve the tags for a post.
 *
 * There is only one default for this function, called 'fields' and by default
 * is set to 'all'. There are other defaults that can be overridden in
 * wp_get_object_terms().
 *
 * @since 2.3.0
 *
 * @param int   $post_id Optional. The Post ID. Does not default to the ID of the
 *                       global $post. Default 0.
 * @param array $args    Optional. Tag query parameters. Default empty array.
 *                       See WP_Term_Query::__construct() for supported arguments.
 * @return array|WP_Error Array of WP_Term objects on success or empty array if no tags were found.
 *                        WP_Error object if 'post_tag' taxonomy doesn't exist.
 */
function wp_get_post_tags( $post_id = 0, $args = array() ) {
	return wp_get_post_terms( $post_id, 'post_tag', $args);
}

/**
 * Retrieves the terms for a post.
 *
 * @since 2.8.0
 *
 * @param int          $post_id  Optional. The Post ID. Does not default to the ID of the
 *                               global $post. Default 0.
 * @param string|array $taxonomy Optional. The taxonomy slug or array of slugs for which
 *                               to retrieve terms. Default 'post_tag'.
 * @param array        $args     {
 *     Optional. Term query parameters. See WP_Term_Query::__construct() for supported arguments.
 *
 *     @type string $fields Term fields to retrieve. Default 'all'.
 * }
 * @return array|WP_Error Array of WP_Term objects on success or empty array if no terms were found.
 *                        WP_Error object if `$taxonomy` doesn't exist.
 */
function wp_get_post_terms( $post_id = 0, $taxonomy = 'post_tag', $args = array() ) {
	$post_id = (int) $post_id;

	$defaults = array('fields' => 'all');
	$args = wp_parse_args( $args, $defaults );

	$tags = wp_get_object_terms($post_id, $taxonomy, $args);

	return $tags;
}

/**
 * Retrieve a number of recent posts.
 *
 * @since 1.0.0
 *
 * @see get_posts()
 *
 * @param array  $args   Optional. Arguments to retrieve posts. Default empty array.
 * @param string $output Optional. The required return type. One of OBJECT or ARRAY_A, which correspond to
 *                       a WP_Post object or an associative array, respectively. Default ARRAY_A.
 * @return array|false Array of recent posts, where the type of each element is determined by $output parameter.
 *                     Empty array on failure.
 */
function wp_get_recent_posts( $args = array(), $output = ARRAY_A ) {

	if ( is_numeric( $args ) ) {
		_deprecated_argument( __FUNCTION__, '3.1.0', __( 'Passing an integer number of posts is deprecated. Pass an array of arguments instead.' ) );
		$args = array( 'numberposts' => absint( $args ) );
	}

	// Set default arguments.
	$defaults = array(
		'numberposts' => 10, 'offset' => 0,
		'category' => 0, 'orderby' => 'post_date',
		'order' => 'DESC', 'include' => '',
		'exclude' => '', 'meta_key' => '',
		'meta_value' =>'', 'post_type' => 'post', 'post_status' => 'draft, publish, future, pending, private',
		'suppress_filters' => true
	);

	$r = wp_parse_args( $args, $defaults );

	$results = get_posts( $r );

	// Backward compatibility. Prior to 3.1 expected posts to be returned in array.
	if ( ARRAY_A == $output ){
		foreach ( $results as $key => $result ) {
			$results[$key] = get_object_vars( $result );
		}
		return $results ? $results : array();
	}

	return $results ? $results : false;

}

/**
 * Insert or update a post.
 *
 * If the $postarr parameter has 'ID' set to a value, then post will be updated.
 *
 * You can set the post date manually, by setting the values for 'post_date'
 * and 'post_date_gmt' keys. You can close the comments or open the comments by
 * setting the value for 'comment_status' key.
 *
 * @since 1.0.0
 * @since 4.2.0 Support was added for encoding emoji in the post title, content, and excerpt.
 * @since 4.4.0 A 'meta_input' array can now be passed to `$postarr` to add post meta data.
 *
 * @see sanitize_post()
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param array $postarr {
 *     An array of elements that make up a post to update or insert.
 *
 *     @type int    $ID                    The post ID. If equal to something other than 0,
 *                                         the post with that ID will be updated. Default 0.
 *     @type int    $post_author           The ID of the user who added the post. Default is
 *                                         the current user ID.
 *     @type string $post_date             The date of the post. Default is the current time.
 *     @type string $post_date_gmt         The date of the post in the GMT timezone. Default is
 *                                         the value of `$post_date`.
 *     @type mixed  $post_content          The post content. Default empty.
 *     @type string $post_content_filtered The filtered post content. Default empty.
 *     @type string $post_title            The post title. Default empty.
 *     @type string $post_excerpt          The post excerpt. Default empty.
 *     @type string $post_status           The post status. Default 'draft'.
 *     @type string $post_type             The post type. Default 'post'.
 *     @type string $comment_status        Whether the post can accept comments. Accepts 'open' or 'closed'.
 *                                         Default is the value of 'default_comment_status' option.
 *     @type string $ping_status           Whether the post can accept pings. Accepts 'open' or 'closed'.
 *                                         Default is the value of 'default_ping_status' option.
 *     @type string $post_password         The password to access the post. Default empty.
 *     @type string $post_name             The post name. Default is the sanitized post title
 *                                         when creating a new post.
 *     @type string $to_ping               Space or carriage return-separated list of URLs to ping.
 *                                         Default empty.
 *     @type string $pinged                Space or carriage return-separated list of URLs that have
 *                                         been pinged. Default empty.
 *     @type string $post_modified         The date when the post was last modified. Default is
 *                                         the current time.
 *     @type string $post_modified_gmt     The date when the post was last modified in the GMT
 *                                         timezone. Default is the current time.
 *     @type int    $post_parent           Set this for the post it belongs to, if any. Default 0.
 *     @type int    $menu_order            The order the post should be displayed in. Default 0.
 *     @type string $post_mime_type        The mime type of the post. Default empty.
 *     @type string $guid                  Global Unique ID for referencing the post. Default empty.
 *     @type array  $post_category         Array of category names, slugs, or IDs.
 *                                         Defaults to value of the 'default_category' option.
 *     @type array  $tags_input            Array of tag names, slugs, or IDs. Default empty.
 *     @type array  $tax_input             Array of taxonomy terms keyed by their taxonomy name. Default empty.
 *     @type array  $meta_input            Array of post meta values keyed by their post meta key. Default empty.
 * }
 * @param bool  $wp_error Optional. Whether to return a WP_Error on failure. Default false.
 * @return int|WP_Error The post ID on success. The value 0 or WP_Error on failure.
 */
function wp_insert_post( $postarr, $wp_error = false ) {
	global $wpdb;

	// Capture original pre-sanitized array for passing into filters.
	$unsanitized_postarr = $postarr;

	$user_id = get_current_user_id();

	$defaults = array(
		'post_author' => $user_id,
		'post_content' => '',
		'post_content_filtered' => '',
		'post_title' => '',
		'post_excerpt' => '',
		'post_status' => 'draft',
		'post_type' => 'post',
		'comment_status' => '',
		'ping_status' => '',
		'post_password' => '',
		'to_ping' =>  '',
		'pinged' => '',
		'post_parent' => 0,
		'menu_order' => 0,
		'guid' => '',
		'import_id' => 0,
		'context' => '',
	);

	$postarr = wp_parse_args($postarr, $defaults);

	unset( $postarr[ 'filter' ] );

	$postarr = sanitize_post($postarr, 'db');

	// Are we updating or creating?
	$post_ID = 0;
	$update = false;
	$guid = $postarr['guid'];

	if ( ! empty( $postarr['ID'] ) ) {
		$update = true;

		// Get the post ID and GUID.
		$post_ID = $postarr['ID'];
		$post_before = get_post( $post_ID );
		if ( is_null( $post_before ) ) {
			if ( $wp_error ) {
				return new WP_Error( 'invalid_post', __( 'Invalid post ID.' ) );
			}
			return 0;
		}

		$guid = get_post_field( 'guid', $post_ID );
		$previous_status = get_post_field('post_status', $post_ID );
	} else {
		$previous_status = 'new';
	}

	$post_type = empty( $postarr['post_type'] ) ? 'post' : $postarr['post_type'];

	$post_title = $postarr['post_title'];
	$post_content = $postarr['post_content'];
	$post_excerpt = $postarr['post_excerpt'];
	if ( isset( $postarr['post_name'] ) ) {
		$post_name = $postarr['post_name'];
	} elseif ( $update ) {
		// For an update, don't modify the post_name if it wasn't supplied as an argument.
		$post_name = $post_before->post_name;
	}

	$maybe_empty = 'attachment' !== $post_type
		&& ! $post_content && ! $post_title && ! $post_excerpt
		&& post_type_supports( $post_type, 'editor' )
		&& post_type_supports( $post_type, 'title' )
		&& post_type_supports( $post_type, 'excerpt' );

	/**
	 * Filters whether the post should be considered "empty".
	 *
	 * The post is considered "empty" if both:
	 * 1. The post type supports the title, editor, and excerpt fields
	 * 2. The title, editor, and excerpt fields are all empty
	 *
	 * Returning a truthy value to the filter will effectively short-circuit
	 * the new post being inserted, returning 0. If $wp_error is true, a WP_Error
	 * will be returned instead.
	 *
	 * @since 3.3.0
	 *
	 * @param bool  $maybe_empty Whether the post should be considered "empty".
	 * @param array $postarr     Array of post data.
	 */
	if ( apply_filters( 'wp_insert_post_empty_content', $maybe_empty, $postarr ) ) {
		if ( $wp_error ) {
			return new WP_Error( 'empty_content', __( 'Content, title, and excerpt are empty.' ) );
		} else {
			return 0;
		}
	}

	$post_status = empty( $postarr['post_status'] ) ? 'draft' : $postarr['post_status'];
	if ( 'attachment' === $post_type && ! in_array( $post_status, array( 'inherit', 'private', 'trash', 'auto-draft' ), true ) ) {
		$post_status = 'inherit';
	}

	if ( ! empty( $postarr['post_category'] ) ) {
		// Filter out empty terms.
		$post_category = array_filter( $postarr['post_category'] );
	}

	// Make sure we set a valid category.
	if ( empty( $post_category ) || 0 == count( $post_category ) || ! is_array( $post_category ) ) {
		// 'post' requires at least one category.
		if ( 'post' == $post_type && 'auto-draft' != $post_status ) {
			$post_category = array( get_option('default_category') );
		} else {
			$post_category = array();
		}
	}

	// Don't allow contributors to set the post slug for pending review posts.
	if ( 'pending' == $post_status && !current_user_can( 'publish_posts' ) ) {
		$post_name = '';
	}

	/*
	 * Create a valid post name. Drafts and pending posts are allowed to have
	 * an empty post name.
	 */
	if ( empty($post_name) ) {
		if ( !in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ) ) ) {
			$post_name = sanitize_title($post_title);
		} else {
			$post_name = '';
		}
	} else {
		// On updates, we need to check to see if it's using the old, fixed sanitization context.
		$check_name = sanitize_title( $post_name, '', 'old-save' );
		if ( $update && strtolower( urlencode( $post_name ) ) == $check_name && get_post_field( 'post_name', $post_ID ) == $check_name ) {
			$post_name = $check_name;
		} else { // new post, or slug has changed.
			$post_name = sanitize_title($post_name);
		}
	}

	/*
	 * If the post date is empty (due to having been new or a draft) and status
	 * is not 'draft' or 'pending', set date to now.
	 */
	if ( empty( $postarr['post_date'] ) || '0000-00-00 00:00:00' == $postarr['post_date'] ) {
		if ( empty( $postarr['post_date_gmt'] ) || '0000-00-00 00:00:00' == $postarr['post_date_gmt'] ) {
			$post_date = current_time( 'mysql' );
		} else {
			$post_date = get_date_from_gmt( $postarr['post_date_gmt'] );
		}
	} else {
		$post_date = $postarr['post_date'];
	}

	// Validate the date.
	$mm = substr( $post_date, 5, 2 );
	$jj = substr( $post_date, 8, 2 );
	$aa = substr( $post_date, 0, 4 );
	$valid_date = wp_checkdate( $mm, $jj, $aa, $post_date );
	if ( ! $valid_date ) {
		if ( $wp_error ) {
			return new WP_Error( 'invalid_date', __( 'Invalid date.' ) );
		} else {
			return 0;
		}
	}

	if ( empty( $postarr['post_date_gmt'] ) || '0000-00-00 00:00:00' == $postarr['post_date_gmt'] ) {
		if ( ! in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ) ) ) {
			$post_date_gmt = get_gmt_from_date( $post_date );
		} else {
			$post_date_gmt = '0000-00-00 00:00:00';
		}
	} else {
		$post_date_gmt = $postarr['post_date_gmt'];
	}

	if ( $update || '0000-00-00 00:00:00' == $post_date ) {
		$post_modified     = current_time( 'mysql' );
		$post_modified_gmt = current_time( 'mysql', 1 );
	} else {
		$post_modified     = $post_date;
		$post_modified_gmt = $post_date_gmt;
	}

	if ( 'attachment' !== $post_type ) {
		if ( 'publish' == $post_status ) {
			$now = gmdate('Y-m-d H:i:59');
			if ( mysql2date('U', $post_date_gmt, false) > mysql2date('U', $now, false) ) {
				$post_status = 'future';
			}
		} elseif ( 'future' == $post_status ) {
			$now = gmdate('Y-m-d H:i:59');
			if ( mysql2date('U', $post_date_gmt, false) <= mysql2date('U', $now, false) ) {
				$post_status = 'publish';
			}
		}
	}

	// Comment status.
	if ( empty( $postarr['comment_status'] ) ) {
		if ( $update ) {
			$comment_status = 'closed';
		} else {
			$comment_status = get_default_comment_status( $post_type );
		}
	} else {
		$comment_status = $postarr['comment_status'];
	}

	// These variables are needed by compact() later.
	$post_content_filtered = $postarr['post_content_filtered'];
	$post_author = isset( $postarr['post_author'] ) ? $postarr['post_author'] : $user_id;
	$ping_status = empty( $postarr['ping_status'] ) ? get_default_comment_status( $post_type, 'pingback' ) : $postarr['ping_status'];
	$to_ping = isset( $postarr['to_ping'] ) ? sanitize_trackback_urls( $postarr['to_ping'] ) : '';
	$pinged = isset( $postarr['pinged'] ) ? $postarr['pinged'] : '';
	$import_id = isset( $postarr['import_id'] ) ? $postarr['import_id'] : 0;

	/*
	 * The 'wp_insert_post_parent' filter expects all variables to be present.
	 * Previously, these variables would have already been extracted
	 */
	if ( isset( $postarr['menu_order'] ) ) {
		$menu_order = (int) $postarr['menu_order'];
	} else {
		$menu_order = 0;
	}

	$post_password = isset( $postarr['post_password'] ) ? $postarr['post_password'] : '';
	if ( 'private' == $post_status ) {
		$post_password = '';
	}

	if ( isset( $postarr['post_parent'] ) ) {
		$post_parent = (int) $postarr['post_parent'];
	} else {
		$post_parent = 0;
	}

	$new_postarr = array_merge(
		array(
			'ID' => $post_ID,
		),
		compact( array_diff( array_keys( $defaults ), array( 'context', 'filter' ) ) )
	);

	/**
	 * Filters the post parent -- used to check for and prevent hierarchy loops.
	 *
	 * @since 3.1.0
	 *
	 * @param int   $post_parent Post parent ID.
	 * @param int   $post_ID     Post ID.
	 * @param array $new_postarr Array of parsed post data.
	 * @param array $postarr     Array of sanitized, but otherwise unmodified post data.
	 */
	$post_parent = apply_filters( 'wp_insert_post_parent', $post_parent, $post_ID, $new_postarr, $postarr );

	/*
	 * If the post is being untrashed and it has a desired slug stored in post meta,
	 * reassign it.
	 */
	if ( 'trash' === $previous_status && 'trash' !== $post_status ) {
		$desired_post_slug = get_post_meta( $post_ID, '_wp_desired_post_slug', true );
		if ( $desired_post_slug ) {
			delete_post_meta( $post_ID, '_wp_desired_post_slug' );
			$post_name = $desired_post_slug;
		}
	}

	// If a trashed post has the desired slug, change it and let this post have it.
	if ( 'trash' !== $post_status && $post_name ) {
		wp_add_trashed_suffix_to_post_name_for_trashed_posts( $post_name, $post_ID );
	}

	// When trashing an existing post, change its slug to allow non-trashed posts to use it.
	if ( 'trash' === $post_status && 'trash' !== $previous_status && 'new' !== $previous_status ) {
		$post_name = wp_add_trashed_suffix_to_post_name_for_post( $post_ID );
	}

	$post_name = wp_unique_post_slug( $post_name, $post_ID, $post_status, $post_type, $post_parent );

	// Don't unslash.
	$post_mime_type = isset( $postarr['post_mime_type'] ) ? $postarr['post_mime_type'] : '';

	// Expected_slashed (everything!).
	$data = compact( 'post_author', 'post_date', 'post_date_gmt', 'post_content', 'post_content_filtered', 'post_title', 'post_excerpt', 'post_status', 'post_type', 'comment_status', 'ping_status', 'post_password', 'post_name', 'to_ping', 'pinged', 'post_modified', 'post_modified_gmt', 'post_parent', 'menu_order', 'post_mime_type', 'guid' );

	$emoji_fields = array( 'post_title', 'post_content', 'post_excerpt' );

	foreach ( $emoji_fields as $emoji_field ) {
		if ( isset( $data[ $emoji_field ] ) ) {
			$charset = $wpdb->get_col_charset( $wpdb->posts, $emoji_field );
			if ( 'utf8' === $charset ) {
				$data[ $emoji_field ] = wp_encode_emoji( $data[ $emoji_field ] );
			}
		}
	}

	if ( 'attachment' === $post_type ) {
		/**
		 * Filters attachment post data before it is updated in or added to the database.
		 *
		 * @since 3.9.0
		 * @since 5.4.1 `$unsanitized_postarr` argument added.
		 *
		 * @param array $data                An array of slashed, sanitized, and processed attachment post data.
		 * @param array $postarr             An array of slashed and sanitized attachment post data, but not processed.
		 * @param array $unsanitized_postarr An array of slashed yet *unsanitized* and unprocessed attachment post data
		 *                                   as originally passed to wp_insert_post().
		 */
		$data = apply_filters( 'wp_insert_attachment_data', $data, $postarr, $unsanitized_postarr );
	} else {
		/**
		 * Filters slashed post data just before it is inserted into the database.
		 *
		 * @since 2.7.0
		 * @since 5.4.1 `$unsanitized_postarr` argument added.
		 *
		 * @param array $data                An array of slashed, sanitized, and processed post data.
		 * @param array $postarr             An array of sanitized (and slashed) but otherwise unmodified post data.
		 * @param array $unsanitized_postarr An array of slashed yet *unsanitized* and unprocessed post data as
		 *                                   originally passed to wp_insert_post().
		 */
		$data = apply_filters( 'wp_insert_post_data', $data, $postarr, $unsanitized_postarr );
	}
	$data = wp_unslash( $data );
	$where = array( 'ID' => $post_ID );

	if ( $update ) {
		/**
		 * Fires immediately before an existing post is updated in the database.
		 *
		 * @since 2.5.0
		 *
		 * @param int   $post_ID Post ID.
		 * @param array $data    Array of unslashed post data.
		 */
		do_action( 'pre_post_update', $post_ID, $data );
		if ( false === $wpdb->update( $wpdb->posts, $data, $where ) ) {
			if ( $wp_error ) {
				return new WP_Error('db_update_error', __('Could not update post in the database'), $wpdb->last_error);
			} else {
				return 0;
			}
		}
	} else {
		// If there is a suggested ID, use it if not already present.
		if ( ! empty( $import_id ) ) {
			$import_id = (int) $import_id;
			if ( ! $wpdb->get_var( $wpdb->prepare("SELECT ID FROM $wpdb->posts WHERE ID = %d", $import_id) ) ) {
				$data['ID'] = $import_id;
			}
		}
		if ( false === $wpdb->insert( $wpdb->posts, $data ) ) {
			if ( $wp_error ) {
				return new WP_Error('db_insert_error', __('Could not insert post into the database'), $wpdb->last_error);
			} else {
				return 0;
			}
		}
		$post_ID = (int) $wpdb->insert_id;

		// Use the newly generated $post_ID.
		$where = array( 'ID' => $post_ID );
	}

	if ( empty( $data['post_name'] ) && ! in_array( $data['post_status'], array( 'draft', 'pending', 'auto-draft' ) ) ) {
		$data['post_name'] = wp_unique_post_slug( sanitize_title( $data['post_title'], $post_ID ), $post_ID, $data['post_status'], $post_type, $post_parent );
		$wpdb->update( $wpdb->posts, array( 'post_name' => $data['post_name'] ), $where );
		clean_post_cache( $post_ID );
	}

	if ( is_object_in_taxonomy( $post_type, 'category' ) ) {
		wp_set_post_categories( $post_ID, $post_category );
	}

	if ( isset( $postarr['tags_input'] ) && is_object_in_taxonomy( $post_type, 'post_tag' ) ) {
		wp_set_post_tags( $post_ID, $postarr['tags_input'] );
	}

	// New-style support for all custom taxonomies.
	if ( ! empty( $postarr['tax_input'] ) ) {
		foreach ( $postarr['tax_input'] as $taxonomy => $tags ) {
			$taxonomy_obj = get_taxonomy($taxonomy);
			if ( ! $taxonomy_obj ) {
				/* translators: %s: taxonomy name */
				_doing_it_wrong( __FUNCTION__, sprintf( __( 'Invalid taxonomy: %s.' ), $taxonomy ), '4.4.0' );
				continue;
			}

			// array = hierarchical, string = non-hierarchical.
			if ( is_array( $tags ) ) {
				$tags = array_filter($tags);
			}
			if ( current_user_can( $taxonomy_obj->cap->assign_terms ) ) {
				wp_set_post_terms( $post_ID, $tags, $taxonomy );
			}
		}
	}

	if ( ! empty( $postarr['meta_input'] ) ) {
		foreach ( $postarr['meta_input'] as $field => $value ) {
			update_post_meta( $post_ID, $field, $value );
		}
	}

	$current_guid = get_post_field( 'guid', $post_ID );

	// Set GUID.
	if ( ! $update && '' == $current_guid ) {
		$wpdb->update( $wpdb->posts, array( 'guid' => get_permalink( $post_ID ) ), $where );
	}

	if ( 'attachment' === $postarr['post_type'] ) {
		if ( ! empty( $postarr['file'] ) ) {
			update_attached_file( $post_ID, $postarr['file'] );
		}

		if ( ! empty( $postarr['context'] ) ) {
			add_post_meta( $post_ID, '_wp_attachment_context', $postarr['context'], true );
		}
	}

	// Set or remove featured image.
	if ( isset( $postarr['_thumbnail_id'] ) ) {
		$thumbnail_support = current_theme_supports( 'post-thumbnails', $post_type ) && post_type_supports( $post_type, 'thumbnail' ) || 'revision' === $post_type;
		if ( ! $thumbnail_support && 'attachment' === $post_type && $post_mime_type ) {
			if ( wp_attachment_is( 'audio', $post_ID ) ) {
				$thumbnail_support = post_type_supports( 'attachment:audio', 'thumbnail' ) || current_theme_supports( 'post-thumbnails', 'attachment:audio' );
			} elseif ( wp_attachment_is( 'video', $post_ID ) ) {
				$thumbnail_support = post_type_supports( 'attachment:video', 'thumbnail' ) || current_theme_supports( 'post-thumbnails', 'attachment:video' );
			}
		}

		if ( $thumbnail_support ) {
			$thumbnail_id = intval( $postarr['_thumbnail_id'] );
			if ( -1 === $thumbnail_id ) {
				delete_post_thumbnail( $post_ID );
			} else {
				set_post_thumbnail( $post_ID, $thumbnail_id );
			}
		}
	}

	clean_post_cache( $post_ID );

	$post = get_post( $post_ID );

	if ( ! empty( $postarr['page_template'] ) ) {
		$post->page_template = $postarr['page_template'];
		$page_templates = wp_get_theme()->get_page_templates( $post );
		if ( 'default' != $postarr['page_template'] && ! isset( $page_templates[ $postarr['page_template'] ] ) ) {
			if ( $wp_error ) {
				return new WP_Error( 'invalid_page_template', __( 'Invalid page template.' ) );
			}
			update_post_meta( $post_ID, '_wp_page_template', 'default' );
		} else {
			update_post_meta( $post_ID, '_wp_page_template', $postarr['page_template'] );
		}
	}

	if ( 'attachment' !== $postarr['post_type'] ) {
		wp_transition_post_status( $data['post_status'], $previous_status, $post );
	} else {
		if ( $update ) {
			/**
			 * Fires once an existing attachment has been updated.
			 *
			 * @since 2.0.0
			 *
			 * @param int $post_ID Attachment ID.
			 */
			do_action( 'edit_attachment', $post_ID );
			$post_after = get_post( $post_ID );

			/**
			 * Fires once an existing attachment has been updated.
			 *
			 * @since 4.4.0
			 *
			 * @param int     $post_ID      Post ID.
			 * @param WP_Post $post_after   Post object following the update.
			 * @param WP_Post $post_before  Post object before the update.
			 */
			do_action( 'attachment_updated', $post_ID, $post_after, $post_before );
		} else {

			/**
			 * Fires once an attachment has been added.
			 *
			 * @since 2.0.0
			 *
			 * @param int $post_ID Attachment ID.
			 */
			do_action( 'add_attachment', $post_ID );
		}

		return $post_ID;
	}

	if ( $update ) {
		/**
		 * Fires once an existing post has been updated.
		 *
		 * @since 1.2.0
		 *
		 * @param int     $post_ID Post ID.
		 * @param WP_Post $post    Post object.
		 */
		do_action( 'edit_post', $post_ID, $post );
		$post_after = get_post($post_ID);

		/**
		 * Fires once an existing post has been updated.
		 *
		 * @since 3.0.0
		 *
		 * @param int     $post_ID      Post ID.
		 * @param WP_Post $post_after   Post object following the update.
		 * @param WP_Post $post_before  Post object before the update.
		 */
		do_action( 'post_updated', $post_ID, $post_after, $post_before);
	}

	/**
	 * Fires once a post has been saved.
	 *
	 * The dynamic portion of the hook name, `$post->post_type`, refers to
	 * the post type slug.
	 *
	 * @since 3.7.0
	 *
	 * @param int     $post_ID Post ID.
	 * @param WP_Post $post    Post object.
	 * @param bool    $update  Whether this is an existing post being updated or not.
	 */
	do_action( "save_post_{$post->post_type}", $post_ID, $post, $update );

	/**
	 * Fires once a post has been saved.
	 *
	 * @since 1.5.0
	 *
	 * @param int     $post_ID Post ID.
	 * @param WP_Post $post    Post object.
	 * @param bool    $update  Whether this is an existing post being updated or not.
	 */
	do_action( 'save_post', $post_ID, $post, $update );

	/**
	 * Fires once a post has been saved.
	 *
	 * @since 2.0.0
	 *
	 * @param int     $post_ID Post ID.
	 * @param WP_Post $post    Post object.
	 * @param bool    $update  Whether this is an existing post being updated or not.
	 */
	do_action( 'wp_insert_post', $post_ID, $post, $update );

	return $post_ID;
}

/**
 * Update a post with new post data.
 *
 * The date does not have to be set for drafts. You can set the date and it will
 * not be overridden.
 *
 * @since 1.0.0
 *
 * @param array|object $postarr  Optional. Post data. Arrays are expected to be escaped,
 *                               objects are not. Default array.
 * @param bool         $wp_error Optional. Allow return of WP_Error on failure. Default false.
 * @return int|WP_Error The value 0 or WP_Error on failure. The post ID on success.
 */
function wp_update_post( $postarr = array(), $wp_error = false ) {
	if ( is_object($postarr) ) {
		// Non-escaped post was passed.
		$postarr = get_object_vars($postarr);
		$postarr = wp_slash($postarr);
	}

	// First, get all of the original fields.
	$post = get_post($postarr['ID'], ARRAY_A);

	if ( is_null( $post ) ) {
		if ( $wp_error )
			return new WP_Error( 'invalid_post', __( 'Invalid post ID.' ) );
		return 0;
	}

	// Escape data pulled from DB.
	$post = wp_slash($post);

	// Passed post category list overwrites existing category list if not empty.
	if ( isset($postarr['post_category']) && is_array($postarr['post_category'])
			 && 0 != count($postarr['post_category']) )
		$post_cats = $postarr['post_category'];
	else
		$post_cats = $post['post_category'];

	// Drafts shouldn't be assigned a date unless explicitly done so by the user.
	if ( isset( $post['post_status'] ) && in_array($post['post_status'], array('draft', 'pending', 'auto-draft')) && empty($postarr['edit_date']) &&
			 ('0000-00-00 00:00:00' == $post['post_date_gmt']) )
		$clear_date = true;
	else
		$clear_date = false;

	// Merge old and new fields with new fields overwriting old ones.
	$postarr = array_merge($post, $postarr);
	$postarr['post_category'] = $post_cats;
	if ( $clear_date ) {
		$postarr['post_date'] = current_time('mysql');
		$postarr['post_date_gmt'] = '';
	}

	if ($postarr['post_type'] == 'attachment')
		return wp_insert_attachment($postarr);

	return wp_insert_post( $postarr, $wp_error );
}

/**
 * Publish a post by transitioning the post status.
 *
 * @since 2.1.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int|WP_Post $post Post ID or post object.
 */
function wp_publish_post( $post ) {
	global $wpdb;

	if ( ! $post = get_post( $post ) )
		return;

	if ( 'publish' == $post->post_status )
		return;

	$wpdb->update( $wpdb->posts, array( 'post_status' => 'publish' ), array( 'ID' => $post->ID ) );

	clean_post_cache( $post->ID );

	$old_status = $post->post_status;
	$post->post_status = 'publish';
	wp_transition_post_status( 'publish', $old_status, $post );

	/** This action is documented in wp-includes/post.php */
	do_action( 'edit_post', $post->ID, $post );

	/** This action is documented in wp-includes/post.php */
	do_action( "save_post_{$post->post_type}", $post->ID, $post, true );

	/** This action is documented in wp-includes/post.php */
	do_action( 'save_post', $post->ID, $post, true );

	/** This action is documented in wp-includes/post.php */
	do_action( 'wp_insert_post', $post->ID, $post, true );
}

/**
 * Publish future post and make sure post ID has future post status.
 *
 * Invoked by cron 'publish_future_post' event. This safeguard prevents cron
 * from publishing drafts, etc.
 *
 * @since 2.5.0
 *
 * @param int|WP_Post $post_id Post ID or post object.
 */
function check_and_publish_future_post( $post_id ) {
	$post = get_post($post_id);

	if ( empty($post) )
		return;

	if ( 'future' != $post->post_status )
		return;

	$time = strtotime( $post->post_date_gmt . ' GMT' );

	// Uh oh, someone jumped the gun!
	if ( $time > time() ) {
		wp_clear_scheduled_hook( 'publish_future_post', array( $post_id ) ); // clear anything else in the system
		wp_schedule_single_event( $time, 'publish_future_post', array( $post_id ) );
		return;
	}

	// wp_publish_post() returns no meaningful value.
	wp_publish_post( $post_id );
}

/**
 * Computes a unique slug for the post, when given the desired slug and some post details.
 *
 * @since 2.8.0
 *
 * @global wpdb       $wpdb WordPress database abstraction object.
 * @global WP_Rewrite $wp_rewrite
 *
 * @param string $slug        The desired slug (post_name).
 * @param int    $post_ID     Post ID.
 * @param string $post_status No uniqueness checks are made if the post is still draft or pending.
 * @param string $post_type   Post type.
 * @param int    $post_parent Post parent ID.
 * @return string Unique slug for the post, based on $post_name (with a -1, -2, etc. suffix)
 */
function wp_unique_post_slug( $slug, $post_ID, $post_status, $post_type, $post_parent ) {
	if ( in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ) ) || ( 'inherit' == $post_status && 'revision' == $post_type ) || 'user_request' === $post_type )
		return $slug;

	global $wpdb, $wp_rewrite;

	$original_slug = $slug;

	$feeds = $wp_rewrite->feeds;
	if ( ! is_array( $feeds ) )
		$feeds = array();

	if ( 'attachment' == $post_type ) {
		// Attachment slugs must be unique across all types.
		$check_sql = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND ID != %d LIMIT 1";
		$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_ID ) );

		/**
		 * Filters whether the post slug would make a bad attachment slug.
		 *
		 * @since 3.1.0
		 *
		 * @param bool   $bad_slug Whether the slug would be bad as an attachment slug.
		 * @param string $slug     The post slug.
		 */
		if ( $post_name_check || in_array( $slug, $feeds ) || 'embed' === $slug || apply_filters( 'wp_unique_post_slug_is_bad_attachment_slug', false, $slug ) ) {
			$suffix = 2;
			do {
				$alt_post_name = _truncate_post_slug( $slug, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix";
				$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_ID ) );
				$suffix++;
			} while ( $post_name_check );
			$slug = $alt_post_name;
		}
	} elseif ( is_post_type_hierarchical( $post_type ) ) {
		if ( 'nav_menu_item' == $post_type )
			return $slug;

		/*
		 * Page slugs must be unique within their own trees. Pages are in a separate
		 * namespace than posts so page slugs are allowed to overlap post slugs.
		 */
		$check_sql = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND post_type IN ( %s, 'attachment' ) AND ID != %d AND post_parent = %d LIMIT 1";
		$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_type, $post_ID, $post_parent ) );

		/**
		 * Filters whether the post slug would make a bad hierarchical post slug.
		 *
		 * @since 3.1.0
		 *
		 * @param bool   $bad_slug    Whether the post slug would be bad in a hierarchical post context.
		 * @param string $slug        The post slug.
		 * @param string $post_type   Post type.
		 * @param int    $post_parent Post parent ID.
		 */
		if ( $post_name_check || in_array( $slug, $feeds ) || 'embed' === $slug || preg_match( "@^($wp_rewrite->pagination_base)?\d+$@", $slug )  || apply_filters( 'wp_unique_post_slug_is_bad_hierarchical_slug', false, $slug, $post_type, $post_parent ) ) {
			$suffix = 2;
			do {
				$alt_post_name = _truncate_post_slug( $slug, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix";
				$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_type, $post_ID, $post_parent ) );
				$suffix++;
			} while ( $post_name_check );
			$slug = $alt_post_name;
		}
	} else {
		// Post slugs must be unique across all posts.
		$check_sql = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND post_type = %s AND ID != %d LIMIT 1";
		$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_type, $post_ID ) );

		// Prevent new post slugs that could result in URLs that conflict with date archives.
		$post = get_post( $post_ID );
		$conflicts_with_date_archive = false;
		if ( 'post' === $post_type && ( ! $post || $post->post_name !== $slug ) && preg_match( '/^[0-9]+$/', $slug ) && $slug_num = intval( $slug ) ) {
			$permastructs   = array_values( array_filter( explode( '/', get_option( 'permalink_structure' ) ) ) );
			$postname_index = array_search( '%postname%', $permastructs );

			/*
			 * Potential date clashes are as follows:
			 *
			 * - Any integer in the first permastruct position could be a year.
			 * - An integer between 1 and 12 that follows 'year' conflicts with 'monthnum'.
			 * - An integer between 1 and 31 that follows 'monthnum' conflicts with 'day'.
			 */
			if ( 0 === $postname_index ||
				( $postname_index && '%year%' === $permastructs[ $postname_index - 1 ] && 13 > $slug_num ) ||
				( $postname_index && '%monthnum%' === $permastructs[ $postname_index - 1 ] && 32 > $slug_num )
			) {
				$conflicts_with_date_archive = true;
			}
		}

		/**
		 * Filters whether the post slug would be bad as a flat slug.
		 *
		 * @since 3.1.0
		 *
		 * @param bool   $bad_slug  Whether the post slug would be bad as a flat slug.
		 * @param string $slug      The post slug.
		 * @param string $post_type Post type.
		 */
		if ( $post_name_check || in_array( $slug, $feeds ) || 'embed' === $slug || $conflicts_with_date_archive || apply_filters( 'wp_unique_post_slug_is_bad_flat_slug', false, $slug, $post_type ) ) {
			$suffix = 2;
			do {
				$alt_post_name = _truncate_post_slug( $slug, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix";
				$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_type, $post_ID ) );
				$suffix++;
			} while ( $post_name_check );
			$slug = $alt_post_name;
		}
	}

	/**
	 * Filters the unique post slug.
	 *
	 * @since 3.3.0
	 *
	 * @param string $slug          The post slug.
	 * @param int    $post_ID       Post ID.
	 * @param string $post_status   The post status.
	 * @param string $post_type     Post type.
	 * @param int    $post_parent   Post parent ID
	 * @param string $original_slug The original post slug.
	 */
	return apply_filters( 'wp_unique_post_slug', $slug, $post_ID, $post_status, $post_type, $post_parent, $original_slug );
}

/**
 * Truncate a post slug.
 *
 * @since 3.6.0
 * @access private
 *
 * @see utf8_uri_encode()
 *
 * @param string $slug   The slug to truncate.
 * @param int    $length Optional. Max length of the slug. Default 200 (characters).
 * @return string The truncated slug.
 */
function _truncate_post_slug( $slug, $length = 200 ) {
	if ( strlen( $slug ) > $length ) {
		$decoded_slug = urldecode( $slug );
		if ( $decoded_slug === $slug )
			$slug = substr( $slug, 0, $length );
		else
			$slug = utf8_uri_encode( $decoded_slug, $length, true );
	}

	return rtrim( $slug, '-' );
}

/**
 * Add tags to a post.
 *
 * @see wp_set_post_tags()
 *
 * @since 2.3.0
 *
 * @param int          $post_id Optional. The Post ID. Does not default to the ID of the global $post.
 * @param string|array $tags    Optional. An array of tags to set for the post, or a string of tags
 *                              separated by commas. Default empty.
 * @return array|false|WP_Error Array of affected term IDs. WP_Error or false on failure.
 */
function wp_add_post_tags( $post_id = 0, $tags = '' ) {
	return wp_set_post_tags($post_id, $tags, true);
}

/**
 * Set the tags for a post.
 *
 * @since 2.3.0
 *
 * @see wp_set_object_terms()
 *
 * @param int          $post_id Optional. The Post ID. Does not default to the ID of the global $post.
 * @param string|array $tags    Optional. An array of tags to set for the post, or a string of tags
 *                              separated by commas. Default empty.
 * @param bool         $append  Optional. If true, don't delete existing tags, just add on. If false,
 *                              replace the tags with the new tags. Default false.
 * @return array|false|WP_Error Array of term taxonomy IDs of affected terms. WP_Error or false on failure.
 */
function wp_set_post_tags( $post_id = 0, $tags = '', $append = false ) {
	return wp_set_post_terms( $post_id, $tags, 'post_tag', $append);
}

/**
 * Set the terms for a post.
 *
 * @since 2.8.0
 *
 * @see wp_set_object_terms()
 *
 * @param int          $post_id  Optional. The Post ID. Does not default to the ID of the global $post.
 * @param string|array $tags     Optional. An array of terms to set for the post, or a string of terms
 *                               separated by commas. Default empty.
 * @param string       $taxonomy Optional. Taxonomy name. Default 'post_tag'.
 * @param bool         $append   Optional. If true, don't delete existing terms, just add on. If false,
 *                               replace the terms with the new terms. Default false.
 * @return array|false|WP_Error Array of term taxonomy IDs of affected terms. WP_Error or false on failure.
 */
function wp_set_post_terms( $post_id = 0, $tags = '', $taxonomy = 'post_tag', $append = false ) {
	$post_id = (int) $post_id;

	if ( !$post_id )
		return false;

	if ( empty($tags) )
		$tags = array();

	if ( ! is_array( $tags ) ) {
		$comma = _x( ',', 'tag delimiter' );
		if ( ',' !== $comma )
			$tags = str_replace( $comma, ',', $tags );
		$tags = explode( ',', trim( $tags, " \n\t\r\0\x0B," ) );
	}

	/*
	 * Hierarchical taxonomies must always pass IDs rather than names so that
	 * children with the same names but different parents aren't confused.
	 */
	if ( is_taxonomy_hierarchical( $taxonomy ) ) {
		$tags = array_unique( array_map( 'intval', $tags ) );
	}

	return wp_set_object_terms( $post_id, $tags, $taxonomy, $append );
}

/**
 * Set categories for a post.
 *
 * If the post categories parameter is not set, then the default category is
 * going used.
 *
 * @since 2.1.0
 *
 * @param int       $post_ID         Optional. The Post ID. Does not default to the ID
 *                                   of the global $post. Default 0.
 * @param array|int $post_categories Optional. List of categories or ID of category.
 *                                   Default empty array.
 * @param bool      $append         If true, don't delete existing categories, just add on.
 *                                  If false, replace the categories with the new categories.
 * @return array|false|WP_Error Array of term taxonomy IDs of affected categories. WP_Error or false on failure.
 */
function wp_set_post_categories( $post_ID = 0, $post_categories = array(), $append = false ) {
	$post_ID = (int) $post_ID;
	$post_type = get_post_type( $post_ID );
	$post_status = get_post_status( $post_ID );
	// If $post_categories isn't already an array, make it one:
	$post_categories = (array) $post_categories;
	if ( empty( $post_categories ) ) {
		if ( 'post' == $post_type && 'auto-draft' != $post_status ) {
			$post_categories = array( get_option('default_category') );
			$append = false;
		} else {
			$post_categories = array();
		}
	} elseif ( 1 == count( $post_categories ) && '' == reset( $post_categories ) ) {
		return true;
	}

	return wp_set_post_terms( $post_ID, $post_categories, 'category', $append );
}

/**
 * Fires actions related to the transitioning of a post's status.
 *
 * When a post is saved, the post status is "transitioned" from one status to another,
 * though this does not always mean the status has actually changed before and after
 * the save. This function fires a number of action hooks related to that transition:
 * the generic {@see 'transition_post_status'} action, as well as the dynamic hooks
 * {@see '$old_status_to_$new_status'} and {@see '$new_status_$post->post_type'}. Note
 * that the function does not transition the post object in the database.
 *
 * For instance: When publishing a post for the first time, the post status may transition
 * from 'draft' – or some other status – to 'publish'. However, if a post is already
 * published and is simply being updated, the "old" and "new" statuses may both be 'publish'
 * before and after the transition.
 *
 * @since 2.3.0
 *
 * @param string  $new_status Transition to this post status.
 * @param string  $old_status Previous post status.
 * @param WP_Post $post Post data.
 */
function wp_transition_post_status( $new_status, $old_status, $post ) {
	/**
	 * Fires when a post is transitioned from one status to another.
	 *
	 * @since 2.3.0
	 *
	 * @param string  $new_status New post status.
	 * @param string  $old_status Old post status.
	 * @param WP_Post $post       Post object.
	 */
	do_action( 'transition_post_status', $new_status, $old_status, $post );

	/**
	 * Fires when a post is transitioned from one status to another.
	 *
	 * The dynamic portions of the hook name, `$new_status` and `$old status`,
	 * refer to the old and new post statuses, respectively.
	 *
	 * @since 2.3.0
	 *
	 * @param WP_Post $post Post object.
	 */
	do_action( "{$old_status}_to_{$new_status}", $post );

	/**
	 * Fires when a post is transitioned from one status to another.
	 *
	 * The dynamic portions of the hook name, `$new_status` and `$post->post_type`,
	 * refer to the new post status and post type, respectively.
	 *
	 * Please note: When this action is hooked using a particular post status (like
	 * 'publish', as `publish_{$post->post_type}`), it will fire both when a post is
	 * first transitioned to that status from something else, as well as upon
	 * subsequent post updates (old and new status are both the same).
	 *
	 * Therefore, if you are looking to only fire a callback when a post is first
	 * transitioned to a status, use the {@see 'transition_post_status'} hook instead.
	 *
	 * @since 2.3.0
	 *
	 * @param int     $post_id Post ID.
	 * @param WP_Post $post    Post object.
	 */
	do_action( "{$new_status}_{$post->post_type}", $post->ID, $post );
}

//
// Comment, trackback, and pingback functions.
//

/**
 * Add a URL to those already pinged.
 *
 * @since 1.5.0
 * @since 4.7.0 $post_id can be a WP_Post object.
 * @since 4.7.0 $uri can be an array of URIs.
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int|WP_Post  $post_id Post object or ID.
 * @param string|array $uri     Ping URI or array of URIs.
 * @return int|false How many rows were updated.
 */
function add_ping( $post_id, $uri ) {
	global $wpdb;

	$post = get_post( $post_id );
	if ( ! $post ) {
		return false;
	}

	$pung = trim( $post->pinged );
	$pung = preg_split( '/\s/', $pung );

	if ( is_array( $uri ) ) {
		$pung = array_merge( $pung, $uri );
	}
	else {
		$pung[] = $uri;
	}
	$new = implode("\n", $pung);

	/**
	 * Filters the new ping URL to add for the given post.
	 *
	 * @since 2.0.0
	 *
	 * @param string $new New ping URL to add.
	 */
	$new = apply_filters( 'add_ping', $new );

	$return = $wpdb->update( $wpdb->posts, array( 'pinged' => $new ), array( 'ID' => $post->ID ) );
	clean_post_cache( $post->ID );
	return $return;
}

/**
 * Retrieve enclosures already enclosed for a post.
 *
 * @since 1.5.0
 *
 * @param int $post_id Post ID.
 * @return array List of enclosures.
 */
function get_enclosed( $post_id ) {
	$custom_fields = get_post_custom( $post_id );
	$pung = array();
	if ( !is_array( $custom_fields ) )
		return $pung;

	foreach ( $custom_fields as $key => $val ) {
		if ( 'enclosure' != $key || !is_array( $val ) )
			continue;
		foreach ( $val as $enc ) {
			$enclosure = explode( "\n", $enc );
			$pung[] = trim( $enclosure[ 0 ] );
		}
	}

	/**
	 * Filters the list of enclosures already enclosed for the given post.
	 *
	 * @since 2.0.0
	 *
	 * @param array $pung    Array of enclosures for the given post.
	 * @param int   $post_id Post ID.
	 */
	return apply_filters( 'get_enclosed', $pung, $post_id );
}

/**
 * Retrieve URLs already pinged for a post.
 *
 * @since 1.5.0
 *
 * @since 4.7.0 $post_id can be a WP_Post object.
 *
 * @param int|WP_Post $post_id Post ID or object.
 * @return array
 */
function get_pung( $post_id ) {
	$post = get_post( $post_id );
	if ( ! $post ) {
		return false;
	}

	$pung = trim( $post->pinged );
	$pung = preg_split( '/\s/', $pung );

	/**
	 * Filters the list of already-pinged URLs for the given post.
	 *
	 * @since 2.0.0
	 *
	 * @param array $pung Array of URLs already pinged for the given post.
	 */
	return apply_filters( 'get_pung', $pung );
}

/**
 * Retrieve URLs that need to be pinged.
 *
 * @since 1.5.0
 * @since 4.7.0 $post_id can be a WP_Post object.
 *
 * @param int|WP_Post $post_id Post Object or ID
 * @return array
 */
function get_to_ping( $post_id ) {
	$post = get_post( $post_id );

	if ( ! $post ) {
		return false;
	}

	$to_ping = sanitize_trackback_urls( $post->to_ping );
	$to_ping = preg_split('/\s/', $to_ping, -1, PREG_SPLIT_NO_EMPTY);

	/**
	 * Filters the list of URLs yet to ping for the given post.
	 *
	 * @since 2.0.0
	 *
	 * @param array $to_ping List of URLs yet to ping.
	 */
	return apply_filters( 'get_to_ping', $to_ping );
}

/**
 * Do trackbacks for a list of URLs.
 *
 * @since 1.0.0
 *
 * @param string $tb_list Comma separated list of URLs.
 * @param int    $post_id Post ID.
 */
function trackback_url_list( $tb_list, $post_id ) {
	if ( ! empty( $tb_list ) ) {
		// Get post data.
		$postdata = get_post( $post_id, ARRAY_A );

		// Form an excerpt.
		$excerpt = strip_tags( $postdata['post_excerpt'] ? $postdata['post_excerpt'] : $postdata['post_content'] );

		if ( strlen( $excerpt ) > 255 ) {
			$excerpt = substr( $excerpt, 0, 252 ) . '&hellip;';
		}

		$trackback_urls = explode( ',', $tb_list );
		foreach ( (array) $trackback_urls as $tb_url ) {
			$tb_url = trim( $tb_url );
			trackback( $tb_url, wp_unslash( $postdata['post_title'] ), $excerpt, $post_id );
		}
	}
}

//
// Page functions
//

/**
 * Get a list of page IDs.
 *
 * @since 2.0.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @return array List of page IDs.
 */
function get_all_page_ids() {
	global $wpdb;

	$page_ids = wp_cache_get('all_page_ids', 'posts');
	if ( ! is_array( $page_ids ) ) {
		$page_ids = $wpdb->get_col("SELECT ID FROM $wpdb->posts WHERE post_type = 'page'");
		wp_cache_add('all_page_ids', $page_ids, 'posts');
	}

	return $page_ids;
}

/**
 * Retrieves page data given a page ID or page object.
 *
 * Use get_post() instead of get_page().
 *
 * @since 1.5.1
 * @deprecated 3.5.0 Use get_post()
 *
 * @param mixed  $page   Page object or page ID. Passed by reference.
 * @param string $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
 *                       a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
 * @param string $filter Optional. How the return value should be filtered. Accepts 'raw',
 *                       'edit', 'db', 'display'. Default 'raw'.
 * @return WP_Post|array|null WP_Post (or array) on success, or null on failure.
 */
function get_page( $page, $output = OBJECT, $filter = 'raw') {
	return get_post( $page, $output, $filter );
}

/**
 * Retrieves a page given its path.
 *
 * @since 2.1.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string       $page_path Page path.
 * @param string       $output    Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
 *                                a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
 * @param string|array $post_type Optional. Post type or array of post types. Default 'page'.
 * @return WP_Post|array|null WP_Post (or array) on success, or null on failure.
 */
function get_page_by_path( $page_path, $output = OBJECT, $post_type = 'page' ) {
	global $wpdb;

	$last_changed = wp_cache_get_last_changed( 'posts' );

	$hash = md5( $page_path . serialize( $post_type ) );
	$cache_key = "get_page_by_path:$hash:$last_changed";
	$cached = wp_cache_get( $cache_key, 'posts' );
	if ( false !== $cached ) {
		// Special case: '0' is a bad `$page_path`.
		if ( '0' === $cached || 0 === $cached ) {
			return;
		} else {
			return get_post( $cached, $output );
		}
	}

	$page_path = rawurlencode(urldecode($page_path));
	$page_path = str_replace('%2F', '/', $page_path);
	$page_path = str_replace('%20', ' ', $page_path);
	$parts = explode( '/', trim( $page_path, '/' ) );
	$parts = array_map( 'sanitize_title_for_query', $parts );
	$escaped_parts = esc_sql( $parts );

	$in_string = "'" . implode( "','", $escaped_parts ) . "'";

	if ( is_array( $post_type ) ) {
		$post_types = $post_type;
	} else {
		$post_types = array( $post_type, 'attachment' );
	}

	$post_types = esc_sql( $post_types );
	$post_type_in_string = "'" . implode( "','", $post_types ) . "'";
	$sql = "
		SELECT ID, post_name, post_parent, post_type
		FROM $wpdb->posts
		WHERE post_name IN ($in_string)
		AND post_type IN ($post_type_in_string)
	";

	$pages = $wpdb->get_results( $sql, OBJECT_K );

	$revparts = array_reverse( $parts );

	$foundid = 0;
	foreach ( (array) $pages as $page ) {
		if ( $page->post_name == $revparts[0] ) {
			$count = 0;
			$p = $page;

			/*
			 * Loop through the given path parts from right to left,
			 * ensuring each matches the post ancestry.
			 */
			while ( $p->post_parent != 0 && isset( $pages[ $p->post_parent ] ) ) {
				$count++;
				$parent = $pages[ $p->post_parent ];
				if ( ! isset( $revparts[ $count ] ) || $parent->post_name != $revparts[ $count ] )
					break;
				$p = $parent;
			}

			if ( $p->post_parent == 0 && $count+1 == count( $revparts ) && $p->post_name == $revparts[ $count ] ) {
				$foundid = $page->ID;
				if ( $page->post_type == $post_type )
					break;
			}
		}
	}

	// We cache misses as well as hits.
	wp_cache_set( $cache_key, $foundid, 'posts' );

	if ( $foundid ) {
		return get_post( $foundid, $output );
	}
}

/**
 * Retrieve a page given its title.
 *
 * @since 2.1.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string       $page_title Page title
 * @param string       $output     Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
 *                                 a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
 * @param string|array $post_type  Optional. Post type or array of post types. Default 'page'.
 * @return WP_Post|array|null WP_Post (or array) on success, or null on failure.
 */
function get_page_by_title( $page_title, $output = OBJECT, $post_type = 'page' ) {
	global $wpdb;

	if ( is_array( $post_type ) ) {
		$post_type = esc_sql( $post_type );
		$post_type_in_string = "'" . implode( "','", $post_type ) . "'";
		$sql = $wpdb->prepare( "
			SELECT ID
			FROM $wpdb->posts
			WHERE post_title = %s
			AND post_type IN ($post_type_in_string)
		", $page_title );
	} else {
		$sql = $wpdb->prepare( "
			SELECT ID
			FROM $wpdb->posts
			WHERE post_title = %s
			AND post_type = %s
		", $page_title, $post_type );
	}

	$page = $wpdb->get_var( $sql );

	if ( $page ) {
		return get_post( $page, $output );
	}
}

/**
 * Identify descendants of a given page ID in a list of page objects.
 *
 * Descendants are identified from the `$pages` array passed to the function. No database queries are performed.
 *
 * @since 1.5.1
 *
 * @param int   $page_id Page ID.
 * @param array $pages   List of page objects from which descendants should be identified.
 * @return array List of page children.
 */
function get_page_children( $page_id, $pages ) {
	// Build a hash of ID -> children.
	$children = array();
	foreach ( (array) $pages as $page ) {
		$children[ intval( $page->post_parent ) ][] = $page;
	}

	$page_list = array();

	// Start the search by looking at immediate children.
	if ( isset( $children[ $page_id ] ) ) {
		// Always start at the end of the stack in order to preserve original `$pages` order.
		$to_look = array_reverse( $children[ $page_id ] );

		while ( $to_look ) {
			$p = array_pop( $to_look );
			$page_list[] = $p;
			if ( isset( $children[ $p->ID ] ) ) {
				foreach ( array_reverse( $children[ $p->ID ] ) as $child ) {
					// Append to the `$to_look` stack to descend the tree.
					$to_look[] = $child;
				}
			}
		}
	}

	return $page_list;
}

/**
 * Order the pages with children under parents in a flat list.
 *
 * It uses auxiliary structure to hold parent-children relationships and
 * runs in O(N) complexity
 *
 * @since 2.0.0
 *
 * @param array $pages   Posts array (passed by reference).
 * @param int   $page_id Optional. Parent page ID. Default 0.
 * @return array A list arranged by hierarchy. Children immediately follow their parents.
 */
function get_page_hierarchy( &$pages, $page_id = 0 ) {
	if ( empty( $pages ) ) {
		return array();
	}

	$children = array();
	foreach ( (array) $pages as $p ) {
		$parent_id = intval( $p->post_parent );
		$children[ $parent_id ][] = $p;
	}

	$result = array();
	_page_traverse_name( $page_id, $children, $result );

	return $result;
}

/**
 * Traverse and return all the nested children post names of a root page.
 *
 * $children contains parent-children relations
 *
 * @since 2.9.0
 *
 * @see _page_traverse_name()
 *
 * @param int   $page_id   Page ID.
 * @param array $children  Parent-children relations (passed by reference).
 * @param array $result    Result (passed by reference).
 */
function _page_traverse_name( $page_id, &$children, &$result ){
	if ( isset( $children[ $page_id ] ) ){
		foreach ( (array)$children[ $page_id ] as $child ) {
			$result[ $child->ID ] = $child->post_name;
			_page_traverse_name( $child->ID, $children, $result );
		}
	}
}

/**
 * Build the URI path for a page.
 *
 * Sub pages will be in the "directory" under the parent page post name.
 *
 * @since 1.5.0
 * @since 4.6.0 Converted the `$page` parameter to optional.
 *
 * @param WP_Post|object|int $page Optional. Page ID or WP_Post object. Default is global $post.
 * @return string|false Page URI, false on error.
 */
function get_page_uri( $page = 0 ) {
	if ( ! $page instanceof WP_Post ) {
		$page = get_post( $page );
	}

	if ( ! $page )
		return false;

	$uri = $page->post_name;

	foreach ( $page->ancestors as $parent ) {
		$parent = get_post( $parent );
		if ( $parent && $parent->post_name ) {
			$uri = $parent->post_name . '/' . $uri;
		}
	}

	/**
	 * Filters the URI for a page.
	 *
	 * @since 4.4.0
	 *
	 * @param string  $uri  Page URI.
	 * @param WP_Post $page Page object.
	 */
	return apply_filters( 'get_page_uri', $uri, $page );
}

/**
 * Retrieve a list of pages (or hierarchical post type items).
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @since 1.5.0
 *
 * @param array|string $args {
 *     Optional. Array or string of arguments to retrieve pages.
 *
 *     @type int          $child_of     Page ID to return child and grandchild pages of. Note: The value
 *                                      of `$hierarchical` has no bearing on whether `$child_of` returns
 *                                      hierarchical results. Default 0, or no restriction.
 *     @type string       $sort_order   How to sort retrieved pages. Accepts 'ASC', 'DESC'. Default 'ASC'.
 *     @type string       $sort_column  What columns to sort pages by, comma-separated. Accepts 'post_author',
 *                                      'post_date', 'post_title', 'post_name', 'post_modified', 'menu_order',
 *                                      'post_modified_gmt', 'post_parent', 'ID', 'rand', 'comment_count'.
 *                                      'post_' can be omitted for any values that start with it.
 *                                      Default 'post_title'.
 *     @type bool         $hierarchical Whether to return pages hierarchically. If false in conjunction with
 *                                      `$child_of` also being false, both arguments will be disregarded.
 *                                      Default true.
 *     @type array        $exclude      Array of page IDs to exclude. Default empty array.
 *     @type array        $include      Array of page IDs to include. Cannot be used with `$child_of`,
 *                                      `$parent`, `$exclude`, `$meta_key`, `$meta_value`, or `$hierarchical`.
 *                                      Default empty array.
 *     @type string       $meta_key     Only include pages with this meta key. Default empty.
 *     @type string       $meta_value   Only include pages with this meta value. Requires `$meta_key`.
 *                                      Default empty.
 *     @type string       $authors      A comma-separated list of author IDs. Default empty.
 *     @type int          $parent       Page ID to return direct children of. Default -1, or no restriction.
 *     @type string|array $exclude_tree Comma-separated string or array of page IDs to exclude.
 *                                      Default empty array.
 *     @type int          $number       The number of pages to return. Default 0, or all pages.
 *     @type int          $offset       The number of pages to skip before returning. Requires `$number`.
 *                                      Default 0.
 *     @type string       $post_type    The post type to query. Default 'page'.
 *     @type string|array $post_status  A comma-separated list or array of post statuses to include.
 *                                      Default 'publish'.
 * }
 * @return array|false List of pages matching defaults or `$args`.
 */
function get_pages( $args = array() ) {
	global $wpdb;

	$defaults = array(
		'child_of'     => 0,
		'sort_order'   => 'ASC',
		'sort_column'  => 'post_title',
		'hierarchical' => 1,
		'exclude'      => array(),
		'include'      => array(),
		'meta_key'     => '',
		'meta_value'   => '',
		'authors'      => '',
		'parent'       => -1,
		'exclude_tree' => array(),
		'number'       => '',
		'offset'       => 0,
		'post_type'    => 'page',
		'post_status'  => 'publish',
	);

	$r = wp_parse_args( $args, $defaults );

	$number = (int) $r['number'];
	$offset = (int) $r['offset'];
	$child_of = (int) $r['child_of'];
	$hierarchical = $r['hierarchical'];
	$exclude = $r['exclude'];
	$meta_key = $r['meta_key'];
	$meta_value = $r['meta_value'];
	$parent = $r['parent'];
	$post_status = $r['post_status'];

	// Make sure the post type is hierarchical.
	$hierarchical_post_types = get_post_types( array( 'hierarchical' => true ) );
	if ( ! in_array( $r['post_type'], $hierarchical_post_types ) ) {
		return false;
	}

	if ( $parent > 0 && ! $child_of ) {
		$hierarchical = false;
	}

	// Make sure we have a valid post status.
	if ( ! is_array( $post_status ) ) {
		$post_status = explode( ',', $post_status );
	}
	if ( array_diff( $post_status, get_post_stati() ) ) {
		return false;
	}

	// $args can be whatever, only use the args defined in defaults to compute the key.
	$key = md5( serialize( wp_array_slice_assoc( $r, array_keys( $defaults ) ) ) );
	$last_changed = wp_cache_get_last_changed( 'posts' );

	$cache_key = "get_pages:$key:$last_changed";
	if ( $cache = wp_cache_get( $cache_key, 'posts' ) ) {
		// Convert to WP_Post instances.
		$pages = array_map( 'get_post', $cache );
		/** This filter is documented in wp-includes/post.php */
		$pages = apply_filters( 'get_pages', $pages, $r );
		return $pages;
	}

	$inclusions = '';
	if ( ! empty( $r['include'] ) ) {
		$child_of = 0; //ignore child_of, parent, exclude, meta_key, and meta_value params if using include
		$parent = -1;
		$exclude = '';
		$meta_key = '';
		$meta_value = '';
		$hierarchical = false;
		$incpages = wp_parse_id_list( $r['include'] );
		if ( ! empty( $incpages ) ) {
			$inclusions = ' AND ID IN (' . implode( ',', $incpages ) .  ')';
		}
	}

	$exclusions = '';
	if ( ! empty( $exclude ) ) {
		$expages = wp_parse_id_list( $exclude );
		if ( ! empty( $expages ) ) {
			$exclusions = ' AND ID NOT IN (' . implode( ',', $expages ) .  ')';
		}
	}

	$author_query = '';
	if ( ! empty( $r['authors'] ) ) {
		$post_authors = preg_split( '/[\s,]+/', $r['authors'] );

		if ( ! empty( $post_authors ) ) {
			foreach ( $post_authors as $post_author ) {
				//Do we have an author id or an author login?
				if ( 0 == intval($post_author) ) {
					$post_author = get_user_by('login', $post_author);
					if ( empty( $post_author ) ) {
						continue;
					}
					if ( empty( $post_author->ID ) ) {
						continue;
					}
					$post_author = $post_author->ID;
				}

				if ( '' == $author_query ) {
					$author_query = $wpdb->prepare(' post_author = %d ', $post_author);
				} else {
					$author_query .= $wpdb->prepare(' OR post_author = %d ', $post_author);
				}
			}
			if ( '' != $author_query ) {
				$author_query = " AND ($author_query)";
			}
		}
	}

	$join = '';
	$where = "$exclusions $inclusions ";
	if ( '' !== $meta_key || '' !== $meta_value ) {
		$join = " LEFT JOIN $wpdb->postmeta ON ( $wpdb->posts.ID = $wpdb->postmeta.post_id )";

		// meta_key and meta_value might be slashed
		$meta_key = wp_unslash($meta_key);
		$meta_value = wp_unslash($meta_value);
		if ( '' !== $meta_key ) {
			$where .= $wpdb->prepare(" AND $wpdb->postmeta.meta_key = %s", $meta_key);
		}
		if ( '' !== $meta_value ) {
			$where .= $wpdb->prepare(" AND $wpdb->postmeta.meta_value = %s", $meta_value);
		}

	}

	if ( is_array( $parent ) ) {
		$post_parent__in = implode( ',', array_map( 'absint', (array) $parent ) );
		if ( ! empty( $post_parent__in ) ) {
			$where .= " AND post_parent IN ($post_parent__in)";
		}
	} elseif ( $parent >= 0 ) {
		$where .= $wpdb->prepare(' AND post_parent = %d ', $parent);
	}

	if ( 1 == count( $post_status ) ) {
		$where_post_type = $wpdb->prepare( "post_type = %s AND post_status = %s", $r['post_type'], reset( $post_status ) );
	} else {
		$post_status = implode( "', '", $post_status );
		$where_post_type = $wpdb->prepare( "post_type = %s AND post_status IN ('$post_status')", $r['post_type'] );
	}

	$orderby_array = array();
	$allowed_keys = array( 'author', 'post_author', 'date', 'post_date', 'title', 'post_title', 'name', 'post_name', 'modified',
		'post_modified', 'modified_gmt', 'post_modified_gmt', 'menu_order', 'parent', 'post_parent',
		'ID', 'rand', 'comment_count' );

	foreach ( explode( ',', $r['sort_column'] ) as $orderby ) {
		$orderby = trim( $orderby );
		if ( ! in_array( $orderby, $allowed_keys ) ) {
			continue;
		}

		switch ( $orderby ) {
			case 'menu_order':
				break;
			case 'ID':
				$orderby = "$wpdb->posts.ID";
				break;
			case 'rand':
				$orderby = 'RAND()';
				break;
			case 'comment_count':
				$orderby = "$wpdb->posts.comment_count";
				break;
			default:
				if ( 0 === strpos( $orderby, 'post_' ) ) {
					$orderby = "$wpdb->posts." . $orderby;
				} else {
					$orderby = "$wpdb->posts.post_" . $orderby;
				}
		}

		$orderby_array[] = $orderby;

	}
	$sort_column = ! empty( $orderby_array ) ? implode( ',', $orderby_array ) : "$wpdb->posts.post_title";

	$sort_order = strtoupper( $r['sort_order'] );
	if ( '' !== $sort_order && ! in_array( $sort_order, array( 'ASC', 'DESC' ) ) ) {
		$sort_order = 'ASC';
	}

	$query = "SELECT * FROM $wpdb->posts $join WHERE ($where_post_type) $where ";
	$query .= $author_query;
	$query .= " ORDER BY " . $sort_column . " " . $sort_order ;

	if ( ! empty( $number ) ) {
		$query .= ' LIMIT ' . $offset . ',' . $number;
	}

	$pages = $wpdb->get_results($query);

	if ( empty($pages) ) {
		/** This filter is documented in wp-includes/post.php */
		$pages = apply_filters( 'get_pages', array(), $r );
		return $pages;
	}

	// Sanitize before caching so it'll only get done once.
	$num_pages = count($pages);
	for ($i = 0; $i < $num_pages; $i++) {
		$pages[$i] = sanitize_post($pages[$i], 'raw');
	}

	// Update cache.
	update_post_cache( $pages );

	if ( $child_of || $hierarchical ) {
		$pages = get_page_children($child_of, $pages);
	}

	if ( ! empty( $r['exclude_tree'] ) ) {
		$exclude = wp_parse_id_list( $r['exclude_tree'] );
		foreach ( $exclude as $id ) {
			$children = get_page_children( $id, $pages );
			foreach ( $children as $child ) {
				$exclude[] = $child->ID;
			}
		}

		$num_pages = count( $pages );
		for ( $i = 0; $i < $num_pages; $i++ ) {
			if ( in_array( $pages[$i]->ID, $exclude ) ) {
				unset( $pages[$i] );
			}
		}
	}

	$page_structure = array();
	foreach ( $pages as $page ) {
		$page_structure[] = $page->ID;
	}

	wp_cache_set( $cache_key, $page_structure, 'posts' );

	// Convert to WP_Post instances
	$pages = array_map( 'get_post', $pages );

	/**
	 * Filters the retrieved list of pages.
	 *
	 * @since 2.1.0
	 *
	 * @param array $pages List of pages to retrieve.
	 * @param array $r     Array of get_pages() arguments.
	 */
	return apply_filters( 'get_pages', $pages, $r );
}

//
// Attachment functions
//

/**
 * Determines whether an attachment URI is local and really an attachment.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 2.0.0
 *
 * @param string $url URL to check
 * @return bool True on success, false on failure.
 */
function is_local_attachment($url) {
	if (strpos($url, home_url()) === false)
		return false;
	if (strpos($url, home_url('/?attachment_id=')) !== false)
		return true;
	if ( $id = url_to_postid($url) ) {
		$post = get_post($id);
		if ( 'attachment' == $post->post_type )
			return true;
	}
	return false;
}

/**
 * Insert an attachment.
 *
 * If you set the 'ID' in the $args parameter, it will mean that you are
 * updating and attempt to update the attachment. You can also set the
 * attachment name or title by setting the key 'post_name' or 'post_title'.
 *
 * You can set the dates for the attachment manually by setting the 'post_date'
 * and 'post_date_gmt' keys' values.
 *
 * By default, the comments will use the default settings for whether the
 * comments are allowed. You can close them manually or keep them open by
 * setting the value for the 'comment_status' key.
 *
 * @since 2.0.0
 * @since 4.7.0 Added the `$wp_error` parameter to allow a WP_Error to be returned on failure.
 *
 * @see wp_insert_post()
 *
 * @param string|array $args     Arguments for inserting an attachment.
 * @param string       $file     Optional. Filename.
 * @param int          $parent   Optional. Parent post ID.
 * @param bool         $wp_error Optional. Whether to return a WP_Error on failure. Default false.
 * @return int|WP_Error The attachment ID on success. The value 0 or WP_Error on failure.
 */
function wp_insert_attachment( $args, $file = false, $parent = 0, $wp_error = false ) {
	$defaults = array(
		'file'        => $file,
		'post_parent' => 0
	);

	$data = wp_parse_args( $args, $defaults );

	if ( ! empty( $parent ) ) {
		$data['post_parent'] = $parent;
	}

	$data['post_type'] = 'attachment';

	return wp_insert_post( $data, $wp_error );
}

/**
 * Trash or delete an attachment.
 *
 * When an attachment is permanently deleted, the file will also be removed.
 * Deletion removes all post meta fields, taxonomy, comments, etc. associated
 * with the attachment (except the main post).
 *
 * The attachment is moved to the trash instead of permanently deleted unless trash
 * for media is disabled, item is already in the trash, or $force_delete is true.
 *
 * @since 2.0.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int  $post_id      Attachment ID.
 * @param bool $force_delete Optional. Whether to bypass trash and force deletion.
 *                           Default false.
 * @return WP_Post|false|null Post data on success, false or null on failure.
 */
function wp_delete_attachment( $post_id, $force_delete = false ) {
	global $wpdb;

	$post = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->posts WHERE ID = %d", $post_id ) );

	if ( ! $post ) {
		return $post;
	}

	$post = get_post( $post );

	if ( 'attachment' !== $post->post_type ) {
		return false;
	}

	if ( ! $force_delete && EMPTY_TRASH_DAYS && MEDIA_TRASH && 'trash' !== $post->post_status ) {
		return wp_trash_post( $post_id );
	}

	delete_post_meta($post_id, '_wp_trash_meta_status');
	delete_post_meta($post_id, '_wp_trash_meta_time');

	$meta = wp_get_attachment_metadata( $post_id );
	$backup_sizes = get_post_meta( $post->ID, '_wp_attachment_backup_sizes', true );
	$file = get_attached_file( $post_id );

	if ( is_multisite() )
		delete_transient( 'dirsize_cache' );

	/**
	 * Fires before an attachment is deleted, at the start of wp_delete_attachment().
	 *
	 * @since 2.0.0
	 *
	 * @param int $post_id Attachment ID.
	 */
	do_action( 'delete_attachment', $post_id );

	wp_delete_object_term_relationships($post_id, array('category', 'post_tag'));
	wp_delete_object_term_relationships($post_id, get_object_taxonomies($post->post_type));

	// Delete all for any posts.
	delete_metadata( 'post', null, '_thumbnail_id', $post_id, true );

	wp_defer_comment_counting( true );

	$comment_ids = $wpdb->get_col( $wpdb->prepare( "SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = %d", $post_id ));
	foreach ( $comment_ids as $comment_id ) {
		wp_delete_comment( $comment_id, true );
	}

	wp_defer_comment_counting( false );

	$post_meta_ids = $wpdb->get_col( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE post_id = %d ", $post_id ));
	foreach ( $post_meta_ids as $mid )
		delete_metadata_by_mid( 'post', $mid );

	/** This action is documented in wp-includes/post.php */
	do_action( 'delete_post', $post_id );
	$result = $wpdb->delete( $wpdb->posts, array( 'ID' => $post_id ) );
	if ( ! $result ) {
		return false;
	}
	/** This action is documented in wp-includes/post.php */
	do_action( 'deleted_post', $post_id );

	wp_delete_attachment_files( $post_id, $meta, $backup_sizes, $file );

	clean_post_cache( $post );

	return $post;
}

/**
 * Deletes all files that belong to the given attachment.
 *
 * @since 4.9.7
 *
 * @param int    $post_id      Attachment ID.
 * @param array  $meta         The attachment's meta data.
 * @param array  $backup_sizes The meta data for the attachment's backup images.
 * @param string $file         Absolute path to the attachment's file.
 * @return bool True on success, false on failure.
 */
function wp_delete_attachment_files( $post_id, $meta, $backup_sizes, $file ) {
	global $wpdb;

	$uploadpath = wp_get_upload_dir();
	$deleted    = true;

	if ( ! empty( $meta['thumb'] ) ) {
		// Don't delete the thumb if another attachment uses it.
		if ( ! $wpdb->get_row( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE meta_key = '_wp_attachment_metadata' AND meta_value LIKE %s AND post_id <> %d", '%' . $wpdb->esc_like( $meta['thumb'] ) . '%', $post_id ) ) ) {
			$thumbfile = str_replace( basename( $file ), $meta['thumb'], $file );
			if ( ! empty( $thumbfile ) ) {
				$thumbfile = path_join( $uploadpath['basedir'], $thumbfile );
				$thumbdir  = path_join( $uploadpath['basedir'], dirname( $file ) );

				if ( ! wp_delete_file_from_directory( $thumbfile, $thumbdir ) ) {
					$deleted = false;
				}
			}
		}
	}

	// Remove intermediate and backup images if there are any.
	if ( isset( $meta['sizes'] ) && is_array( $meta['sizes'] ) ) {
		$intermediate_dir = path_join( $uploadpath['basedir'], dirname( $file ) );
		foreach ( $meta['sizes'] as $size => $sizeinfo ) {
			$intermediate_file = str_replace( basename( $file ), $sizeinfo['file'], $file );
			if ( ! empty( $intermediate_file ) ) {
				$intermediate_file = path_join( $uploadpath['basedir'], $intermediate_file );

				if ( ! wp_delete_file_from_directory( $intermediate_file, $intermediate_dir ) ) {
					$deleted = false;
				}
			}
		}
	}

	if ( is_array( $backup_sizes ) ) {
		$del_dir = path_join( $uploadpath['basedir'], dirname( $meta['file'] ) );
		foreach ( $backup_sizes as $size ) {
			$del_file = path_join( dirname( $meta['file'] ), $size['file'] );
			if ( ! empty( $del_file ) ) {
				$del_file = path_join( $uploadpath['basedir'], $del_file );

				if ( ! wp_delete_file_from_directory( $del_file, $del_dir ) ) {
					$deleted = false;
				}
			}
		}
	}

	if ( ! wp_delete_file_from_directory( $file, $uploadpath['basedir'] ) ) {
		$deleted = false;
	}

	return $deleted;
}

/**
 * Retrieve attachment meta field for attachment ID.
 *
 * @since 2.1.0
 *
 * @param int  $attachment_id Attachment post ID. Defaults to global $post.
 * @param bool $unfiltered    Optional. If true, filters are not run. Default false.
 * @return mixed Attachment meta field. False on failure.
 */
function wp_get_attachment_metadata( $attachment_id = 0, $unfiltered = false ) {
	$attachment_id = (int) $attachment_id;
	if ( ! $post = get_post( $attachment_id ) ) {
		return false;
	}

	$data = get_post_meta( $post->ID, '_wp_attachment_metadata', true );

	if ( $unfiltered )
		return $data;

	/**
	 * Filters the attachment meta data.
	 *
	 * @since 2.1.0
	 *
	 * @param array|bool $data          Array of meta data for the given attachment, or false
	 *                                  if the object does not exist.
	 * @param int        $attachment_id Attachment post ID.
	 */
	return apply_filters( 'wp_get_attachment_metadata', $data, $post->ID );
}

/**
 * Update metadata for an attachment.
 *
 * @since 2.1.0
 *
 * @param int   $attachment_id Attachment post ID.
 * @param array $data          Attachment meta data.
 * @return int|bool False if $post is invalid.
 */
function wp_update_attachment_metadata( $attachment_id, $data ) {
	$attachment_id = (int) $attachment_id;
	if ( ! $post = get_post( $attachment_id ) ) {
		return false;
	}

	/**
	 * Filters the updated attachment meta data.
	 *
	 * @since 2.1.0
	 *
	 * @param array $data          Array of updated attachment meta data.
	 * @param int   $attachment_id Attachment post ID.
	 */
	if ( $data = apply_filters( 'wp_update_attachment_metadata', $data, $post->ID ) )
		return update_post_meta( $post->ID, '_wp_attachment_metadata', $data );
	else
		return delete_post_meta( $post->ID, '_wp_attachment_metadata' );
}

/**
 * Retrieve the URL for an attachment.
 *
 * @since 2.1.0
 *
 * @global string $pagenow
 *
 * @param int $attachment_id Optional. Attachment post ID. Defaults to global $post.
 * @return string|false Attachment URL, otherwise false.
 */
function wp_get_attachment_url( $attachment_id = 0 ) {
	$attachment_id = (int) $attachment_id;
	if ( ! $post = get_post( $attachment_id ) ) {
		return false;
	}

	if ( 'attachment' != $post->post_type )
		return false;

	$url = '';
	// Get attached file.
	if ( $file = get_post_meta( $post->ID, '_wp_attached_file', true ) ) {
		// Get upload directory.
		if ( ( $uploads = wp_get_upload_dir() ) && false === $uploads['error'] ) {
			// Check that the upload base exists in the file location.
			if ( 0 === strpos( $file, $uploads['basedir'] ) ) {
				// Replace file location with url location.
				$url = str_replace($uploads['basedir'], $uploads['baseurl'], $file);
			} elseif ( false !== strpos($file, 'wp-content/uploads') ) {
				// Get the directory name relative to the basedir (back compat for pre-2.7 uploads)
				$url = trailingslashit( $uploads['baseurl'] . '/' . _wp_get_attachment_relative_path( $file ) ) . basename( $file );
			} else {
				// It's a newly-uploaded file, therefore $file is relative to the basedir.
				$url = $uploads['baseurl'] . "/$file";
			}
		}
	}

	/*
	 * If any of the above options failed, Fallback on the GUID as used pre-2.7,
	 * not recommended to rely upon this.
	 */
	if ( empty($url) ) {
		$url = get_the_guid( $post->ID );
	}

	// On SSL front end, URLs should be HTTPS.
	if ( is_ssl() && ! is_admin() && 'wp-login.php' !== $GLOBALS['pagenow'] ) {
		$url = set_url_scheme( $url );
	}

	/**
	 * Filters the attachment URL.
	 *
	 * @since 2.1.0
	 *
	 * @param string $url           URL for the given attachment.
	 * @param int    $attachment_id Attachment post ID.
	 */
	$url = apply_filters( 'wp_get_attachment_url', $url, $post->ID );

	if ( empty( $url ) )
		return false;

	return $url;
}

/**
 * Retrieves the caption for an attachment.
 *
 * @since 4.6.0
 *
 * @param int $post_id Optional. Attachment ID. Default is the ID of the global `$post`.
 * @return string|false False on failure. Attachment caption on success.
 */
function wp_get_attachment_caption( $post_id = 0 ) {
	$post_id = (int) $post_id;
	if ( ! $post = get_post( $post_id ) ) {
		return false;
	}

	if ( 'attachment' !== $post->post_type ) {
		return false;
	}

	$caption = $post->post_excerpt;

	/**
	 * Filters the attachment caption.
	 *
	 * @since 4.6.0
	 *
	 * @param string $caption Caption for the given attachment.
	 * @param int    $post_id Attachment ID.
	 */
	return apply_filters( 'wp_get_attachment_caption', $caption, $post->ID );
}

/**
 * Retrieve thumbnail for an attachment.
 *
 * @since 2.1.0
 *
 * @param int $post_id Optional. Attachment ID. Default 0.
 * @return string|false False on failure. Thumbnail file path on success.
 */
function wp_get_attachment_thumb_file( $post_id = 0 ) {
	$post_id = (int) $post_id;
	if ( !$post = get_post( $post_id ) )
		return false;
	if ( !is_array( $imagedata = wp_get_attachment_metadata( $post->ID ) ) )
		return false;

	$file = get_attached_file( $post->ID );

	if ( !empty($imagedata['thumb']) && ($thumbfile = str_replace(basename($file), $imagedata['thumb'], $file)) && file_exists($thumbfile) ) {
		/**
		 * Filters the attachment thumbnail file path.
		 *
		 * @since 2.1.0
		 *
		 * @param string $thumbfile File path to the attachment thumbnail.
		 * @param int    $post_id   Attachment ID.
		 */
		return apply_filters( 'wp_get_attachment_thumb_file', $thumbfile, $post->ID );
	}
	return false;
}

/**
 * Retrieve URL for an attachment thumbnail.
 *
 * @since 2.1.0
 *
 * @param int $post_id Optional. Attachment ID. Default 0.
 * @return string|false False on failure. Thumbnail URL on success.
 */
function wp_get_attachment_thumb_url( $post_id = 0 ) {
	$post_id = (int) $post_id;
	if ( !$post = get_post( $post_id ) )
		return false;
	if ( !$url = wp_get_attachment_url( $post->ID ) )
		return false;

	$sized = image_downsize( $post_id, 'thumbnail' );
	if ( $sized )
		return $sized[0];

	if ( !$thumb = wp_get_attachment_thumb_file( $post->ID ) )
		return false;

	$url = str_replace(basename($url), basename($thumb), $url);

	/**
	 * Filters the attachment thumbnail URL.
	 *
	 * @since 2.1.0
	 *
	 * @param string $url     URL for the attachment thumbnail.
	 * @param int    $post_id Attachment ID.
	 */
	return apply_filters( 'wp_get_attachment_thumb_url', $url, $post->ID );
}

/**
 * Verifies an attachment is of a given type.
 *
 * @since 4.2.0
 *
 * @param string      $type Attachment type. Accepts 'image', 'audio', or 'video'.
 * @param int|WP_Post $post Optional. Attachment ID or object. Default is global $post.
 * @return bool True if one of the accepted types, false otherwise.
 */
function wp_attachment_is( $type, $post = null ) {
	if ( ! $post = get_post( $post ) ) {
		return false;
	}

	if ( ! $file = get_attached_file( $post->ID ) ) {
		return false;
	}

	if ( 0 === strpos( $post->post_mime_type, $type . '/' ) ) {
		return true;
	}

	$check = wp_check_filetype( $file );
	if ( empty( $check['ext'] ) ) {
		return false;
	}

	$ext = $check['ext'];

	if ( 'import' !== $post->post_mime_type ) {
		return $type === $ext;
	}

	switch ( $type ) {
	case 'image':
		$image_exts = array( 'jpg', 'jpeg', 'jpe', 'gif', 'png' );
		return in_array( $ext, $image_exts );

	case 'audio':
		return in_array( $ext, wp_get_audio_extensions() );

	case 'video':
		return in_array( $ext, wp_get_video_extensions() );

	default:
		return $type === $ext;
	}
}

/**
 * Determines whether an attachment is an image.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 2.1.0
 * @since 4.2.0 Modified into wrapper for wp_attachment_is() and
 *              allowed WP_Post object to be passed.
 *
 * @param int|WP_Post $post Optional. Attachment ID or object. Default is global $post.
 * @return bool Whether the attachment is an image.
 */
function wp_attachment_is_image( $post = null ) {
	return wp_attachment_is( 'image', $post );
}

/**
 * Retrieve the icon for a MIME type.
 *
 * @since 2.1.0
 *
 * @param string|int $mime MIME type or attachment ID.
 * @return string|false Icon, false otherwise.
 */
function wp_mime_type_icon( $mime = 0 ) {
	if ( !is_numeric($mime) )
		$icon = wp_cache_get("mime_type_icon_$mime");

	$post_id = 0;
	if ( empty($icon) ) {
		$post_mimes = array();
		if ( is_numeric($mime) ) {
			$mime = (int) $mime;
			if ( $post = get_post( $mime ) ) {
				$post_id = (int) $post->ID;
				$file = get_attached_file( $post_id );
				$ext = preg_replace('/^.+?\.([^.]+)$/', '$1', $file);
				if ( !empty($ext) ) {
					$post_mimes[] = $ext;
					if ( $ext_type = wp_ext2type( $ext ) )
						$post_mimes[] = $ext_type;
				}
				$mime = $post->post_mime_type;
			} else {
				$mime = 0;
			}
		} else {
			$post_mimes[] = $mime;
		}

		$icon_files = wp_cache_get('icon_files');

		if ( !is_array($icon_files) ) {
			/**
			 * Filters the icon directory path.
			 *
			 * @since 2.0.0
			 *
			 * @param string $path Icon directory absolute path.
			 */
			$icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/media' );

			/**
			 * Filters the icon directory URI.
			 *
			 * @since 2.0.0
			 *
			 * @param string $uri Icon directory URI.
			 */
			$icon_dir_uri = apply_filters( 'icon_dir_uri', includes_url( 'images/media' ) );

			/**
			 * Filters the list of icon directory URIs.
			 *
			 * @since 2.5.0
			 *
			 * @param array $uris List of icon directory URIs.
			 */
			$dirs = apply_filters( 'icon_dirs', array( $icon_dir => $icon_dir_uri ) );
			$icon_files = array();
			while ( $dirs ) {
				$keys = array_keys( $dirs );
				$dir = array_shift( $keys );
				$uri = array_shift($dirs);
				if ( $dh = opendir($dir) ) {
					while ( false !== $file = readdir($dh) ) {
						$file = basename($file);
						if ( substr($file, 0, 1) == '.' )
							continue;
						if ( !in_array(strtolower(substr($file, -4)), array('.png', '.gif', '.jpg') ) ) {
							if ( is_dir("$dir/$file") )
								$dirs["$dir/$file"] = "$uri/$file";
							continue;
						}
						$icon_files["$dir/$file"] = "$uri/$file";
					}
					closedir($dh);
				}
			}
			wp_cache_add( 'icon_files', $icon_files, 'default', 600 );
		}

		$types = array();
		// Icon basename - extension = MIME wildcard.
		foreach ( $icon_files as $file => $uri )
			$types[ preg_replace('/^([^.]*).*$/', '$1', basename($file)) ] =& $icon_files[$file];

		if ( ! empty($mime) ) {
			$post_mimes[] = substr($mime, 0, strpos($mime, '/'));
			$post_mimes[] = substr($mime, strpos($mime, '/') + 1);
			$post_mimes[] = str_replace('/', '_', $mime);
		}

		$matches = wp_match_mime_types(array_keys($types), $post_mimes);
		$matches['default'] = array('default');

		foreach ( $matches as $match => $wilds ) {
			foreach ( $wilds as $wild ) {
				if ( ! isset( $types[ $wild ] ) ) {
					continue;
				}

				$icon = $types[ $wild ];
				if ( ! is_numeric( $mime ) ) {
					wp_cache_add( "mime_type_icon_$mime", $icon );
				}
				break 2;
			}
		}
	}

	/**
	 * Filters the mime type icon.
	 *
	 * @since 2.1.0
	 *
	 * @param string $icon    Path to the mime type icon.
	 * @param string $mime    Mime type.
	 * @param int    $post_id Attachment ID. Will equal 0 if the function passed
	 *                        the mime type.
	 */
	return apply_filters( 'wp_mime_type_icon', $icon, $mime, $post_id );
}

/**
 * Check for changed slugs for published post objects and save the old slug.
 *
 * The function is used when a post object of any type is updated,
 * by comparing the current and previous post objects.
 *
 * If the slug was changed and not already part of the old slugs then it will be
 * added to the post meta field ('_wp_old_slug') for storing old slugs for that
 * post.
 *
 * The most logically usage of this function is redirecting changed post objects, so
 * that those that linked to an changed post will be redirected to the new post.
 *
 * @since 2.1.0
 *
 * @param int     $post_id     Post ID.
 * @param WP_Post $post        The Post Object
 * @param WP_Post $post_before The Previous Post Object
 */
function wp_check_for_changed_slugs( $post_id, $post, $post_before ) {
	// Don't bother if it hasn't changed.
	if ( $post->post_name == $post_before->post_name ) {
		return;
	}

	// We're only concerned with published, non-hierarchical objects.
	if ( ! ( 'publish' === $post->post_status || ( 'attachment' === get_post_type( $post ) && 'inherit' === $post->post_status ) ) || is_post_type_hierarchical( $post->post_type ) ) {
		return;
	}

	$old_slugs = (array) get_post_meta( $post_id, '_wp_old_slug' );

	// If we haven't added this old slug before, add it now.
	if ( ! empty( $post_before->post_name ) && ! in_array( $post_before->post_name, $old_slugs ) ) {
		add_post_meta( $post_id, '_wp_old_slug', $post_before->post_name );
	}

	// If the new slug was used previously, delete it from the list.
	if ( in_array( $post->post_name, $old_slugs ) ) {
		delete_post_meta( $post_id, '_wp_old_slug', $post->post_name );
	}
}

/**
 * Check for changed dates for published post objects and save the old date.
 *
 * The function is used when a post object of any type is updated,
 * by comparing the current and previous post objects.
 *
 * If the date was changed and not already part of the old dates then it will be
 * added to the post meta field ('_wp_old_date') for storing old dates for that
 * post.
 *
 * The most logically usage of this function is redirecting changed post objects, so
 * that those that linked to an changed post will be redirected to the new post.
 *
 * @since 4.9.3
 *
 * @param int     $post_id     Post ID.
 * @param WP_Post $post        The Post Object
 * @param WP_Post $post_before The Previous Post Object
 */
function wp_check_for_changed_dates( $post_id, $post, $post_before ) {
	$previous_date = date( 'Y-m-d', strtotime( $post_before->post_date ) );
	$new_date = date( 'Y-m-d', strtotime( $post->post_date ) );
	// Don't bother if it hasn't changed.
	if ( $new_date == $previous_date ) {
		return;
	}
	// We're only concerned with published, non-hierarchical objects.
	if ( ! ( 'publish' === $post->post_status || ( 'attachment' === get_post_type( $post ) && 'inherit' === $post->post_status ) ) || is_post_type_hierarchical( $post->post_type ) ) {
		return;
	}
	$old_dates = (array) get_post_meta( $post_id, '_wp_old_date' );
	// If we haven't added this old date before, add it now.
	if ( ! empty( $previous_date ) && ! in_array( $previous_date, $old_dates ) ) {
		add_post_meta( $post_id, '_wp_old_date', $previous_date );
	}
	// If the new slug was used previously, delete it from the list.
	if ( in_array( $new_date, $old_dates ) ) {
		delete_post_meta( $post_id, '_wp_old_date', $new_date );
	}
}

/**
 * Retrieve the private post SQL based on capability.
 *
 * This function provides a standardized way to appropriately select on the
 * post_status of a post type. The function will return a piece of SQL code
 * that can be added to a WHERE clause; this SQL is constructed to allow all
 * published posts, and all private posts to which the user has access.
 *
 * @since 2.2.0
 * @since 4.3.0 Added the ability to pass an array to `$post_type`.
 *
 * @param string|array $post_type Single post type or an array of post types. Currently only supports 'post' or 'page'.
 * @return string SQL code that can be added to a where clause.
 */
function get_private_posts_cap_sql( $post_type ) {
	return get_posts_by_author_sql( $post_type, false );
}

/**
 * Retrieve the post SQL based on capability, author, and type.
 *
 * @since 3.0.0
 * @since 4.3.0 Introduced the ability to pass an array of post types to `$post_type`.
 *
 * @see get_private_posts_cap_sql()
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param array|string   $post_type   Single post type or an array of post types.
 * @param bool           $full        Optional. Returns a full WHERE statement instead of just
 *                                    an 'andalso' term. Default true.
 * @param int            $post_author Optional. Query posts having a single author ID. Default null.
 * @param bool           $public_only Optional. Only return public posts. Skips cap checks for
 *                                    $current_user.  Default false.
 * @return string SQL WHERE code that can be added to a query.
 */
function get_posts_by_author_sql( $post_type, $full = true, $post_author = null, $public_only = false ) {
	global $wpdb;

	if ( is_array( $post_type ) ) {
		$post_types = $post_type;
	} else {
		$post_types = array( $post_type );
	}

	$post_type_clauses = array();
	foreach ( $post_types as $post_type ) {
		$post_type_obj = get_post_type_object( $post_type );
		if ( ! $post_type_obj ) {
			continue;
		}

		/**
		 * Filters the capability to read private posts for a custom post type
		 * when generating SQL for getting posts by author.
		 *
		 * @since 2.2.0
		 * @deprecated 3.2.0 The hook transitioned from "somewhat useless" to "totally useless".
		 *
		 * @param string $cap Capability.
		 */
		if ( ! $cap = apply_filters( 'pub_priv_sql_capability', '' ) ) {
			$cap = current_user_can( $post_type_obj->cap->read_private_posts );
		}

		// Only need to check the cap if $public_only is false.
		$post_status_sql = "post_status = 'publish'";
		if ( false === $public_only ) {
			if ( $cap ) {
				// Does the user have the capability to view private posts? Guess so.
				$post_status_sql .= " OR post_status = 'private'";
			} elseif ( is_user_logged_in() ) {
				// Users can view their own private posts.
				$id = get_current_user_id();
				if ( null === $post_author || ! $full ) {
					$post_status_sql .= " OR post_status = 'private' AND post_author = $id";
				} elseif ( $id == (int) $post_author ) {
					$post_status_sql .= " OR post_status = 'private'";
				} // else none
			} // else none
		}

		$post_type_clauses[] = "( post_type = '" . $post_type . "' AND ( $post_status_sql ) )";
	}

	if ( empty( $post_type_clauses ) ) {
		return $full ? 'WHERE 1 = 0' : '1 = 0';
	}

	$sql = '( '. implode( ' OR ', $post_type_clauses ) . ' )';

	if ( null !== $post_author ) {
		$sql .= $wpdb->prepare( ' AND post_author = %d', $post_author );
	}

	if ( $full ) {
		$sql = 'WHERE ' . $sql;
	}

	return $sql;
}

/**
 * Retrieve the date that the last post was published.
 *
 * The server timezone is the default and is the difference between GMT and
 * server time. The 'blog' value is the date when the last post was posted. The
 * 'gmt' is when the last post was posted in GMT formatted date.
 *
 * @since 0.71
 * @since 4.4.0 The `$post_type` argument was added.
 *
 * @param string $timezone  Optional. The timezone for the timestamp. Accepts 'server', 'blog', or 'gmt'.
 *                          'server' uses the server's internal timezone.
 *                          'blog' uses the `post_modified` field, which proxies to the timezone set for the site.
 *                          'gmt' uses the `post_modified_gmt` field.
 *                          Default 'server'.
 * @param string $post_type Optional. The post type to check. Default 'any'.
 * @return string The date of the last post.
 */
function get_lastpostdate( $timezone = 'server', $post_type = 'any' ) {
	/**
	 * Filters the date the last post was published.
	 *
	 * @since 2.3.0
	 *
	 * @param string $date     Date the last post was published.
	 * @param string $timezone Location to use for getting the post published date.
	 *                         See get_lastpostdate() for accepted `$timezone` values.
	 */
	return apply_filters( 'get_lastpostdate', _get_last_post_time( $timezone, 'date', $post_type ), $timezone );
}

/**
 * Get the timestamp of the last time any post was modified.
 *
 * The server timezone is the default and is the difference between GMT and
 * server time. The 'blog' value is just when the last post was modified. The
 * 'gmt' is when the last post was modified in GMT time.
 *
 * @since 1.2.0
 * @since 4.4.0 The `$post_type` argument was added.
 *
 * @param string $timezone  Optional. The timezone for the timestamp. See get_lastpostdate()
 *                          for information on accepted values.
 *                          Default 'server'.
 * @param string $post_type Optional. The post type to check. Default 'any'.
 * @return string The timestamp.
 */
function get_lastpostmodified( $timezone = 'server', $post_type = 'any' ) {
	/**
	 * Pre-filter the return value of get_lastpostmodified() before the query is run.
	 *
	 * @since 4.4.0
	 *
	 * @param string $lastpostmodified Date the last post was modified.
	 *                                 Returning anything other than false will short-circuit the function.
	 * @param string $timezone         Location to use for getting the post modified date.
	 *                                 See get_lastpostdate() for accepted `$timezone` values.
	 * @param string $post_type        The post type to check.
	 */
	$lastpostmodified = apply_filters( 'pre_get_lastpostmodified', false, $timezone, $post_type );
	if ( false !== $lastpostmodified ) {
		return $lastpostmodified;
	}

	$lastpostmodified = _get_last_post_time( $timezone, 'modified', $post_type );

	$lastpostdate = get_lastpostdate($timezone);
	if ( $lastpostdate > $lastpostmodified ) {
		$lastpostmodified = $lastpostdate;
	}

	/**
	 * Filters the date the last post was modified.
	 *
	 * @since 2.3.0
	 *
	 * @param string $lastpostmodified Date the last post was modified.
	 * @param string $timezone         Location to use for getting the post modified date.
	 *                                 See get_lastpostdate() for accepted `$timezone` values.
	 */
	return apply_filters( 'get_lastpostmodified', $lastpostmodified, $timezone );
}

/**
 * Get the timestamp of the last time any post was modified or published.
 *
 * @since 3.1.0
 * @since 4.4.0 The `$post_type` argument was added.
 * @access private
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $timezone  The timezone for the timestamp. See get_lastpostdate().
 *                          for information on accepted values.
 * @param string $field     Post field to check. Accepts 'date' or 'modified'.
 * @param string $post_type Optional. The post type to check. Default 'any'.
 * @return string|false The timestamp.
 */
function _get_last_post_time( $timezone, $field, $post_type = 'any' ) {
	global $wpdb;

	if ( ! in_array( $field, array( 'date', 'modified' ) ) ) {
		return false;
	}

	$timezone = strtolower( $timezone );

	$key = "lastpost{$field}:$timezone";
	if ( 'any' !== $post_type ) {
		$key .= ':' . sanitize_key( $post_type );
	}

	$date = wp_cache_get( $key, 'timeinfo' );
	if ( false !== $date ) {
		return $date;
	}

	if ( 'any' === $post_type ) {
		$post_types = get_post_types( array( 'public' => true ) );
		array_walk( $post_types, array( $wpdb, 'escape_by_ref' ) );
		$post_types = "'" . implode( "', '", $post_types ) . "'";
	} else {
		$post_types = "'" . sanitize_key( $post_type ) . "'";
	}

	switch ( $timezone ) {
		case 'gmt':
			$date = $wpdb->get_var("SELECT post_{$field}_gmt FROM $wpdb->posts WHERE post_status = 'publish' AND post_type IN ({$post_types}) ORDER BY post_{$field}_gmt DESC LIMIT 1");
			break;
		case 'blog':
			$date = $wpdb->get_var("SELECT post_{$field} FROM $wpdb->posts WHERE post_status = 'publish' AND post_type IN ({$post_types}) ORDER BY post_{$field}_gmt DESC LIMIT 1");
			break;
		case 'server':
			$add_seconds_server = date( 'Z' );
			$date = $wpdb->get_var("SELECT DATE_ADD(post_{$field}_gmt, INTERVAL '$add_seconds_server' SECOND) FROM $wpdb->posts WHERE post_status = 'publish' AND post_type IN ({$post_types}) ORDER BY post_{$field}_gmt DESC LIMIT 1");
			break;
	}

	if ( $date ) {
		wp_cache_set( $key, $date, 'timeinfo' );

		return $date;
	}

	return false;
}

/**
 * Updates posts in cache.
 *
 * @since 1.5.1
 *
 * @param array $posts Array of post objects (passed by reference).
 */
function update_post_cache( &$posts ) {
	if ( ! $posts )
		return;

	foreach ( $posts as $post )
		wp_cache_add( $post->ID, $post, 'posts' );
}

/**
 * Will clean the post in the cache.
 *
 * Cleaning means delete from the cache of the post. Will call to clean the term
 * object cache associated with the post ID.
 *
 * This function not run if $_wp_suspend_cache_invalidation is not empty. See
 * wp_suspend_cache_invalidation().
 *
 * @since 2.0.0
 *
 * @global bool $_wp_suspend_cache_invalidation
 *
 * @param int|WP_Post $post Post ID or post object to remove from the cache.
 */
function clean_post_cache( $post ) {
	global $_wp_suspend_cache_invalidation;

	if ( ! empty( $_wp_suspend_cache_invalidation ) )
		return;

	$post = get_post( $post );
	if ( empty( $post ) )
		return;

	wp_cache_delete( $post->ID, 'posts' );
	wp_cache_delete( $post->ID, 'post_meta' );

	clean_object_term_cache( $post->ID, $post->post_type );

	wp_cache_delete( 'wp_get_archives', 'general' );

	/**
	 * Fires immediately after the given post's cache is cleaned.
	 *
	 * @since 2.5.0
	 *
	 * @param int     $post_id Post ID.
	 * @param WP_Post $post    Post object.
	 */
	do_action( 'clean_post_cache', $post->ID, $post );

	if ( 'page' == $post->post_type ) {
		wp_cache_delete( 'all_page_ids', 'posts' );

		/**
		 * Fires immediately after the given page's cache is cleaned.
		 *
		 * @since 2.5.0
		 *
		 * @param int $post_id Post ID.
		 */
		do_action( 'clean_page_cache', $post->ID );
	}

	wp_cache_set( 'last_changed', microtime(), 'posts' );
}

/**
 * Call major cache updating functions for list of Post objects.
 *
 * @since 1.5.0
 *
 * @param array  $posts             Array of Post objects
 * @param string $post_type         Optional. Post type. Default 'post'.
 * @param bool   $update_term_cache Optional. Whether to update the term cache. Default true.
 * @param bool   $update_meta_cache Optional. Whether to update the meta cache. Default true.
 */
function update_post_caches( &$posts, $post_type = 'post', $update_term_cache = true, $update_meta_cache = true ) {
	// No point in doing all this work if we didn't match any posts.
	if ( !$posts )
		return;

	update_post_cache($posts);

	$post_ids = array();
	foreach ( $posts as $post )
		$post_ids[] = $post->ID;

	if ( ! $post_type )
		$post_type = 'any';

	if ( $update_term_cache ) {
		if ( is_array($post_type) ) {
			$ptypes = $post_type;
		} elseif ( 'any' == $post_type ) {
			$ptypes = array();
			// Just use the post_types in the supplied posts.
			foreach ( $posts as $post ) {
				$ptypes[] = $post->post_type;
			}
			$ptypes = array_unique($ptypes);
		} else {
			$ptypes = array($post_type);
		}

		if ( ! empty($ptypes) )
			update_object_term_cache($post_ids, $ptypes);
	}

	if ( $update_meta_cache )
		update_postmeta_cache($post_ids);
}

/**
 * Updates metadata cache for list of post IDs.
 *
 * Performs SQL query to retrieve the metadata for the post IDs and updates the
 * metadata cache for the posts. Therefore, the functions, which call this
 * function, do not need to perform SQL queries on their own.
 *
 * @since 2.1.0
 *
 * @param array $post_ids List of post IDs.
 * @return array|false Returns false if there is nothing to update or an array
 *                     of metadata.
 */
function update_postmeta_cache( $post_ids ) {
	return update_meta_cache('post', $post_ids);
}

/**
 * Will clean the attachment in the cache.
 *
 * Cleaning means delete from the cache. Optionally will clean the term
 * object cache associated with the attachment ID.
 *
 * This function will not run if $_wp_suspend_cache_invalidation is not empty.
 *
 * @since 3.0.0
 *
 * @global bool $_wp_suspend_cache_invalidation
 *
 * @param int  $id          The attachment ID in the cache to clean.
 * @param bool $clean_terms Optional. Whether to clean terms cache. Default false.
 */
function clean_attachment_cache( $id, $clean_terms = false ) {
	global $_wp_suspend_cache_invalidation;

	if ( !empty($_wp_suspend_cache_invalidation) )
		return;

	$id = (int) $id;

	wp_cache_delete($id, 'posts');
	wp_cache_delete($id, 'post_meta');

	if ( $clean_terms )
		clean_object_term_cache($id, 'attachment');

	/**
	 * Fires after the given attachment's cache is cleaned.
	 *
	 * @since 3.0.0
	 *
	 * @param int $id Attachment ID.
	 */
	do_action( 'clean_attachment_cache', $id );
}

//
// Hooks
//

/**
 * Hook for managing future post transitions to published.
 *
 * @since 2.3.0
 * @access private
 *
 * @see wp_clear_scheduled_hook()
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string  $new_status New post status.
 * @param string  $old_status Previous post status.
 * @param WP_Post $post       Post object.
 */
function _transition_post_status( $new_status, $old_status, $post ) {
	global $wpdb;

	if ( $old_status != 'publish' && $new_status == 'publish' ) {
		// Reset GUID if transitioning to publish and it is empty.
		if ( '' == get_the_guid($post->ID) )
			$wpdb->update( $wpdb->posts, array( 'guid' => get_permalink( $post->ID ) ), array( 'ID' => $post->ID ) );

		/**
		 * Fires when a post's status is transitioned from private to published.
		 *
		 * @since 1.5.0
		 * @deprecated 2.3.0 Use 'private_to_publish' instead.
		 *
		 * @param int $post_id Post ID.
		 */
		do_action('private_to_published', $post->ID);
	}

	// If published posts changed clear the lastpostmodified cache.
	if ( 'publish' == $new_status || 'publish' == $old_status) {
		foreach ( array( 'server', 'gmt', 'blog' ) as $timezone ) {
			wp_cache_delete( "lastpostmodified:$timezone", 'timeinfo' );
			wp_cache_delete( "lastpostdate:$timezone", 'timeinfo' );
			wp_cache_delete( "lastpostdate:$timezone:{$post->post_type}", 'timeinfo' );
		}
	}

	if ( $new_status !== $old_status ) {
		wp_cache_delete( _count_posts_cache_key( $post->post_type ), 'counts' );
		wp_cache_delete( _count_posts_cache_key( $post->post_type, 'readable' ), 'counts' );
	}

	// Always clears the hook in case the post status bounced from future to draft.
	wp_clear_scheduled_hook('publish_future_post', array( $post->ID ) );
}

/**
 * Hook used to schedule publication for a post marked for the future.
 *
 * The $post properties used and must exist are 'ID' and 'post_date_gmt'.
 *
 * @since 2.3.0
 * @access private
 *
 * @param int     $deprecated Not used. Can be set to null. Never implemented. Not marked
 *                            as deprecated with _deprecated_argument() as it conflicts with
 *                            wp_transition_post_status() and the default filter for _future_post_hook().
 * @param WP_Post $post       Post object.
 */
function _future_post_hook( $deprecated, $post ) {
	wp_clear_scheduled_hook( 'publish_future_post', array( $post->ID ) );
	wp_schedule_single_event( strtotime( get_gmt_from_date( $post->post_date ) . ' GMT') , 'publish_future_post', array( $post->ID ) );
}

/**
 * Hook to schedule pings and enclosures when a post is published.
 *
 * Uses XMLRPC_REQUEST and WP_IMPORTING constants.
 *
 * @since 2.3.0
 * @access private
 *
 * @param int $post_id The ID in the database table of the post being published.
 */
function _publish_post_hook( $post_id ) {
	if ( defined( 'XMLRPC_REQUEST' ) ) {
		/**
		 * Fires when _publish_post_hook() is called during an XML-RPC request.
		 *
		 * @since 2.1.0
		 *
		 * @param int $post_id Post ID.
		 */
		do_action( 'xmlrpc_publish_post', $post_id );
	}

	if ( defined('WP_IMPORTING') )
		return;

	if ( get_option('default_pingback_flag') )
		add_post_meta( $post_id, '_pingme', '1' );
	add_post_meta( $post_id, '_encloseme', '1' );

	if ( ! wp_next_scheduled( 'do_pings' ) ) {
		wp_schedule_single_event( time(), 'do_pings' );
	}
}

/**
 * Return the post's parent's post_ID
 *
 * @since 3.1.0
 *
 * @param int $post_ID
 *
 * @return int|false Post parent ID, otherwise false.
 */
function wp_get_post_parent_id( $post_ID ) {
	$post = get_post( $post_ID );
	if ( !$post || is_wp_error( $post ) )
		return false;
	return (int) $post->post_parent;
}

/**
 * Check the given subset of the post hierarchy for hierarchy loops.
 *
 * Prevents loops from forming and breaks those that it finds. Attached
 * to the {@see 'wp_insert_post_parent'} filter.
 *
 * @since 3.1.0
 *
 * @see wp_find_hierarchy_loop()
 *
 * @param int $post_parent ID of the parent for the post we're checking.
 * @param int $post_ID     ID of the post we're checking.
 * @return int The new post_parent for the post, 0 otherwise.
 */
function wp_check_post_hierarchy_for_loops( $post_parent, $post_ID ) {
	// Nothing fancy here - bail.
	if ( !$post_parent )
		return 0;

	// New post can't cause a loop.
	if ( empty( $post_ID ) )
		return $post_parent;

	// Can't be its own parent.
	if ( $post_parent == $post_ID )
		return 0;

	// Now look for larger loops.
	if ( !$loop = wp_find_hierarchy_loop( 'wp_get_post_parent_id', $post_ID, $post_parent ) )
		return $post_parent; // No loop

	// Setting $post_parent to the given value causes a loop.
	if ( isset( $loop[$post_ID] ) )
		return 0;

	// There's a loop, but it doesn't contain $post_ID. Break the loop.
	foreach ( array_keys( $loop ) as $loop_member )
		wp_update_post( array( 'ID' => $loop_member, 'post_parent' => 0 ) );

	return $post_parent;
}

/**
 * Set a post thumbnail.
 *
 * @since 3.1.0
 *
 * @param int|WP_Post $post         Post ID or post object where thumbnail should be attached.
 * @param int         $thumbnail_id Thumbnail to attach.
 * @return int|bool True on success, false on failure.
 */
function set_post_thumbnail( $post, $thumbnail_id ) {
	$post = get_post( $post );
	$thumbnail_id = absint( $thumbnail_id );
	if ( $post && $thumbnail_id && get_post( $thumbnail_id ) ) {
		if ( wp_get_attachment_image( $thumbnail_id, 'thumbnail' ) )
			return update_post_meta( $post->ID, '_thumbnail_id', $thumbnail_id );
		else
			return delete_post_meta( $post->ID, '_thumbnail_id' );
	}
	return false;
}

/**
 * Remove a post thumbnail.
 *
 * @since 3.3.0
 *
 * @param int|WP_Post $post Post ID or post object where thumbnail should be removed from.
 * @return bool True on success, false on failure.
 */
function delete_post_thumbnail( $post ) {
	$post = get_post( $post );
	if ( $post )
		return delete_post_meta( $post->ID, '_thumbnail_id' );
	return false;
}

/**
 * Delete auto-drafts for new posts that are > 7 days old.
 *
 * @since 3.4.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 */
function wp_delete_auto_drafts() {
	global $wpdb;

	// Cleanup old auto-drafts more than 7 days old.
	$old_posts = $wpdb->get_col( "SELECT ID FROM $wpdb->posts WHERE post_status = 'auto-draft' AND DATE_SUB( NOW(), INTERVAL 7 DAY ) > post_date" );
	foreach ( (array) $old_posts as $delete ) {
		// Force delete.
		wp_delete_post( $delete, true );
	}
}

/**
 * Queues posts for lazy-loading of term meta.
 *
 * @since 4.5.0
 *
 * @param array $posts Array of WP_Post objects.
 */
function wp_queue_posts_for_term_meta_lazyload( $posts ) {
	$post_type_taxonomies = $term_ids = array();
	foreach ( $posts as $post ) {
		if ( ! ( $post instanceof WP_Post ) ) {
			continue;
		}

		if ( ! isset( $post_type_taxonomies[ $post->post_type ] ) ) {
			$post_type_taxonomies[ $post->post_type ] = get_object_taxonomies( $post->post_type );
		}

		foreach ( $post_type_taxonomies[ $post->post_type ] as $taxonomy ) {
			// Term cache should already be primed by `update_post_term_cache()`.
			$terms = get_object_term_cache( $post->ID, $taxonomy );
			if ( false !== $terms ) {
				foreach ( $terms as $term ) {
					if ( ! isset( $term_ids[ $term->term_id ] ) ) {
						$term_ids[] = $term->term_id;
					}
				}
			}
		}
	}

	if ( $term_ids ) {
		$lazyloader = wp_metadata_lazyloader();
		$lazyloader->queue_objects( 'term', $term_ids );
	}
}

/**
 * Update the custom taxonomies' term counts when a post's status is changed.
 *
 * For example, default posts term counts (for custom taxonomies) don't include
 * private / draft posts.
 *
 * @since 3.3.0
 * @access private
 *
 * @param string  $new_status New post status.
 * @param string  $old_status Old post status.
 * @param WP_Post $post       Post object.
 */
function _update_term_count_on_transition_post_status( $new_status, $old_status, $post ) {
	// Update counts for the post's terms.
	foreach ( (array) get_object_taxonomies( $post->post_type ) as $taxonomy ) {
		$tt_ids = wp_get_object_terms( $post->ID, $taxonomy, array( 'fields' => 'tt_ids' ) );
		wp_update_term_count( $tt_ids, $taxonomy );
	}
}

/**
 * Adds any posts from the given ids to the cache that do not already exist in cache
 *
 * @since 3.4.0
 * @access private
 *
 * @see update_post_caches()
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param array $ids               ID list.
 * @param bool  $update_term_cache Optional. Whether to update the term cache. Default true.
 * @param bool  $update_meta_cache Optional. Whether to update the meta cache. Default true.
 */
function _prime_post_caches( $ids, $update_term_cache = true, $update_meta_cache = true ) {
	global $wpdb;

	$non_cached_ids = _get_non_cached_ids( $ids, 'posts' );
	if ( !empty( $non_cached_ids ) ) {
		$fresh_posts = $wpdb->get_results( sprintf( "SELECT $wpdb->posts.* FROM $wpdb->posts WHERE ID IN (%s)", join( ",", $non_cached_ids ) ) );

		update_post_caches( $fresh_posts, 'any', $update_term_cache, $update_meta_cache );
	}
}

/**
 * Adds a suffix if any trashed posts have a given slug.
 *
 * Store its desired (i.e. current) slug so it can try to reclaim it
 * if the post is untrashed.
 *
 * For internal use.
 *
 * @since 4.5.0
 * @access private
 *
 * @param string $post_name Slug.
 * @param string $post_ID   Optional. Post ID that should be ignored. Default 0.
 */
function wp_add_trashed_suffix_to_post_name_for_trashed_posts( $post_name, $post_ID = 0 ) {
	$trashed_posts_with_desired_slug = get_posts( array(
		'name' => $post_name,
		'post_status' => 'trash',
		'post_type' => 'any',
		'nopaging' => true,
		'post__not_in' => array( $post_ID )
	) );

	if ( ! empty( $trashed_posts_with_desired_slug ) ) {
		foreach ( $trashed_posts_with_desired_slug as $_post ) {
			wp_add_trashed_suffix_to_post_name_for_post( $_post );
		}
	}
}

/**
 * Adds a trashed suffix for a given post.
 *
 * Store its desired (i.e. current) slug so it can try to reclaim it
 * if the post is untrashed.
 *
 * For internal use.
 *
 * @since 4.5.0
 * @access private
 *
 * @param WP_Post $post The post.
 * @return string New slug for the post.
 */
function wp_add_trashed_suffix_to_post_name_for_post( $post ) {
	global $wpdb;

	$post = get_post( $post );

	if ( '__trashed' === substr( $post->post_name, -9 ) ) {
		return $post->post_name;
	}
	add_post_meta( $post->ID, '_wp_desired_post_slug', $post->post_name );
	$post_name = _truncate_post_slug( $post->post_name, 191 ) . '__trashed';
	$wpdb->update( $wpdb->posts, array( 'post_name' => $post_name ), array( 'ID' => $post->ID ) );
	clean_post_cache( $post->ID );
	return $post_name;
}

/**
 * Sets the last changed time for the 'posts' cache group.
 *
 * @since 5.0.0
 */
function wp_cache_set_posts_last_changed() {
	wp_cache_set( 'last_changed', microtime(), 'posts' );
}
home/xbodynamge/lebauwcentre/wp-includes/post.php000064400000713544151130541560016260 0ustar00<?php
/**
 * Core Post API
 *
 * @package WordPress
 * @subpackage Post
 */

//
// Post Type Registration
//

/**
 * Creates the initial post types when 'init' action is fired.
 *
 * See {@see 'init'}.
 *
 * @since 2.9.0
 */
function create_initial_post_types() {
	register_post_type(
		'post',
		array(
			'labels'                => array(
				'name_admin_bar' => _x( 'Post', 'add new from admin bar' ),
			),
			'public'                => true,
			'_builtin'              => true, /* internal use only. don't use this when registering your own post type. */
			'_edit_link'            => 'post.php?post=%d', /* internal use only. don't use this when registering your own post type. */
			'capability_type'       => 'post',
			'map_meta_cap'          => true,
			'menu_position'         => 5,
			'hierarchical'          => false,
			'rewrite'               => false,
			'query_var'             => false,
			'delete_with_user'      => true,
			'supports'              => array( 'title', 'editor', 'author', 'thumbnail', 'excerpt', 'trackbacks', 'custom-fields', 'comments', 'revisions', 'post-formats' ),
			'show_in_rest'          => true,
			'rest_base'             => 'posts',
			'rest_controller_class' => 'WP_REST_Posts_Controller',
		)
	);

	register_post_type(
		'page',
		array(
			'labels'                => array(
				'name_admin_bar' => _x( 'Page', 'add new from admin bar' ),
			),
			'public'                => true,
			'publicly_queryable'    => false,
			'_builtin'              => true, /* internal use only. don't use this when registering your own post type. */
			'_edit_link'            => 'post.php?post=%d', /* internal use only. don't use this when registering your own post type. */
			'capability_type'       => 'page',
			'map_meta_cap'          => true,
			'menu_position'         => 20,
			'hierarchical'          => true,
			'rewrite'               => false,
			'query_var'             => false,
			'delete_with_user'      => true,
			'supports'              => array( 'title', 'editor', 'author', 'thumbnail', 'page-attributes', 'custom-fields', 'comments', 'revisions' ),
			'show_in_rest'          => true,
			'rest_base'             => 'pages',
			'rest_controller_class' => 'WP_REST_Posts_Controller',
		)
	);

	register_post_type(
		'attachment',
		array(
			'labels'                => array(
				'name'           => _x( 'Media', 'post type general name' ),
				'name_admin_bar' => _x( 'Media', 'add new from admin bar' ),
				'add_new'        => _x( 'Add New', 'add new media' ),
				'edit_item'      => __( 'Edit Media' ),
				'view_item'      => __( 'View Attachment Page' ),
				'attributes'     => __( 'Attachment Attributes' ),
			),
			'public'                => true,
			'show_ui'               => true,
			'_builtin'              => true, /* internal use only. don't use this when registering your own post type. */
			'_edit_link'            => 'post.php?post=%d', /* internal use only. don't use this when registering your own post type. */
			'capability_type'       => 'post',
			'capabilities'          => array(
				'create_posts' => 'upload_files',
			),
			'map_meta_cap'          => true,
			'hierarchical'          => false,
			'rewrite'               => false,
			'query_var'             => false,
			'show_in_nav_menus'     => false,
			'delete_with_user'      => true,
			'supports'              => array( 'title', 'author', 'comments' ),
			'show_in_rest'          => true,
			'rest_base'             => 'media',
			'rest_controller_class' => 'WP_REST_Attachments_Controller',
		)
	);
	add_post_type_support( 'attachment:audio', 'thumbnail' );
	add_post_type_support( 'attachment:video', 'thumbnail' );

	register_post_type(
		'revision',
		array(
			'labels'           => array(
				'name'          => __( 'Revisions' ),
				'singular_name' => __( 'Revision' ),
			),
			'public'           => false,
			'_builtin'         => true, /* internal use only. don't use this when registering your own post type. */
			'_edit_link'       => 'revision.php?revision=%d', /* internal use only. don't use this when registering your own post type. */
			'capability_type'  => 'post',
			'map_meta_cap'     => true,
			'hierarchical'     => false,
			'rewrite'          => false,
			'query_var'        => false,
			'can_export'       => false,
			'delete_with_user' => true,
			'supports'         => array( 'author' ),
		)
	);

	register_post_type(
		'nav_menu_item',
		array(
			'labels'           => array(
				'name'          => __( 'Navigation Menu Items' ),
				'singular_name' => __( 'Navigation Menu Item' ),
			),
			'public'           => false,
			'_builtin'         => true, /* internal use only. don't use this when registering your own post type. */
			'hierarchical'     => false,
			'rewrite'          => false,
			'delete_with_user' => false,
			'query_var'        => false,
		)
	);

	register_post_type(
		'custom_css',
		array(
			'labels'           => array(
				'name'          => __( 'Custom CSS' ),
				'singular_name' => __( 'Custom CSS' ),
			),
			'public'           => false,
			'hierarchical'     => false,
			'rewrite'          => false,
			'query_var'        => false,
			'delete_with_user' => false,
			'can_export'       => true,
			'_builtin'         => true, /* internal use only. don't use this when registering your own post type. */
			'supports'         => array( 'title', 'revisions' ),
			'capabilities'     => array(
				'delete_posts'           => 'edit_theme_options',
				'delete_post'            => 'edit_theme_options',
				'delete_published_posts' => 'edit_theme_options',
				'delete_private_posts'   => 'edit_theme_options',
				'delete_others_posts'    => 'edit_theme_options',
				'edit_post'              => 'edit_css',
				'edit_posts'             => 'edit_css',
				'edit_others_posts'      => 'edit_css',
				'edit_published_posts'   => 'edit_css',
				'read_post'              => 'read',
				'read_private_posts'     => 'read',
				'publish_posts'          => 'edit_theme_options',
			),
		)
	);

	register_post_type(
		'customize_changeset',
		array(
			'labels'           => array(
				'name'               => _x( 'Changesets', 'post type general name' ),
				'singular_name'      => _x( 'Changeset', 'post type singular name' ),
				'menu_name'          => _x( 'Changesets', 'admin menu' ),
				'name_admin_bar'     => _x( 'Changeset', 'add new on admin bar' ),
				'add_new'            => _x( 'Add New', 'Customize Changeset' ),
				'add_new_item'       => __( 'Add New Changeset' ),
				'new_item'           => __( 'New Changeset' ),
				'edit_item'          => __( 'Edit Changeset' ),
				'view_item'          => __( 'View Changeset' ),
				'all_items'          => __( 'All Changesets' ),
				'search_items'       => __( 'Search Changesets' ),
				'not_found'          => __( 'No changesets found.' ),
				'not_found_in_trash' => __( 'No changesets found in Trash.' ),
			),
			'public'           => false,
			'_builtin'         => true, /* internal use only. don't use this when registering your own post type. */
			'map_meta_cap'     => true,
			'hierarchical'     => false,
			'rewrite'          => false,
			'query_var'        => false,
			'can_export'       => false,
			'delete_with_user' => false,
			'supports'         => array( 'title', 'author' ),
			'capability_type'  => 'customize_changeset',
			'capabilities'     => array(
				'create_posts'           => 'customize',
				'delete_others_posts'    => 'customize',
				'delete_post'            => 'customize',
				'delete_posts'           => 'customize',
				'delete_private_posts'   => 'customize',
				'delete_published_posts' => 'customize',
				'edit_others_posts'      => 'customize',
				'edit_post'              => 'customize',
				'edit_posts'             => 'customize',
				'edit_private_posts'     => 'customize',
				'edit_published_posts'   => 'do_not_allow',
				'publish_posts'          => 'customize',
				'read'                   => 'read',
				'read_post'              => 'customize',
				'read_private_posts'     => 'customize',
			),
		)
	);

	register_post_type(
		'oembed_cache',
		array(
			'labels'           => array(
				'name'          => __( 'oEmbed Responses' ),
				'singular_name' => __( 'oEmbed Response' ),
			),
			'public'           => false,
			'hierarchical'     => false,
			'rewrite'          => false,
			'query_var'        => false,
			'delete_with_user' => false,
			'can_export'       => false,
			'_builtin'         => true, /* internal use only. don't use this when registering your own post type. */
			'supports'         => array(),
		)
	);

	register_post_type(
		'user_request',
		array(
			'labels'           => array(
				'name'          => __( 'User Requests' ),
				'singular_name' => __( 'User Request' ),
			),
			'public'           => false,
			'_builtin'         => true, /* internal use only. don't use this when registering your own post type. */
			'hierarchical'     => false,
			'rewrite'          => false,
			'query_var'        => false,
			'can_export'       => false,
			'delete_with_user' => false,
			'supports'         => array(),
		)
	);

	register_post_type(
		'wp_block',
		array(
			'labels'                => array(
				'name'                     => _x( 'Blocks', 'post type general name' ),
				'singular_name'            => _x( 'Block', 'post type singular name' ),
				'menu_name'                => _x( 'Blocks', 'admin menu' ),
				'name_admin_bar'           => _x( 'Block', 'add new on admin bar' ),
				'add_new'                  => _x( 'Add New', 'Block' ),
				'add_new_item'             => __( 'Add New Block' ),
				'new_item'                 => __( 'New Block' ),
				'edit_item'                => __( 'Edit Block' ),
				'view_item'                => __( 'View Block' ),
				'all_items'                => __( 'All Blocks' ),
				'search_items'             => __( 'Search Blocks' ),
				'not_found'                => __( 'No blocks found.' ),
				'not_found_in_trash'       => __( 'No blocks found in Trash.' ),
				'filter_items_list'        => __( 'Filter blocks list' ),
				'items_list_navigation'    => __( 'Blocks list navigation' ),
				'items_list'               => __( 'Blocks list' ),
				'item_published'           => __( 'Block published.' ),
				'item_published_privately' => __( 'Block published privately.' ),
				'item_reverted_to_draft'   => __( 'Block reverted to draft.' ),
				'item_scheduled'           => __( 'Block scheduled.' ),
				'item_updated'             => __( 'Block updated.' ),
			),
			'public'                => false,
			'_builtin'              => true, /* internal use only. don't use this when registering your own post type. */
			'show_ui'               => true,
			'show_in_menu'          => false,
			'rewrite'               => false,
			'show_in_rest'          => true,
			'rest_base'             => 'blocks',
			'rest_controller_class' => 'WP_REST_Blocks_Controller',
			'capability_type'       => 'block',
			'capabilities'          => array(
				// You need to be able to edit posts, in order to read blocks in their raw form.
				'read'                   => 'edit_posts',
				// You need to be able to publish posts, in order to create blocks.
				'create_posts'           => 'publish_posts',
				'edit_posts'             => 'edit_posts',
				'edit_published_posts'   => 'edit_published_posts',
				'delete_published_posts' => 'delete_published_posts',
				'edit_others_posts'      => 'edit_others_posts',
				'delete_others_posts'    => 'delete_others_posts',
			),
			'map_meta_cap'          => true,
			'supports'              => array(
				'title',
				'editor',
			),
		)
	);

	register_post_status(
		'publish',
		array(
			'label'       => _x( 'Published', 'post status' ),
			'public'      => true,
			'_builtin'    => true, /* internal use only. */
			'label_count' => _n_noop( 'Published <span class="count">(%s)</span>', 'Published <span class="count">(%s)</span>' ),
		)
	);

	register_post_status(
		'future',
		array(
			'label'       => _x( 'Scheduled', 'post status' ),
			'protected'   => true,
			'_builtin'    => true, /* internal use only. */
			'label_count' => _n_noop( 'Scheduled <span class="count">(%s)</span>', 'Scheduled <span class="count">(%s)</span>' ),
		)
	);

	register_post_status(
		'draft',
		array(
			'label'       => _x( 'Draft', 'post status' ),
			'protected'   => true,
			'_builtin'    => true, /* internal use only. */
			'label_count' => _n_noop( 'Draft <span class="count">(%s)</span>', 'Drafts <span class="count">(%s)</span>' ),
		)
	);

	register_post_status(
		'pending',
		array(
			'label'       => _x( 'Pending', 'post status' ),
			'protected'   => true,
			'_builtin'    => true, /* internal use only. */
			'label_count' => _n_noop( 'Pending <span class="count">(%s)</span>', 'Pending <span class="count">(%s)</span>' ),
		)
	);

	register_post_status(
		'private',
		array(
			'label'       => _x( 'Private', 'post status' ),
			'private'     => true,
			'_builtin'    => true, /* internal use only. */
			'label_count' => _n_noop( 'Private <span class="count">(%s)</span>', 'Private <span class="count">(%s)</span>' ),
		)
	);

	register_post_status(
		'trash',
		array(
			'label'                     => _x( 'Trash', 'post status' ),
			'internal'                  => true,
			'_builtin'                  => true, /* internal use only. */
			'label_count'               => _n_noop( 'Trash <span class="count">(%s)</span>', 'Trash <span class="count">(%s)</span>' ),
			'show_in_admin_status_list' => true,
		)
	);

	register_post_status(
		'auto-draft',
		array(
			'label'    => 'auto-draft',
			'internal' => true,
			'_builtin' => true, /* internal use only. */
		)
	);

	register_post_status(
		'inherit',
		array(
			'label'               => 'inherit',
			'internal'            => true,
			'_builtin'            => true, /* internal use only. */
			'exclude_from_search' => false,
		)
	);

	register_post_status(
		'request-pending',
		array(
			'label'               => _x( 'Pending', 'request status' ),
			'internal'            => true,
			'_builtin'            => true, /* internal use only. */
			'label_count'         => _n_noop( 'Pending <span class="count">(%s)</span>', 'Pending <span class="count">(%s)</span>' ),
			'exclude_from_search' => false,
		)
	);

	register_post_status(
		'request-confirmed',
		array(
			'label'               => _x( 'Confirmed', 'request status' ),
			'internal'            => true,
			'_builtin'            => true, /* internal use only. */
			'label_count'         => _n_noop( 'Confirmed <span class="count">(%s)</span>', 'Confirmed <span class="count">(%s)</span>' ),
			'exclude_from_search' => false,
		)
	);

	register_post_status(
		'request-failed',
		array(
			'label'               => _x( 'Failed', 'request status' ),
			'internal'            => true,
			'_builtin'            => true, /* internal use only. */
			'label_count'         => _n_noop( 'Failed <span class="count">(%s)</span>', 'Failed <span class="count">(%s)</span>' ),
			'exclude_from_search' => false,
		)
	);

	register_post_status(
		'request-completed',
		array(
			'label'               => _x( 'Completed', 'request status' ),
			'internal'            => true,
			'_builtin'            => true, /* internal use only. */
			'label_count'         => _n_noop( 'Completed <span class="count">(%s)</span>', 'Completed <span class="count">(%s)</span>' ),
			'exclude_from_search' => false,
		)
	);
}

/**
 * Retrieve attached file path based on attachment ID.
 *
 * By default the path will go through the 'get_attached_file' filter, but
 * passing a true to the $unfiltered argument of get_attached_file() will
 * return the file path unfiltered.
 *
 * The function works by getting the single post meta name, named
 * '_wp_attached_file' and returning it. This is a convenience function to
 * prevent looking up the meta name and provide a mechanism for sending the
 * attached filename through a filter.
 *
 * @since 2.0.0
 *
 * @param int  $attachment_id Attachment ID.
 * @param bool $unfiltered    Optional. Whether to apply filters. Default false.
 * @return string|false The file path to where the attached file should be, false otherwise.
 */
function get_attached_file( $attachment_id, $unfiltered = false ) {
	$file = get_post_meta( $attachment_id, '_wp_attached_file', true );

	// If the file is relative, prepend upload dir.
	if ( $file && 0 !== strpos( $file, '/' ) && ! preg_match( '|^.:\\\|', $file ) && ( ( $uploads = wp_get_upload_dir() ) && false === $uploads['error'] ) ) {
		$file = $uploads['basedir'] . "/$file";
	}

	if ( $unfiltered ) {
		return $file;
	}

	/**
	 * Filters the attached file based on the given ID.
	 *
	 * @since 2.1.0
	 *
	 * @param string $file          Path to attached file.
	 * @param int    $attachment_id Attachment ID.
	 */
	return apply_filters( 'get_attached_file', $file, $attachment_id );
}

/**
 * Update attachment file path based on attachment ID.
 *
 * Used to update the file path of the attachment, which uses post meta name
 * '_wp_attached_file' to store the path of the attachment.
 *
 * @since 2.1.0
 *
 * @param int    $attachment_id Attachment ID.
 * @param string $file          File path for the attachment.
 * @return bool True on success, false on failure.
 */
function update_attached_file( $attachment_id, $file ) {
	if ( ! get_post( $attachment_id ) ) {
		return false;
	}

	/**
	 * Filters the path to the attached file to update.
	 *
	 * @since 2.1.0
	 *
	 * @param string $file          Path to the attached file to update.
	 * @param int    $attachment_id Attachment ID.
	 */
	$file = apply_filters( 'update_attached_file', $file, $attachment_id );

	if ( $file = _wp_relative_upload_path( $file ) ) {
		return update_post_meta( $attachment_id, '_wp_attached_file', $file );
	} else {
		return delete_post_meta( $attachment_id, '_wp_attached_file' );
	}
}

/**
 * Return relative path to an uploaded file.
 *
 * The path is relative to the current upload dir.
 *
 * @since 2.9.0
 * @access private
 *
 * @param string $path Full path to the file.
 * @return string Relative path on success, unchanged path on failure.
 */
function _wp_relative_upload_path( $path ) {
	$new_path = $path;

	$uploads = wp_get_upload_dir();
	if ( 0 === strpos( $new_path, $uploads['basedir'] ) ) {
			$new_path = str_replace( $uploads['basedir'], '', $new_path );
			$new_path = ltrim( $new_path, '/' );
	}

	/**
	 * Filters the relative path to an uploaded file.
	 *
	 * @since 2.9.0
	 *
	 * @param string $new_path Relative path to the file.
	 * @param string $path     Full path to the file.
	 */
	return apply_filters( '_wp_relative_upload_path', $new_path, $path );
}

/**
 * Retrieve all children of the post parent ID.
 *
 * Normally, without any enhancements, the children would apply to pages. In the
 * context of the inner workings of WordPress, pages, posts, and attachments
 * share the same table, so therefore the functionality could apply to any one
 * of them. It is then noted that while this function does not work on posts, it
 * does not mean that it won't work on posts. It is recommended that you know
 * what context you wish to retrieve the children of.
 *
 * Attachments may also be made the child of a post, so if that is an accurate
 * statement (which needs to be verified), it would then be possible to get
 * all of the attachments for a post. Attachments have since changed since
 * version 2.5, so this is most likely inaccurate, but serves generally as an
 * example of what is possible.
 *
 * The arguments listed as defaults are for this function and also of the
 * get_posts() function. The arguments are combined with the get_children defaults
 * and are then passed to the get_posts() function, which accepts additional arguments.
 * You can replace the defaults in this function, listed below and the additional
 * arguments listed in the get_posts() function.
 *
 * The 'post_parent' is the most important argument and important attention
 * needs to be paid to the $args parameter. If you pass either an object or an
 * integer (number), then just the 'post_parent' is grabbed and everything else
 * is lost. If you don't specify any arguments, then it is assumed that you are
 * in The Loop and the post parent will be grabbed for from the current post.
 *
 * The 'post_parent' argument is the ID to get the children. The 'numberposts'
 * is the amount of posts to retrieve that has a default of '-1', which is
 * used to get all of the posts. Giving a number higher than 0 will only
 * retrieve that amount of posts.
 *
 * The 'post_type' and 'post_status' arguments can be used to choose what
 * criteria of posts to retrieve. The 'post_type' can be anything, but WordPress
 * post types are 'post', 'pages', and 'attachments'. The 'post_status'
 * argument will accept any post status within the write administration panels.
 *
 * @since 2.0.0
 *
 * @see get_posts()
 * @todo Check validity of description.
 *
 * @global WP_Post $post
 *
 * @param mixed  $args   Optional. User defined arguments for replacing the defaults. Default empty.
 * @param string $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
 *                       a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
 * @return array Array of children, where the type of each element is determined by $output parameter.
 *               Empty array on failure.
 */
function get_children( $args = '', $output = OBJECT ) {
	$kids = array();
	if ( empty( $args ) ) {
		if ( isset( $GLOBALS['post'] ) ) {
			$args = array( 'post_parent' => (int) $GLOBALS['post']->post_parent );
		} else {
			return $kids;
		}
	} elseif ( is_object( $args ) ) {
		$args = array( 'post_parent' => (int) $args->post_parent );
	} elseif ( is_numeric( $args ) ) {
		$args = array( 'post_parent' => (int) $args );
	}

	$defaults = array(
		'numberposts' => -1,
		'post_type'   => 'any',
		'post_status' => 'any',
		'post_parent' => 0,
	);

	$r = wp_parse_args( $args, $defaults );

	$children = get_posts( $r );

	if ( ! $children ) {
		return $kids;
	}

	if ( ! empty( $r['fields'] ) ) {
		return $children;
	}

	update_post_cache( $children );

	foreach ( $children as $key => $child ) {
		$kids[ $child->ID ] = $children[ $key ];
	}

	if ( $output == OBJECT ) {
		return $kids;
	} elseif ( $output == ARRAY_A ) {
		$weeuns = array();
		foreach ( (array) $kids as $kid ) {
			$weeuns[ $kid->ID ] = get_object_vars( $kids[ $kid->ID ] );
		}
		return $weeuns;
	} elseif ( $output == ARRAY_N ) {
		$babes = array();
		foreach ( (array) $kids as $kid ) {
			$babes[ $kid->ID ] = array_values( get_object_vars( $kids[ $kid->ID ] ) );
		}
		return $babes;
	} else {
		return $kids;
	}
}

/**
 * Get extended entry info (<!--more-->).
 *
 * There should not be any space after the second dash and before the word
 * 'more'. There can be text or space(s) after the word 'more', but won't be
 * referenced.
 *
 * The returned array has 'main', 'extended', and 'more_text' keys. Main has the text before
 * the `<!--more-->`. The 'extended' key has the content after the
 * `<!--more-->` comment. The 'more_text' key has the custom "Read More" text.
 *
 * @since 1.0.0
 *
 * @param string $post Post content.
 * @return array Post before ('main'), after ('extended'), and custom read more ('more_text').
 */
function get_extended( $post ) {
	//Match the new style more links.
	if ( preg_match( '/<!--more(.*?)?-->/', $post, $matches ) ) {
		list($main, $extended) = explode( $matches[0], $post, 2 );
		$more_text             = $matches[1];
	} else {
		$main      = $post;
		$extended  = '';
		$more_text = '';
	}

	//  leading and trailing whitespace.
	$main      = preg_replace( '/^[\s]*(.*)[\s]*$/', '\\1', $main );
	$extended  = preg_replace( '/^[\s]*(.*)[\s]*$/', '\\1', $extended );
	$more_text = preg_replace( '/^[\s]*(.*)[\s]*$/', '\\1', $more_text );

	return array(
		'main'      => $main,
		'extended'  => $extended,
		'more_text' => $more_text,
	);
}

/**
 * Retrieves post data given a post ID or post object.
 *
 * See sanitize_post() for optional $filter values. Also, the parameter
 * `$post`, must be given as a variable, since it is passed by reference.
 *
 * @since 1.5.1
 *
 * @global WP_Post $post
 *
 * @param int|WP_Post|null $post   Optional. Post ID or post object. Defaults to global $post.
 * @param string           $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
 *                                 a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
 * @param string           $filter Optional. Type of filter to apply. Accepts 'raw', 'edit', 'db',
 *                                 or 'display'. Default 'raw'.
 * @return WP_Post|array|null Type corresponding to $output on success or null on failure.
 *                            When $output is OBJECT, a `WP_Post` instance is returned.
 */
function get_post( $post = null, $output = OBJECT, $filter = 'raw' ) {
	if ( empty( $post ) && isset( $GLOBALS['post'] ) ) {
		$post = $GLOBALS['post'];
	}

	if ( $post instanceof WP_Post ) {
		$_post = $post;
	} elseif ( is_object( $post ) ) {
		if ( empty( $post->filter ) ) {
			$_post = sanitize_post( $post, 'raw' );
			$_post = new WP_Post( $_post );
		} elseif ( 'raw' == $post->filter ) {
			$_post = new WP_Post( $post );
		} else {
			$_post = WP_Post::get_instance( $post->ID );
		}
	} else {
		$_post = WP_Post::get_instance( $post );
	}

	if ( ! $_post ) {
		return null;
	}

	$_post = $_post->filter( $filter );

	if ( $output == ARRAY_A ) {
		return $_post->to_array();
	} elseif ( $output == ARRAY_N ) {
		return array_values( $_post->to_array() );
	}

	return $_post;
}

/**
 * Retrieve ancestors of a post.
 *
 * @since 2.5.0
 *
 * @param int|WP_Post $post Post ID or post object.
 * @return array Ancestor IDs or empty array if none are found.
 */
function get_post_ancestors( $post ) {
	$post = get_post( $post );

	if ( ! $post || empty( $post->post_parent ) || $post->post_parent == $post->ID ) {
		return array();
	}

	$ancestors = array();

	$id = $ancestors[] = $post->post_parent;

	while ( $ancestor = get_post( $id ) ) {
		// Loop detection: If the ancestor has been seen before, break.
		if ( empty( $ancestor->post_parent ) || ( $ancestor->post_parent == $post->ID ) || in_array( $ancestor->post_parent, $ancestors ) ) {
			break;
		}

		$id = $ancestors[] = $ancestor->post_parent;
	}

	return $ancestors;
}

/**
 * Retrieve data from a post field based on Post ID.
 *
 * Examples of the post field will be, 'post_type', 'post_status', 'post_content',
 * etc and based off of the post object property or key names.
 *
 * The context values are based off of the taxonomy filter functions and
 * supported values are found within those functions.
 *
 * @since 2.3.0
 * @since 4.5.0 The `$post` parameter was made optional.
 *
 * @see sanitize_post_field()
 *
 * @param string      $field   Post field name.
 * @param int|WP_Post $post    Optional. Post ID or post object. Defaults to global $post.
 * @param string      $context Optional. How to filter the field. Accepts 'raw', 'edit', 'db',
 *                             or 'display'. Default 'display'.
 * @return string The value of the post field on success, empty string on failure.
 */
function get_post_field( $field, $post = null, $context = 'display' ) {
	$post = get_post( $post );

	if ( ! $post ) {
		return '';
	}

	if ( ! isset( $post->$field ) ) {
		return '';
	}

	return sanitize_post_field( $field, $post->$field, $post->ID, $context );
}

/**
 * Retrieve the mime type of an attachment based on the ID.
 *
 * This function can be used with any post type, but it makes more sense with
 * attachments.
 *
 * @since 2.0.0
 *
 * @param int|WP_Post $post Optional. Post ID or post object. Defaults to global $post.
 * @return string|false The mime type on success, false on failure.
 */
function get_post_mime_type( $post = null ) {
	$post = get_post( $post );

	if ( is_object( $post ) ) {
		return $post->post_mime_type;
	}

	return false;
}

/**
 * Retrieve the post status based on the post ID.
 *
 * If the post ID is of an attachment, then the parent post status will be given
 * instead.
 *
 * @since 2.0.0
 *
 * @param int|WP_Post $post Optional. Post ID or post object. Defaults to global $post..
 * @return string|false Post status on success, false on failure.
 */
function get_post_status( $post = null ) {
	$post = get_post( $post );

	if ( ! is_object( $post ) ) {
		return false;
	}

	if ( 'attachment' == $post->post_type ) {
		if ( 'private' == $post->post_status ) {
			return 'private';
		}

		// Unattached attachments are assumed to be published.
		if ( ( 'inherit' == $post->post_status ) && ( 0 == $post->post_parent ) ) {
			return 'publish';
		}

		// Inherit status from the parent.
		if ( $post->post_parent && ( $post->ID != $post->post_parent ) ) {
			$parent_post_status = get_post_status( $post->post_parent );
			if ( 'trash' == $parent_post_status ) {
				return get_post_meta( $post->post_parent, '_wp_trash_meta_status', true );
			} else {
				return $parent_post_status;
			}
		}
	}

	/**
	 * Filters the post status.
	 *
	 * @since 4.4.0
	 *
	 * @param string  $post_status The post status.
	 * @param WP_Post $post        The post object.
	 */
	return apply_filters( 'get_post_status', $post->post_status, $post );
}

/**
 * Retrieve all of the WordPress supported post statuses.
 *
 * Posts have a limited set of valid status values, this provides the
 * post_status values and descriptions.
 *
 * @since 2.5.0
 *
 * @return array List of post statuses.
 */
function get_post_statuses() {
	$status = array(
		'draft'   => __( 'Draft' ),
		'pending' => __( 'Pending Review' ),
		'private' => __( 'Private' ),
		'publish' => __( 'Published' ),
	);

	return $status;
}

/**
 * Retrieve all of the WordPress support page statuses.
 *
 * Pages have a limited set of valid status values, this provides the
 * post_status values and descriptions.
 *
 * @since 2.5.0
 *
 * @return array List of page statuses.
 */
function get_page_statuses() {
	$status = array(
		'draft'   => __( 'Draft' ),
		'private' => __( 'Private' ),
		'publish' => __( 'Published' ),
	);

	return $status;
}

/**
 * Return statuses for privacy requests.
 *
 * @since 4.9.6
 * @access private
 *
 * @return array
 */
function _wp_privacy_statuses() {
	return array(
		'request-pending'   => __( 'Pending' ),      // Pending confirmation from user.
		'request-confirmed' => __( 'Confirmed' ),    // User has confirmed the action.
		'request-failed'    => __( 'Failed' ),       // User failed to confirm the action.
		'request-completed' => __( 'Completed' ),    // Admin has handled the request.
	);
}

/**
 * Register a post status. Do not use before init.
 *
 * A simple function for creating or modifying a post status based on the
 * parameters given. The function will accept an array (second optional
 * parameter), along with a string for the post status name.
 *
 * Arguments prefixed with an _underscore shouldn't be used by plugins and themes.
 *
 * @since 3.0.0
 * @global array $wp_post_statuses Inserts new post status object into the list
 *
 * @param string $post_status Name of the post status.
 * @param array|string $args {
 *     Optional. Array or string of post status arguments.
 *
 *     @type bool|string $label                     A descriptive name for the post status marked
 *                                                  for translation. Defaults to value of $post_status.
 *     @type bool|array  $label_count               Descriptive text to use for nooped plurals.
 *                                                  Default array of $label, twice
 *     @type bool        $exclude_from_search       Whether to exclude posts with this post status
 *                                                  from search results. Default is value of $internal.
 *     @type bool        $_builtin                  Whether the status is built-in. Core-use only.
 *                                                  Default false.
 *     @type bool        $public                    Whether posts of this status should be shown
 *                                                  in the front end of the site. Default false.
 *     @type bool        $internal                  Whether the status is for internal use only.
 *                                                  Default false.
 *     @type bool        $protected                 Whether posts with this status should be protected.
 *                                                  Default false.
 *     @type bool        $private                   Whether posts with this status should be private.
 *                                                  Default false.
 *     @type bool        $publicly_queryable        Whether posts with this status should be publicly-
 *                                                  queryable. Default is value of $public.
 *     @type bool        $show_in_admin_all_list    Whether to include posts in the edit listing for
 *                                                  their post type. Default is value of $internal.
 *     @type bool        $show_in_admin_status_list Show in the list of statuses with post counts at
 *                                                  the top of the edit listings,
 *                                                  e.g. All (12) | Published (9) | My Custom Status (2)
 *                                                  Default is value of $internal.
 * }
 * @return object
 */
function register_post_status( $post_status, $args = array() ) {
	global $wp_post_statuses;

	if ( ! is_array( $wp_post_statuses ) ) {
		$wp_post_statuses = array();
	}

	// Args prefixed with an underscore are reserved for internal use.
	$defaults = array(
		'label'                     => false,
		'label_count'               => false,
		'exclude_from_search'       => null,
		'_builtin'                  => false,
		'public'                    => null,
		'internal'                  => null,
		'protected'                 => null,
		'private'                   => null,
		'publicly_queryable'        => null,
		'show_in_admin_status_list' => null,
		'show_in_admin_all_list'    => null,
	);
	$args     = wp_parse_args( $args, $defaults );
	$args     = (object) $args;

	$post_status = sanitize_key( $post_status );
	$args->name  = $post_status;

	// Set various defaults.
	if ( null === $args->public && null === $args->internal && null === $args->protected && null === $args->private ) {
		$args->internal = true;
	}

	if ( null === $args->public ) {
		$args->public = false;
	}

	if ( null === $args->private ) {
		$args->private = false;
	}

	if ( null === $args->protected ) {
		$args->protected = false;
	}

	if ( null === $args->internal ) {
		$args->internal = false;
	}

	if ( null === $args->publicly_queryable ) {
		$args->publicly_queryable = $args->public;
	}

	if ( null === $args->exclude_from_search ) {
		$args->exclude_from_search = $args->internal;
	}

	if ( null === $args->show_in_admin_all_list ) {
		$args->show_in_admin_all_list = ! $args->internal;
	}

	if ( null === $args->show_in_admin_status_list ) {
		$args->show_in_admin_status_list = ! $args->internal;
	}

	if ( false === $args->label ) {
		$args->label = $post_status;
	}

	if ( false === $args->label_count ) {
		// phpcs:ignore WordPress.WP.I18n.NonSingularStringLiteralSingle,WordPress.WP.I18n.NonSingularStringLiteralPlural
		$args->label_count = _n_noop( $args->label, $args->label );
	}

	$wp_post_statuses[ $post_status ] = $args;

	return $args;
}

/**
 * Retrieve a post status object by name.
 *
 * @since 3.0.0
 *
 * @global array $wp_post_statuses List of post statuses.
 *
 * @see register_post_status()
 *
 * @param string $post_status The name of a registered post status.
 * @return object|null A post status object.
 */
function get_post_status_object( $post_status ) {
	global $wp_post_statuses;

	if ( empty( $wp_post_statuses[ $post_status ] ) ) {
		return null;
	}

	return $wp_post_statuses[ $post_status ];
}

/**
 * Get a list of post statuses.
 *
 * @since 3.0.0
 *
 * @global array $wp_post_statuses List of post statuses.
 *
 * @see register_post_status()
 *
 * @param array|string $args     Optional. Array or string of post status arguments to compare against
 *                               properties of the global `$wp_post_statuses objects`. Default empty array.
 * @param string       $output   Optional. The type of output to return, either 'names' or 'objects'. Default 'names'.
 * @param string       $operator Optional. The logical operation to perform. 'or' means only one element
 *                               from the array needs to match; 'and' means all elements must match.
 *                               Default 'and'.
 * @return array A list of post status names or objects.
 */
function get_post_stati( $args = array(), $output = 'names', $operator = 'and' ) {
	global $wp_post_statuses;

	$field = ( 'names' == $output ) ? 'name' : false;

	return wp_filter_object_list( $wp_post_statuses, $args, $operator, $field );
}

/**
 * Whether the post type is hierarchical.
 *
 * A false return value might also mean that the post type does not exist.
 *
 * @since 3.0.0
 *
 * @see get_post_type_object()
 *
 * @param string $post_type Post type name
 * @return bool Whether post type is hierarchical.
 */
function is_post_type_hierarchical( $post_type ) {
	if ( ! post_type_exists( $post_type ) ) {
		return false;
	}

	$post_type = get_post_type_object( $post_type );
	return $post_type->hierarchical;
}

/**
 * Determines whether a post type is registered.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 3.0.0
 *
 * @see get_post_type_object()
 *
 * @param string $post_type Post type name.
 * @return bool Whether post type is registered.
 */
function post_type_exists( $post_type ) {
	return (bool) get_post_type_object( $post_type );
}

/**
 * Retrieves the post type of the current post or of a given post.
 *
 * @since 2.1.0
 *
 * @param int|WP_Post|null $post Optional. Post ID or post object. Default is global $post.
 * @return string|false          Post type on success, false on failure.
 */
function get_post_type( $post = null ) {
	if ( $post = get_post( $post ) ) {
		return $post->post_type;
	}

	return false;
}

/**
 * Retrieves a post type object by name.
 *
 * @since 3.0.0
 * @since 4.6.0 Object returned is now an instance of `WP_Post_Type`.
 *
 * @global array $wp_post_types List of post types.
 *
 * @see register_post_type()
 *
 * @param string $post_type The name of a registered post type.
 * @return WP_Post_Type|null WP_Post_Type object if it exists, null otherwise.
 */
function get_post_type_object( $post_type ) {
	global $wp_post_types;

	if ( ! is_scalar( $post_type ) || empty( $wp_post_types[ $post_type ] ) ) {
		return null;
	}

	return $wp_post_types[ $post_type ];
}

/**
 * Get a list of all registered post type objects.
 *
 * @since 2.9.0
 *
 * @global array $wp_post_types List of post types.
 *
 * @see register_post_type() for accepted arguments.
 *
 * @param array|string $args     Optional. An array of key => value arguments to match against
 *                               the post type objects. Default empty array.
 * @param string       $output   Optional. The type of output to return. Accepts post type 'names'
 *                               or 'objects'. Default 'names'.
 * @param string       $operator Optional. The logical operation to perform. 'or' means only one
 *                               element from the array needs to match; 'and' means all elements
 *                               must match; 'not' means no elements may match. Default 'and'.
 * @return string[]|WP_Post_Type[] An array of post type names or objects.
 */
function get_post_types( $args = array(), $output = 'names', $operator = 'and' ) {
	global $wp_post_types;

	$field = ( 'names' == $output ) ? 'name' : false;

	return wp_filter_object_list( $wp_post_types, $args, $operator, $field );
}

/**
 * Registers a post type.
 *
 * Note: Post type registrations should not be hooked before the
 * {@see 'init'} action. Also, any taxonomy connections should be
 * registered via the `$taxonomies` argument to ensure consistency
 * when hooks such as {@see 'parse_query'} or {@see 'pre_get_posts'}
 * are used.
 *
 * Post types can support any number of built-in core features such
 * as meta boxes, custom fields, post thumbnails, post statuses,
 * comments, and more. See the `$supports` argument for a complete
 * list of supported features.
 *
 * @since 2.9.0
 * @since 3.0.0 The `show_ui` argument is now enforced on the new post screen.
 * @since 4.4.0 The `show_ui` argument is now enforced on the post type listing
 *              screen and post editing screen.
 * @since 4.6.0 Post type object returned is now an instance of `WP_Post_Type`.
 * @since 4.7.0 Introduced `show_in_rest`, `rest_base` and `rest_controller_class`
 *              arguments to register the post type in REST API.
 *
 * @global array $wp_post_types List of post types.
 *
 * @param string $post_type Post type key. Must not exceed 20 characters and may
 *                          only contain lowercase alphanumeric characters, dashes,
 *                          and underscores. See sanitize_key().
 * @param array|string $args {
 *     Array or string of arguments for registering a post type.
 *
 *     @type string      $label                 Name of the post type shown in the menu. Usually plural.
 *                                              Default is value of $labels['name'].
 *     @type array       $labels                An array of labels for this post type. If not set, post
 *                                              labels are inherited for non-hierarchical types and page
 *                                              labels for hierarchical ones. See get_post_type_labels() for a full
 *                                              list of supported labels.
 *     @type string      $description           A short descriptive summary of what the post type is.
 *                                              Default empty.
 *     @type bool        $public                Whether a post type is intended for use publicly either via
 *                                              the admin interface or by front-end users. While the default
 *                                              settings of $exclude_from_search, $publicly_queryable, $show_ui,
 *                                              and $show_in_nav_menus are inherited from public, each does not
 *                                              rely on this relationship and controls a very specific intention.
 *                                              Default false.
 *     @type bool        $hierarchical          Whether the post type is hierarchical (e.g. page). Default false.
 *     @type bool        $exclude_from_search   Whether to exclude posts with this post type from front end search
 *                                              results. Default is the opposite value of $public.
 *     @type bool        $publicly_queryable    Whether queries can be performed on the front end for the post type
 *                                              as part of parse_request(). Endpoints would include:
 *                                              * ?post_type={post_type_key}
 *                                              * ?{post_type_key}={single_post_slug}
 *                                              * ?{post_type_query_var}={single_post_slug}
 *                                              If not set, the default is inherited from $public.
 *     @type bool        $show_ui               Whether to generate and allow a UI for managing this post type in the
 *                                              admin. Default is value of $public.
 *     @type bool        $show_in_menu          Where to show the post type in the admin menu. To work, $show_ui
 *                                              must be true. If true, the post type is shown in its own top level
 *                                              menu. If false, no menu is shown. If a string of an existing top
 *                                              level menu (eg. 'tools.php' or 'edit.php?post_type=page'), the post
 *                                              type will be placed as a sub-menu of that.
 *                                              Default is value of $show_ui.
 *     @type bool        $show_in_nav_menus     Makes this post type available for selection in navigation menus.
 *                                              Default is value $public.
 *     @type bool        $show_in_admin_bar     Makes this post type available via the admin bar. Default is value
 *                                              of $show_in_menu.
 *     @type bool        $show_in_rest          Whether to add the post type route in the REST API 'wp/v2' namespace.
 *     @type string      $rest_base             To change the base url of REST API route. Default is $post_type.
 *     @type string      $rest_controller_class REST API Controller class name. Default is 'WP_REST_Posts_Controller'.
 *     @type int         $menu_position         The position in the menu order the post type should appear. To work,
 *                                              $show_in_menu must be true. Default null (at the bottom).
 *     @type string      $menu_icon             The url to the icon to be used for this menu. Pass a base64-encoded
 *                                              SVG using a data URI, which will be colored to match the color scheme
 *                                              -- this should begin with 'data:image/svg+xml;base64,'. Pass the name
 *                                              of a Dashicons helper class to use a font icon, e.g.
 *                                              'dashicons-chart-pie'. Pass 'none' to leave div.wp-menu-image empty
 *                                              so an icon can be added via CSS. Defaults to use the posts icon.
 *     @type string      $capability_type       The string to use to build the read, edit, and delete capabilities.
 *                                              May be passed as an array to allow for alternative plurals when using
 *                                              this argument as a base to construct the capabilities, e.g.
 *                                              array('story', 'stories'). Default 'post'.
 *     @type array       $capabilities          Array of capabilities for this post type. $capability_type is used
 *                                              as a base to construct capabilities by default.
 *                                              See get_post_type_capabilities().
 *     @type bool        $map_meta_cap          Whether to use the internal default meta capability handling.
 *                                              Default false.
 *     @type array       $supports              Core feature(s) the post type supports. Serves as an alias for calling
 *                                              add_post_type_support() directly. Core features include 'title',
 *                                              'editor', 'comments', 'revisions', 'trackbacks', 'author', 'excerpt',
 *                                              'page-attributes', 'thumbnail', 'custom-fields', and 'post-formats'.
 *                                              Additionally, the 'revisions' feature dictates whether the post type
 *                                              will store revisions, and the 'comments' feature dictates whether the
 *                                              comments count will show on the edit screen. Defaults is an array
 *                                              containing 'title' and 'editor'.
 *     @type callable    $register_meta_box_cb  Provide a callback function that sets up the meta boxes for the
 *                                              edit form. Do remove_meta_box() and add_meta_box() calls in the
 *                                              callback. Default null.
 *     @type array       $taxonomies            An array of taxonomy identifiers that will be registered for the
 *                                              post type. Taxonomies can be registered later with register_taxonomy()
 *                                              or register_taxonomy_for_object_type().
 *                                              Default empty array.
 *     @type bool|string $has_archive           Whether there should be post type archives, or if a string, the
 *                                              archive slug to use. Will generate the proper rewrite rules if
 *                                              $rewrite is enabled. Default false.
 *     @type bool|array  $rewrite              {
 *         Triggers the handling of rewrites for this post type. To prevent rewrite, set to false.
 *         Defaults to true, using $post_type as slug. To specify rewrite rules, an array can be
 *         passed with any of these keys:
 *
 *         @type string $slug       Customize the permastruct slug. Defaults to $post_type key.
 *         @type bool   $with_front Whether the permastruct should be prepended with WP_Rewrite::$front.
 *                                  Default true.
 *         @type bool   $feeds      Whether the feed permastruct should be built for this post type.
 *                                  Default is value of $has_archive.
 *         @type bool   $pages      Whether the permastruct should provide for pagination. Default true.
 *         @type const  $ep_mask    Endpoint mask to assign. If not specified and permalink_epmask is set,
 *                                  inherits from $permalink_epmask. If not specified and permalink_epmask
 *                                  is not set, defaults to EP_PERMALINK.
 *     }
 *     @type string|bool $query_var             Sets the query_var key for this post type. Defaults to $post_type
 *                                              key. If false, a post type cannot be loaded at
 *                                              ?{query_var}={post_slug}. If specified as a string, the query
 *                                              ?{query_var_string}={post_slug} will be valid.
 *     @type bool        $can_export            Whether to allow this post type to be exported. Default true.
 *     @type bool        $delete_with_user      Whether to delete posts of this type when deleting a user. If true,
 *                                              posts of this type belonging to the user will be moved to trash
 *                                              when then user is deleted. If false, posts of this type belonging
 *                                              to the user will *not* be trashed or deleted. If not set (the default),
 *                                              posts are trashed if post_type_supports('author'). Otherwise posts
 *                                              are not trashed or deleted. Default null.
 *     @type bool        $_builtin              FOR INTERNAL USE ONLY! True if this post type is a native or
 *                                              "built-in" post_type. Default false.
 *     @type string      $_edit_link            FOR INTERNAL USE ONLY! URL segment to use for edit link of
 *                                              this post type. Default 'post.php?post=%d'.
 * }
 * @return WP_Post_Type|WP_Error The registered post type object, or an error object.
 */
function register_post_type( $post_type, $args = array() ) {
	global $wp_post_types;

	if ( ! is_array( $wp_post_types ) ) {
		$wp_post_types = array();
	}

	// Sanitize post type name
	$post_type = sanitize_key( $post_type );

	if ( empty( $post_type ) || strlen( $post_type ) > 20 ) {
		_doing_it_wrong( __FUNCTION__, __( 'Post type names must be between 1 and 20 characters in length.' ), '4.2.0' );
		return new WP_Error( 'post_type_length_invalid', __( 'Post type names must be between 1 and 20 characters in length.' ) );
	}

	$post_type_object = new WP_Post_Type( $post_type, $args );
	$post_type_object->add_supports();
	$post_type_object->add_rewrite_rules();
	$post_type_object->register_meta_boxes();

	$wp_post_types[ $post_type ] = $post_type_object;

	$post_type_object->add_hooks();
	$post_type_object->register_taxonomies();

	/**
	 * Fires after a post type is registered.
	 *
	 * @since 3.3.0
	 * @since 4.6.0 Converted the `$post_type` parameter to accept a `WP_Post_Type` object.
	 *
	 * @param string       $post_type        Post type.
	 * @param WP_Post_Type $post_type_object Arguments used to register the post type.
	 */
	do_action( 'registered_post_type', $post_type, $post_type_object );

	return $post_type_object;
}

/**
 * Unregisters a post type.
 *
 * Can not be used to unregister built-in post types.
 *
 * @since 4.5.0
 *
 * @global array $wp_post_types List of post types.
 *
 * @param string $post_type Post type to unregister.
 * @return bool|WP_Error True on success, WP_Error on failure or if the post type doesn't exist.
 */
function unregister_post_type( $post_type ) {
	global $wp_post_types;

	if ( ! post_type_exists( $post_type ) ) {
		return new WP_Error( 'invalid_post_type', __( 'Invalid post type.' ) );
	}

	$post_type_object = get_post_type_object( $post_type );

	// Do not allow unregistering internal post types.
	if ( $post_type_object->_builtin ) {
		return new WP_Error( 'invalid_post_type', __( 'Unregistering a built-in post type is not allowed' ) );
	}

	$post_type_object->remove_supports();
	$post_type_object->remove_rewrite_rules();
	$post_type_object->unregister_meta_boxes();
	$post_type_object->remove_hooks();
	$post_type_object->unregister_taxonomies();

	unset( $wp_post_types[ $post_type ] );

	/**
	 * Fires after a post type was unregistered.
	 *
	 * @since 4.5.0
	 *
	 * @param string $post_type Post type key.
	 */
	do_action( 'unregistered_post_type', $post_type );

	return true;
}

/**
 * Build an object with all post type capabilities out of a post type object
 *
 * Post type capabilities use the 'capability_type' argument as a base, if the
 * capability is not set in the 'capabilities' argument array or if the
 * 'capabilities' argument is not supplied.
 *
 * The capability_type argument can optionally be registered as an array, with
 * the first value being singular and the second plural, e.g. array('story, 'stories')
 * Otherwise, an 's' will be added to the value for the plural form. After
 * registration, capability_type will always be a string of the singular value.
 *
 * By default, seven keys are accepted as part of the capabilities array:
 *
 * - edit_post, read_post, and delete_post are meta capabilities, which are then
 *   generally mapped to corresponding primitive capabilities depending on the
 *   context, which would be the post being edited/read/deleted and the user or
 *   role being checked. Thus these capabilities would generally not be granted
 *   directly to users or roles.
 *
 * - edit_posts - Controls whether objects of this post type can be edited.
 * - edit_others_posts - Controls whether objects of this type owned by other users
 *   can be edited. If the post type does not support an author, then this will
 *   behave like edit_posts.
 * - publish_posts - Controls publishing objects of this post type.
 * - read_private_posts - Controls whether private objects can be read.
 *
 * These four primitive capabilities are checked in core in various locations.
 * There are also seven other primitive capabilities which are not referenced
 * directly in core, except in map_meta_cap(), which takes the three aforementioned
 * meta capabilities and translates them into one or more primitive capabilities
 * that must then be checked against the user or role, depending on the context.
 *
 * - read - Controls whether objects of this post type can be read.
 * - delete_posts - Controls whether objects of this post type can be deleted.
 * - delete_private_posts - Controls whether private objects can be deleted.
 * - delete_published_posts - Controls whether published objects can be deleted.
 * - delete_others_posts - Controls whether objects owned by other users can be
 *   can be deleted. If the post type does not support an author, then this will
 *   behave like delete_posts.
 * - edit_private_posts - Controls whether private objects can be edited.
 * - edit_published_posts - Controls whether published objects can be edited.
 *
 * These additional capabilities are only used in map_meta_cap(). Thus, they are
 * only assigned by default if the post type is registered with the 'map_meta_cap'
 * argument set to true (default is false).
 *
 * @since 3.0.0
 *
 * @see register_post_type()
 * @see map_meta_cap()
 *
 * @param object $args Post type registration arguments.
 * @return object Object with all the capabilities as member variables.
 */
function get_post_type_capabilities( $args ) {
	if ( ! is_array( $args->capability_type ) ) {
		$args->capability_type = array( $args->capability_type, $args->capability_type . 's' );
	}

	// Singular base for meta capabilities, plural base for primitive capabilities.
	list( $singular_base, $plural_base ) = $args->capability_type;

	$default_capabilities = array(
		// Meta capabilities
		'edit_post'          => 'edit_' . $singular_base,
		'read_post'          => 'read_' . $singular_base,
		'delete_post'        => 'delete_' . $singular_base,
		// Primitive capabilities used outside of map_meta_cap():
		'edit_posts'         => 'edit_' . $plural_base,
		'edit_others_posts'  => 'edit_others_' . $plural_base,
		'publish_posts'      => 'publish_' . $plural_base,
		'read_private_posts' => 'read_private_' . $plural_base,
	);

	// Primitive capabilities used within map_meta_cap():
	if ( $args->map_meta_cap ) {
		$default_capabilities_for_mapping = array(
			'read'                   => 'read',
			'delete_posts'           => 'delete_' . $plural_base,
			'delete_private_posts'   => 'delete_private_' . $plural_base,
			'delete_published_posts' => 'delete_published_' . $plural_base,
			'delete_others_posts'    => 'delete_others_' . $plural_base,
			'edit_private_posts'     => 'edit_private_' . $plural_base,
			'edit_published_posts'   => 'edit_published_' . $plural_base,
		);
		$default_capabilities             = array_merge( $default_capabilities, $default_capabilities_for_mapping );
	}

	$capabilities = array_merge( $default_capabilities, $args->capabilities );

	// Post creation capability simply maps to edit_posts by default:
	if ( ! isset( $capabilities['create_posts'] ) ) {
		$capabilities['create_posts'] = $capabilities['edit_posts'];
	}

	// Remember meta capabilities for future reference.
	if ( $args->map_meta_cap ) {
		_post_type_meta_capabilities( $capabilities );
	}

	return (object) $capabilities;
}

/**
 * Store or return a list of post type meta caps for map_meta_cap().
 *
 * @since 3.1.0
 * @access private
 *
 * @global array $post_type_meta_caps Used to store meta capabilities.
 *
 * @param array $capabilities Post type meta capabilities.
 */
function _post_type_meta_capabilities( $capabilities = null ) {
	global $post_type_meta_caps;

	foreach ( $capabilities as $core => $custom ) {
		if ( in_array( $core, array( 'read_post', 'delete_post', 'edit_post' ) ) ) {
			$post_type_meta_caps[ $custom ] = $core;
		}
	}
}

/**
 * Builds an object with all post type labels out of a post type object.
 *
 * Accepted keys of the label array in the post type object:
 *
 * - `name` - General name for the post type, usually plural. The same and overridden
 *          by `$post_type_object->label`. Default is 'Posts' / 'Pages'.
 * - `singular_name` - Name for one object of this post type. Default is 'Post' / 'Page'.
 * - `add_new` - Default is 'Add New' for both hierarchical and non-hierarchical types.
 *             When internationalizing this string, please use a {@link https://codex.wordpress.org/I18n_for_WordPress_Developers#Disambiguation_by_context gettext context}
 *             matching your post type. Example: `_x( 'Add New', 'product', 'textdomain' );`.
 * - `add_new_item` - Label for adding a new singular item. Default is 'Add New Post' / 'Add New Page'.
 * - `edit_item` - Label for editing a singular item. Default is 'Edit Post' / 'Edit Page'.
 * - `new_item` - Label for the new item page title. Default is 'New Post' / 'New Page'.
 * - `view_item` - Label for viewing a singular item. Default is 'View Post' / 'View Page'.
 * - `view_items` - Label for viewing post type archives. Default is 'View Posts' / 'View Pages'.
 * - `search_items` - Label for searching plural items. Default is 'Search Posts' / 'Search Pages'.
 * - `not_found` - Label used when no items are found. Default is 'No posts found' / 'No pages found'.
 * - `not_found_in_trash` - Label used when no items are in the trash. Default is 'No posts found in Trash' /
 *                        'No pages found in Trash'.
 * - `parent_item_colon` - Label used to prefix parents of hierarchical items. Not used on non-hierarchical
 *                       post types. Default is 'Parent Page:'.
 * - `all_items` - Label to signify all items in a submenu link. Default is 'All Posts' / 'All Pages'.
 * - `archives` - Label for archives in nav menus. Default is 'Post Archives' / 'Page Archives'.
 * - `attributes` - Label for the attributes meta box. Default is 'Post Attributes' / 'Page Attributes'.
 * - `insert_into_item` - Label for the media frame button. Default is 'Insert into post' / 'Insert into page'.
 * - `uploaded_to_this_item` - Label for the media frame filter. Default is 'Uploaded to this post' /
 *                           'Uploaded to this page'.
 * - `featured_image` - Label for the Featured Image meta box title. Default is 'Featured Image'.
 * - `set_featured_image` - Label for setting the featured image. Default is 'Set featured image'.
 * - `remove_featured_image` - Label for removing the featured image. Default is 'Remove featured image'.
 * - `use_featured_image` - Label in the media frame for using a featured image. Default is 'Use as featured image'.
 * - `menu_name` - Label for the menu name. Default is the same as `name`.
 * - `filter_items_list` - Label for the table views hidden heading. Default is 'Filter posts list' /
 *                       'Filter pages list'.
 * - `items_list_navigation` - Label for the table pagination hidden heading. Default is 'Posts list navigation' /
 *                           'Pages list navigation'.
 * - `items_list` - Label for the table hidden heading. Default is 'Posts list' / 'Pages list'.
 * - `item_published` - Label used when an item is published. Default is 'Post published.' / 'Page published.'
 * - `item_published_privately` - Label used when an item is published with private visibility.
 *                              Default is 'Post published privately.' / 'Page published privately.'
 * - `item_reverted_to_draft` - Label used when an item is switched to a draft.
 *                            Default is 'Post reverted to draft.' / 'Page reverted to draft.'
 * - `item_scheduled` - Label used when an item is scheduled for publishing. Default is 'Post scheduled.' /
 *                    'Page scheduled.'
 * - `item_updated` - Label used when an item is updated. Default is 'Post updated.' / 'Page updated.'
 *
 * Above, the first default value is for non-hierarchical post types (like posts)
 * and the second one is for hierarchical post types (like pages).
 *
 * Note: To set labels used in post type admin notices, see the {@see 'post_updated_messages'} filter.
 *
 * @since 3.0.0
 * @since 4.3.0 Added the `featured_image`, `set_featured_image`, `remove_featured_image`,
 *              and `use_featured_image` labels.
 * @since 4.4.0 Added the `archives`, `insert_into_item`, `uploaded_to_this_item`, `filter_items_list`,
 *              `items_list_navigation`, and `items_list` labels.
 * @since 4.6.0 Converted the `$post_type` parameter to accept a `WP_Post_Type` object.
 * @since 4.7.0 Added the `view_items` and `attributes` labels.
 * @since 5.0.0 Added the `item_published`, `item_published_privately`, `item_reverted_to_draft`,
 *              `item_scheduled`, and `item_updated` labels.
 *
 * @access private
 *
 * @param object|WP_Post_Type $post_type_object Post type object.
 * @return object Object with all the labels as member variables.
 */
function get_post_type_labels( $post_type_object ) {
	$nohier_vs_hier_defaults              = array(
		'name'                     => array( _x( 'Posts', 'post type general name' ), _x( 'Pages', 'post type general name' ) ),
		'singular_name'            => array( _x( 'Post', 'post type singular name' ), _x( 'Page', 'post type singular name' ) ),
		'add_new'                  => array( _x( 'Add New', 'post' ), _x( 'Add New', 'page' ) ),
		'add_new_item'             => array( __( 'Add New Post' ), __( 'Add New Page' ) ),
		'edit_item'                => array( __( 'Edit Post' ), __( 'Edit Page' ) ),
		'new_item'                 => array( __( 'New Post' ), __( 'New Page' ) ),
		'view_item'                => array( __( 'View Post' ), __( 'View Page' ) ),
		'view_items'               => array( __( 'View Posts' ), __( 'View Pages' ) ),
		'search_items'             => array( __( 'Search Posts' ), __( 'Search Pages' ) ),
		'not_found'                => array( __( 'No posts found.' ), __( 'No pages found.' ) ),
		'not_found_in_trash'       => array( __( 'No posts found in Trash.' ), __( 'No pages found in Trash.' ) ),
		'parent_item_colon'        => array( null, __( 'Parent Page:' ) ),
		'all_items'                => array( __( 'All Posts' ), __( 'All Pages' ) ),
		'archives'                 => array( __( 'Post Archives' ), __( 'Page Archives' ) ),
		'attributes'               => array( __( 'Post Attributes' ), __( 'Page Attributes' ) ),
		'insert_into_item'         => array( __( 'Insert into post' ), __( 'Insert into page' ) ),
		'uploaded_to_this_item'    => array( __( 'Uploaded to this post' ), __( 'Uploaded to this page' ) ),
		'featured_image'           => array( _x( 'Featured Image', 'post' ), _x( 'Featured Image', 'page' ) ),
		'set_featured_image'       => array( _x( 'Set featured image', 'post' ), _x( 'Set featured image', 'page' ) ),
		'remove_featured_image'    => array( _x( 'Remove featured image', 'post' ), _x( 'Remove featured image', 'page' ) ),
		'use_featured_image'       => array( _x( 'Use as featured image', 'post' ), _x( 'Use as featured image', 'page' ) ),
		'filter_items_list'        => array( __( 'Filter posts list' ), __( 'Filter pages list' ) ),
		'items_list_navigation'    => array( __( 'Posts list navigation' ), __( 'Pages list navigation' ) ),
		'items_list'               => array( __( 'Posts list' ), __( 'Pages list' ) ),
		'item_published'           => array( __( 'Post published.' ), __( 'Page published.' ) ),
		'item_published_privately' => array( __( 'Post published privately.' ), __( 'Page published privately.' ) ),
		'item_reverted_to_draft'   => array( __( 'Post reverted to draft.' ), __( 'Page reverted to draft.' ) ),
		'item_scheduled'           => array( __( 'Post scheduled.' ), __( 'Page scheduled.' ) ),
		'item_updated'             => array( __( 'Post updated.' ), __( 'Page updated.' ) ),
	);
	$nohier_vs_hier_defaults['menu_name'] = $nohier_vs_hier_defaults['name'];

	$labels = _get_custom_object_labels( $post_type_object, $nohier_vs_hier_defaults );

	$post_type = $post_type_object->name;

	$default_labels = clone $labels;

	/**
	 * Filters the labels of a specific post type.
	 *
	 * The dynamic portion of the hook name, `$post_type`, refers to
	 * the post type slug.
	 *
	 * @since 3.5.0
	 *
	 * @see get_post_type_labels() for the full list of labels.
	 *
	 * @param object $labels Object with labels for the post type as member variables.
	 */
	$labels = apply_filters( "post_type_labels_{$post_type}", $labels );

	// Ensure that the filtered labels contain all required default values.
	$labels = (object) array_merge( (array) $default_labels, (array) $labels );

	return $labels;
}

/**
 * Build an object with custom-something object (post type, taxonomy) labels
 * out of a custom-something object
 *
 * @since 3.0.0
 * @access private
 *
 * @param object $object                  A custom-something object.
 * @param array  $nohier_vs_hier_defaults Hierarchical vs non-hierarchical default labels.
 * @return object Object containing labels for the given custom-something object.
 */
function _get_custom_object_labels( $object, $nohier_vs_hier_defaults ) {
	$object->labels = (array) $object->labels;

	if ( isset( $object->label ) && empty( $object->labels['name'] ) ) {
		$object->labels['name'] = $object->label;
	}

	if ( ! isset( $object->labels['singular_name'] ) && isset( $object->labels['name'] ) ) {
		$object->labels['singular_name'] = $object->labels['name'];
	}

	if ( ! isset( $object->labels['name_admin_bar'] ) ) {
		$object->labels['name_admin_bar'] = isset( $object->labels['singular_name'] ) ? $object->labels['singular_name'] : $object->name;
	}

	if ( ! isset( $object->labels['menu_name'] ) && isset( $object->labels['name'] ) ) {
		$object->labels['menu_name'] = $object->labels['name'];
	}

	if ( ! isset( $object->labels['all_items'] ) && isset( $object->labels['menu_name'] ) ) {
		$object->labels['all_items'] = $object->labels['menu_name'];
	}

	if ( ! isset( $object->labels['archives'] ) && isset( $object->labels['all_items'] ) ) {
		$object->labels['archives'] = $object->labels['all_items'];
	}

	$defaults = array();
	foreach ( $nohier_vs_hier_defaults as $key => $value ) {
		$defaults[ $key ] = $object->hierarchical ? $value[1] : $value[0];
	}
	$labels         = array_merge( $defaults, $object->labels );
	$object->labels = (object) $object->labels;

	return (object) $labels;
}

/**
 * Add submenus for post types.
 *
 * @access private
 * @since 3.1.0
 */
function _add_post_type_submenus() {
	foreach ( get_post_types( array( 'show_ui' => true ) ) as $ptype ) {
		$ptype_obj = get_post_type_object( $ptype );
		// Sub-menus only.
		if ( ! $ptype_obj->show_in_menu || $ptype_obj->show_in_menu === true ) {
			continue;
		}
		add_submenu_page( $ptype_obj->show_in_menu, $ptype_obj->labels->name, $ptype_obj->labels->all_items, $ptype_obj->cap->edit_posts, "edit.php?post_type=$ptype" );
	}
}

/**
 * Register support of certain features for a post type.
 *
 * All core features are directly associated with a functional area of the edit
 * screen, such as the editor or a meta box. Features include: 'title', 'editor',
 * 'comments', 'revisions', 'trackbacks', 'author', 'excerpt', 'page-attributes',
 * 'thumbnail', 'custom-fields', and 'post-formats'.
 *
 * Additionally, the 'revisions' feature dictates whether the post type will
 * store revisions, and the 'comments' feature dictates whether the comments
 * count will show on the edit screen.
 *
 * @since 3.0.0
 *
 * @global array $_wp_post_type_features
 *
 * @param string       $post_type The post type for which to add the feature.
 * @param string|array $feature   The feature being added, accepts an array of
 *                                feature strings or a single string.
 */
function add_post_type_support( $post_type, $feature ) {
	global $_wp_post_type_features;

	$features = (array) $feature;
	foreach ( $features as $feature ) {
		if ( func_num_args() == 2 ) {
			$_wp_post_type_features[ $post_type ][ $feature ] = true;
		} else {
			$_wp_post_type_features[ $post_type ][ $feature ] = array_slice( func_get_args(), 2 );
		}
	}
}

/**
 * Remove support for a feature from a post type.
 *
 * @since 3.0.0
 *
 * @global array $_wp_post_type_features
 *
 * @param string $post_type The post type for which to remove the feature.
 * @param string $feature   The feature being removed.
 */
function remove_post_type_support( $post_type, $feature ) {
	global $_wp_post_type_features;

	unset( $_wp_post_type_features[ $post_type ][ $feature ] );
}

/**
 * Get all the post type features
 *
 * @since 3.4.0
 *
 * @global array $_wp_post_type_features
 *
 * @param string $post_type The post type.
 * @return array Post type supports list.
 */
function get_all_post_type_supports( $post_type ) {
	global $_wp_post_type_features;

	if ( isset( $_wp_post_type_features[ $post_type ] ) ) {
		return $_wp_post_type_features[ $post_type ];
	}

	return array();
}

/**
 * Check a post type's support for a given feature.
 *
 * @since 3.0.0
 *
 * @global array $_wp_post_type_features
 *
 * @param string $post_type The post type being checked.
 * @param string $feature   The feature being checked.
 * @return bool Whether the post type supports the given feature.
 */
function post_type_supports( $post_type, $feature ) {
	global $_wp_post_type_features;

	return ( isset( $_wp_post_type_features[ $post_type ][ $feature ] ) );
}

/**
 * Retrieves a list of post type names that support a specific feature.
 *
 * @since 4.5.0
 *
 * @global array $_wp_post_type_features Post type features
 *
 * @param array|string $feature  Single feature or an array of features the post types should support.
 * @param string       $operator Optional. The logical operation to perform. 'or' means
 *                               only one element from the array needs to match; 'and'
 *                               means all elements must match; 'not' means no elements may
 *                               match. Default 'and'.
 * @return array A list of post type names.
 */
function get_post_types_by_support( $feature, $operator = 'and' ) {
	global $_wp_post_type_features;

	$features = array_fill_keys( (array) $feature, true );

	return array_keys( wp_filter_object_list( $_wp_post_type_features, $features, $operator ) );
}

/**
 * Update the post type for the post ID.
 *
 * The page or post cache will be cleaned for the post ID.
 *
 * @since 2.5.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int    $post_id   Optional. Post ID to change post type. Default 0.
 * @param string $post_type Optional. Post type. Accepts 'post' or 'page' to
 *                          name a few. Default 'post'.
 * @return int|false Amount of rows changed. Should be 1 for success and 0 for failure.
 */
function set_post_type( $post_id = 0, $post_type = 'post' ) {
	global $wpdb;

	$post_type = sanitize_post_field( 'post_type', $post_type, $post_id, 'db' );
	$return    = $wpdb->update( $wpdb->posts, array( 'post_type' => $post_type ), array( 'ID' => $post_id ) );

	clean_post_cache( $post_id );

	return $return;
}

/**
 * Determines whether a post type is considered "viewable".
 *
 * For built-in post types such as posts and pages, the 'public' value will be evaluated.
 * For all others, the 'publicly_queryable' value will be used.
 *
 * @since 4.4.0
 * @since 4.5.0 Added the ability to pass a post type name in addition to object.
 * @since 4.6.0 Converted the `$post_type` parameter to accept a `WP_Post_Type` object.
 * @since 5.9.0 Added `is_post_type_viewable` hook to filter the result.
 *
 * @param string|WP_Post_Type $post_type Post type name or object.
 * @return bool Whether the post type should be considered viewable.
 */
function is_post_type_viewable( $post_type ) {
	if ( is_scalar( $post_type ) ) {
		$post_type = get_post_type_object( $post_type );

		if ( ! $post_type ) {
			return false;
		}
	}

	if ( ! is_object( $post_type ) ) {
		return false;
	}

	$is_viewable = $post_type->publicly_queryable || ( $post_type->_builtin && $post_type->public );

	/**
	 * Filters whether a post type is considered "viewable".
	 *
	 * The returned filtered value must be a boolean type to ensure
	 * `is_post_type_viewable()` only returns a boolean. This strictness
	 * is by design to maintain backwards-compatibility and guard against
	 * potential type errors in PHP 8.1+. Non-boolean values (even falsey
	 * and truthy values) will result in the function returning false.
	 *
	 * @since 5.9.0
	 *
	 * @param bool         $is_viewable Whether the post type is "viewable" (strict type).
	 * @param WP_Post_Type $post_type   Post type object.
	 */
	return true === apply_filters( 'is_post_type_viewable', $is_viewable, $post_type );
}

/**
 * Determines whether a post status is considered "viewable".
 *
 * For built-in post statuses such as publish and private, the 'public' value will be evaluated.
 * For all others, the 'publicly_queryable' value will be used.
 *
 * @since 5.7.0
 * @since 5.9.0 Added `is_post_status_viewable` hook to filter the result.
 *
 * @param string|stdClass $post_status Post status name or object.
 * @return bool Whether the post status should be considered viewable.
 */
function is_post_status_viewable( $post_status ) {
	if ( is_scalar( $post_status ) ) {
		$post_status = get_post_status_object( $post_status );

		if ( ! $post_status ) {
			return false;
		}
	}

	if (
		! is_object( $post_status ) ||
		$post_status->internal ||
		$post_status->protected
	) {
		return false;
	}

	$is_viewable = $post_status->publicly_queryable || ( $post_status->_builtin && $post_status->public );

	/**
	 * Filters whether a post status is considered "viewable".
	 *
	 * The returned filtered value must be a boolean type to ensure
	 * `is_post_status_viewable()` only returns a boolean. This strictness
	 * is by design to maintain backwards-compatibility and guard against
	 * potential type errors in PHP 8.1+. Non-boolean values (even falsey
	 * and truthy values) will result in the function returning false.
	 *
	 * @since 5.9.0
	 *
	 * @param bool     $is_viewable Whether the post status is "viewable" (strict type).
	 * @param stdClass $post_status Post status object.
	 */
	return true === apply_filters( 'is_post_status_viewable', $is_viewable, $post_status );
}

/**
 * Determines whether a post is publicly viewable.
 *
 * Posts are considered publicly viewable if both the post status and post type
 * are viewable.
 *
 * @since 5.7.0
 *
 * @param int|WP_Post|null $post Optional. Post ID or post object. Defaults to global $post.
 * @return bool Whether the post is publicly viewable.
 */
function is_post_publicly_viewable( $post = null ) {
	$post = get_post( $post );

	if ( ! $post ) {
		return false;
	}

	$post_type   = get_post_type( $post );
	$post_status = get_post_status( $post );

	return is_post_type_viewable( $post_type ) && is_post_status_viewable( $post_status );
}

/**
 * Retrieves an array of the latest posts, or posts matching the given criteria.
 *
 * The defaults are as follows:
 *
 * @since 1.2.0
 *
 * @see WP_Query::parse_query()
 *
 * @param array $args {
 *     Optional. Arguments to retrieve posts. See WP_Query::parse_query() for all
 *     available arguments.
 *
 *     @type int        $numberposts      Total number of posts to retrieve. Is an alias of $posts_per_page
 *                                        in WP_Query. Accepts -1 for all. Default 5.
 *     @type int|string $category         Category ID or comma-separated list of IDs (this or any children).
 *                                        Is an alias of $cat in WP_Query. Default 0.
 *     @type array      $include          An array of post IDs to retrieve, sticky posts will be included.
 *                                        Is an alias of $post__in in WP_Query. Default empty array.
 *     @type array      $exclude          An array of post IDs not to retrieve. Default empty array.
 *     @type bool       $suppress_filters Whether to suppress filters. Default true.
 * }
 * @return WP_Post[]|int[] Array of post objects or post IDs.
 */
function get_posts( $args = null ) {
	$defaults = array(
		'numberposts'      => 5,
		'category'         => 0,
		'orderby'          => 'date',
		'order'            => 'DESC',
		'include'          => array(),
		'exclude'          => array(),
		'meta_key'         => '',
		'meta_value'       => '',
		'post_type'        => 'post',
		'suppress_filters' => true,
	);

	$r = wp_parse_args( $args, $defaults );
	if ( empty( $r['post_status'] ) ) {
		$r['post_status'] = ( 'attachment' == $r['post_type'] ) ? 'inherit' : 'publish';
	}
	if ( ! empty( $r['numberposts'] ) && empty( $r['posts_per_page'] ) ) {
		$r['posts_per_page'] = $r['numberposts'];
	}
	if ( ! empty( $r['category'] ) ) {
		$r['cat'] = $r['category'];
	}
	if ( ! empty( $r['include'] ) ) {
		$incposts            = wp_parse_id_list( $r['include'] );
		$r['posts_per_page'] = count( $incposts );  // only the number of posts included
		$r['post__in']       = $incposts;
	} elseif ( ! empty( $r['exclude'] ) ) {
		$r['post__not_in'] = wp_parse_id_list( $r['exclude'] );
	}

	$r['ignore_sticky_posts'] = true;
	$r['no_found_rows']       = true;

	$get_posts = new WP_Query;
	return $get_posts->query( $r );

}

//
// Post meta functions
//

/**
 * Adds a meta field to the given post.
 *
 * Post meta data is called "Custom Fields" on the Administration Screen.
 *
 * @since 1.5.0
 *
 * @param int    $post_id    Post ID.
 * @param string $meta_key   Metadata name.
 * @param mixed  $meta_value Metadata value. Must be serializable if non-scalar.
 * @param bool   $unique     Optional. Whether the same key should not be added.
 *                           Default false.
 * @return int|false Meta ID on success, false on failure.
 */
function add_post_meta( $post_id, $meta_key, $meta_value, $unique = false ) {
	// Make sure meta is added to the post, not a revision.
	$the_post = wp_is_post_revision( $post_id );
	if ( $the_post ) {
		$post_id = $the_post;
	}

	return add_metadata( 'post', $post_id, $meta_key, $meta_value, $unique );
}

/**
 * Deletes a post meta field for the given post ID.
 *
 * You can match based on the key, or key and value. Removing based on key and
 * value, will keep from removing duplicate metadata with the same key. It also
 * allows removing all metadata matching the key, if needed.
 *
 * @since 1.5.0
 *
 * @param int    $post_id    Post ID.
 * @param string $meta_key   Metadata name.
 * @param mixed  $meta_value Optional. Metadata value. Must be serializable if
 *                           non-scalar. Default empty.
 * @return bool True on success, false on failure.
 */
function delete_post_meta( $post_id, $meta_key, $meta_value = '' ) {
	// Make sure meta is added to the post, not a revision.
	$the_post = wp_is_post_revision( $post_id );
	if ( $the_post ) {
		$post_id = $the_post;
	}

	return delete_metadata( 'post', $post_id, $meta_key, $meta_value );
}

/**
 * Retrieves a post meta field for the given post ID.
 *
 * @since 1.5.0
 *
 * @param int    $post_id Post ID.
 * @param string $key     Optional. The meta key to retrieve. By default, returns
 *                        data for all keys. Default empty.
 * @param bool   $single  Optional. If true, returns only the first value for the specified meta key.
 *                        This parameter has no effect if $key is not specified. Default false.
 * @return mixed Will be an array if $single is false. Will be value of the meta
 *               field if $single is true.
 */
function get_post_meta( $post_id, $key = '', $single = false ) {
	return get_metadata( 'post', $post_id, $key, $single );
}

/**
 * Updates a post meta field based on the given post ID.
 *
 * Use the `$prev_value` parameter to differentiate between meta fields with the
 * same key and post ID.
 *
 * If the meta field for the post does not exist, it will be added and its ID returned.
 *
 * Can be used in place of add_post_meta().
 *
 * @since 1.5.0
 *
 * @param int    $post_id    Post ID.
 * @param string $meta_key   Metadata key.
 * @param mixed  $meta_value Metadata value. Must be serializable if non-scalar.
 * @param mixed  $prev_value Optional. Previous value to check before updating.
 * @return int|bool The new meta field ID if a field with the given key didn't exist and was
 *                  therefore added, true on successful update, false on failure.
 */
function update_post_meta( $post_id, $meta_key, $meta_value, $prev_value = '' ) {
	// Make sure meta is added to the post, not a revision.
	$the_post = wp_is_post_revision( $post_id );
	if ( $the_post ) {
		$post_id = $the_post;
	}

	return update_metadata( 'post', $post_id, $meta_key, $meta_value, $prev_value );
}

/**
 * Deletes everything from post meta matching the given meta key.
 *
 * @since 2.3.0
 *
 * @param string $post_meta_key Key to search for when deleting.
 * @return bool Whether the post meta key was deleted from the database.
 */
function delete_post_meta_by_key( $post_meta_key ) {
	return delete_metadata( 'post', null, $post_meta_key, '', true );
}

/**
 * Registers a meta key for posts.
 *
 * @since 4.9.8
 *
 * @param string $post_type Post type to register a meta key for. Pass an empty string
 *                          to register the meta key across all existing post types.
 * @param string $meta_key  The meta key to register.
 * @param array  $args      Data used to describe the meta key when registered. See
 *                          {@see register_meta()} for a list of supported arguments.
 * @return bool True if the meta key was successfully registered, false if not.
 */
function register_post_meta( $post_type, $meta_key, array $args ) {
	$args['object_subtype'] = $post_type;

	return register_meta( 'post', $meta_key, $args );
}

/**
 * Unregisters a meta key for posts.
 *
 * @since 4.9.8
 *
 * @param string $post_type Post type the meta key is currently registered for. Pass
 *                          an empty string if the meta key is registered across all
 *                          existing post types.
 * @param string $meta_key  The meta key to unregister.
 * @return bool True on success, false if the meta key was not previously registered.
 */
function unregister_post_meta( $post_type, $meta_key ) {
	return unregister_meta_key( 'post', $meta_key, $post_type );
}

/**
 * Retrieve post meta fields, based on post ID.
 *
 * The post meta fields are retrieved from the cache where possible,
 * so the function is optimized to be called more than once.
 *
 * @since 1.2.0
 *
 * @param int $post_id Optional. Post ID. Default is ID of the global $post.
 * @return array Post meta for the given post.
 */
function get_post_custom( $post_id = 0 ) {
	$post_id = absint( $post_id );
	if ( ! $post_id ) {
		$post_id = get_the_ID();
	}

	return get_post_meta( $post_id );
}

/**
 * Retrieve meta field names for a post.
 *
 * If there are no meta fields, then nothing (null) will be returned.
 *
 * @since 1.2.0
 *
 * @param int $post_id Optional. Post ID. Default is ID of the global $post.
 * @return array|void Array of the keys, if retrieved.
 */
function get_post_custom_keys( $post_id = 0 ) {
	$custom = get_post_custom( $post_id );

	if ( ! is_array( $custom ) ) {
		return;
	}

	if ( $keys = array_keys( $custom ) ) {
		return $keys;
	}
}

/**
 * Retrieve values for a custom post field.
 *
 * The parameters must not be considered optional. All of the post meta fields
 * will be retrieved and only the meta field key values returned.
 *
 * @since 1.2.0
 *
 * @param string $key     Optional. Meta field key. Default empty.
 * @param int    $post_id Optional. Post ID. Default is ID of the global $post.
 * @return array|null Meta field values.
 */
function get_post_custom_values( $key = '', $post_id = 0 ) {
	if ( ! $key ) {
		return null;
	}

	$custom = get_post_custom( $post_id );

	return isset( $custom[ $key ] ) ? $custom[ $key ] : null;
}

/**
 * Determines whether a post is sticky.
 *
 * Sticky posts should remain at the top of The Loop. If the post ID is not
 * given, then The Loop ID for the current post will be used.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 2.7.0
 *
 * @param int $post_id Optional. Post ID. Default is ID of the global $post.
 * @return bool Whether post is sticky.
 */
function is_sticky( $post_id = 0 ) {
	$post_id = absint( $post_id );

	if ( ! $post_id ) {
		$post_id = get_the_ID();
	}

	$stickies = get_option( 'sticky_posts' );

	if ( ! is_array( $stickies ) ) {
		return false;
	}

	if ( in_array( $post_id, $stickies ) ) {
		return true;
	}

	return false;
}

/**
 * Sanitize every post field.
 *
 * If the context is 'raw', then the post object or array will get minimal
 * sanitization of the integer fields.
 *
 * @since 2.3.0
 *
 * @see sanitize_post_field()
 *
 * @param object|WP_Post|array $post    The Post Object or Array
 * @param string               $context Optional. How to sanitize post fields.
 *                                      Accepts 'raw', 'edit', 'db', or 'display'.
 *                                      Default 'display'.
 * @return object|WP_Post|array The now sanitized Post Object or Array (will be the
 *                              same type as $post).
 */
function sanitize_post( $post, $context = 'display' ) {
	if ( is_object( $post ) ) {
		// Check if post already filtered for this context.
		if ( isset( $post->filter ) && $context == $post->filter ) {
			return $post;
		}
		if ( ! isset( $post->ID ) ) {
			$post->ID = 0;
		}
		foreach ( array_keys( get_object_vars( $post ) ) as $field ) {
			$post->$field = sanitize_post_field( $field, $post->$field, $post->ID, $context );
		}
		$post->filter = $context;
	} elseif ( is_array( $post ) ) {
		// Check if post already filtered for this context.
		if ( isset( $post['filter'] ) && $context == $post['filter'] ) {
			return $post;
		}
		if ( ! isset( $post['ID'] ) ) {
			$post['ID'] = 0;
		}
		foreach ( array_keys( $post ) as $field ) {
			$post[ $field ] = sanitize_post_field( $field, $post[ $field ], $post['ID'], $context );
		}
		$post['filter'] = $context;
	}
	return $post;
}

/**
 * Sanitize post field based on context.
 *
 * Possible context values are:  'raw', 'edit', 'db', 'display', 'attribute' and
 * 'js'. The 'display' context is used by default. 'attribute' and 'js' contexts
 * are treated like 'display' when calling filters.
 *
 * @since 2.3.0
 * @since 4.4.0 Like `sanitize_post()`, `$context` defaults to 'display'.
 *
 * @param string $field   The Post Object field name.
 * @param mixed  $value   The Post Object value.
 * @param int    $post_id Post ID.
 * @param string $context Optional. How to sanitize post fields. Looks for 'raw', 'edit',
 *                        'db', 'display', 'attribute' and 'js'. Default 'display'.
 * @return mixed Sanitized value.
 */
function sanitize_post_field( $field, $value, $post_id, $context = 'display' ) {
	$int_fields = array( 'ID', 'post_parent', 'menu_order' );
	if ( in_array( $field, $int_fields ) ) {
		$value = (int) $value;
	}

	// Fields which contain arrays of integers.
	$array_int_fields = array( 'ancestors' );
	if ( in_array( $field, $array_int_fields ) ) {
		$value = array_map( 'absint', $value );
		return $value;
	}

	if ( 'raw' == $context ) {
		return $value;
	}

	$prefixed = false;
	if ( false !== strpos( $field, 'post_' ) ) {
		$prefixed        = true;
		$field_no_prefix = str_replace( 'post_', '', $field );
	}

	if ( 'edit' == $context ) {
		$format_to_edit = array( 'post_content', 'post_excerpt', 'post_title', 'post_password' );

		if ( $prefixed ) {

			/**
			 * Filters the value of a specific post field to edit.
			 *
			 * The dynamic portion of the hook name, `$field`, refers to the post
			 * field name.
			 *
			 * @since 2.3.0
			 *
			 * @param mixed $value   Value of the post field.
			 * @param int   $post_id Post ID.
			 */
			$value = apply_filters( "edit_{$field}", $value, $post_id );

			/**
			 * Filters the value of a specific post field to edit.
			 *
			 * The dynamic portion of the hook name, `$field_no_prefix`, refers to
			 * the post field name.
			 *
			 * @since 2.3.0
			 *
			 * @param mixed $value   Value of the post field.
			 * @param int   $post_id Post ID.
			 */
			$value = apply_filters( "{$field_no_prefix}_edit_pre", $value, $post_id );
		} else {
			$value = apply_filters( "edit_post_{$field}", $value, $post_id );
		}

		if ( in_array( $field, $format_to_edit ) ) {
			if ( 'post_content' == $field ) {
				$value = format_to_edit( $value, user_can_richedit() );
			} else {
				$value = format_to_edit( $value );
			}
		} else {
			$value = esc_attr( $value );
		}
	} elseif ( 'db' == $context ) {
		if ( $prefixed ) {

			/**
			 * Filters the value of a specific post field before saving.
			 *
			 * The dynamic portion of the hook name, `$field`, refers to the post
			 * field name.
			 *
			 * @since 2.3.0
			 *
			 * @param mixed $value Value of the post field.
			 */
			$value = apply_filters( "pre_{$field}", $value );

			/**
			 * Filters the value of a specific field before saving.
			 *
			 * The dynamic portion of the hook name, `$field_no_prefix`, refers
			 * to the post field name.
			 *
			 * @since 2.3.0
			 *
			 * @param mixed $value Value of the post field.
			 */
			$value = apply_filters( "{$field_no_prefix}_save_pre", $value );
		} else {
			$value = apply_filters( "pre_post_{$field}", $value );

			/**
			 * Filters the value of a specific post field before saving.
			 *
			 * The dynamic portion of the hook name, `$field`, refers to the post
			 * field name.
			 *
			 * @since 2.3.0
			 *
			 * @param mixed $value Value of the post field.
			 */
			$value = apply_filters( "{$field}_pre", $value );
		}
	} else {

		// Use display filters by default.
		if ( $prefixed ) {

			/**
			 * Filters the value of a specific post field for display.
			 *
			 * The dynamic portion of the hook name, `$field`, refers to the post
			 * field name.
			 *
			 * @since 2.3.0
			 *
			 * @param mixed  $value   Value of the prefixed post field.
			 * @param int    $post_id Post ID.
			 * @param string $context Context for how to sanitize the field. Possible
			 *                        values include 'raw', 'edit', 'db', 'display',
			 *                        'attribute' and 'js'.
			 */
			$value = apply_filters( "{$field}", $value, $post_id, $context );
		} else {
			$value = apply_filters( "post_{$field}", $value, $post_id, $context );
		}

		if ( 'attribute' == $context ) {
			$value = esc_attr( $value );
		} elseif ( 'js' == $context ) {
			$value = esc_js( $value );
		}
	}

	return $value;
}

/**
 * Make a post sticky.
 *
 * Sticky posts should be displayed at the top of the front page.
 *
 * @since 2.7.0
 *
 * @param int $post_id Post ID.
 */
function stick_post( $post_id ) {
	$stickies = get_option( 'sticky_posts' );

	if ( ! is_array( $stickies ) ) {
		$stickies = array( $post_id );
	}

	if ( ! in_array( $post_id, $stickies ) ) {
		$stickies[] = $post_id;
	}

	$updated = update_option( 'sticky_posts', $stickies );

	if ( $updated ) {
		/**
		 * Fires once a post has been added to the sticky list.
		 *
		 * @since 4.6.0
		 *
		 * @param int $post_id ID of the post that was stuck.
		 */
		do_action( 'post_stuck', $post_id );
	}
}

/**
 * Un-stick a post.
 *
 * Sticky posts should be displayed at the top of the front page.
 *
 * @since 2.7.0
 *
 * @param int $post_id Post ID.
 */
function unstick_post( $post_id ) {
	$stickies = get_option( 'sticky_posts' );

	if ( ! is_array( $stickies ) ) {
		return;
	}

	if ( ! in_array( $post_id, $stickies ) ) {
		return;
	}

	$offset = array_search( $post_id, $stickies );
	if ( false === $offset ) {
		return;
	}

	array_splice( $stickies, $offset, 1 );

	$updated = update_option( 'sticky_posts', $stickies );

	if ( $updated ) {
		/**
		 * Fires once a post has been removed from the sticky list.
		 *
		 * @since 4.6.0
		 *
		 * @param int $post_id ID of the post that was unstuck.
		 */
		do_action( 'post_unstuck', $post_id );
	}
}

/**
 * Return the cache key for wp_count_posts() based on the passed arguments.
 *
 * @since 3.9.0
 * @access private
 *
 * @param string $type Optional. Post type to retrieve count Default 'post'.
 * @param string $perm Optional. 'readable' or empty. Default empty.
 * @return string The cache key.
 */
function _count_posts_cache_key( $type = 'post', $perm = '' ) {
	$cache_key = 'posts-' . $type;
	if ( 'readable' == $perm && is_user_logged_in() ) {
		$post_type_object = get_post_type_object( $type );
		if ( $post_type_object && ! current_user_can( $post_type_object->cap->read_private_posts ) ) {
			$cache_key .= '_' . $perm . '_' . get_current_user_id();
		}
	}
	return $cache_key;
}

/**
 * Count number of posts of a post type and if user has permissions to view.
 *
 * This function provides an efficient method of finding the amount of post's
 * type a blog has. Another method is to count the amount of items in
 * get_posts(), but that method has a lot of overhead with doing so. Therefore,
 * when developing for 2.5+, use this function instead.
 *
 * The $perm parameter checks for 'readable' value and if the user can read
 * private posts, it will display that for the user that is signed in.
 *
 * @since 2.5.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $type Optional. Post type to retrieve count. Default 'post'.
 * @param string $perm Optional. 'readable' or empty. Default empty.
 * @return object Number of posts for each status.
 */
function wp_count_posts( $type = 'post', $perm = '' ) {
	global $wpdb;

	if ( ! post_type_exists( $type ) ) {
		return new stdClass;
	}

	$cache_key = _count_posts_cache_key( $type, $perm );

	$counts = wp_cache_get( $cache_key, 'counts' );
	if ( false !== $counts ) {
		/** This filter is documented in wp-includes/post.php */
		return apply_filters( 'wp_count_posts', $counts, $type, $perm );
	}

	$query = "SELECT post_status, COUNT( * ) AS num_posts FROM {$wpdb->posts} WHERE post_type = %s";
	if ( 'readable' == $perm && is_user_logged_in() ) {
		$post_type_object = get_post_type_object( $type );
		if ( ! current_user_can( $post_type_object->cap->read_private_posts ) ) {
			$query .= $wpdb->prepare(
				" AND (post_status != 'private' OR ( post_author = %d AND post_status = 'private' ))",
				get_current_user_id()
			);
		}
	}
	$query .= ' GROUP BY post_status';

	$results = (array) $wpdb->get_results( $wpdb->prepare( $query, $type ), ARRAY_A );
	$counts  = array_fill_keys( get_post_stati(), 0 );

	foreach ( $results as $row ) {
		$counts[ $row['post_status'] ] = $row['num_posts'];
	}

	$counts = (object) $counts;
	wp_cache_set( $cache_key, $counts, 'counts' );

	/**
	 * Modify returned post counts by status for the current post type.
	 *
	 * @since 3.7.0
	 *
	 * @param object $counts An object containing the current post_type's post
	 *                       counts by status.
	 * @param string $type   Post type.
	 * @param string $perm   The permission to determine if the posts are 'readable'
	 *                       by the current user.
	 */
	return apply_filters( 'wp_count_posts', $counts, $type, $perm );
}

/**
 * Count number of attachments for the mime type(s).
 *
 * If you set the optional mime_type parameter, then an array will still be
 * returned, but will only have the item you are looking for. It does not give
 * you the number of attachments that are children of a post. You can get that
 * by counting the number of children that post has.
 *
 * @since 2.5.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string|array $mime_type Optional. Array or comma-separated list of
 *                                MIME patterns. Default empty.
 * @return object An object containing the attachment counts by mime type.
 */
function wp_count_attachments( $mime_type = '' ) {
	global $wpdb;

	$and   = wp_post_mime_type_where( $mime_type );
	$count = $wpdb->get_results( "SELECT post_mime_type, COUNT( * ) AS num_posts FROM $wpdb->posts WHERE post_type = 'attachment' AND post_status != 'trash' $and GROUP BY post_mime_type", ARRAY_A );

	$counts = array();
	foreach ( (array) $count as $row ) {
		$counts[ $row['post_mime_type'] ] = $row['num_posts'];
	}
	$counts['trash'] = $wpdb->get_var( "SELECT COUNT( * ) FROM $wpdb->posts WHERE post_type = 'attachment' AND post_status = 'trash' $and" );

	/**
	 * Modify returned attachment counts by mime type.
	 *
	 * @since 3.7.0
	 *
	 * @param object $counts    An object containing the attachment counts by
	 *                          mime type.
	 * @param string $mime_type The mime type pattern used to filter the attachments
	 *                          counted.
	 */
	return apply_filters( 'wp_count_attachments', (object) $counts, $mime_type );
}

/**
 * Get default post mime types.
 *
 * @since 2.9.0
 *
 * @return array List of post mime types.
 */
function get_post_mime_types() {
	$post_mime_types = array(   //	array( adj, noun )
		'image' => array( __( 'Images' ), __( 'Manage Images' ), _n_noop( 'Image <span class="count">(%s)</span>', 'Images <span class="count">(%s)</span>' ) ),
		'audio' => array( __( 'Audio' ), __( 'Manage Audio' ), _n_noop( 'Audio <span class="count">(%s)</span>', 'Audio <span class="count">(%s)</span>' ) ),
		'video' => array( __( 'Video' ), __( 'Manage Video' ), _n_noop( 'Video <span class="count">(%s)</span>', 'Video <span class="count">(%s)</span>' ) ),
	);

	/**
	 * Filters the default list of post mime types.
	 *
	 * @since 2.5.0
	 *
	 * @param array $post_mime_types Default list of post mime types.
	 */
	return apply_filters( 'post_mime_types', $post_mime_types );
}

/**
 * Check a MIME-Type against a list.
 *
 * If the wildcard_mime_types parameter is a string, it must be comma separated
 * list. If the real_mime_types is a string, it is also comma separated to
 * create the list.
 *
 * @since 2.5.0
 *
 * @param string|array $wildcard_mime_types Mime types, e.g. audio/mpeg or image (same as image/*)
 *                                          or flash (same as *flash*).
 * @param string|array $real_mime_types     Real post mime type values.
 * @return array array(wildcard=>array(real types)).
 */
function wp_match_mime_types( $wildcard_mime_types, $real_mime_types ) {
	$matches = array();
	if ( is_string( $wildcard_mime_types ) ) {
		$wildcard_mime_types = array_map( 'trim', explode( ',', $wildcard_mime_types ) );
	}
	if ( is_string( $real_mime_types ) ) {
		$real_mime_types = array_map( 'trim', explode( ',', $real_mime_types ) );
	}

	$patternses = array();
	$wild       = '[-._a-z0-9]*';

	foreach ( (array) $wildcard_mime_types as $type ) {
		$mimes = array_map( 'trim', explode( ',', $type ) );
		foreach ( $mimes as $mime ) {
			$regex                 = str_replace( '__wildcard__', $wild, preg_quote( str_replace( '*', '__wildcard__', $mime ) ) );
			$patternses[][ $type ] = "^$regex$";
			if ( false === strpos( $mime, '/' ) ) {
				$patternses[][ $type ] = "^$regex/";
				$patternses[][ $type ] = $regex;
			}
		}
	}
	asort( $patternses );

	foreach ( $patternses as $patterns ) {
		foreach ( $patterns as $type => $pattern ) {
			foreach ( (array) $real_mime_types as $real ) {
				if ( preg_match( "#$pattern#", $real ) && ( empty( $matches[ $type ] ) || false === array_search( $real, $matches[ $type ] ) ) ) {
					$matches[ $type ][] = $real;
				}
			}
		}
	}
	return $matches;
}

/**
 * Convert MIME types into SQL.
 *
 * @since 2.5.0
 *
 * @param string|array $post_mime_types List of mime types or comma separated string
 *                                      of mime types.
 * @param string       $table_alias     Optional. Specify a table alias, if needed.
 *                                      Default empty.
 * @return string The SQL AND clause for mime searching.
 */
function wp_post_mime_type_where( $post_mime_types, $table_alias = '' ) {
	$where     = '';
	$wildcards = array( '', '%', '%/%' );
	if ( is_string( $post_mime_types ) ) {
		$post_mime_types = array_map( 'trim', explode( ',', $post_mime_types ) );
	}

	$wheres = array();

	foreach ( (array) $post_mime_types as $mime_type ) {
		$mime_type = preg_replace( '/\s/', '', $mime_type );
		$slashpos  = strpos( $mime_type, '/' );
		if ( false !== $slashpos ) {
			$mime_group    = preg_replace( '/[^-*.a-zA-Z0-9]/', '', substr( $mime_type, 0, $slashpos ) );
			$mime_subgroup = preg_replace( '/[^-*.+a-zA-Z0-9]/', '', substr( $mime_type, $slashpos + 1 ) );
			if ( empty( $mime_subgroup ) ) {
				$mime_subgroup = '*';
			} else {
				$mime_subgroup = str_replace( '/', '', $mime_subgroup );
			}
			$mime_pattern = "$mime_group/$mime_subgroup";
		} else {
			$mime_pattern = preg_replace( '/[^-*.a-zA-Z0-9]/', '', $mime_type );
			if ( false === strpos( $mime_pattern, '*' ) ) {
				$mime_pattern .= '/*';
			}
		}

		$mime_pattern = preg_replace( '/\*+/', '%', $mime_pattern );

		if ( in_array( $mime_type, $wildcards ) ) {
			return '';
		}

		if ( false !== strpos( $mime_pattern, '%' ) ) {
			$wheres[] = empty( $table_alias ) ? "post_mime_type LIKE '$mime_pattern'" : "$table_alias.post_mime_type LIKE '$mime_pattern'";
		} else {
			$wheres[] = empty( $table_alias ) ? "post_mime_type = '$mime_pattern'" : "$table_alias.post_mime_type = '$mime_pattern'";
		}
	}
	if ( ! empty( $wheres ) ) {
		$where = ' AND (' . join( ' OR ', $wheres ) . ') ';
	}
	return $where;
}

/**
 * Trash or delete a post or page.
 *
 * When the post and page is permanently deleted, everything that is tied to
 * it is deleted also. This includes comments, post meta fields, and terms
 * associated with the post.
 *
 * The post or page is moved to trash instead of permanently deleted unless
 * trash is disabled, item is already in the trash, or $force_delete is true.
 *
 * @since 1.0.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 * @see wp_delete_attachment()
 * @see wp_trash_post()
 *
 * @param int  $postid       Optional. Post ID. Default 0.
 * @param bool $force_delete Optional. Whether to bypass trash and force deletion.
 *                           Default false.
 * @return WP_Post|false|null Post data on success, false or null on failure.
 */
function wp_delete_post( $postid = 0, $force_delete = false ) {
	global $wpdb;

	$post = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->posts WHERE ID = %d", $postid ) );

	if ( ! $post ) {
		return $post;
	}

	$post = get_post( $post );

	if ( ! $force_delete && ( 'post' === $post->post_type || 'page' === $post->post_type ) && 'trash' !== get_post_status( $postid ) && EMPTY_TRASH_DAYS ) {
		return wp_trash_post( $postid );
	}

	if ( 'attachment' === $post->post_type ) {
		return wp_delete_attachment( $postid, $force_delete );
	}

	/**
	 * Filters whether a post deletion should take place.
	 *
	 * @since 4.4.0
	 *
	 * @param bool    $delete       Whether to go forward with deletion.
	 * @param WP_Post $post         Post object.
	 * @param bool    $force_delete Whether to bypass the trash.
	 */
	$check = apply_filters( 'pre_delete_post', null, $post, $force_delete );
	if ( null !== $check ) {
		return $check;
	}

	/**
	 * Fires before a post is deleted, at the start of wp_delete_post().
	 *
	 * @since 3.2.0
	 *
	 * @see wp_delete_post()
	 *
	 * @param int $postid Post ID.
	 */
	do_action( 'before_delete_post', $postid );

	delete_post_meta( $postid, '_wp_trash_meta_status' );
	delete_post_meta( $postid, '_wp_trash_meta_time' );

	wp_delete_object_term_relationships( $postid, get_object_taxonomies( $post->post_type ) );

	$parent_data  = array( 'post_parent' => $post->post_parent );
	$parent_where = array( 'post_parent' => $postid );

	if ( is_post_type_hierarchical( $post->post_type ) ) {
		// Point children of this page to its parent, also clean the cache of affected children.
		$children_query = $wpdb->prepare( "SELECT * FROM $wpdb->posts WHERE post_parent = %d AND post_type = %s", $postid, $post->post_type );
		$children       = $wpdb->get_results( $children_query );
		if ( $children ) {
			$wpdb->update( $wpdb->posts, $parent_data, $parent_where + array( 'post_type' => $post->post_type ) );
		}
	}

	// Do raw query. wp_get_post_revisions() is filtered.
	$revision_ids = $wpdb->get_col( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE post_parent = %d AND post_type = 'revision'", $postid ) );
	// Use wp_delete_post (via wp_delete_post_revision) again. Ensures any meta/misplaced data gets cleaned up.
	foreach ( $revision_ids as $revision_id ) {
		wp_delete_post_revision( $revision_id );
	}

	// Point all attachments to this post up one level.
	$wpdb->update( $wpdb->posts, $parent_data, $parent_where + array( 'post_type' => 'attachment' ) );

	wp_defer_comment_counting( true );

	$comment_ids = $wpdb->get_col( $wpdb->prepare( "SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = %d", $postid ) );
	foreach ( $comment_ids as $comment_id ) {
		wp_delete_comment( $comment_id, true );
	}

	wp_defer_comment_counting( false );

	$post_meta_ids = $wpdb->get_col( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE post_id = %d ", $postid ) );
	foreach ( $post_meta_ids as $mid ) {
		delete_metadata_by_mid( 'post', $mid );
	}

	/**
	 * Fires immediately before a post is deleted from the database.
	 *
	 * @since 1.2.0
	 *
	 * @param int $postid Post ID.
	 */
	do_action( 'delete_post', $postid );
	$result = $wpdb->delete( $wpdb->posts, array( 'ID' => $postid ) );
	if ( ! $result ) {
		return false;
	}

	/**
	 * Fires immediately after a post is deleted from the database.
	 *
	 * @since 2.2.0
	 *
	 * @param int $postid Post ID.
	 */
	do_action( 'deleted_post', $postid );

	clean_post_cache( $post );

	if ( is_post_type_hierarchical( $post->post_type ) && $children ) {
		foreach ( $children as $child ) {
			clean_post_cache( $child );
		}
	}

	wp_clear_scheduled_hook( 'publish_future_post', array( $postid ) );

	/**
	 * Fires after a post is deleted, at the conclusion of wp_delete_post().
	 *
	 * @since 3.2.0
	 *
	 * @see wp_delete_post()
	 *
	 * @param int $postid Post ID.
	 */
	do_action( 'after_delete_post', $postid );

	return $post;
}

/**
 * Reset the page_on_front, show_on_front, and page_for_post settings when
 * a linked page is deleted or trashed.
 *
 * Also ensures the post is no longer sticky.
 *
 * @since 3.7.0
 * @access private
 *
 * @param int $post_id Post ID.
 */
function _reset_front_page_settings_for_post( $post_id ) {
	$post = get_post( $post_id );
	if ( 'page' == $post->post_type ) {
		/*
		  * If the page is defined in option page_on_front or post_for_posts,
		  * adjust the corresponding options.
		  */
		if ( get_option( 'page_on_front' ) == $post->ID ) {
			update_option( 'show_on_front', 'posts' );
			update_option( 'page_on_front', 0 );
		}
		if ( get_option( 'page_for_posts' ) == $post->ID ) {
			delete_option( 'page_for_posts', 0 );
		}
	}
	unstick_post( $post->ID );
}

/**
 * Move a post or page to the Trash
 *
 * If trash is disabled, the post or page is permanently deleted.
 *
 * @since 2.9.0
 *
 * @see wp_delete_post()
 *
 * @param int $post_id Optional. Post ID. Default is ID of the global $post
 *                     if EMPTY_TRASH_DAYS equals true.
 * @return WP_Post|false|null Post data on success, false or null on failure.
 */
function wp_trash_post( $post_id = 0 ) {
	if ( ! EMPTY_TRASH_DAYS ) {
		return wp_delete_post( $post_id, true );
	}

	$post = get_post( $post_id );

	if ( ! $post ) {
		return $post;
	}

	if ( 'trash' === $post->post_status ) {
		return false;
	}

	/**
	 * Filters whether a post trashing should take place.
	 *
	 * @since 4.9.0
	 *
	 * @param bool    $trash Whether to go forward with trashing.
	 * @param WP_Post $post  Post object.
	 */
	$check = apply_filters( 'pre_trash_post', null, $post );
	if ( null !== $check ) {
		return $check;
	}

	/**
	 * Fires before a post is sent to the trash.
	 *
	 * @since 3.3.0
	 *
	 * @param int $post_id Post ID.
	 */
	do_action( 'wp_trash_post', $post_id );

	add_post_meta( $post_id, '_wp_trash_meta_status', $post->post_status );
	add_post_meta( $post_id, '_wp_trash_meta_time', time() );

	wp_update_post(
		array(
			'ID'          => $post_id,
			'post_status' => 'trash',
		)
	);

	wp_trash_post_comments( $post_id );

	/**
	 * Fires after a post is sent to the trash.
	 *
	 * @since 2.9.0
	 *
	 * @param int $post_id Post ID.
	 */
	do_action( 'trashed_post', $post_id );

	return $post;
}

/**
 * Restore a post or page from the Trash.
 *
 * @since 2.9.0
 *
 * @param int $post_id Optional. Post ID. Default is ID of the global $post.
 * @return WP_Post|false|null Post data on success, false or null on failure.
 */
function wp_untrash_post( $post_id = 0 ) {
	$post = get_post( $post_id );

	if ( ! $post ) {
		return $post;
	}

	if ( 'trash' !== $post->post_status ) {
		return false;
	}

	/**
	 * Filters whether a post untrashing should take place.
	 *
	 * @since 4.9.0
	 *
	 * @param bool    $untrash Whether to go forward with untrashing.
	 * @param WP_Post $post    Post object.
	 */
	$check = apply_filters( 'pre_untrash_post', null, $post );
	if ( null !== $check ) {
		return $check;
	}

	/**
	 * Fires before a post is restored from the trash.
	 *
	 * @since 2.9.0
	 *
	 * @param int $post_id Post ID.
	 */
	do_action( 'untrash_post', $post_id );

	$post_status = get_post_meta( $post_id, '_wp_trash_meta_status', true );

	delete_post_meta( $post_id, '_wp_trash_meta_status' );
	delete_post_meta( $post_id, '_wp_trash_meta_time' );

	wp_update_post(
		array(
			'ID'          => $post_id,
			'post_status' => $post_status,
		)
	);

	wp_untrash_post_comments( $post_id );

	/**
	 * Fires after a post is restored from the trash.
	 *
	 * @since 2.9.0
	 *
	 * @param int $post_id Post ID.
	 */
	do_action( 'untrashed_post', $post_id );

	return $post;
}

/**
 * Moves comments for a post to the trash.
 *
 * @since 2.9.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int|WP_Post|null $post Optional. Post ID or post object. Defaults to global $post.
 * @return mixed|void False on failure.
 */
function wp_trash_post_comments( $post = null ) {
	global $wpdb;

	$post = get_post( $post );
	if ( empty( $post ) ) {
		return;
	}

	$post_id = $post->ID;

	/**
	 * Fires before comments are sent to the trash.
	 *
	 * @since 2.9.0
	 *
	 * @param int $post_id Post ID.
	 */
	do_action( 'trash_post_comments', $post_id );

	$comments = $wpdb->get_results( $wpdb->prepare( "SELECT comment_ID, comment_approved FROM $wpdb->comments WHERE comment_post_ID = %d", $post_id ) );
	if ( empty( $comments ) ) {
		return;
	}

	// Cache current status for each comment.
	$statuses = array();
	foreach ( $comments as $comment ) {
		$statuses[ $comment->comment_ID ] = $comment->comment_approved;
	}
	add_post_meta( $post_id, '_wp_trash_meta_comments_status', $statuses );

	// Set status for all comments to post-trashed.
	$result = $wpdb->update( $wpdb->comments, array( 'comment_approved' => 'post-trashed' ), array( 'comment_post_ID' => $post_id ) );

	clean_comment_cache( array_keys( $statuses ) );

	/**
	 * Fires after comments are sent to the trash.
	 *
	 * @since 2.9.0
	 *
	 * @param int   $post_id  Post ID.
	 * @param array $statuses Array of comment statuses.
	 */
	do_action( 'trashed_post_comments', $post_id, $statuses );

	return $result;
}

/**
 * Restore comments for a post from the trash.
 *
 * @since 2.9.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int|WP_Post|null $post Optional. Post ID or post object. Defaults to global $post.
 * @return true|void
 */
function wp_untrash_post_comments( $post = null ) {
	global $wpdb;

	$post = get_post( $post );
	if ( empty( $post ) ) {
		return;
	}

	$post_id = $post->ID;

	$statuses = get_post_meta( $post_id, '_wp_trash_meta_comments_status', true );

	if ( empty( $statuses ) ) {
		return true;
	}

	/**
	 * Fires before comments are restored for a post from the trash.
	 *
	 * @since 2.9.0
	 *
	 * @param int $post_id Post ID.
	 */
	do_action( 'untrash_post_comments', $post_id );

	// Restore each comment to its original status.
	$group_by_status = array();
	foreach ( $statuses as $comment_id => $comment_status ) {
		$group_by_status[ $comment_status ][] = $comment_id;
	}

	foreach ( $group_by_status as $status => $comments ) {
		// Sanity check. This shouldn't happen.
		if ( 'post-trashed' == $status ) {
			$status = '0';
		}
		$comments_in = implode( ', ', array_map( 'intval', $comments ) );
		$wpdb->query( $wpdb->prepare( "UPDATE $wpdb->comments SET comment_approved = %s WHERE comment_ID IN ($comments_in)", $status ) );
	}

	clean_comment_cache( array_keys( $statuses ) );

	delete_post_meta( $post_id, '_wp_trash_meta_comments_status' );

	/**
	 * Fires after comments are restored for a post from the trash.
	 *
	 * @since 2.9.0
	 *
	 * @param int $post_id Post ID.
	 */
	do_action( 'untrashed_post_comments', $post_id );
}

/**
 * Retrieve the list of categories for a post.
 *
 * Compatibility layer for themes and plugins. Also an easy layer of abstraction
 * away from the complexity of the taxonomy layer.
 *
 * @since 2.1.0
 *
 * @see wp_get_object_terms()
 *
 * @param int   $post_id Optional. The Post ID. Does not default to the ID of the
 *                       global $post. Default 0.
 * @param array $args    Optional. Category query parameters. Default empty array.
 *                       See WP_Term_Query::__construct() for supported arguments.
 * @return array|WP_Error List of categories. If the `$fields` argument passed via `$args` is 'all' or
 *                        'all_with_object_id', an array of WP_Term objects will be returned. If `$fields`
 *                        is 'ids', an array of category ids. If `$fields` is 'names', an array of category names.
 *                        WP_Error object if 'category' taxonomy doesn't exist.
 */
function wp_get_post_categories( $post_id = 0, $args = array() ) {
	$post_id = (int) $post_id;

	$defaults = array( 'fields' => 'ids' );
	$args     = wp_parse_args( $args, $defaults );

	$cats = wp_get_object_terms( $post_id, 'category', $args );
	return $cats;
}

/**
 * Retrieve the tags for a post.
 *
 * There is only one default for this function, called 'fields' and by default
 * is set to 'all'. There are other defaults that can be overridden in
 * wp_get_object_terms().
 *
 * @since 2.3.0
 *
 * @param int   $post_id Optional. The Post ID. Does not default to the ID of the
 *                       global $post. Default 0.
 * @param array $args    Optional. Tag query parameters. Default empty array.
 *                       See WP_Term_Query::__construct() for supported arguments.
 * @return array|WP_Error Array of WP_Term objects on success or empty array if no tags were found.
 *                        WP_Error object if 'post_tag' taxonomy doesn't exist.
 */
function wp_get_post_tags( $post_id = 0, $args = array() ) {
	return wp_get_post_terms( $post_id, 'post_tag', $args );
}

/**
 * Retrieves the terms for a post.
 *
 * @since 2.8.0
 *
 * @param int          $post_id  Optional. The Post ID. Does not default to the ID of the
 *                               global $post. Default 0.
 * @param string|array $taxonomy Optional. The taxonomy slug or array of slugs for which
 *                               to retrieve terms. Default 'post_tag'.
 * @param array        $args     {
 *     Optional. Term query parameters. See WP_Term_Query::__construct() for supported arguments.
 *
 *     @type string $fields Term fields to retrieve. Default 'all'.
 * }
 * @return array|WP_Error Array of WP_Term objects on success or empty array if no terms were found.
 *                        WP_Error object if `$taxonomy` doesn't exist.
 */
function wp_get_post_terms( $post_id = 0, $taxonomy = 'post_tag', $args = array() ) {
	$post_id = (int) $post_id;

	$defaults = array( 'fields' => 'all' );
	$args     = wp_parse_args( $args, $defaults );

	$tags = wp_get_object_terms( $post_id, $taxonomy, $args );

	return $tags;
}

/**
 * Retrieve a number of recent posts.
 *
 * @since 1.0.0
 *
 * @see get_posts()
 *
 * @param array  $args   Optional. Arguments to retrieve posts. Default empty array.
 * @param string $output Optional. The required return type. One of OBJECT or ARRAY_A, which correspond to
 *                       a WP_Post object or an associative array, respectively. Default ARRAY_A.
 * @return array|false Array of recent posts, where the type of each element is determined by $output parameter.
 *                     Empty array on failure.
 */
function wp_get_recent_posts( $args = array(), $output = ARRAY_A ) {

	if ( is_numeric( $args ) ) {
		_deprecated_argument( __FUNCTION__, '3.1.0', __( 'Passing an integer number of posts is deprecated. Pass an array of arguments instead.' ) );
		$args = array( 'numberposts' => absint( $args ) );
	}

	// Set default arguments.
	$defaults = array(
		'numberposts'      => 10,
		'offset'           => 0,
		'category'         => 0,
		'orderby'          => 'post_date',
		'order'            => 'DESC',
		'include'          => '',
		'exclude'          => '',
		'meta_key'         => '',
		'meta_value'       => '',
		'post_type'        => 'post',
		'post_status'      => 'draft, publish, future, pending, private',
		'suppress_filters' => true,
	);

	$r = wp_parse_args( $args, $defaults );

	$results = get_posts( $r );

	// Backward compatibility. Prior to 3.1 expected posts to be returned in array.
	if ( ARRAY_A == $output ) {
		foreach ( $results as $key => $result ) {
			$results[ $key ] = get_object_vars( $result );
		}
		return $results ? $results : array();
	}

	return $results ? $results : false;

}

/**
 * Insert or update a post.
 *
 * If the $postarr parameter has 'ID' set to a value, then post will be updated.
 *
 * You can set the post date manually, by setting the values for 'post_date'
 * and 'post_date_gmt' keys. You can close the comments or open the comments by
 * setting the value for 'comment_status' key.
 *
 * @since 1.0.0
 * @since 4.2.0 Support was added for encoding emoji in the post title, content, and excerpt.
 * @since 4.4.0 A 'meta_input' array can now be passed to `$postarr` to add post meta data.
 *
 * @see sanitize_post()
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param array $postarr {
 *     An array of elements that make up a post to update or insert.
 *
 *     @type int    $ID                    The post ID. If equal to something other than 0,
 *                                         the post with that ID will be updated. Default 0.
 *     @type int    $post_author           The ID of the user who added the post. Default is
 *                                         the current user ID.
 *     @type string $post_date             The date of the post. Default is the current time.
 *     @type string $post_date_gmt         The date of the post in the GMT timezone. Default is
 *                                         the value of `$post_date`.
 *     @type mixed  $post_content          The post content. Default empty.
 *     @type string $post_content_filtered The filtered post content. Default empty.
 *     @type string $post_title            The post title. Default empty.
 *     @type string $post_excerpt          The post excerpt. Default empty.
 *     @type string $post_status           The post status. Default 'draft'.
 *     @type string $post_type             The post type. Default 'post'.
 *     @type string $comment_status        Whether the post can accept comments. Accepts 'open' or 'closed'.
 *                                         Default is the value of 'default_comment_status' option.
 *     @type string $ping_status           Whether the post can accept pings. Accepts 'open' or 'closed'.
 *                                         Default is the value of 'default_ping_status' option.
 *     @type string $post_password         The password to access the post. Default empty.
 *     @type string $post_name             The post name. Default is the sanitized post title
 *                                         when creating a new post.
 *     @type string $to_ping               Space or carriage return-separated list of URLs to ping.
 *                                         Default empty.
 *     @type string $pinged                Space or carriage return-separated list of URLs that have
 *                                         been pinged. Default empty.
 *     @type string $post_modified         The date when the post was last modified. Default is
 *                                         the current time.
 *     @type string $post_modified_gmt     The date when the post was last modified in the GMT
 *                                         timezone. Default is the current time.
 *     @type int    $post_parent           Set this for the post it belongs to, if any. Default 0.
 *     @type int    $menu_order            The order the post should be displayed in. Default 0.
 *     @type string $post_mime_type        The mime type of the post. Default empty.
 *     @type string $guid                  Global Unique ID for referencing the post. Default empty.
 *     @type array  $post_category         Array of category IDs.
 *                                         Defaults to value of the 'default_category' option.
 *     @type array  $tags_input            Array of tag names, slugs, or IDs. Default empty.
 *     @type array  $tax_input             Array of taxonomy terms keyed by their taxonomy name. Default empty.
 *     @type array  $meta_input            Array of post meta values keyed by their post meta key. Default empty.
 * }
 * @param bool  $wp_error Optional. Whether to return a WP_Error on failure. Default false.
 * @return int|WP_Error The post ID on success. The value 0 or WP_Error on failure.
 */
function wp_insert_post( $postarr, $wp_error = false ) {
	global $wpdb;

	// Capture original pre-sanitized array for passing into filters.
	$unsanitized_postarr = $postarr;

	$user_id = get_current_user_id();

	$defaults = array(
		'post_author'           => $user_id,
		'post_content'          => '',
		'post_content_filtered' => '',
		'post_title'            => '',
		'post_excerpt'          => '',
		'post_status'           => 'draft',
		'post_type'             => 'post',
		'comment_status'        => '',
		'ping_status'           => '',
		'post_password'         => '',
		'to_ping'               => '',
		'pinged'                => '',
		'post_parent'           => 0,
		'menu_order'            => 0,
		'guid'                  => '',
		'import_id'             => 0,
		'context'               => '',
	);

	$postarr = wp_parse_args( $postarr, $defaults );

	unset( $postarr['filter'] );

	$postarr = sanitize_post( $postarr, 'db' );

	// Are we updating or creating?
	$post_ID = 0;
	$update  = false;
	$guid    = $postarr['guid'];

	if ( ! empty( $postarr['ID'] ) ) {
		$update = true;

		// Get the post ID and GUID.
		$post_ID     = $postarr['ID'];
		$post_before = get_post( $post_ID );
		if ( is_null( $post_before ) ) {
			if ( $wp_error ) {
				return new WP_Error( 'invalid_post', __( 'Invalid post ID.' ) );
			}
			return 0;
		}

		$guid            = get_post_field( 'guid', $post_ID );
		$previous_status = get_post_field( 'post_status', $post_ID );
	} else {
		$previous_status = 'new';
	}

	$post_type = empty( $postarr['post_type'] ) ? 'post' : $postarr['post_type'];

	$post_title   = $postarr['post_title'];
	$post_content = $postarr['post_content'];
	$post_excerpt = $postarr['post_excerpt'];
	if ( isset( $postarr['post_name'] ) ) {
		$post_name = $postarr['post_name'];
	} elseif ( $update ) {
		// For an update, don't modify the post_name if it wasn't supplied as an argument.
		$post_name = $post_before->post_name;
	}

	$maybe_empty = 'attachment' !== $post_type
		&& ! $post_content && ! $post_title && ! $post_excerpt
		&& post_type_supports( $post_type, 'editor' )
		&& post_type_supports( $post_type, 'title' )
		&& post_type_supports( $post_type, 'excerpt' );

	/**
	 * Filters whether the post should be considered "empty".
	 *
	 * The post is considered "empty" if both:
	 * 1. The post type supports the title, editor, and excerpt fields
	 * 2. The title, editor, and excerpt fields are all empty
	 *
	 * Returning a truthy value to the filter will effectively short-circuit
	 * the new post being inserted, returning 0. If $wp_error is true, a WP_Error
	 * will be returned instead.
	 *
	 * @since 3.3.0
	 *
	 * @param bool  $maybe_empty Whether the post should be considered "empty".
	 * @param array $postarr     Array of post data.
	 */
	if ( apply_filters( 'wp_insert_post_empty_content', $maybe_empty, $postarr ) ) {
		if ( $wp_error ) {
			return new WP_Error( 'empty_content', __( 'Content, title, and excerpt are empty.' ) );
		} else {
			return 0;
		}
	}

	$post_status = empty( $postarr['post_status'] ) ? 'draft' : $postarr['post_status'];
	if ( 'attachment' === $post_type && ! in_array( $post_status, array( 'inherit', 'private', 'trash', 'auto-draft' ), true ) ) {
		$post_status = 'inherit';
	}

	if ( ! empty( $postarr['post_category'] ) ) {
		// Filter out empty terms.
		$post_category = array_filter( $postarr['post_category'] );
	}

	// Make sure we set a valid category.
	if ( empty( $post_category ) || 0 == count( $post_category ) || ! is_array( $post_category ) ) {
		// 'post' requires at least one category.
		if ( 'post' == $post_type && 'auto-draft' != $post_status ) {
			$post_category = array( get_option( 'default_category' ) );
		} else {
			$post_category = array();
		}
	}

	/*
	 * Don't allow contributors to set the post slug for pending review posts.
	 *
	 * For new posts check the primitive capability, for updates check the meta capability.
	 */
	$post_type_object = get_post_type_object( $post_type );

	if ( ! $update && 'pending' === $post_status && ! current_user_can( $post_type_object->cap->publish_posts ) ) {
		$post_name = '';
	} elseif ( $update && 'pending' === $post_status && ! current_user_can( 'publish_post', $post_ID ) ) {
		$post_name = '';
	}

	/*
	 * Create a valid post name. Drafts and pending posts are allowed to have
	 * an empty post name.
	 */
	if ( empty( $post_name ) ) {
		if ( ! in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ) ) ) {
			$post_name = sanitize_title( $post_title );
		} else {
			$post_name = '';
		}
	} else {
		// On updates, we need to check to see if it's using the old, fixed sanitization context.
		$check_name = sanitize_title( $post_name, '', 'old-save' );
		if ( $update && strtolower( urlencode( $post_name ) ) == $check_name && get_post_field( 'post_name', $post_ID ) == $check_name ) {
			$post_name = $check_name;
		} else { // new post, or slug has changed.
			$post_name = sanitize_title( $post_name );
		}
	}

	/*
	 * If the post date is empty (due to having been new or a draft) and status
	 * is not 'draft' or 'pending', set date to now.
	 */
	if ( empty( $postarr['post_date'] ) || '0000-00-00 00:00:00' == $postarr['post_date'] ) {
		if ( empty( $postarr['post_date_gmt'] ) || '0000-00-00 00:00:00' == $postarr['post_date_gmt'] ) {
			$post_date = current_time( 'mysql' );
		} else {
			$post_date = get_date_from_gmt( $postarr['post_date_gmt'] );
		}
	} else {
		$post_date = $postarr['post_date'];
	}

	// Validate the date.
	$mm         = substr( $post_date, 5, 2 );
	$jj         = substr( $post_date, 8, 2 );
	$aa         = substr( $post_date, 0, 4 );
	$valid_date = wp_checkdate( $mm, $jj, $aa, $post_date );
	if ( ! $valid_date ) {
		if ( $wp_error ) {
			return new WP_Error( 'invalid_date', __( 'Invalid date.' ) );
		} else {
			return 0;
		}
	}

	if ( empty( $postarr['post_date_gmt'] ) || '0000-00-00 00:00:00' == $postarr['post_date_gmt'] ) {
		if ( ! in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ) ) ) {
			$post_date_gmt = get_gmt_from_date( $post_date );
		} else {
			$post_date_gmt = '0000-00-00 00:00:00';
		}
	} else {
		$post_date_gmt = $postarr['post_date_gmt'];
	}

	if ( $update || '0000-00-00 00:00:00' == $post_date ) {
		$post_modified     = current_time( 'mysql' );
		$post_modified_gmt = current_time( 'mysql', 1 );
	} else {
		$post_modified     = $post_date;
		$post_modified_gmt = $post_date_gmt;
	}

	if ( 'attachment' !== $post_type ) {
		if ( 'publish' == $post_status ) {
			$now = gmdate( 'Y-m-d H:i:59' );
			if ( mysql2date( 'U', $post_date_gmt, false ) > mysql2date( 'U', $now, false ) ) {
				$post_status = 'future';
			}
		} elseif ( 'future' == $post_status ) {
			$now = gmdate( 'Y-m-d H:i:59' );
			if ( mysql2date( 'U', $post_date_gmt, false ) <= mysql2date( 'U', $now, false ) ) {
				$post_status = 'publish';
			}
		}
	}

	// Comment status.
	if ( empty( $postarr['comment_status'] ) ) {
		if ( $update ) {
			$comment_status = 'closed';
		} else {
			$comment_status = get_default_comment_status( $post_type );
		}
	} else {
		$comment_status = $postarr['comment_status'];
	}

	// These variables are needed by compact() later.
	$post_content_filtered = $postarr['post_content_filtered'];
	$post_author           = isset( $postarr['post_author'] ) ? $postarr['post_author'] : $user_id;
	$ping_status           = empty( $postarr['ping_status'] ) ? get_default_comment_status( $post_type, 'pingback' ) : $postarr['ping_status'];
	$to_ping               = isset( $postarr['to_ping'] ) ? sanitize_trackback_urls( $postarr['to_ping'] ) : '';
	$pinged                = isset( $postarr['pinged'] ) ? $postarr['pinged'] : '';
	$import_id             = isset( $postarr['import_id'] ) ? $postarr['import_id'] : 0;

	/*
	 * The 'wp_insert_post_parent' filter expects all variables to be present.
	 * Previously, these variables would have already been extracted
	 */
	if ( isset( $postarr['menu_order'] ) ) {
		$menu_order = (int) $postarr['menu_order'];
	} else {
		$menu_order = 0;
	}

	$post_password = isset( $postarr['post_password'] ) ? $postarr['post_password'] : '';
	if ( 'private' == $post_status ) {
		$post_password = '';
	}

	if ( isset( $postarr['post_parent'] ) ) {
		$post_parent = (int) $postarr['post_parent'];
	} else {
		$post_parent = 0;
	}

	$new_postarr = array_merge(
		array(
			'ID' => $post_ID,
		),
		compact( array_diff( array_keys( $defaults ), array( 'context', 'filter' ) ) )
	);

	/**
	 * Filters the post parent -- used to check for and prevent hierarchy loops.
	 *
	 * @since 3.1.0
	 *
	 * @param int   $post_parent Post parent ID.
	 * @param int   $post_ID     Post ID.
	 * @param array $new_postarr Array of parsed post data.
	 * @param array $postarr     Array of sanitized, but otherwise unmodified post data.
	 */
	$post_parent = apply_filters( 'wp_insert_post_parent', $post_parent, $post_ID, $new_postarr, $postarr );

	/*
	 * If the post is being untrashed and it has a desired slug stored in post meta,
	 * reassign it.
	 */
	if ( 'trash' === $previous_status && 'trash' !== $post_status ) {
		$desired_post_slug = get_post_meta( $post_ID, '_wp_desired_post_slug', true );
		if ( $desired_post_slug ) {
			delete_post_meta( $post_ID, '_wp_desired_post_slug' );
			$post_name = $desired_post_slug;
		}
	}

	// If a trashed post has the desired slug, change it and let this post have it.
	if ( 'trash' !== $post_status && $post_name ) {
		wp_add_trashed_suffix_to_post_name_for_trashed_posts( $post_name, $post_ID );
	}

	// When trashing an existing post, change its slug to allow non-trashed posts to use it.
	if ( 'trash' === $post_status && 'trash' !== $previous_status && 'new' !== $previous_status ) {
		$post_name = wp_add_trashed_suffix_to_post_name_for_post( $post_ID );
	}

	$post_name = wp_unique_post_slug( $post_name, $post_ID, $post_status, $post_type, $post_parent );

	// Don't unslash.
	$post_mime_type = isset( $postarr['post_mime_type'] ) ? $postarr['post_mime_type'] : '';

	// Expected_slashed (everything!).
	$data = compact( 'post_author', 'post_date', 'post_date_gmt', 'post_content', 'post_content_filtered', 'post_title', 'post_excerpt', 'post_status', 'post_type', 'comment_status', 'ping_status', 'post_password', 'post_name', 'to_ping', 'pinged', 'post_modified', 'post_modified_gmt', 'post_parent', 'menu_order', 'post_mime_type', 'guid' );

	$emoji_fields = array( 'post_title', 'post_content', 'post_excerpt' );

	foreach ( $emoji_fields as $emoji_field ) {
		if ( isset( $data[ $emoji_field ] ) ) {
			$charset = $wpdb->get_col_charset( $wpdb->posts, $emoji_field );
			if ( 'utf8' === $charset ) {
				$data[ $emoji_field ] = wp_encode_emoji( $data[ $emoji_field ] );
			}
		}
	}

	if ( 'attachment' === $post_type ) {
		/**
		 * Filters attachment post data before it is updated in or added to the database.
		 *
		 * @since 3.9.0
		 * @since 5.4.1 `$unsanitized_postarr` argument added.
		 *
		 * @param array $data                An array of slashed, sanitized, and processed attachment post data.
		 * @param array $postarr             An array of slashed and sanitized attachment post data, but not processed.
		 * @param array $unsanitized_postarr An array of slashed yet *unsanitized* and unprocessed attachment post data
		 *                                   as originally passed to wp_insert_post().
		 */
		$data = apply_filters( 'wp_insert_attachment_data', $data, $postarr, $unsanitized_postarr );
	} else {
		/**
		 * Filters slashed post data just before it is inserted into the database.
		 *
		 * @since 2.7.0
		 * @since 5.4.1 `$unsanitized_postarr` argument added.
		 *
		 * @param array $data                An array of slashed, sanitized, and processed post data.
		 * @param array $postarr             An array of sanitized (and slashed) but otherwise unmodified post data.
		 * @param array $unsanitized_postarr An array of slashed yet *unsanitized* and unprocessed post data as
		 *                                   originally passed to wp_insert_post().
		 */
		$data = apply_filters( 'wp_insert_post_data', $data, $postarr, $unsanitized_postarr );
	}
	$data  = wp_unslash( $data );
	$where = array( 'ID' => $post_ID );

	if ( $update ) {
		/**
		 * Fires immediately before an existing post is updated in the database.
		 *
		 * @since 2.5.0
		 *
		 * @param int   $post_ID Post ID.
		 * @param array $data    Array of unslashed post data.
		 */
		do_action( 'pre_post_update', $post_ID, $data );
		if ( false === $wpdb->update( $wpdb->posts, $data, $where ) ) {
			if ( $wp_error ) {
				return new WP_Error( 'db_update_error', __( 'Could not update post in the database' ), $wpdb->last_error );
			} else {
				return 0;
			}
		}
	} else {
		// If there is a suggested ID, use it if not already present.
		if ( ! empty( $import_id ) ) {
			$import_id = (int) $import_id;
			if ( ! $wpdb->get_var( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE ID = %d", $import_id ) ) ) {
				$data['ID'] = $import_id;
			}
		}
		if ( false === $wpdb->insert( $wpdb->posts, $data ) ) {
			if ( $wp_error ) {
				return new WP_Error( 'db_insert_error', __( 'Could not insert post into the database' ), $wpdb->last_error );
			} else {
				return 0;
			}
		}
		$post_ID = (int) $wpdb->insert_id;

		// Use the newly generated $post_ID.
		$where = array( 'ID' => $post_ID );
	}

	if ( empty( $data['post_name'] ) && ! in_array( $data['post_status'], array( 'draft', 'pending', 'auto-draft' ) ) ) {
		$data['post_name'] = wp_unique_post_slug( sanitize_title( $data['post_title'], $post_ID ), $post_ID, $data['post_status'], $post_type, $post_parent );
		$wpdb->update( $wpdb->posts, array( 'post_name' => $data['post_name'] ), $where );
		clean_post_cache( $post_ID );
	}

	if ( is_object_in_taxonomy( $post_type, 'category' ) ) {
		wp_set_post_categories( $post_ID, $post_category );
	}

	if ( isset( $postarr['tags_input'] ) && is_object_in_taxonomy( $post_type, 'post_tag' ) ) {
		wp_set_post_tags( $post_ID, $postarr['tags_input'] );
	}

	// New-style support for all custom taxonomies.
	if ( ! empty( $postarr['tax_input'] ) ) {
		foreach ( $postarr['tax_input'] as $taxonomy => $tags ) {
			$taxonomy_obj = get_taxonomy( $taxonomy );
			if ( ! $taxonomy_obj ) {
				/* translators: %s: taxonomy name */
				_doing_it_wrong( __FUNCTION__, sprintf( __( 'Invalid taxonomy: %s.' ), $taxonomy ), '4.4.0' );
				continue;
			}

			// array = hierarchical, string = non-hierarchical.
			if ( is_array( $tags ) ) {
				$tags = array_filter( $tags );
			}
			if ( current_user_can( $taxonomy_obj->cap->assign_terms ) ) {
				wp_set_post_terms( $post_ID, $tags, $taxonomy );
			}
		}
	}

	if ( ! empty( $postarr['meta_input'] ) ) {
		foreach ( $postarr['meta_input'] as $field => $value ) {
			update_post_meta( $post_ID, $field, $value );
		}
	}

	$current_guid = get_post_field( 'guid', $post_ID );

	// Set GUID.
	if ( ! $update && '' == $current_guid ) {
		$wpdb->update( $wpdb->posts, array( 'guid' => get_permalink( $post_ID ) ), $where );
	}

	if ( 'attachment' === $postarr['post_type'] ) {
		if ( ! empty( $postarr['file'] ) ) {
			update_attached_file( $post_ID, $postarr['file'] );
		}

		if ( ! empty( $postarr['context'] ) ) {
			add_post_meta( $post_ID, '_wp_attachment_context', $postarr['context'], true );
		}
	}

	// Set or remove featured image.
	if ( isset( $postarr['_thumbnail_id'] ) ) {
		$thumbnail_support = current_theme_supports( 'post-thumbnails', $post_type ) && post_type_supports( $post_type, 'thumbnail' ) || 'revision' === $post_type;
		if ( ! $thumbnail_support && 'attachment' === $post_type && $post_mime_type ) {
			if ( wp_attachment_is( 'audio', $post_ID ) ) {
				$thumbnail_support = post_type_supports( 'attachment:audio', 'thumbnail' ) || current_theme_supports( 'post-thumbnails', 'attachment:audio' );
			} elseif ( wp_attachment_is( 'video', $post_ID ) ) {
				$thumbnail_support = post_type_supports( 'attachment:video', 'thumbnail' ) || current_theme_supports( 'post-thumbnails', 'attachment:video' );
			}
		}

		if ( $thumbnail_support ) {
			$thumbnail_id = intval( $postarr['_thumbnail_id'] );
			if ( -1 === $thumbnail_id ) {
				delete_post_thumbnail( $post_ID );
			} else {
				set_post_thumbnail( $post_ID, $thumbnail_id );
			}
		}
	}

	clean_post_cache( $post_ID );

	$post = get_post( $post_ID );

	if ( ! empty( $postarr['page_template'] ) ) {
		$post->page_template = $postarr['page_template'];
		$page_templates      = wp_get_theme()->get_page_templates( $post );
		if ( 'default' != $postarr['page_template'] && ! isset( $page_templates[ $postarr['page_template'] ] ) ) {
			if ( $wp_error ) {
				return new WP_Error( 'invalid_page_template', __( 'Invalid page template.' ) );
			}
			update_post_meta( $post_ID, '_wp_page_template', 'default' );
		} else {
			update_post_meta( $post_ID, '_wp_page_template', $postarr['page_template'] );
		}
	}

	if ( 'attachment' !== $postarr['post_type'] ) {
		wp_transition_post_status( $data['post_status'], $previous_status, $post );
	} else {
		if ( $update ) {
			/**
			 * Fires once an existing attachment has been updated.
			 *
			 * @since 2.0.0
			 *
			 * @param int $post_ID Attachment ID.
			 */
			do_action( 'edit_attachment', $post_ID );
			$post_after = get_post( $post_ID );

			/**
			 * Fires once an existing attachment has been updated.
			 *
			 * @since 4.4.0
			 *
			 * @param int     $post_ID      Post ID.
			 * @param WP_Post $post_after   Post object following the update.
			 * @param WP_Post $post_before  Post object before the update.
			 */
			do_action( 'attachment_updated', $post_ID, $post_after, $post_before );
		} else {

			/**
			 * Fires once an attachment has been added.
			 *
			 * @since 2.0.0
			 *
			 * @param int $post_ID Attachment ID.
			 */
			do_action( 'add_attachment', $post_ID );
		}

		return $post_ID;
	}

	if ( $update ) {
		/**
		 * Fires once an existing post has been updated.
		 *
		 * The dynamic portion of the hook name, `$post->post_type`, refers to
		 * the post type slug.
		 *
		 * @since 5.1.0
		 *
		 * @param int     $post_ID Post ID.
		 * @param WP_Post $post    Post object.
		 */
		do_action( "edit_post_{$post->post_type}", $post_ID, $post );

		/**
		 * Fires once an existing post has been updated.
		 *
		 * @since 1.2.0
		 *
		 * @param int     $post_ID Post ID.
		 * @param WP_Post $post    Post object.
		 */
		do_action( 'edit_post', $post_ID, $post );

		$post_after = get_post( $post_ID );

		/**
		 * Fires once an existing post has been updated.
		 *
		 * @since 3.0.0
		 *
		 * @param int     $post_ID      Post ID.
		 * @param WP_Post $post_after   Post object following the update.
		 * @param WP_Post $post_before  Post object before the update.
		 */
		do_action( 'post_updated', $post_ID, $post_after, $post_before );
	}

	/**
	 * Fires once a post has been saved.
	 *
	 * The dynamic portion of the hook name, `$post->post_type`, refers to
	 * the post type slug.
	 *
	 * @since 3.7.0
	 *
	 * @param int     $post_ID Post ID.
	 * @param WP_Post $post    Post object.
	 * @param bool    $update  Whether this is an existing post being updated or not.
	 */
	do_action( "save_post_{$post->post_type}", $post_ID, $post, $update );

	/**
	 * Fires once a post has been saved.
	 *
	 * @since 1.5.0
	 *
	 * @param int     $post_ID Post ID.
	 * @param WP_Post $post    Post object.
	 * @param bool    $update  Whether this is an existing post being updated or not.
	 */
	do_action( 'save_post', $post_ID, $post, $update );

	/**
	 * Fires once a post has been saved.
	 *
	 * @since 2.0.0
	 *
	 * @param int     $post_ID Post ID.
	 * @param WP_Post $post    Post object.
	 * @param bool    $update  Whether this is an existing post being updated or not.
	 */
	do_action( 'wp_insert_post', $post_ID, $post, $update );

	return $post_ID;
}

/**
 * Update a post with new post data.
 *
 * The date does not have to be set for drafts. You can set the date and it will
 * not be overridden.
 *
 * @since 1.0.0
 *
 * @param array|object $postarr  Optional. Post data. Arrays are expected to be escaped,
 *                               objects are not. Default array.
 * @param bool         $wp_error Optional. Allow return of WP_Error on failure. Default false.
 * @return int|WP_Error The value 0 or WP_Error on failure. The post ID on success.
 */
function wp_update_post( $postarr = array(), $wp_error = false ) {
	if ( is_object( $postarr ) ) {
		// Non-escaped post was passed.
		$postarr = get_object_vars( $postarr );
		$postarr = wp_slash( $postarr );
	}

	// First, get all of the original fields.
	$post = get_post( $postarr['ID'], ARRAY_A );

	if ( is_null( $post ) ) {
		if ( $wp_error ) {
			return new WP_Error( 'invalid_post', __( 'Invalid post ID.' ) );
		}
		return 0;
	}

	// Escape data pulled from DB.
	$post = wp_slash( $post );

	// Passed post category list overwrites existing category list if not empty.
	if ( isset( $postarr['post_category'] ) && is_array( $postarr['post_category'] )
			&& 0 != count( $postarr['post_category'] ) ) {
		$post_cats = $postarr['post_category'];
	} else {
		$post_cats = $post['post_category'];
	}

	// Drafts shouldn't be assigned a date unless explicitly done so by the user.
	if ( isset( $post['post_status'] ) && in_array( $post['post_status'], array( 'draft', 'pending', 'auto-draft' ) ) && empty( $postarr['edit_date'] ) &&
			( '0000-00-00 00:00:00' == $post['post_date_gmt'] ) ) {
		$clear_date = true;
	} else {
		$clear_date = false;
	}

	// Merge old and new fields with new fields overwriting old ones.
	$postarr                  = array_merge( $post, $postarr );
	$postarr['post_category'] = $post_cats;
	if ( $clear_date ) {
		$postarr['post_date']     = current_time( 'mysql' );
		$postarr['post_date_gmt'] = '';
	}

	if ( $postarr['post_type'] == 'attachment' ) {
		return wp_insert_attachment( $postarr, false, 0, $wp_error );
	}

	return wp_insert_post( $postarr, $wp_error );
}

/**
 * Publish a post by transitioning the post status.
 *
 * @since 2.1.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int|WP_Post $post Post ID or post object.
 */
function wp_publish_post( $post ) {
	global $wpdb;

	if ( ! $post = get_post( $post ) ) {
		return;
	}

	if ( 'publish' == $post->post_status ) {
		return;
	}

	$wpdb->update( $wpdb->posts, array( 'post_status' => 'publish' ), array( 'ID' => $post->ID ) );

	clean_post_cache( $post->ID );

	$old_status        = $post->post_status;
	$post->post_status = 'publish';
	wp_transition_post_status( 'publish', $old_status, $post );

	/** This action is documented in wp-includes/post.php */
	do_action( "edit_post_{$post->post_type}", $post->ID, $post );

	/** This action is documented in wp-includes/post.php */
	do_action( 'edit_post', $post->ID, $post );

	/** This action is documented in wp-includes/post.php */
	do_action( "save_post_{$post->post_type}", $post->ID, $post, true );

	/** This action is documented in wp-includes/post.php */
	do_action( 'save_post', $post->ID, $post, true );

	/** This action is documented in wp-includes/post.php */
	do_action( 'wp_insert_post', $post->ID, $post, true );
}

/**
 * Publish future post and make sure post ID has future post status.
 *
 * Invoked by cron 'publish_future_post' event. This safeguard prevents cron
 * from publishing drafts, etc.
 *
 * @since 2.5.0
 *
 * @param int|WP_Post $post_id Post ID or post object.
 */
function check_and_publish_future_post( $post_id ) {
	$post = get_post( $post_id );

	if ( empty( $post ) ) {
		return;
	}

	if ( 'future' != $post->post_status ) {
		return;
	}

	$time = strtotime( $post->post_date_gmt . ' GMT' );

	// Uh oh, someone jumped the gun!
	if ( $time > time() ) {
		wp_clear_scheduled_hook( 'publish_future_post', array( $post_id ) ); // clear anything else in the system
		wp_schedule_single_event( $time, 'publish_future_post', array( $post_id ) );
		return;
	}

	// wp_publish_post() returns no meaningful value.
	wp_publish_post( $post_id );
}

/**
 * Computes a unique slug for the post, when given the desired slug and some post details.
 *
 * @since 2.8.0
 *
 * @global wpdb       $wpdb WordPress database abstraction object.
 * @global WP_Rewrite $wp_rewrite
 *
 * @param string $slug        The desired slug (post_name).
 * @param int    $post_ID     Post ID.
 * @param string $post_status No uniqueness checks are made if the post is still draft or pending.
 * @param string $post_type   Post type.
 * @param int    $post_parent Post parent ID.
 * @return string Unique slug for the post, based on $post_name (with a -1, -2, etc. suffix)
 */
function wp_unique_post_slug( $slug, $post_ID, $post_status, $post_type, $post_parent ) {
	if ( in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ) ) || ( 'inherit' == $post_status && 'revision' == $post_type ) || 'user_request' === $post_type ) {
		return $slug;
	}

	/**
	 * Filters the post slug before it is generated to be unique.
	 *
	 * Returning a non-null value will short-circuit the
	 * unique slug generation, returning the passed value instead.
	 *
	 * @since 5.1.0
	 *
	 * @param string $override_slug Short-circuit return value.
	 * @param string $slug          The desired slug (post_name).
	 * @param int    $post_ID       Post ID.
	 * @param string $post_status   The post status.
	 * @param string $post_type     Post type.
	 * @param int    $post_parent   Post parent ID.
	 */
	$override_slug = apply_filters( 'pre_wp_unique_post_slug', null, $slug, $post_ID, $post_status, $post_type, $post_parent );
	if ( null !== $override_slug ) {
		return $override_slug;
	}

	global $wpdb, $wp_rewrite;

	$original_slug = $slug;

	$feeds = $wp_rewrite->feeds;
	if ( ! is_array( $feeds ) ) {
		$feeds = array();
	}

	if ( 'attachment' == $post_type ) {
		// Attachment slugs must be unique across all types.
		$check_sql       = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND ID != %d LIMIT 1";
		$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_ID ) );

		/**
		 * Filters whether the post slug would make a bad attachment slug.
		 *
		 * @since 3.1.0
		 *
		 * @param bool   $bad_slug Whether the slug would be bad as an attachment slug.
		 * @param string $slug     The post slug.
		 */
		if ( $post_name_check || in_array( $slug, $feeds ) || 'embed' === $slug || apply_filters( 'wp_unique_post_slug_is_bad_attachment_slug', false, $slug ) ) {
			$suffix = 2;
			do {
				$alt_post_name   = _truncate_post_slug( $slug, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix";
				$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_ID ) );
				$suffix++;
			} while ( $post_name_check );
			$slug = $alt_post_name;
		}
	} elseif ( is_post_type_hierarchical( $post_type ) ) {
		if ( 'nav_menu_item' == $post_type ) {
			return $slug;
		}

		/*
		 * Page slugs must be unique within their own trees. Pages are in a separate
		 * namespace than posts so page slugs are allowed to overlap post slugs.
		 */
		$check_sql       = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND post_type IN ( %s, 'attachment' ) AND ID != %d AND post_parent = %d LIMIT 1";
		$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_type, $post_ID, $post_parent ) );

		/**
		 * Filters whether the post slug would make a bad hierarchical post slug.
		 *
		 * @since 3.1.0
		 *
		 * @param bool   $bad_slug    Whether the post slug would be bad in a hierarchical post context.
		 * @param string $slug        The post slug.
		 * @param string $post_type   Post type.
		 * @param int    $post_parent Post parent ID.
		 */
		if ( $post_name_check || in_array( $slug, $feeds ) || 'embed' === $slug || preg_match( "@^($wp_rewrite->pagination_base)?\d+$@", $slug ) || apply_filters( 'wp_unique_post_slug_is_bad_hierarchical_slug', false, $slug, $post_type, $post_parent ) ) {
			$suffix = 2;
			do {
				$alt_post_name   = _truncate_post_slug( $slug, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix";
				$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_type, $post_ID, $post_parent ) );
				$suffix++;
			} while ( $post_name_check );
			$slug = $alt_post_name;
		}
	} else {
		// Post slugs must be unique across all posts.
		$check_sql       = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND post_type = %s AND ID != %d LIMIT 1";
		$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_type, $post_ID ) );

		// Prevent new post slugs that could result in URLs that conflict with date archives.
		$post                        = get_post( $post_ID );
		$conflicts_with_date_archive = false;
		if ( 'post' === $post_type && ( ! $post || $post->post_name !== $slug ) && preg_match( '/^[0-9]+$/', $slug ) && $slug_num = intval( $slug ) ) {
			$permastructs   = array_values( array_filter( explode( '/', get_option( 'permalink_structure' ) ) ) );
			$postname_index = array_search( '%postname%', $permastructs );

			/*
			 * Potential date clashes are as follows:
			 *
			 * - Any integer in the first permastruct position could be a year.
			 * - An integer between 1 and 12 that follows 'year' conflicts with 'monthnum'.
			 * - An integer between 1 and 31 that follows 'monthnum' conflicts with 'day'.
			 */
			if ( 0 === $postname_index ||
				( $postname_index && '%year%' === $permastructs[ $postname_index - 1 ] && 13 > $slug_num ) ||
				( $postname_index && '%monthnum%' === $permastructs[ $postname_index - 1 ] && 32 > $slug_num )
			) {
				$conflicts_with_date_archive = true;
			}
		}

		/**
		 * Filters whether the post slug would be bad as a flat slug.
		 *
		 * @since 3.1.0
		 *
		 * @param bool   $bad_slug  Whether the post slug would be bad as a flat slug.
		 * @param string $slug      The post slug.
		 * @param string $post_type Post type.
		 */
		if ( $post_name_check || in_array( $slug, $feeds ) || 'embed' === $slug || $conflicts_with_date_archive || apply_filters( 'wp_unique_post_slug_is_bad_flat_slug', false, $slug, $post_type ) ) {
			$suffix = 2;
			do {
				$alt_post_name   = _truncate_post_slug( $slug, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix";
				$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_type, $post_ID ) );
				$suffix++;
			} while ( $post_name_check );
			$slug = $alt_post_name;
		}
	}

	/**
	 * Filters the unique post slug.
	 *
	 * @since 3.3.0
	 *
	 * @param string $slug          The post slug.
	 * @param int    $post_ID       Post ID.
	 * @param string $post_status   The post status.
	 * @param string $post_type     Post type.
	 * @param int    $post_parent   Post parent ID
	 * @param string $original_slug The original post slug.
	 */
	return apply_filters( 'wp_unique_post_slug', $slug, $post_ID, $post_status, $post_type, $post_parent, $original_slug );
}

/**
 * Truncate a post slug.
 *
 * @since 3.6.0
 * @access private
 *
 * @see utf8_uri_encode()
 *
 * @param string $slug   The slug to truncate.
 * @param int    $length Optional. Max length of the slug. Default 200 (characters).
 * @return string The truncated slug.
 */
function _truncate_post_slug( $slug, $length = 200 ) {
	if ( strlen( $slug ) > $length ) {
		$decoded_slug = urldecode( $slug );
		if ( $decoded_slug === $slug ) {
			$slug = substr( $slug, 0, $length );
		} else {
			$slug = utf8_uri_encode( $decoded_slug, $length, true );
		}
	}

	return rtrim( $slug, '-' );
}

/**
 * Add tags to a post.
 *
 * @see wp_set_post_tags()
 *
 * @since 2.3.0
 *
 * @param int          $post_id Optional. The Post ID. Does not default to the ID of the global $post.
 * @param string|array $tags    Optional. An array of tags to set for the post, or a string of tags
 *                              separated by commas. Default empty.
 * @return array|false|WP_Error Array of affected term IDs. WP_Error or false on failure.
 */
function wp_add_post_tags( $post_id = 0, $tags = '' ) {
	return wp_set_post_tags( $post_id, $tags, true );
}

/**
 * Set the tags for a post.
 *
 * @since 2.3.0
 *
 * @see wp_set_object_terms()
 *
 * @param int          $post_id Optional. The Post ID. Does not default to the ID of the global $post.
 * @param string|array $tags    Optional. An array of tags to set for the post, or a string of tags
 *                              separated by commas. Default empty.
 * @param bool         $append  Optional. If true, don't delete existing tags, just add on. If false,
 *                              replace the tags with the new tags. Default false.
 * @return array|false|WP_Error Array of term taxonomy IDs of affected terms. WP_Error or false on failure.
 */
function wp_set_post_tags( $post_id = 0, $tags = '', $append = false ) {
	return wp_set_post_terms( $post_id, $tags, 'post_tag', $append );
}

/**
 * Set the terms for a post.
 *
 * @since 2.8.0
 *
 * @see wp_set_object_terms()
 *
 * @param int          $post_id  Optional. The Post ID. Does not default to the ID of the global $post.
 * @param string|array $tags     Optional. An array of terms to set for the post, or a string of terms
 *                               separated by commas. Hierarchical taxonomies must always pass IDs rather
 *                               than names so that children with the same names but different parents
 *                               aren't confused. Default empty.
 * @param string       $taxonomy Optional. Taxonomy name. Default 'post_tag'.
 * @param bool         $append   Optional. If true, don't delete existing terms, just add on. If false,
 *                               replace the terms with the new terms. Default false.
 * @return array|false|WP_Error Array of term taxonomy IDs of affected terms. WP_Error or false on failure.
 */
function wp_set_post_terms( $post_id = 0, $tags = '', $taxonomy = 'post_tag', $append = false ) {
	$post_id = (int) $post_id;

	if ( ! $post_id ) {
		return false;
	}

	if ( empty( $tags ) ) {
		$tags = array();
	}

	if ( ! is_array( $tags ) ) {
		$comma = _x( ',', 'tag delimiter' );
		if ( ',' !== $comma ) {
			$tags = str_replace( $comma, ',', $tags );
		}
		$tags = explode( ',', trim( $tags, " \n\t\r\0\x0B," ) );
	}

	/*
	 * Hierarchical taxonomies must always pass IDs rather than names so that
	 * children with the same names but different parents aren't confused.
	 */
	if ( is_taxonomy_hierarchical( $taxonomy ) ) {
		$tags = array_unique( array_map( 'intval', $tags ) );
	}

	return wp_set_object_terms( $post_id, $tags, $taxonomy, $append );
}

/**
 * Set categories for a post.
 *
 * If the post categories parameter is not set, then the default category is
 * going used.
 *
 * @since 2.1.0
 *
 * @param int       $post_ID         Optional. The Post ID. Does not default to the ID
 *                                   of the global $post. Default 0.
 * @param array|int $post_categories Optional. List of category IDs, or the ID of a single category.
 *                                   Default empty array.
 * @param bool      $append          If true, don't delete existing categories, just add on.
 *                                   If false, replace the categories with the new categories.
 * @return array|false|WP_Error Array of term taxonomy IDs of affected categories. WP_Error or false on failure.
 */
function wp_set_post_categories( $post_ID = 0, $post_categories = array(), $append = false ) {
	$post_ID     = (int) $post_ID;
	$post_type   = get_post_type( $post_ID );
	$post_status = get_post_status( $post_ID );
	// If $post_categories isn't already an array, make it one:
	$post_categories = (array) $post_categories;
	if ( empty( $post_categories ) ) {
		if ( 'post' == $post_type && 'auto-draft' != $post_status ) {
			$post_categories = array( get_option( 'default_category' ) );
			$append          = false;
		} else {
			$post_categories = array();
		}
	} elseif ( 1 == count( $post_categories ) && '' == reset( $post_categories ) ) {
		return true;
	}

	return wp_set_post_terms( $post_ID, $post_categories, 'category', $append );
}

/**
 * Fires actions related to the transitioning of a post's status.
 *
 * When a post is saved, the post status is "transitioned" from one status to another,
 * though this does not always mean the status has actually changed before and after
 * the save. This function fires a number of action hooks related to that transition:
 * the generic {@see 'transition_post_status'} action, as well as the dynamic hooks
 * {@see '$old_status_to_$new_status'} and {@see '$new_status_$post->post_type'}. Note
 * that the function does not transition the post object in the database.
 *
 * For instance: When publishing a post for the first time, the post status may transition
 * from 'draft' – or some other status – to 'publish'. However, if a post is already
 * published and is simply being updated, the "old" and "new" statuses may both be 'publish'
 * before and after the transition.
 *
 * @since 2.3.0
 *
 * @param string  $new_status Transition to this post status.
 * @param string  $old_status Previous post status.
 * @param WP_Post $post Post data.
 */
function wp_transition_post_status( $new_status, $old_status, $post ) {
	/**
	 * Fires when a post is transitioned from one status to another.
	 *
	 * @since 2.3.0
	 *
	 * @param string  $new_status New post status.
	 * @param string  $old_status Old post status.
	 * @param WP_Post $post       Post object.
	 */
	do_action( 'transition_post_status', $new_status, $old_status, $post );

	/**
	 * Fires when a post is transitioned from one status to another.
	 *
	 * The dynamic portions of the hook name, `$new_status` and `$old status`,
	 * refer to the old and new post statuses, respectively.
	 *
	 * @since 2.3.0
	 *
	 * @param WP_Post $post Post object.
	 */
	do_action( "{$old_status}_to_{$new_status}", $post );

	/**
	 * Fires when a post is transitioned from one status to another.
	 *
	 * The dynamic portions of the hook name, `$new_status` and `$post->post_type`,
	 * refer to the new post status and post type, respectively.
	 *
	 * Please note: When this action is hooked using a particular post status (like
	 * 'publish', as `publish_{$post->post_type}`), it will fire both when a post is
	 * first transitioned to that status from something else, as well as upon
	 * subsequent post updates (old and new status are both the same).
	 *
	 * Therefore, if you are looking to only fire a callback when a post is first
	 * transitioned to a status, use the {@see 'transition_post_status'} hook instead.
	 *
	 * @since 2.3.0
	 *
	 * @param int     $post_id Post ID.
	 * @param WP_Post $post    Post object.
	 */
	do_action( "{$new_status}_{$post->post_type}", $post->ID, $post );
}

//
// Comment, trackback, and pingback functions.
//

/**
 * Add a URL to those already pinged.
 *
 * @since 1.5.0
 * @since 4.7.0 `$post_id` can be a WP_Post object.
 * @since 4.7.0 `$uri` can be an array of URIs.
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int|WP_Post  $post_id Post object or ID.
 * @param string|array $uri     Ping URI or array of URIs.
 * @return int|false How many rows were updated.
 */
function add_ping( $post_id, $uri ) {
	global $wpdb;

	$post = get_post( $post_id );
	if ( ! $post ) {
		return false;
	}

	$pung = trim( $post->pinged );
	$pung = preg_split( '/\s/', $pung );

	if ( is_array( $uri ) ) {
		$pung = array_merge( $pung, $uri );
	} else {
		$pung[] = $uri;
	}
	$new = implode( "\n", $pung );

	/**
	 * Filters the new ping URL to add for the given post.
	 *
	 * @since 2.0.0
	 *
	 * @param string $new New ping URL to add.
	 */
	$new = apply_filters( 'add_ping', $new );

	$return = $wpdb->update( $wpdb->posts, array( 'pinged' => $new ), array( 'ID' => $post->ID ) );
	clean_post_cache( $post->ID );
	return $return;
}

/**
 * Retrieve enclosures already enclosed for a post.
 *
 * @since 1.5.0
 *
 * @param int $post_id Post ID.
 * @return array List of enclosures.
 */
function get_enclosed( $post_id ) {
	$custom_fields = get_post_custom( $post_id );
	$pung          = array();
	if ( ! is_array( $custom_fields ) ) {
		return $pung;
	}

	foreach ( $custom_fields as $key => $val ) {
		if ( 'enclosure' != $key || ! is_array( $val ) ) {
			continue;
		}
		foreach ( $val as $enc ) {
			$enclosure = explode( "\n", $enc );
			$pung[]    = trim( $enclosure[0] );
		}
	}

	/**
	 * Filters the list of enclosures already enclosed for the given post.
	 *
	 * @since 2.0.0
	 *
	 * @param array $pung    Array of enclosures for the given post.
	 * @param int   $post_id Post ID.
	 */
	return apply_filters( 'get_enclosed', $pung, $post_id );
}

/**
 * Retrieve URLs already pinged for a post.
 *
 * @since 1.5.0
 *
 * @since 4.7.0 `$post_id` can be a WP_Post object.
 *
 * @param int|WP_Post $post_id Post ID or object.
 * @return bool|string[] Array of URLs already pinged for the given post, false if the post is not found.
 */
function get_pung( $post_id ) {
	$post = get_post( $post_id );
	if ( ! $post ) {
		return false;
	}

	$pung = trim( $post->pinged );
	$pung = preg_split( '/\s/', $pung );

	/**
	 * Filters the list of already-pinged URLs for the given post.
	 *
	 * @since 2.0.0
	 *
	 * @param string[] $pung Array of URLs already pinged for the given post.
	 */
	return apply_filters( 'get_pung', $pung );
}

/**
 * Retrieve URLs that need to be pinged.
 *
 * @since 1.5.0
 * @since 4.7.0 `$post_id` can be a WP_Post object.
 *
 * @param int|WP_Post $post_id Post Object or ID
 * @return array
 */
function get_to_ping( $post_id ) {
	$post = get_post( $post_id );

	if ( ! $post ) {
		return false;
	}

	$to_ping = sanitize_trackback_urls( $post->to_ping );
	$to_ping = preg_split( '/\s/', $to_ping, -1, PREG_SPLIT_NO_EMPTY );

	/**
	 * Filters the list of URLs yet to ping for the given post.
	 *
	 * @since 2.0.0
	 *
	 * @param array $to_ping List of URLs yet to ping.
	 */
	return apply_filters( 'get_to_ping', $to_ping );
}

/**
 * Do trackbacks for a list of URLs.
 *
 * @since 1.0.0
 *
 * @param string $tb_list Comma separated list of URLs.
 * @param int    $post_id Post ID.
 */
function trackback_url_list( $tb_list, $post_id ) {
	if ( ! empty( $tb_list ) ) {
		// Get post data.
		$postdata = get_post( $post_id, ARRAY_A );

		// Form an excerpt.
		$excerpt = strip_tags( $postdata['post_excerpt'] ? $postdata['post_excerpt'] : $postdata['post_content'] );

		if ( strlen( $excerpt ) > 255 ) {
			$excerpt = substr( $excerpt, 0, 252 ) . '&hellip;';
		}

		$trackback_urls = explode( ',', $tb_list );
		foreach ( (array) $trackback_urls as $tb_url ) {
			$tb_url = trim( $tb_url );
			trackback( $tb_url, wp_unslash( $postdata['post_title'] ), $excerpt, $post_id );
		}
	}
}

//
// Page functions
//

/**
 * Get a list of page IDs.
 *
 * @since 2.0.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @return array List of page IDs.
 */
function get_all_page_ids() {
	global $wpdb;

	$page_ids = wp_cache_get( 'all_page_ids', 'posts' );
	if ( ! is_array( $page_ids ) ) {
		$page_ids = $wpdb->get_col( "SELECT ID FROM $wpdb->posts WHERE post_type = 'page'" );
		wp_cache_add( 'all_page_ids', $page_ids, 'posts' );
	}

	return $page_ids;
}

/**
 * Retrieves page data given a page ID or page object.
 *
 * Use get_post() instead of get_page().
 *
 * @since 1.5.1
 * @deprecated 3.5.0 Use get_post()
 *
 * @param mixed  $page   Page object or page ID. Passed by reference.
 * @param string $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
 *                       a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
 * @param string $filter Optional. How the return value should be filtered. Accepts 'raw',
 *                       'edit', 'db', 'display'. Default 'raw'.
 * @return WP_Post|array|null WP_Post (or array) on success, or null on failure.
 */
function get_page( $page, $output = OBJECT, $filter = 'raw' ) {
	return get_post( $page, $output, $filter );
}

/**
 * Retrieves a page given its path.
 *
 * @since 2.1.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string       $page_path Page path.
 * @param string       $output    Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
 *                                a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
 * @param string|array $post_type Optional. Post type or array of post types. Default 'page'.
 * @return WP_Post|array|null WP_Post (or array) on success, or null on failure.
 */
function get_page_by_path( $page_path, $output = OBJECT, $post_type = 'page' ) {
	global $wpdb;

	$last_changed = wp_cache_get_last_changed( 'posts' );

	$hash      = md5( $page_path . serialize( $post_type ) );
	$cache_key = "get_page_by_path:$hash:$last_changed";
	$cached    = wp_cache_get( $cache_key, 'posts' );
	if ( false !== $cached ) {
		// Special case: '0' is a bad `$page_path`.
		if ( '0' === $cached || 0 === $cached ) {
			return;
		} else {
			return get_post( $cached, $output );
		}
	}

	$page_path     = rawurlencode( urldecode( $page_path ) );
	$page_path     = str_replace( '%2F', '/', $page_path );
	$page_path     = str_replace( '%20', ' ', $page_path );
	$parts         = explode( '/', trim( $page_path, '/' ) );
	$parts         = array_map( 'sanitize_title_for_query', $parts );
	$escaped_parts = esc_sql( $parts );

	$in_string = "'" . implode( "','", $escaped_parts ) . "'";

	if ( is_array( $post_type ) ) {
		$post_types = $post_type;
	} else {
		$post_types = array( $post_type, 'attachment' );
	}

	$post_types          = esc_sql( $post_types );
	$post_type_in_string = "'" . implode( "','", $post_types ) . "'";
	$sql                 = "
		SELECT ID, post_name, post_parent, post_type
		FROM $wpdb->posts
		WHERE post_name IN ($in_string)
		AND post_type IN ($post_type_in_string)
	";

	$pages = $wpdb->get_results( $sql, OBJECT_K );

	$revparts = array_reverse( $parts );

	$foundid = 0;
	foreach ( (array) $pages as $page ) {
		if ( $page->post_name == $revparts[0] ) {
			$count = 0;
			$p     = $page;

			/*
			 * Loop through the given path parts from right to left,
			 * ensuring each matches the post ancestry.
			 */
			while ( $p->post_parent != 0 && isset( $pages[ $p->post_parent ] ) ) {
				$count++;
				$parent = $pages[ $p->post_parent ];
				if ( ! isset( $revparts[ $count ] ) || $parent->post_name != $revparts[ $count ] ) {
					break;
				}
				$p = $parent;
			}

			if ( $p->post_parent == 0 && $count + 1 == count( $revparts ) && $p->post_name == $revparts[ $count ] ) {
				$foundid = $page->ID;
				if ( $page->post_type == $post_type ) {
					break;
				}
			}
		}
	}

	// We cache misses as well as hits.
	wp_cache_set( $cache_key, $foundid, 'posts' );

	if ( $foundid ) {
		return get_post( $foundid, $output );
	}
}

/**
 * Retrieve a page given its title.
 *
 * @since 2.1.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string       $page_title Page title
 * @param string       $output     Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
 *                                 a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
 * @param string|array $post_type  Optional. Post type or array of post types. Default 'page'.
 * @return WP_Post|array|null WP_Post (or array) on success, or null on failure.
 */
function get_page_by_title( $page_title, $output = OBJECT, $post_type = 'page' ) {
	global $wpdb;

	if ( is_array( $post_type ) ) {
		$post_type           = esc_sql( $post_type );
		$post_type_in_string = "'" . implode( "','", $post_type ) . "'";
		$sql                 = $wpdb->prepare(
			"
			SELECT ID
			FROM $wpdb->posts
			WHERE post_title = %s
			AND post_type IN ($post_type_in_string)
		",
			$page_title
		);
	} else {
		$sql = $wpdb->prepare(
			"
			SELECT ID
			FROM $wpdb->posts
			WHERE post_title = %s
			AND post_type = %s
		",
			$page_title,
			$post_type
		);
	}

	$page = $wpdb->get_var( $sql );

	if ( $page ) {
		return get_post( $page, $output );
	}
}

/**
 * Identify descendants of a given page ID in a list of page objects.
 *
 * Descendants are identified from the `$pages` array passed to the function. No database queries are performed.
 *
 * @since 1.5.1
 *
 * @param int   $page_id Page ID.
 * @param array $pages   List of page objects from which descendants should be identified.
 * @return array List of page children.
 */
function get_page_children( $page_id, $pages ) {
	// Build a hash of ID -> children.
	$children = array();
	foreach ( (array) $pages as $page ) {
		$children[ intval( $page->post_parent ) ][] = $page;
	}

	$page_list = array();

	// Start the search by looking at immediate children.
	if ( isset( $children[ $page_id ] ) ) {
		// Always start at the end of the stack in order to preserve original `$pages` order.
		$to_look = array_reverse( $children[ $page_id ] );

		while ( $to_look ) {
			$p           = array_pop( $to_look );
			$page_list[] = $p;
			if ( isset( $children[ $p->ID ] ) ) {
				foreach ( array_reverse( $children[ $p->ID ] ) as $child ) {
					// Append to the `$to_look` stack to descend the tree.
					$to_look[] = $child;
				}
			}
		}
	}

	return $page_list;
}

/**
 * Order the pages with children under parents in a flat list.
 *
 * It uses auxiliary structure to hold parent-children relationships and
 * runs in O(N) complexity
 *
 * @since 2.0.0
 *
 * @param array $pages   Posts array (passed by reference).
 * @param int   $page_id Optional. Parent page ID. Default 0.
 * @return array A list arranged by hierarchy. Children immediately follow their parents.
 */
function get_page_hierarchy( &$pages, $page_id = 0 ) {
	if ( empty( $pages ) ) {
		return array();
	}

	$children = array();
	foreach ( (array) $pages as $p ) {
		$parent_id                = intval( $p->post_parent );
		$children[ $parent_id ][] = $p;
	}

	$result = array();
	_page_traverse_name( $page_id, $children, $result );

	return $result;
}

/**
 * Traverse and return all the nested children post names of a root page.
 *
 * $children contains parent-children relations
 *
 * @since 2.9.0
 * @access private
 *
 * @see _page_traverse_name()
 *
 * @param int   $page_id   Page ID.
 * @param array $children  Parent-children relations (passed by reference).
 * @param array $result    Result (passed by reference).
 */
function _page_traverse_name( $page_id, &$children, &$result ) {
	if ( isset( $children[ $page_id ] ) ) {
		foreach ( (array) $children[ $page_id ] as $child ) {
			$result[ $child->ID ] = $child->post_name;
			_page_traverse_name( $child->ID, $children, $result );
		}
	}
}

/**
 * Build the URI path for a page.
 *
 * Sub pages will be in the "directory" under the parent page post name.
 *
 * @since 1.5.0
 * @since 4.6.0 Converted the `$page` parameter to optional.
 *
 * @param WP_Post|object|int $page Optional. Page ID or WP_Post object. Default is global $post.
 * @return string|false Page URI, false on error.
 */
function get_page_uri( $page = 0 ) {
	if ( ! $page instanceof WP_Post ) {
		$page = get_post( $page );
	}

	if ( ! $page ) {
		return false;
	}

	$uri = $page->post_name;

	foreach ( $page->ancestors as $parent ) {
		$parent = get_post( $parent );
		if ( $parent && $parent->post_name ) {
			$uri = $parent->post_name . '/' . $uri;
		}
	}

	/**
	 * Filters the URI for a page.
	 *
	 * @since 4.4.0
	 *
	 * @param string  $uri  Page URI.
	 * @param WP_Post $page Page object.
	 */
	return apply_filters( 'get_page_uri', $uri, $page );
}

/**
 * Retrieve a list of pages (or hierarchical post type items).
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @since 1.5.0
 *
 * @param array|string $args {
 *     Optional. Array or string of arguments to retrieve pages.
 *
 *     @type int          $child_of     Page ID to return child and grandchild pages of. Note: The value
 *                                      of `$hierarchical` has no bearing on whether `$child_of` returns
 *                                      hierarchical results. Default 0, or no restriction.
 *     @type string       $sort_order   How to sort retrieved pages. Accepts 'ASC', 'DESC'. Default 'ASC'.
 *     @type string       $sort_column  What columns to sort pages by, comma-separated. Accepts 'post_author',
 *                                      'post_date', 'post_title', 'post_name', 'post_modified', 'menu_order',
 *                                      'post_modified_gmt', 'post_parent', 'ID', 'rand', 'comment_count'.
 *                                      'post_' can be omitted for any values that start with it.
 *                                      Default 'post_title'.
 *     @type bool         $hierarchical Whether to return pages hierarchically. If false in conjunction with
 *                                      `$child_of` also being false, both arguments will be disregarded.
 *                                      Default true.
 *     @type array        $exclude      Array of page IDs to exclude. Default empty array.
 *     @type array        $include      Array of page IDs to include. Cannot be used with `$child_of`,
 *                                      `$parent`, `$exclude`, `$meta_key`, `$meta_value`, or `$hierarchical`.
 *                                      Default empty array.
 *     @type string       $meta_key     Only include pages with this meta key. Default empty.
 *     @type string       $meta_value   Only include pages with this meta value. Requires `$meta_key`.
 *                                      Default empty.
 *     @type string       $authors      A comma-separated list of author IDs. Default empty.
 *     @type int          $parent       Page ID to return direct children of. Default -1, or no restriction.
 *     @type string|array $exclude_tree Comma-separated string or array of page IDs to exclude.
 *                                      Default empty array.
 *     @type int          $number       The number of pages to return. Default 0, or all pages.
 *     @type int          $offset       The number of pages to skip before returning. Requires `$number`.
 *                                      Default 0.
 *     @type string       $post_type    The post type to query. Default 'page'.
 *     @type string|array $post_status  A comma-separated list or array of post statuses to include.
 *                                      Default 'publish'.
 * }
 * @return array|false List of pages matching defaults or `$args`.
 */
function get_pages( $args = array() ) {
	global $wpdb;

	$defaults = array(
		'child_of'     => 0,
		'sort_order'   => 'ASC',
		'sort_column'  => 'post_title',
		'hierarchical' => 1,
		'exclude'      => array(),
		'include'      => array(),
		'meta_key'     => '',
		'meta_value'   => '',
		'authors'      => '',
		'parent'       => -1,
		'exclude_tree' => array(),
		'number'       => '',
		'offset'       => 0,
		'post_type'    => 'page',
		'post_status'  => 'publish',
	);

	$r = wp_parse_args( $args, $defaults );

	$number       = (int) $r['number'];
	$offset       = (int) $r['offset'];
	$child_of     = (int) $r['child_of'];
	$hierarchical = $r['hierarchical'];
	$exclude      = $r['exclude'];
	$meta_key     = $r['meta_key'];
	$meta_value   = $r['meta_value'];
	$parent       = $r['parent'];
	$post_status  = $r['post_status'];

	// Make sure the post type is hierarchical.
	$hierarchical_post_types = get_post_types( array( 'hierarchical' => true ) );
	if ( ! in_array( $r['post_type'], $hierarchical_post_types ) ) {
		return false;
	}

	if ( $parent > 0 && ! $child_of ) {
		$hierarchical = false;
	}

	// Make sure we have a valid post status.
	if ( ! is_array( $post_status ) ) {
		$post_status = explode( ',', $post_status );
	}
	if ( array_diff( $post_status, get_post_stati() ) ) {
		return false;
	}

	// $args can be whatever, only use the args defined in defaults to compute the key.
	$key          = md5( serialize( wp_array_slice_assoc( $r, array_keys( $defaults ) ) ) );
	$last_changed = wp_cache_get_last_changed( 'posts' );

	$cache_key = "get_pages:$key:$last_changed";
	$cache     = wp_cache_get( $cache_key, 'posts' );
	if ( false !== $cache ) {
		// Convert to WP_Post instances.
		$pages = array_map( 'get_post', $cache );
		/** This filter is documented in wp-includes/post.php */
		$pages = apply_filters( 'get_pages', $pages, $r );
		return $pages;
	}

	$inclusions = '';
	if ( ! empty( $r['include'] ) ) {
		$child_of     = 0; //ignore child_of, parent, exclude, meta_key, and meta_value params if using include
		$parent       = -1;
		$exclude      = '';
		$meta_key     = '';
		$meta_value   = '';
		$hierarchical = false;
		$incpages     = wp_parse_id_list( $r['include'] );
		if ( ! empty( $incpages ) ) {
			$inclusions = ' AND ID IN (' . implode( ',', $incpages ) . ')';
		}
	}

	$exclusions = '';
	if ( ! empty( $exclude ) ) {
		$expages = wp_parse_id_list( $exclude );
		if ( ! empty( $expages ) ) {
			$exclusions = ' AND ID NOT IN (' . implode( ',', $expages ) . ')';
		}
	}

	$author_query = '';
	if ( ! empty( $r['authors'] ) ) {
		$post_authors = wp_parse_list( $r['authors'] );

		if ( ! empty( $post_authors ) ) {
			foreach ( $post_authors as $post_author ) {
				//Do we have an author id or an author login?
				if ( 0 == intval( $post_author ) ) {
					$post_author = get_user_by( 'login', $post_author );
					if ( empty( $post_author ) ) {
						continue;
					}
					if ( empty( $post_author->ID ) ) {
						continue;
					}
					$post_author = $post_author->ID;
				}

				if ( '' == $author_query ) {
					$author_query = $wpdb->prepare( ' post_author = %d ', $post_author );
				} else {
					$author_query .= $wpdb->prepare( ' OR post_author = %d ', $post_author );
				}
			}
			if ( '' != $author_query ) {
				$author_query = " AND ($author_query)";
			}
		}
	}

	$join  = '';
	$where = "$exclusions $inclusions ";
	if ( '' !== $meta_key || '' !== $meta_value ) {
		$join = " LEFT JOIN $wpdb->postmeta ON ( $wpdb->posts.ID = $wpdb->postmeta.post_id )";

		// meta_key and meta_value might be slashed
		$meta_key   = wp_unslash( $meta_key );
		$meta_value = wp_unslash( $meta_value );
		if ( '' !== $meta_key ) {
			$where .= $wpdb->prepare( " AND $wpdb->postmeta.meta_key = %s", $meta_key );
		}
		if ( '' !== $meta_value ) {
			$where .= $wpdb->prepare( " AND $wpdb->postmeta.meta_value = %s", $meta_value );
		}
	}

	if ( is_array( $parent ) ) {
		$post_parent__in = implode( ',', array_map( 'absint', (array) $parent ) );
		if ( ! empty( $post_parent__in ) ) {
			$where .= " AND post_parent IN ($post_parent__in)";
		}
	} elseif ( $parent >= 0 ) {
		$where .= $wpdb->prepare( ' AND post_parent = %d ', $parent );
	}

	if ( 1 == count( $post_status ) ) {
		$where_post_type = $wpdb->prepare( 'post_type = %s AND post_status = %s', $r['post_type'], reset( $post_status ) );
	} else {
		$post_status     = implode( "', '", $post_status );
		$where_post_type = $wpdb->prepare( "post_type = %s AND post_status IN ('$post_status')", $r['post_type'] );
	}

	$orderby_array = array();
	$allowed_keys  = array(
		'author',
		'post_author',
		'date',
		'post_date',
		'title',
		'post_title',
		'name',
		'post_name',
		'modified',
		'post_modified',
		'modified_gmt',
		'post_modified_gmt',
		'menu_order',
		'parent',
		'post_parent',
		'ID',
		'rand',
		'comment_count',
	);

	foreach ( explode( ',', $r['sort_column'] ) as $orderby ) {
		$orderby = trim( $orderby );
		if ( ! in_array( $orderby, $allowed_keys ) ) {
			continue;
		}

		switch ( $orderby ) {
			case 'menu_order':
				break;
			case 'ID':
				$orderby = "$wpdb->posts.ID";
				break;
			case 'rand':
				$orderby = 'RAND()';
				break;
			case 'comment_count':
				$orderby = "$wpdb->posts.comment_count";
				break;
			default:
				if ( 0 === strpos( $orderby, 'post_' ) ) {
					$orderby = "$wpdb->posts." . $orderby;
				} else {
					$orderby = "$wpdb->posts.post_" . $orderby;
				}
		}

		$orderby_array[] = $orderby;

	}
	$sort_column = ! empty( $orderby_array ) ? implode( ',', $orderby_array ) : "$wpdb->posts.post_title";

	$sort_order = strtoupper( $r['sort_order'] );
	if ( '' !== $sort_order && ! in_array( $sort_order, array( 'ASC', 'DESC' ) ) ) {
		$sort_order = 'ASC';
	}

	$query  = "SELECT * FROM $wpdb->posts $join WHERE ($where_post_type) $where ";
	$query .= $author_query;
	$query .= ' ORDER BY ' . $sort_column . ' ' . $sort_order;

	if ( ! empty( $number ) ) {
		$query .= ' LIMIT ' . $offset . ',' . $number;
	}

	$pages = $wpdb->get_results( $query );

	if ( empty( $pages ) ) {
		wp_cache_set( $cache_key, array(), 'posts' );

		/** This filter is documented in wp-includes/post.php */
		$pages = apply_filters( 'get_pages', array(), $r );
		return $pages;
	}

	// Sanitize before caching so it'll only get done once.
	$num_pages = count( $pages );
	for ( $i = 0; $i < $num_pages; $i++ ) {
		$pages[ $i ] = sanitize_post( $pages[ $i ], 'raw' );
	}

	// Update cache.
	update_post_cache( $pages );

	if ( $child_of || $hierarchical ) {
		$pages = get_page_children( $child_of, $pages );
	}

	if ( ! empty( $r['exclude_tree'] ) ) {
		$exclude = wp_parse_id_list( $r['exclude_tree'] );
		foreach ( $exclude as $id ) {
			$children = get_page_children( $id, $pages );
			foreach ( $children as $child ) {
				$exclude[] = $child->ID;
			}
		}

		$num_pages = count( $pages );
		for ( $i = 0; $i < $num_pages; $i++ ) {
			if ( in_array( $pages[ $i ]->ID, $exclude ) ) {
				unset( $pages[ $i ] );
			}
		}
	}

	$page_structure = array();
	foreach ( $pages as $page ) {
		$page_structure[] = $page->ID;
	}

	wp_cache_set( $cache_key, $page_structure, 'posts' );

	// Convert to WP_Post instances
	$pages = array_map( 'get_post', $pages );

	/**
	 * Filters the retrieved list of pages.
	 *
	 * @since 2.1.0
	 *
	 * @param array $pages List of pages to retrieve.
	 * @param array $r     Array of get_pages() arguments.
	 */
	return apply_filters( 'get_pages', $pages, $r );
}

//
// Attachment functions
//

/**
 * Determines whether an attachment URI is local and really an attachment.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 2.0.0
 *
 * @param string $url URL to check
 * @return bool True on success, false on failure.
 */
function is_local_attachment( $url ) {
	if ( strpos( $url, home_url() ) === false ) {
		return false;
	}
	if ( strpos( $url, home_url( '/?attachment_id=' ) ) !== false ) {
		return true;
	}
	if ( $id = url_to_postid( $url ) ) {
		$post = get_post( $id );
		if ( 'attachment' == $post->post_type ) {
			return true;
		}
	}
	return false;
}

/**
 * Insert an attachment.
 *
 * If you set the 'ID' in the $args parameter, it will mean that you are
 * updating and attempt to update the attachment. You can also set the
 * attachment name or title by setting the key 'post_name' or 'post_title'.
 *
 * You can set the dates for the attachment manually by setting the 'post_date'
 * and 'post_date_gmt' keys' values.
 *
 * By default, the comments will use the default settings for whether the
 * comments are allowed. You can close them manually or keep them open by
 * setting the value for the 'comment_status' key.
 *
 * @since 2.0.0
 * @since 4.7.0 Added the `$wp_error` parameter to allow a WP_Error to be returned on failure.
 *
 * @see wp_insert_post()
 *
 * @param string|array $args     Arguments for inserting an attachment.
 * @param string       $file     Optional. Filename.
 * @param int          $parent   Optional. Parent post ID.
 * @param bool         $wp_error Optional. Whether to return a WP_Error on failure. Default false.
 * @return int|WP_Error The attachment ID on success. The value 0 or WP_Error on failure.
 */
function wp_insert_attachment( $args, $file = false, $parent = 0, $wp_error = false ) {
	$defaults = array(
		'file'        => $file,
		'post_parent' => 0,
	);

	$data = wp_parse_args( $args, $defaults );

	if ( ! empty( $parent ) ) {
		$data['post_parent'] = $parent;
	}

	$data['post_type'] = 'attachment';

	return wp_insert_post( $data, $wp_error );
}

/**
 * Trash or delete an attachment.
 *
 * When an attachment is permanently deleted, the file will also be removed.
 * Deletion removes all post meta fields, taxonomy, comments, etc. associated
 * with the attachment (except the main post).
 *
 * The attachment is moved to the trash instead of permanently deleted unless trash
 * for media is disabled, item is already in the trash, or $force_delete is true.
 *
 * @since 2.0.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int  $post_id      Attachment ID.
 * @param bool $force_delete Optional. Whether to bypass trash and force deletion.
 *                           Default false.
 * @return WP_Post|false|null Post data on success, false or null on failure.
 */
function wp_delete_attachment( $post_id, $force_delete = false ) {
	global $wpdb;

	$post = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->posts WHERE ID = %d", $post_id ) );

	if ( ! $post ) {
		return $post;
	}

	$post = get_post( $post );

	if ( 'attachment' !== $post->post_type ) {
		return false;
	}

	if ( ! $force_delete && EMPTY_TRASH_DAYS && MEDIA_TRASH && 'trash' !== $post->post_status ) {
		return wp_trash_post( $post_id );
	}

	delete_post_meta( $post_id, '_wp_trash_meta_status' );
	delete_post_meta( $post_id, '_wp_trash_meta_time' );

	$meta         = wp_get_attachment_metadata( $post_id );
	$backup_sizes = get_post_meta( $post->ID, '_wp_attachment_backup_sizes', true );
	$file         = get_attached_file( $post_id );

	if ( is_multisite() ) {
		delete_transient( 'dirsize_cache' );
	}

	/**
	 * Fires before an attachment is deleted, at the start of wp_delete_attachment().
	 *
	 * @since 2.0.0
	 *
	 * @param int $post_id Attachment ID.
	 */
	do_action( 'delete_attachment', $post_id );

	wp_delete_object_term_relationships( $post_id, array( 'category', 'post_tag' ) );
	wp_delete_object_term_relationships( $post_id, get_object_taxonomies( $post->post_type ) );

	// Delete all for any posts.
	delete_metadata( 'post', null, '_thumbnail_id', $post_id, true );

	wp_defer_comment_counting( true );

	$comment_ids = $wpdb->get_col( $wpdb->prepare( "SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = %d", $post_id ) );
	foreach ( $comment_ids as $comment_id ) {
		wp_delete_comment( $comment_id, true );
	}

	wp_defer_comment_counting( false );

	$post_meta_ids = $wpdb->get_col( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE post_id = %d ", $post_id ) );
	foreach ( $post_meta_ids as $mid ) {
		delete_metadata_by_mid( 'post', $mid );
	}

	/** This action is documented in wp-includes/post.php */
	do_action( 'delete_post', $post_id );
	$result = $wpdb->delete( $wpdb->posts, array( 'ID' => $post_id ) );
	if ( ! $result ) {
		return false;
	}
	/** This action is documented in wp-includes/post.php */
	do_action( 'deleted_post', $post_id );

	wp_delete_attachment_files( $post_id, $meta, $backup_sizes, $file );

	clean_post_cache( $post );

	return $post;
}

/**
 * Deletes all files that belong to the given attachment.
 *
 * @since 4.9.7
 *
 * @param int    $post_id      Attachment ID.
 * @param array  $meta         The attachment's meta data.
 * @param array  $backup_sizes The meta data for the attachment's backup images.
 * @param string $file         Absolute path to the attachment's file.
 * @return bool True on success, false on failure.
 */
function wp_delete_attachment_files( $post_id, $meta, $backup_sizes, $file ) {
	global $wpdb;

	$uploadpath = wp_get_upload_dir();
	$deleted    = true;

	if ( ! empty( $meta['thumb'] ) ) {
		// Don't delete the thumb if another attachment uses it.
		if ( ! $wpdb->get_row( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE meta_key = '_wp_attachment_metadata' AND meta_value LIKE %s AND post_id <> %d", '%' . $wpdb->esc_like( $meta['thumb'] ) . '%', $post_id ) ) ) {
			$thumbfile = str_replace( wp_basename( $file ), $meta['thumb'], $file );
			if ( ! empty( $thumbfile ) ) {
				$thumbfile = path_join( $uploadpath['basedir'], $thumbfile );
				$thumbdir  = path_join( $uploadpath['basedir'], dirname( $file ) );

				if ( ! wp_delete_file_from_directory( $thumbfile, $thumbdir ) ) {
					$deleted = false;
				}
			}
		}
	}

	// Remove intermediate and backup images if there are any.
	if ( isset( $meta['sizes'] ) && is_array( $meta['sizes'] ) ) {
		$intermediate_dir = path_join( $uploadpath['basedir'], dirname( $file ) );
		foreach ( $meta['sizes'] as $size => $sizeinfo ) {
			$intermediate_file = str_replace( wp_basename( $file ), $sizeinfo['file'], $file );
			if ( ! empty( $intermediate_file ) ) {
				$intermediate_file = path_join( $uploadpath['basedir'], $intermediate_file );

				if ( ! wp_delete_file_from_directory( $intermediate_file, $intermediate_dir ) ) {
					$deleted = false;
				}
			}
		}
	}

	if ( is_array( $backup_sizes ) ) {
		$del_dir = path_join( $uploadpath['basedir'], dirname( $meta['file'] ) );
		foreach ( $backup_sizes as $size ) {
			$del_file = path_join( dirname( $meta['file'] ), $size['file'] );
			if ( ! empty( $del_file ) ) {
				$del_file = path_join( $uploadpath['basedir'], $del_file );

				if ( ! wp_delete_file_from_directory( $del_file, $del_dir ) ) {
					$deleted = false;
				}
			}
		}
	}

	if ( ! wp_delete_file_from_directory( $file, $uploadpath['basedir'] ) ) {
		$deleted = false;
	}

	return $deleted;
}

/**
 * Retrieve attachment meta field for attachment ID.
 *
 * @since 2.1.0
 *
 * @param int  $attachment_id Attachment post ID. Defaults to global $post.
 * @param bool $unfiltered    Optional. If true, filters are not run. Default false.
 * @return mixed Attachment meta field. False on failure.
 */
function wp_get_attachment_metadata( $attachment_id = 0, $unfiltered = false ) {
	$attachment_id = (int) $attachment_id;
	if ( ! $post = get_post( $attachment_id ) ) {
		return false;
	}

	$data = get_post_meta( $post->ID, '_wp_attachment_metadata', true );

	if ( $unfiltered ) {
		return $data;
	}

	/**
	 * Filters the attachment meta data.
	 *
	 * @since 2.1.0
	 *
	 * @param array|bool $data          Array of meta data for the given attachment, or false
	 *                                  if the object does not exist.
	 * @param int        $attachment_id Attachment post ID.
	 */
	return apply_filters( 'wp_get_attachment_metadata', $data, $post->ID );
}

/**
 * Update metadata for an attachment.
 *
 * @since 2.1.0
 *
 * @param int   $attachment_id Attachment post ID.
 * @param array $data          Attachment meta data.
 * @return int|bool False if $post is invalid.
 */
function wp_update_attachment_metadata( $attachment_id, $data ) {
	$attachment_id = (int) $attachment_id;
	if ( ! $post = get_post( $attachment_id ) ) {
		return false;
	}

	/**
	 * Filters the updated attachment meta data.
	 *
	 * @since 2.1.0
	 *
	 * @param array $data          Array of updated attachment meta data.
	 * @param int   $attachment_id Attachment post ID.
	 */
	if ( $data = apply_filters( 'wp_update_attachment_metadata', $data, $post->ID ) ) {
		return update_post_meta( $post->ID, '_wp_attachment_metadata', $data );
	} else {
		return delete_post_meta( $post->ID, '_wp_attachment_metadata' );
	}
}

/**
 * Retrieve the URL for an attachment.
 *
 * @since 2.1.0
 *
 * @global string $pagenow
 *
 * @param int $attachment_id Optional. Attachment post ID. Defaults to global $post.
 * @return string|false Attachment URL, otherwise false.
 */
function wp_get_attachment_url( $attachment_id = 0 ) {
	$attachment_id = (int) $attachment_id;
	if ( ! $post = get_post( $attachment_id ) ) {
		return false;
	}

	if ( 'attachment' != $post->post_type ) {
		return false;
	}

	$url = '';
	// Get attached file.
	if ( $file = get_post_meta( $post->ID, '_wp_attached_file', true ) ) {
		// Get upload directory.
		if ( ( $uploads = wp_get_upload_dir() ) && false === $uploads['error'] ) {
			// Check that the upload base exists in the file location.
			if ( 0 === strpos( $file, $uploads['basedir'] ) ) {
				// Replace file location with url location.
				$url = str_replace( $uploads['basedir'], $uploads['baseurl'], $file );
			} elseif ( false !== strpos( $file, 'wp-content/uploads' ) ) {
				// Get the directory name relative to the basedir (back compat for pre-2.7 uploads)
				$url = trailingslashit( $uploads['baseurl'] . '/' . _wp_get_attachment_relative_path( $file ) ) . wp_basename( $file );
			} else {
				// It's a newly-uploaded file, therefore $file is relative to the basedir.
				$url = $uploads['baseurl'] . "/$file";
			}
		}
	}

	/*
	 * If any of the above options failed, Fallback on the GUID as used pre-2.7,
	 * not recommended to rely upon this.
	 */
	if ( empty( $url ) ) {
		$url = get_the_guid( $post->ID );
	}

	// On SSL front end, URLs should be HTTPS.
	if ( is_ssl() && ! is_admin() && 'wp-login.php' !== $GLOBALS['pagenow'] ) {
		$url = set_url_scheme( $url );
	}

	/**
	 * Filters the attachment URL.
	 *
	 * @since 2.1.0
	 *
	 * @param string $url           URL for the given attachment.
	 * @param int    $attachment_id Attachment post ID.
	 */
	$url = apply_filters( 'wp_get_attachment_url', $url, $post->ID );

	if ( empty( $url ) ) {
		return false;
	}

	return $url;
}

/**
 * Retrieves the caption for an attachment.
 *
 * @since 4.6.0
 *
 * @param int $post_id Optional. Attachment ID. Default is the ID of the global `$post`.
 * @return string|false False on failure. Attachment caption on success.
 */
function wp_get_attachment_caption( $post_id = 0 ) {
	$post_id = (int) $post_id;
	if ( ! $post = get_post( $post_id ) ) {
		return false;
	}

	if ( 'attachment' !== $post->post_type ) {
		return false;
	}

	$caption = $post->post_excerpt;

	/**
	 * Filters the attachment caption.
	 *
	 * @since 4.6.0
	 *
	 * @param string $caption Caption for the given attachment.
	 * @param int    $post_id Attachment ID.
	 */
	return apply_filters( 'wp_get_attachment_caption', $caption, $post->ID );
}

/**
 * Retrieve thumbnail for an attachment.
 *
 * @since 2.1.0
 *
 * @param int $post_id Optional. Attachment ID. Default 0.
 * @return string|false False on failure. Thumbnail file path on success.
 */
function wp_get_attachment_thumb_file( $post_id = 0 ) {
	$post_id = (int) $post_id;
	if ( ! $post = get_post( $post_id ) ) {
		return false;
	}
	if ( ! is_array( $imagedata = wp_get_attachment_metadata( $post->ID ) ) ) {
		return false;
	}

	$file = get_attached_file( $post->ID );

	if ( ! empty( $imagedata['thumb'] ) && ( $thumbfile = str_replace( wp_basename( $file ), $imagedata['thumb'], $file ) ) && file_exists( $thumbfile ) ) {
		/**
		 * Filters the attachment thumbnail file path.
		 *
		 * @since 2.1.0
		 *
		 * @param string $thumbfile File path to the attachment thumbnail.
		 * @param int    $post_id   Attachment ID.
		 */
		return apply_filters( 'wp_get_attachment_thumb_file', $thumbfile, $post->ID );
	}
	return false;
}

/**
 * Retrieve URL for an attachment thumbnail.
 *
 * @since 2.1.0
 *
 * @param int $post_id Optional. Attachment ID. Default 0.
 * @return string|false False on failure. Thumbnail URL on success.
 */
function wp_get_attachment_thumb_url( $post_id = 0 ) {
	$post_id = (int) $post_id;
	if ( ! $post = get_post( $post_id ) ) {
		return false;
	}
	if ( ! $url = wp_get_attachment_url( $post->ID ) ) {
		return false;
	}

	$sized = image_downsize( $post_id, 'thumbnail' );
	if ( $sized ) {
		return $sized[0];
	}

	if ( ! $thumb = wp_get_attachment_thumb_file( $post->ID ) ) {
		return false;
	}

	$url = str_replace( wp_basename( $url ), wp_basename( $thumb ), $url );

	/**
	 * Filters the attachment thumbnail URL.
	 *
	 * @since 2.1.0
	 *
	 * @param string $url     URL for the attachment thumbnail.
	 * @param int    $post_id Attachment ID.
	 */
	return apply_filters( 'wp_get_attachment_thumb_url', $url, $post->ID );
}

/**
 * Verifies an attachment is of a given type.
 *
 * @since 4.2.0
 *
 * @param string      $type Attachment type. Accepts 'image', 'audio', or 'video'.
 * @param int|WP_Post $post Optional. Attachment ID or object. Default is global $post.
 * @return bool True if one of the accepted types, false otherwise.
 */
function wp_attachment_is( $type, $post = null ) {
	if ( ! $post = get_post( $post ) ) {
		return false;
	}

	if ( ! $file = get_attached_file( $post->ID ) ) {
		return false;
	}

	if ( 0 === strpos( $post->post_mime_type, $type . '/' ) ) {
		return true;
	}

	$check = wp_check_filetype( $file );
	if ( empty( $check['ext'] ) ) {
		return false;
	}

	$ext = $check['ext'];

	if ( 'import' !== $post->post_mime_type ) {
		return $type === $ext;
	}

	switch ( $type ) {
		case 'image':
			$image_exts = array( 'jpg', 'jpeg', 'jpe', 'gif', 'png' );
			return in_array( $ext, $image_exts );

		case 'audio':
			return in_array( $ext, wp_get_audio_extensions() );

		case 'video':
			return in_array( $ext, wp_get_video_extensions() );

		default:
			return $type === $ext;
	}
}

/**
 * Determines whether an attachment is an image.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 2.1.0
 * @since 4.2.0 Modified into wrapper for wp_attachment_is() and
 *              allowed WP_Post object to be passed.
 *
 * @param int|WP_Post $post Optional. Attachment ID or object. Default is global $post.
 * @return bool Whether the attachment is an image.
 */
function wp_attachment_is_image( $post = null ) {
	return wp_attachment_is( 'image', $post );
}

/**
 * Retrieve the icon for a MIME type.
 *
 * @since 2.1.0
 *
 * @param string|int $mime MIME type or attachment ID.
 * @return string|false Icon, false otherwise.
 */
function wp_mime_type_icon( $mime = 0 ) {
	if ( ! is_numeric( $mime ) ) {
		$icon = wp_cache_get( "mime_type_icon_$mime" );
	}

	$post_id = 0;
	if ( empty( $icon ) ) {
		$post_mimes = array();
		if ( is_numeric( $mime ) ) {
			$mime = (int) $mime;
			if ( $post = get_post( $mime ) ) {
				$post_id = (int) $post->ID;
				$file    = get_attached_file( $post_id );
				$ext     = preg_replace( '/^.+?\.([^.]+)$/', '$1', $file );
				if ( ! empty( $ext ) ) {
					$post_mimes[] = $ext;
					if ( $ext_type = wp_ext2type( $ext ) ) {
						$post_mimes[] = $ext_type;
					}
				}
				$mime = $post->post_mime_type;
			} else {
				$mime = 0;
			}
		} else {
			$post_mimes[] = $mime;
		}

		$icon_files = wp_cache_get( 'icon_files' );

		if ( ! is_array( $icon_files ) ) {
			/**
			 * Filters the icon directory path.
			 *
			 * @since 2.0.0
			 *
			 * @param string $path Icon directory absolute path.
			 */
			$icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/media' );

			/**
			 * Filters the icon directory URI.
			 *
			 * @since 2.0.0
			 *
			 * @param string $uri Icon directory URI.
			 */
			$icon_dir_uri = apply_filters( 'icon_dir_uri', includes_url( 'images/media' ) );

			/**
			 * Filters the list of icon directory URIs.
			 *
			 * @since 2.5.0
			 *
			 * @param array $uris List of icon directory URIs.
			 */
			$dirs       = apply_filters( 'icon_dirs', array( $icon_dir => $icon_dir_uri ) );
			$icon_files = array();
			while ( $dirs ) {
				$keys = array_keys( $dirs );
				$dir  = array_shift( $keys );
				$uri  = array_shift( $dirs );
				if ( $dh = opendir( $dir ) ) {
					while ( false !== $file = readdir( $dh ) ) {
						$file = wp_basename( $file );
						if ( substr( $file, 0, 1 ) == '.' ) {
							continue;
						}
						if ( ! in_array( strtolower( substr( $file, -4 ) ), array( '.png', '.gif', '.jpg' ) ) ) {
							if ( is_dir( "$dir/$file" ) ) {
								$dirs[ "$dir/$file" ] = "$uri/$file";
							}
							continue;
						}
						$icon_files[ "$dir/$file" ] = "$uri/$file";
					}
					closedir( $dh );
				}
			}
			wp_cache_add( 'icon_files', $icon_files, 'default', 600 );
		}

		$types = array();
		// Icon wp_basename - extension = MIME wildcard.
		foreach ( $icon_files as $file => $uri ) {
			$types[ preg_replace( '/^([^.]*).*$/', '$1', wp_basename( $file ) ) ] =& $icon_files[ $file ];
		}

		if ( ! empty( $mime ) ) {
			$post_mimes[] = substr( $mime, 0, strpos( $mime, '/' ) );
			$post_mimes[] = substr( $mime, strpos( $mime, '/' ) + 1 );
			$post_mimes[] = str_replace( '/', '_', $mime );
		}

		$matches            = wp_match_mime_types( array_keys( $types ), $post_mimes );
		$matches['default'] = array( 'default' );

		foreach ( $matches as $match => $wilds ) {
			foreach ( $wilds as $wild ) {
				if ( ! isset( $types[ $wild ] ) ) {
					continue;
				}

				$icon = $types[ $wild ];
				if ( ! is_numeric( $mime ) ) {
					wp_cache_add( "mime_type_icon_$mime", $icon );
				}
				break 2;
			}
		}
	}

	/**
	 * Filters the mime type icon.
	 *
	 * @since 2.1.0
	 *
	 * @param string $icon    Path to the mime type icon.
	 * @param string $mime    Mime type.
	 * @param int    $post_id Attachment ID. Will equal 0 if the function passed
	 *                        the mime type.
	 */
	return apply_filters( 'wp_mime_type_icon', $icon, $mime, $post_id );
}

/**
 * Check for changed slugs for published post objects and save the old slug.
 *
 * The function is used when a post object of any type is updated,
 * by comparing the current and previous post objects.
 *
 * If the slug was changed and not already part of the old slugs then it will be
 * added to the post meta field ('_wp_old_slug') for storing old slugs for that
 * post.
 *
 * The most logically usage of this function is redirecting changed post objects, so
 * that those that linked to an changed post will be redirected to the new post.
 *
 * @since 2.1.0
 *
 * @param int     $post_id     Post ID.
 * @param WP_Post $post        The Post Object
 * @param WP_Post $post_before The Previous Post Object
 */
function wp_check_for_changed_slugs( $post_id, $post, $post_before ) {
	// Don't bother if it hasn't changed.
	if ( $post->post_name == $post_before->post_name ) {
		return;
	}

	// We're only concerned with published, non-hierarchical objects.
	if ( ! ( 'publish' === $post->post_status || ( 'attachment' === get_post_type( $post ) && 'inherit' === $post->post_status ) ) || is_post_type_hierarchical( $post->post_type ) ) {
		return;
	}

	$old_slugs = (array) get_post_meta( $post_id, '_wp_old_slug' );

	// If we haven't added this old slug before, add it now.
	if ( ! empty( $post_before->post_name ) && ! in_array( $post_before->post_name, $old_slugs ) ) {
		add_post_meta( $post_id, '_wp_old_slug', $post_before->post_name );
	}

	// If the new slug was used previously, delete it from the list.
	if ( in_array( $post->post_name, $old_slugs ) ) {
		delete_post_meta( $post_id, '_wp_old_slug', $post->post_name );
	}
}

/**
 * Check for changed dates for published post objects and save the old date.
 *
 * The function is used when a post object of any type is updated,
 * by comparing the current and previous post objects.
 *
 * If the date was changed and not already part of the old dates then it will be
 * added to the post meta field ('_wp_old_date') for storing old dates for that
 * post.
 *
 * The most logically usage of this function is redirecting changed post objects, so
 * that those that linked to an changed post will be redirected to the new post.
 *
 * @since 4.9.3
 *
 * @param int     $post_id     Post ID.
 * @param WP_Post $post        The Post Object
 * @param WP_Post $post_before The Previous Post Object
 */
function wp_check_for_changed_dates( $post_id, $post, $post_before ) {
	$previous_date = date( 'Y-m-d', strtotime( $post_before->post_date ) );
	$new_date      = date( 'Y-m-d', strtotime( $post->post_date ) );
	// Don't bother if it hasn't changed.
	if ( $new_date == $previous_date ) {
		return;
	}
	// We're only concerned with published, non-hierarchical objects.
	if ( ! ( 'publish' === $post->post_status || ( 'attachment' === get_post_type( $post ) && 'inherit' === $post->post_status ) ) || is_post_type_hierarchical( $post->post_type ) ) {
		return;
	}
	$old_dates = (array) get_post_meta( $post_id, '_wp_old_date' );
	// If we haven't added this old date before, add it now.
	if ( ! empty( $previous_date ) && ! in_array( $previous_date, $old_dates ) ) {
		add_post_meta( $post_id, '_wp_old_date', $previous_date );
	}
	// If the new slug was used previously, delete it from the list.
	if ( in_array( $new_date, $old_dates ) ) {
		delete_post_meta( $post_id, '_wp_old_date', $new_date );
	}
}

/**
 * Retrieve the private post SQL based on capability.
 *
 * This function provides a standardized way to appropriately select on the
 * post_status of a post type. The function will return a piece of SQL code
 * that can be added to a WHERE clause; this SQL is constructed to allow all
 * published posts, and all private posts to which the user has access.
 *
 * @since 2.2.0
 * @since 4.3.0 Added the ability to pass an array to `$post_type`.
 *
 * @param string|array $post_type Single post type or an array of post types. Currently only supports 'post' or 'page'.
 * @return string SQL code that can be added to a where clause.
 */
function get_private_posts_cap_sql( $post_type ) {
	return get_posts_by_author_sql( $post_type, false );
}

/**
 * Retrieve the post SQL based on capability, author, and type.
 *
 * @since 3.0.0
 * @since 4.3.0 Introduced the ability to pass an array of post types to `$post_type`.
 *
 * @see get_private_posts_cap_sql()
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param array|string   $post_type   Single post type or an array of post types.
 * @param bool           $full        Optional. Returns a full WHERE statement instead of just
 *                                    an 'andalso' term. Default true.
 * @param int            $post_author Optional. Query posts having a single author ID. Default null.
 * @param bool           $public_only Optional. Only return public posts. Skips cap checks for
 *                                    $current_user.  Default false.
 * @return string SQL WHERE code that can be added to a query.
 */
function get_posts_by_author_sql( $post_type, $full = true, $post_author = null, $public_only = false ) {
	global $wpdb;

	if ( is_array( $post_type ) ) {
		$post_types = $post_type;
	} else {
		$post_types = array( $post_type );
	}

	$post_type_clauses = array();
	foreach ( $post_types as $post_type ) {
		$post_type_obj = get_post_type_object( $post_type );
		if ( ! $post_type_obj ) {
			continue;
		}

		/**
		 * Filters the capability to read private posts for a custom post type
		 * when generating SQL for getting posts by author.
		 *
		 * @since 2.2.0
		 * @deprecated 3.2.0 The hook transitioned from "somewhat useless" to "totally useless".
		 *
		 * @param string $cap Capability.
		 */
		if ( ! $cap = apply_filters( 'pub_priv_sql_capability', '' ) ) {
			$cap = current_user_can( $post_type_obj->cap->read_private_posts );
		}

		// Only need to check the cap if $public_only is false.
		$post_status_sql = "post_status = 'publish'";
		if ( false === $public_only ) {
			if ( $cap ) {
				// Does the user have the capability to view private posts? Guess so.
				$post_status_sql .= " OR post_status = 'private'";
			} elseif ( is_user_logged_in() ) {
				// Users can view their own private posts.
				$id = get_current_user_id();
				if ( null === $post_author || ! $full ) {
					$post_status_sql .= " OR post_status = 'private' AND post_author = $id";
				} elseif ( $id == (int) $post_author ) {
					$post_status_sql .= " OR post_status = 'private'";
				} // else none
			} // else none
		}

		$post_type_clauses[] = "( post_type = '" . $post_type . "' AND ( $post_status_sql ) )";
	}

	if ( empty( $post_type_clauses ) ) {
		return $full ? 'WHERE 1 = 0' : '1 = 0';
	}

	$sql = '( ' . implode( ' OR ', $post_type_clauses ) . ' )';

	if ( null !== $post_author ) {
		$sql .= $wpdb->prepare( ' AND post_author = %d', $post_author );
	}

	if ( $full ) {
		$sql = 'WHERE ' . $sql;
	}

	return $sql;
}

/**
 * Retrieve the date that the last post was published.
 *
 * The server timezone is the default and is the difference between GMT and
 * server time. The 'blog' value is the date when the last post was posted. The
 * 'gmt' is when the last post was posted in GMT formatted date.
 *
 * @since 0.71
 * @since 4.4.0 The `$post_type` argument was added.
 *
 * @param string $timezone  Optional. The timezone for the timestamp. Accepts 'server', 'blog', or 'gmt'.
 *                          'server' uses the server's internal timezone.
 *                          'blog' uses the `post_modified` field, which proxies to the timezone set for the site.
 *                          'gmt' uses the `post_modified_gmt` field.
 *                          Default 'server'.
 * @param string $post_type Optional. The post type to check. Default 'any'.
 * @return string The date of the last post.
 */
function get_lastpostdate( $timezone = 'server', $post_type = 'any' ) {
	/**
	 * Filters the date the last post was published.
	 *
	 * @since 2.3.0
	 *
	 * @param string $date     Date the last post was published.
	 * @param string $timezone Location to use for getting the post published date.
	 *                         See get_lastpostdate() for accepted `$timezone` values.
	 */
	return apply_filters( 'get_lastpostdate', _get_last_post_time( $timezone, 'date', $post_type ), $timezone );
}

/**
 * Get the timestamp of the last time any post was modified.
 *
 * The server timezone is the default and is the difference between GMT and
 * server time. The 'blog' value is just when the last post was modified. The
 * 'gmt' is when the last post was modified in GMT time.
 *
 * @since 1.2.0
 * @since 4.4.0 The `$post_type` argument was added.
 *
 * @param string $timezone  Optional. The timezone for the timestamp. See get_lastpostdate()
 *                          for information on accepted values.
 *                          Default 'server'.
 * @param string $post_type Optional. The post type to check. Default 'any'.
 * @return string The timestamp.
 */
function get_lastpostmodified( $timezone = 'server', $post_type = 'any' ) {
	/**
	 * Pre-filter the return value of get_lastpostmodified() before the query is run.
	 *
	 * @since 4.4.0
	 *
	 * @param string $lastpostmodified Date the last post was modified.
	 *                                 Returning anything other than false will short-circuit the function.
	 * @param string $timezone         Location to use for getting the post modified date.
	 *                                 See get_lastpostdate() for accepted `$timezone` values.
	 * @param string $post_type        The post type to check.
	 */
	$lastpostmodified = apply_filters( 'pre_get_lastpostmodified', false, $timezone, $post_type );
	if ( false !== $lastpostmodified ) {
		return $lastpostmodified;
	}

	$lastpostmodified = _get_last_post_time( $timezone, 'modified', $post_type );

	$lastpostdate = get_lastpostdate( $timezone );
	if ( $lastpostdate > $lastpostmodified ) {
		$lastpostmodified = $lastpostdate;
	}

	/**
	 * Filters the date the last post was modified.
	 *
	 * @since 2.3.0
	 *
	 * @param string $lastpostmodified Date the last post was modified.
	 * @param string $timezone         Location to use for getting the post modified date.
	 *                                 See get_lastpostdate() for accepted `$timezone` values.
	 */
	return apply_filters( 'get_lastpostmodified', $lastpostmodified, $timezone );
}

/**
 * Get the timestamp of the last time any post was modified or published.
 *
 * @since 3.1.0
 * @since 4.4.0 The `$post_type` argument was added.
 * @access private
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $timezone  The timezone for the timestamp. See get_lastpostdate().
 *                          for information on accepted values.
 * @param string $field     Post field to check. Accepts 'date' or 'modified'.
 * @param string $post_type Optional. The post type to check. Default 'any'.
 * @return string|false The timestamp.
 */
function _get_last_post_time( $timezone, $field, $post_type = 'any' ) {
	global $wpdb;

	if ( ! in_array( $field, array( 'date', 'modified' ) ) ) {
		return false;
	}

	$timezone = strtolower( $timezone );

	$key = "lastpost{$field}:$timezone";
	if ( 'any' !== $post_type ) {
		$key .= ':' . sanitize_key( $post_type );
	}

	$date = wp_cache_get( $key, 'timeinfo' );
	if ( false !== $date ) {
		return $date;
	}

	if ( 'any' === $post_type ) {
		$post_types = get_post_types( array( 'public' => true ) );
		array_walk( $post_types, array( $wpdb, 'escape_by_ref' ) );
		$post_types = "'" . implode( "', '", $post_types ) . "'";
	} else {
		$post_types = "'" . sanitize_key( $post_type ) . "'";
	}

	switch ( $timezone ) {
		case 'gmt':
			$date = $wpdb->get_var( "SELECT post_{$field}_gmt FROM $wpdb->posts WHERE post_status = 'publish' AND post_type IN ({$post_types}) ORDER BY post_{$field}_gmt DESC LIMIT 1" );
			break;
		case 'blog':
			$date = $wpdb->get_var( "SELECT post_{$field} FROM $wpdb->posts WHERE post_status = 'publish' AND post_type IN ({$post_types}) ORDER BY post_{$field}_gmt DESC LIMIT 1" );
			break;
		case 'server':
			$add_seconds_server = date( 'Z' );
			$date               = $wpdb->get_var( "SELECT DATE_ADD(post_{$field}_gmt, INTERVAL '$add_seconds_server' SECOND) FROM $wpdb->posts WHERE post_status = 'publish' AND post_type IN ({$post_types}) ORDER BY post_{$field}_gmt DESC LIMIT 1" );
			break;
	}

	if ( $date ) {
		wp_cache_set( $key, $date, 'timeinfo' );

		return $date;
	}

	return false;
}

/**
 * Updates posts in cache.
 *
 * @since 1.5.1
 *
 * @param array $posts Array of post objects (passed by reference).
 */
function update_post_cache( &$posts ) {
	if ( ! $posts ) {
		return;
	}

	foreach ( $posts as $post ) {
		wp_cache_add( $post->ID, $post, 'posts' );
	}
}

/**
 * Will clean the post in the cache.
 *
 * Cleaning means delete from the cache of the post. Will call to clean the term
 * object cache associated with the post ID.
 *
 * This function not run if $_wp_suspend_cache_invalidation is not empty. See
 * wp_suspend_cache_invalidation().
 *
 * @since 2.0.0
 *
 * @global bool $_wp_suspend_cache_invalidation
 *
 * @param int|WP_Post $post Post ID or post object to remove from the cache.
 */
function clean_post_cache( $post ) {
	global $_wp_suspend_cache_invalidation;

	if ( ! empty( $_wp_suspend_cache_invalidation ) ) {
		return;
	}

	$post = get_post( $post );
	if ( empty( $post ) ) {
		return;
	}

	wp_cache_delete( $post->ID, 'posts' );
	wp_cache_delete( $post->ID, 'post_meta' );

	clean_object_term_cache( $post->ID, $post->post_type );

	wp_cache_delete( 'wp_get_archives', 'general' );

	/**
	 * Fires immediately after the given post's cache is cleaned.
	 *
	 * @since 2.5.0
	 *
	 * @param int     $post_id Post ID.
	 * @param WP_Post $post    Post object.
	 */
	do_action( 'clean_post_cache', $post->ID, $post );

	if ( 'page' == $post->post_type ) {
		wp_cache_delete( 'all_page_ids', 'posts' );

		/**
		 * Fires immediately after the given page's cache is cleaned.
		 *
		 * @since 2.5.0
		 *
		 * @param int $post_id Post ID.
		 */
		do_action( 'clean_page_cache', $post->ID );
	}

	wp_cache_set( 'last_changed', microtime(), 'posts' );
}

/**
 * Call major cache updating functions for list of Post objects.
 *
 * @since 1.5.0
 *
 * @param array  $posts             Array of Post objects
 * @param string $post_type         Optional. Post type. Default 'post'.
 * @param bool   $update_term_cache Optional. Whether to update the term cache. Default true.
 * @param bool   $update_meta_cache Optional. Whether to update the meta cache. Default true.
 */
function update_post_caches( &$posts, $post_type = 'post', $update_term_cache = true, $update_meta_cache = true ) {
	// No point in doing all this work if we didn't match any posts.
	if ( ! $posts ) {
		return;
	}

	update_post_cache( $posts );

	$post_ids = array();
	foreach ( $posts as $post ) {
		$post_ids[] = $post->ID;
	}

	if ( ! $post_type ) {
		$post_type = 'any';
	}

	if ( $update_term_cache ) {
		if ( is_array( $post_type ) ) {
			$ptypes = $post_type;
		} elseif ( 'any' == $post_type ) {
			$ptypes = array();
			// Just use the post_types in the supplied posts.
			foreach ( $posts as $post ) {
				$ptypes[] = $post->post_type;
			}
			$ptypes = array_unique( $ptypes );
		} else {
			$ptypes = array( $post_type );
		}

		if ( ! empty( $ptypes ) ) {
			update_object_term_cache( $post_ids, $ptypes );
		}
	}

	if ( $update_meta_cache ) {
		update_postmeta_cache( $post_ids );
	}
}

/**
 * Updates metadata cache for list of post IDs.
 *
 * Performs SQL query to retrieve the metadata for the post IDs and updates the
 * metadata cache for the posts. Therefore, the functions, which call this
 * function, do not need to perform SQL queries on their own.
 *
 * @since 2.1.0
 *
 * @param array $post_ids List of post IDs.
 * @return array|false Returns false if there is nothing to update or an array
 *                     of metadata.
 */
function update_postmeta_cache( $post_ids ) {
	return update_meta_cache( 'post', $post_ids );
}

/**
 * Will clean the attachment in the cache.
 *
 * Cleaning means delete from the cache. Optionally will clean the term
 * object cache associated with the attachment ID.
 *
 * This function will not run if $_wp_suspend_cache_invalidation is not empty.
 *
 * @since 3.0.0
 *
 * @global bool $_wp_suspend_cache_invalidation
 *
 * @param int  $id          The attachment ID in the cache to clean.
 * @param bool $clean_terms Optional. Whether to clean terms cache. Default false.
 */
function clean_attachment_cache( $id, $clean_terms = false ) {
	global $_wp_suspend_cache_invalidation;

	if ( ! empty( $_wp_suspend_cache_invalidation ) ) {
		return;
	}

	$id = (int) $id;

	wp_cache_delete( $id, 'posts' );
	wp_cache_delete( $id, 'post_meta' );

	if ( $clean_terms ) {
		clean_object_term_cache( $id, 'attachment' );
	}

	/**
	 * Fires after the given attachment's cache is cleaned.
	 *
	 * @since 3.0.0
	 *
	 * @param int $id Attachment ID.
	 */
	do_action( 'clean_attachment_cache', $id );
}

//
// Hooks
//

/**
 * Hook for managing future post transitions to published.
 *
 * @since 2.3.0
 * @access private
 *
 * @see wp_clear_scheduled_hook()
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string  $new_status New post status.
 * @param string  $old_status Previous post status.
 * @param WP_Post $post       Post object.
 */
function _transition_post_status( $new_status, $old_status, $post ) {
	global $wpdb;

	if ( $old_status != 'publish' && $new_status == 'publish' ) {
		// Reset GUID if transitioning to publish and it is empty.
		if ( '' == get_the_guid( $post->ID ) ) {
			$wpdb->update( $wpdb->posts, array( 'guid' => get_permalink( $post->ID ) ), array( 'ID' => $post->ID ) );
		}

		/**
		 * Fires when a post's status is transitioned from private to published.
		 *
		 * @since 1.5.0
		 * @deprecated 2.3.0 Use 'private_to_publish' instead.
		 *
		 * @param int $post_id Post ID.
		 */
		do_action( 'private_to_published', $post->ID );
	}

	// If published posts changed clear the lastpostmodified cache.
	if ( 'publish' == $new_status || 'publish' == $old_status ) {
		foreach ( array( 'server', 'gmt', 'blog' ) as $timezone ) {
			wp_cache_delete( "lastpostmodified:$timezone", 'timeinfo' );
			wp_cache_delete( "lastpostdate:$timezone", 'timeinfo' );
			wp_cache_delete( "lastpostdate:$timezone:{$post->post_type}", 'timeinfo' );
		}
	}

	if ( $new_status !== $old_status ) {
		wp_cache_delete( _count_posts_cache_key( $post->post_type ), 'counts' );
		wp_cache_delete( _count_posts_cache_key( $post->post_type, 'readable' ), 'counts' );
	}

	// Always clears the hook in case the post status bounced from future to draft.
	wp_clear_scheduled_hook( 'publish_future_post', array( $post->ID ) );
}

/**
 * Hook used to schedule publication for a post marked for the future.
 *
 * The $post properties used and must exist are 'ID' and 'post_date_gmt'.
 *
 * @since 2.3.0
 * @access private
 *
 * @param int     $deprecated Not used. Can be set to null. Never implemented. Not marked
 *                            as deprecated with _deprecated_argument() as it conflicts with
 *                            wp_transition_post_status() and the default filter for _future_post_hook().
 * @param WP_Post $post       Post object.
 */
function _future_post_hook( $deprecated, $post ) {
	wp_clear_scheduled_hook( 'publish_future_post', array( $post->ID ) );
	wp_schedule_single_event( strtotime( get_gmt_from_date( $post->post_date ) . ' GMT' ), 'publish_future_post', array( $post->ID ) );
}

/**
 * Hook to schedule pings and enclosures when a post is published.
 *
 * Uses XMLRPC_REQUEST and WP_IMPORTING constants.
 *
 * @since 2.3.0
 * @access private
 *
 * @param int $post_id The ID in the database table of the post being published.
 */
function _publish_post_hook( $post_id ) {
	if ( defined( 'XMLRPC_REQUEST' ) ) {
		/**
		 * Fires when _publish_post_hook() is called during an XML-RPC request.
		 *
		 * @since 2.1.0
		 *
		 * @param int $post_id Post ID.
		 */
		do_action( 'xmlrpc_publish_post', $post_id );
	}

	if ( defined( 'WP_IMPORTING' ) ) {
		return;
	}

	if ( get_option( 'default_pingback_flag' ) ) {
		add_post_meta( $post_id, '_pingme', '1' );
	}
	add_post_meta( $post_id, '_encloseme', '1' );

	if ( ! wp_next_scheduled( 'do_pings' ) ) {
		wp_schedule_single_event( time(), 'do_pings' );
	}
}

/**
 * Returns the ID of the post's parent.
 *
 * @since 3.1.0
 *
 * @param int|WP_Post $post Post ID or post object. Defaults to global $post.
 * @return int|false Post parent ID (which can be 0 if there is no parent), or false if the post does not exist.
 */
function wp_get_post_parent_id( $post ) {
	$post = get_post( $post );
	if ( ! $post || is_wp_error( $post ) ) {
		return false;
	}
	return (int) $post->post_parent;
}

/**
 * Check the given subset of the post hierarchy for hierarchy loops.
 *
 * Prevents loops from forming and breaks those that it finds. Attached
 * to the {@see 'wp_insert_post_parent'} filter.
 *
 * @since 3.1.0
 *
 * @see wp_find_hierarchy_loop()
 *
 * @param int $post_parent ID of the parent for the post we're checking.
 * @param int $post_ID     ID of the post we're checking.
 * @return int The new post_parent for the post, 0 otherwise.
 */
function wp_check_post_hierarchy_for_loops( $post_parent, $post_ID ) {
	// Nothing fancy here - bail.
	if ( ! $post_parent ) {
		return 0;
	}

	// New post can't cause a loop.
	if ( empty( $post_ID ) ) {
		return $post_parent;
	}

	// Can't be its own parent.
	if ( $post_parent == $post_ID ) {
		return 0;
	}

	// Now look for larger loops.
	if ( ! $loop = wp_find_hierarchy_loop( 'wp_get_post_parent_id', $post_ID, $post_parent ) ) {
		return $post_parent; // No loop
	}

	// Setting $post_parent to the given value causes a loop.
	if ( isset( $loop[ $post_ID ] ) ) {
		return 0;
	}

	// There's a loop, but it doesn't contain $post_ID. Break the loop.
	foreach ( array_keys( $loop ) as $loop_member ) {
		wp_update_post(
			array(
				'ID'          => $loop_member,
				'post_parent' => 0,
			)
		);
	}

	return $post_parent;
}

/**
 * Sets the post thumbnail (featured image) for the given post.
 *
 * @since 3.1.0
 *
 * @param int|WP_Post $post         Post ID or post object where thumbnail should be attached.
 * @param int         $thumbnail_id Thumbnail to attach.
 * @return int|bool True on success, false on failure.
 */
function set_post_thumbnail( $post, $thumbnail_id ) {
	$post         = get_post( $post );
	$thumbnail_id = absint( $thumbnail_id );
	if ( $post && $thumbnail_id && get_post( $thumbnail_id ) ) {
		if ( wp_get_attachment_image( $thumbnail_id, 'thumbnail' ) ) {
			return update_post_meta( $post->ID, '_thumbnail_id', $thumbnail_id );
		} else {
			return delete_post_meta( $post->ID, '_thumbnail_id' );
		}
	}
	return false;
}

/**
 * Removes the thumbnail (featured image) from the given post.
 *
 * @since 3.3.0
 *
 * @param int|WP_Post $post Post ID or post object from which the thumbnail should be removed.
 * @return bool True on success, false on failure.
 */
function delete_post_thumbnail( $post ) {
	$post = get_post( $post );
	if ( $post ) {
		return delete_post_meta( $post->ID, '_thumbnail_id' );
	}
	return false;
}

/**
 * Delete auto-drafts for new posts that are > 7 days old.
 *
 * @since 3.4.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 */
function wp_delete_auto_drafts() {
	global $wpdb;

	// Cleanup old auto-drafts more than 7 days old.
	$old_posts = $wpdb->get_col( "SELECT ID FROM $wpdb->posts WHERE post_status = 'auto-draft' AND DATE_SUB( NOW(), INTERVAL 7 DAY ) > post_date" );
	foreach ( (array) $old_posts as $delete ) {
		// Force delete.
		wp_delete_post( $delete, true );
	}
}

/**
 * Queues posts for lazy-loading of term meta.
 *
 * @since 4.5.0
 *
 * @param array $posts Array of WP_Post objects.
 */
function wp_queue_posts_for_term_meta_lazyload( $posts ) {
	$post_type_taxonomies = $term_ids = array();
	foreach ( $posts as $post ) {
		if ( ! ( $post instanceof WP_Post ) ) {
			continue;
		}

		if ( ! isset( $post_type_taxonomies[ $post->post_type ] ) ) {
			$post_type_taxonomies[ $post->post_type ] = get_object_taxonomies( $post->post_type );
		}

		foreach ( $post_type_taxonomies[ $post->post_type ] as $taxonomy ) {
			// Term cache should already be primed by `update_post_term_cache()`.
			$terms = get_object_term_cache( $post->ID, $taxonomy );
			if ( false !== $terms ) {
				foreach ( $terms as $term ) {
					if ( ! isset( $term_ids[ $term->term_id ] ) ) {
						$term_ids[] = $term->term_id;
					}
				}
			}
		}
	}

	if ( $term_ids ) {
		$lazyloader = wp_metadata_lazyloader();
		$lazyloader->queue_objects( 'term', $term_ids );
	}
}

/**
 * Update the custom taxonomies' term counts when a post's status is changed.
 *
 * For example, default posts term counts (for custom taxonomies) don't include
 * private / draft posts.
 *
 * @since 3.3.0
 * @access private
 *
 * @param string  $new_status New post status.
 * @param string  $old_status Old post status.
 * @param WP_Post $post       Post object.
 */
function _update_term_count_on_transition_post_status( $new_status, $old_status, $post ) {
	// Update counts for the post's terms.
	foreach ( (array) get_object_taxonomies( $post->post_type ) as $taxonomy ) {
		$tt_ids = wp_get_object_terms( $post->ID, $taxonomy, array( 'fields' => 'tt_ids' ) );
		wp_update_term_count( $tt_ids, $taxonomy );
	}
}

/**
 * Adds any posts from the given ids to the cache that do not already exist in cache
 *
 * @since 3.4.0
 * @access private
 *
 * @see update_post_caches()
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param array $ids               ID list.
 * @param bool  $update_term_cache Optional. Whether to update the term cache. Default true.
 * @param bool  $update_meta_cache Optional. Whether to update the meta cache. Default true.
 */
function _prime_post_caches( $ids, $update_term_cache = true, $update_meta_cache = true ) {
	global $wpdb;

	$non_cached_ids = _get_non_cached_ids( $ids, 'posts' );
	if ( ! empty( $non_cached_ids ) ) {
		$fresh_posts = $wpdb->get_results( sprintf( "SELECT $wpdb->posts.* FROM $wpdb->posts WHERE ID IN (%s)", join( ',', $non_cached_ids ) ) );

		update_post_caches( $fresh_posts, 'any', $update_term_cache, $update_meta_cache );
	}
}

/**
 * Adds a suffix if any trashed posts have a given slug.
 *
 * Store its desired (i.e. current) slug so it can try to reclaim it
 * if the post is untrashed.
 *
 * For internal use.
 *
 * @since 4.5.0
 * @access private
 *
 * @param string $post_name Slug.
 * @param string $post_ID   Optional. Post ID that should be ignored. Default 0.
 */
function wp_add_trashed_suffix_to_post_name_for_trashed_posts( $post_name, $post_ID = 0 ) {
	$trashed_posts_with_desired_slug = get_posts(
		array(
			'name'         => $post_name,
			'post_status'  => 'trash',
			'post_type'    => 'any',
			'nopaging'     => true,
			'post__not_in' => array( $post_ID ),
		)
	);

	if ( ! empty( $trashed_posts_with_desired_slug ) ) {
		foreach ( $trashed_posts_with_desired_slug as $_post ) {
			wp_add_trashed_suffix_to_post_name_for_post( $_post );
		}
	}
}

/**
 * Adds a trashed suffix for a given post.
 *
 * Store its desired (i.e. current) slug so it can try to reclaim it
 * if the post is untrashed.
 *
 * For internal use.
 *
 * @since 4.5.0
 * @access private
 *
 * @param WP_Post $post The post.
 * @return string New slug for the post.
 */
function wp_add_trashed_suffix_to_post_name_for_post( $post ) {
	global $wpdb;

	$post = get_post( $post );

	if ( '__trashed' === substr( $post->post_name, -9 ) ) {
		return $post->post_name;
	}
	add_post_meta( $post->ID, '_wp_desired_post_slug', $post->post_name );
	$post_name = _truncate_post_slug( $post->post_name, 191 ) . '__trashed';
	$wpdb->update( $wpdb->posts, array( 'post_name' => $post_name ), array( 'ID' => $post->ID ) );
	clean_post_cache( $post->ID );
	return $post_name;
}

/**
 * Sets the last changed time for the 'posts' cache group.
 *
 * @since 5.0.0
 */
function wp_cache_set_posts_last_changed() {
	wp_cache_set( 'last_changed', microtime(), 'posts' );
}

/**
 * Get all available post MIME types for a given post type.
 *
 * @since 2.5.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $type
 * @return mixed
 */
function get_available_post_mime_types( $type = 'attachment' ) {
	global $wpdb;

	$types = $wpdb->get_col( $wpdb->prepare( "SELECT DISTINCT post_mime_type FROM $wpdb->posts WHERE post_type = %s", $type ) );
	return $types;
}
home/xbodynamge/lebauwcentre/wp-admin/post.php000060400000022563151130635410015526 0ustar00<?php
/**
 * Edit post administration panel.
 *
 * Manage Post actions: post, edit, delete, etc.
 *
 * @package WordPress
 * @subpackage Administration
 */

/** WordPress Administration Bootstrap */
require_once( dirname( __FILE__ ) . '/admin.php' );

$parent_file  = 'edit.php';
$submenu_file = 'edit.php';

wp_reset_vars( array( 'action' ) );

if ( isset( $_GET['post'] ) && isset( $_POST['post_ID'] ) && (int) $_GET['post'] !== (int) $_POST['post_ID'] ) {
	wp_die( __( 'A post ID mismatch has been detected.' ), __( 'Sorry, you are not allowed to edit this item.' ), 400 );
} elseif ( isset( $_GET['post'] ) ) {
	$post_id = $post_ID = (int) $_GET['post'];
} elseif ( isset( $_POST['post_ID'] ) ) {
	$post_id = $post_ID = (int) $_POST['post_ID'];
} else {
	$post_id = $post_ID = 0;
}

/**
 * @global string  $post_type
 * @global object  $post_type_object
 * @global WP_Post $post
 */
global $post_type, $post_type_object, $post;

if ( $post_id ) {
	$post = get_post( $post_id );
}

if ( $post ) {
	$post_type        = $post->post_type;
	$post_type_object = get_post_type_object( $post_type );
}

if ( isset( $_POST['post_type'] ) && $post && $post_type !== $_POST['post_type'] ) {
	wp_die( __( 'A post type mismatch has been detected.' ), __( 'Sorry, you are not allowed to edit this item.' ), 400 );
}

if ( isset( $_POST['deletepost'] ) ) {
	$action = 'delete';
} elseif ( isset( $_POST['wp-preview'] ) && 'dopreview' == $_POST['wp-preview'] ) {
	$action = 'preview';
}

$sendback = wp_get_referer();
if ( ! $sendback ||
	 strpos( $sendback, 'post.php' ) !== false ||
	 strpos( $sendback, 'post-new.php' ) !== false ) {
	if ( 'attachment' == $post_type ) {
		$sendback = admin_url( 'upload.php' );
	} else {
		$sendback = admin_url( 'edit.php' );
		if ( ! empty( $post_type ) ) {
			$sendback = add_query_arg( 'post_type', $post_type, $sendback );
		}
	}
} else {
	$sendback = remove_query_arg( array( 'trashed', 'untrashed', 'deleted', 'ids' ), $sendback );
}

switch ( $action ) {
	case 'post-quickdraft-save':
		// Check nonce and capabilities
		$nonce     = $_REQUEST['_wpnonce'];
		$error_msg = false;

		// For output of the quickdraft dashboard widget
		require_once ABSPATH . 'wp-admin/includes/dashboard.php';

		if ( ! wp_verify_nonce( $nonce, 'add-post' ) ) {
			$error_msg = __( 'Unable to submit this form, please refresh and try again.' );
		}

		if ( ! current_user_can( get_post_type_object( 'post' )->cap->create_posts ) ) {
			exit;
		}

		if ( $error_msg ) {
			return wp_dashboard_quick_press( $error_msg );
		}

		$post = get_post( $_REQUEST['post_ID'] );
		check_admin_referer( 'add-' . $post->post_type );

		$_POST['comment_status'] = get_default_comment_status( $post->post_type );
		$_POST['ping_status']    = get_default_comment_status( $post->post_type, 'pingback' );

		edit_post();
		wp_dashboard_quick_press();
		exit;

	case 'postajaxpost':
	case 'post':
		check_admin_referer( 'add-' . $post_type );
		$post_id = 'postajaxpost' == $action ? edit_post() : write_post();
		redirect_post( $post_id );
		exit();

	case 'edit':
		$editing = true;

		if ( empty( $post_id ) ) {
			wp_redirect( admin_url( 'post.php' ) );
			exit();
		}

		if ( ! $post ) {
			wp_die( __( 'You attempted to edit an item that doesn&#8217;t exist. Perhaps it was deleted?' ) );
		}

		if ( ! $post_type_object ) {
			wp_die( __( 'Invalid post type.' ) );
		}

		if ( ! in_array( $typenow, get_post_types( array( 'show_ui' => true ) ) ) ) {
			wp_die( __( 'Sorry, you are not allowed to edit posts in this post type.' ) );
		}

		if ( ! current_user_can( 'edit_post', $post_id ) ) {
			wp_die( __( 'Sorry, you are not allowed to edit this item.' ) );
		}

		if ( 'trash' == $post->post_status ) {
			wp_die( __( 'You can&#8217;t edit this item because it is in the Trash. Please restore it and try again.' ) );
		}

		if ( ! empty( $_GET['get-post-lock'] ) ) {
			check_admin_referer( 'lock-post_' . $post_id );
			wp_set_post_lock( $post_id );
			wp_redirect( get_edit_post_link( $post_id, 'url' ) );
			exit();
		}

		$post_type = $post->post_type;
		if ( 'post' == $post_type ) {
			$parent_file   = 'edit.php';
			$submenu_file  = 'edit.php';
			$post_new_file = 'post-new.php';
		} elseif ( 'attachment' == $post_type ) {
			$parent_file   = 'upload.php';
			$submenu_file  = 'upload.php';
			$post_new_file = 'media-new.php';
		} else {
			if ( isset( $post_type_object ) && $post_type_object->show_in_menu && $post_type_object->show_in_menu !== true ) {
				$parent_file = $post_type_object->show_in_menu;
			} else {
				$parent_file = "edit.php?post_type=$post_type";
			}
			$submenu_file  = "edit.php?post_type=$post_type";
			$post_new_file = "post-new.php?post_type=$post_type";
		}

		$title = $post_type_object->labels->edit_item;

		/**
		 * Allows replacement of the editor.
		 *
		 * @since 4.9.0
		 *
		 * @param boolean      Whether to replace the editor. Default false.
		 * @param object $post Post object.
		 */
		if ( apply_filters( 'replace_editor', false, $post ) === true ) {
			break;
		}

		if ( use_block_editor_for_post( $post ) ) {
			include( ABSPATH . 'wp-admin/edit-form-blocks.php' );
			break;
		}

		if ( ! wp_check_post_lock( $post->ID ) ) {
			$active_post_lock = wp_set_post_lock( $post->ID );

			if ( 'attachment' !== $post_type ) {
				wp_enqueue_script( 'autosave' );
			}
		}

		$post = get_post( $post_id, OBJECT, 'edit' );

		if ( post_type_supports( $post_type, 'comments' ) ) {
			wp_enqueue_script( 'admin-comments' );
			enqueue_comment_hotkeys_js();
		}

		include( ABSPATH . 'wp-admin/edit-form-advanced.php' );

		break;

	case 'editattachment':
		check_admin_referer( 'update-post_' . $post_id );

		// Don't let these be changed
		unset( $_POST['guid'] );
		$_POST['post_type'] = 'attachment';

		// Update the thumbnail filename
		$newmeta          = wp_get_attachment_metadata( $post_id, true );
		$newmeta['thumb'] = wp_basename( $_POST['thumb'] );

		wp_update_attachment_metadata( $post_id, $newmeta );

		// Intentional fall-through to trigger the edit_post() call.
	case 'editpost':
		check_admin_referer( 'update-post_' . $post_id );

		$post_id = edit_post();

		// Session cookie flag that the post was saved
		if ( isset( $_COOKIE['wp-saving-post'] ) && $_COOKIE['wp-saving-post'] === $post_id . '-check' ) {
			setcookie( 'wp-saving-post', $post_id . '-saved', time() + DAY_IN_SECONDS, ADMIN_COOKIE_PATH, COOKIE_DOMAIN, is_ssl() );
		}

		redirect_post( $post_id ); // Send user on their way while we keep working

		exit();

	case 'trash':
		check_admin_referer( 'trash-post_' . $post_id );

		if ( ! $post ) {
			wp_die( __( 'The item you are trying to move to the Trash no longer exists.' ) );
		}

		if ( ! $post_type_object ) {
			wp_die( __( 'Invalid post type.' ) );
		}

		if ( ! current_user_can( 'delete_post', $post_id ) ) {
			wp_die( __( 'Sorry, you are not allowed to move this item to the Trash.' ) );
		}

		if ( $user_id = wp_check_post_lock( $post_id ) ) {
			$user = get_userdata( $user_id );
			wp_die( sprintf( __( 'You cannot move this item to the Trash. %s is currently editing.' ), $user->display_name ) );
		}

		if ( ! wp_trash_post( $post_id ) ) {
			wp_die( __( 'Error in moving to Trash.' ) );
		}

		wp_redirect(
			add_query_arg(
				array(
					'trashed' => 1,
					'ids'     => $post_id,
				),
				$sendback
			)
		);
		exit();

	case 'untrash':
		check_admin_referer( 'untrash-post_' . $post_id );

		if ( ! $post ) {
			wp_die( __( 'The item you are trying to restore from the Trash no longer exists.' ) );
		}

		if ( ! $post_type_object ) {
			wp_die( __( 'Invalid post type.' ) );
		}

		if ( ! current_user_can( 'delete_post', $post_id ) ) {
			wp_die( __( 'Sorry, you are not allowed to restore this item from the Trash.' ) );
		}

		if ( ! wp_untrash_post( $post_id ) ) {
			wp_die( __( 'Error in restoring from Trash.' ) );
		}

		wp_redirect( add_query_arg( 'untrashed', 1, $sendback ) );
		exit();

	case 'delete':
		check_admin_referer( 'delete-post_' . $post_id );

		if ( ! $post ) {
			wp_die( __( 'This item has already been deleted.' ) );
		}

		if ( ! $post_type_object ) {
			wp_die( __( 'Invalid post type.' ) );
		}

		if ( ! current_user_can( 'delete_post', $post_id ) ) {
			wp_die( __( 'Sorry, you are not allowed to delete this item.' ) );
		}

		if ( $post->post_type == 'attachment' ) {
			$force = ( ! MEDIA_TRASH );
			if ( ! wp_delete_attachment( $post_id, $force ) ) {
				wp_die( __( 'Error in deleting.' ) );
			}
		} else {
			if ( ! wp_delete_post( $post_id, true ) ) {
				wp_die( __( 'Error in deleting.' ) );
			}
		}

		wp_redirect( add_query_arg( 'deleted', 1, $sendback ) );
		exit();

	case 'preview':
		check_admin_referer( 'update-post_' . $post_id );

		$url = post_preview();

		wp_redirect( $url );
		exit();

	case 'toggle-custom-fields':
		check_admin_referer( 'toggle-custom-fields' );

		$current_user_id = get_current_user_id();
		if ( $current_user_id ) {
			$enable_custom_fields = (bool) get_user_meta( $current_user_id, 'enable_custom_fields', true );
			update_user_meta( $current_user_id, 'enable_custom_fields', ! $enable_custom_fields );
		}

		wp_safe_redirect( wp_get_referer() );
		exit();

	default:
		/**
		 * Fires for a given custom post action request.
		 *
		 * The dynamic portion of the hook name, `$action`, refers to the custom post action.
		 *
		 * @since 4.6.0
		 *
		 * @param int $post_id Post ID sent with the request.
		 */
		do_action( "post_action_{$action}", $post_id );

		wp_redirect( admin_url( 'edit.php' ) );
		exit();
} // end switch
include( ABSPATH . 'wp-admin/admin-footer.php' );
home/xbodynamge/namtation/wp-admin/includes/post.php000064400000221420151130651550016646 0ustar00<?php
/**
 * WordPress Post Administration API.
 *
 * @package WordPress
 * @subpackage Administration
 */

/**
 * Rename $_POST data from form names to DB post columns.
 *
 * Manipulates $_POST directly.
 *
 * @since 2.6.0
 *
 * @param bool $update Are we updating a pre-existing post?
 * @param array $post_data Array of post data. Defaults to the contents of $_POST.
 * @return object|bool WP_Error on failure, true on success.
 */
function _wp_translate_postdata( $update = false, $post_data = null ) {

	if ( empty( $post_data ) ) {
		$post_data = &$_POST;
	}

	if ( $update ) {
		$post_data['ID'] = (int) $post_data['post_ID'];
	}

	$ptype = get_post_type_object( $post_data['post_type'] );

	if ( $update && ! current_user_can( 'edit_post', $post_data['ID'] ) ) {
		if ( 'page' == $post_data['post_type'] ) {
			return new WP_Error( 'edit_others_pages', __( 'Sorry, you are not allowed to edit pages as this user.' ) );
		} else {
			return new WP_Error( 'edit_others_posts', __( 'Sorry, you are not allowed to edit posts as this user.' ) );
		}
	} elseif ( ! $update && ! current_user_can( $ptype->cap->create_posts ) ) {
		if ( 'page' == $post_data['post_type'] ) {
			return new WP_Error( 'edit_others_pages', __( 'Sorry, you are not allowed to create pages as this user.' ) );
		} else {
			return new WP_Error( 'edit_others_posts', __( 'Sorry, you are not allowed to create posts as this user.' ) );
		}
	}

	if ( isset( $post_data['content'] ) ) {
		$post_data['post_content'] = $post_data['content'];
	}

	if ( isset( $post_data['excerpt'] ) ) {
		$post_data['post_excerpt'] = $post_data['excerpt'];
	}

	if ( isset( $post_data['parent_id'] ) ) {
		$post_data['post_parent'] = (int) $post_data['parent_id'];
	}

	if ( isset( $post_data['trackback_url'] ) ) {
		$post_data['to_ping'] = $post_data['trackback_url'];
	}

	$post_data['user_ID'] = get_current_user_id();

	if ( ! empty( $post_data['post_author_override'] ) ) {
		$post_data['post_author'] = (int) $post_data['post_author_override'];
	} else {
		if ( ! empty( $post_data['post_author'] ) ) {
			$post_data['post_author'] = (int) $post_data['post_author'];
		} else {
			$post_data['post_author'] = (int) $post_data['user_ID'];
		}
	}

	if ( isset( $post_data['user_ID'] ) && ( $post_data['post_author'] != $post_data['user_ID'] )
		&& ! current_user_can( $ptype->cap->edit_others_posts ) ) {

		if ( $update ) {
			if ( 'page' == $post_data['post_type'] ) {
				return new WP_Error( 'edit_others_pages', __( 'Sorry, you are not allowed to edit pages as this user.' ) );
			} else {
				return new WP_Error( 'edit_others_posts', __( 'Sorry, you are not allowed to edit posts as this user.' ) );
			}
		} else {
			if ( 'page' == $post_data['post_type'] ) {
				return new WP_Error( 'edit_others_pages', __( 'Sorry, you are not allowed to create pages as this user.' ) );
			} else {
				return new WP_Error( 'edit_others_posts', __( 'Sorry, you are not allowed to create posts as this user.' ) );
			}
		}
	}

	if ( ! empty( $post_data['post_status'] ) ) {
		$post_data['post_status'] = sanitize_key( $post_data['post_status'] );

		// No longer an auto-draft
		if ( 'auto-draft' === $post_data['post_status'] ) {
			$post_data['post_status'] = 'draft';
		}

		if ( ! get_post_status_object( $post_data['post_status'] ) ) {
			unset( $post_data['post_status'] );
		}
	}

	// What to do based on which button they pressed
	if ( isset( $post_data['saveasdraft'] ) && '' != $post_data['saveasdraft'] ) {
		$post_data['post_status'] = 'draft';
	}
	if ( isset( $post_data['saveasprivate'] ) && '' != $post_data['saveasprivate'] ) {
		$post_data['post_status'] = 'private';
	}
	if ( isset( $post_data['publish'] ) && ( '' != $post_data['publish'] ) && ( ! isset( $post_data['post_status'] ) || $post_data['post_status'] != 'private' ) ) {
		$post_data['post_status'] = 'publish';
	}
	if ( isset( $post_data['advanced'] ) && '' != $post_data['advanced'] ) {
		$post_data['post_status'] = 'draft';
	}
	if ( isset( $post_data['pending'] ) && '' != $post_data['pending'] ) {
		$post_data['post_status'] = 'pending';
	}

	if ( isset( $post_data['ID'] ) ) {
		$post_id = $post_data['ID'];
	} else {
		$post_id = false;
	}
	$previous_status = $post_id ? get_post_field( 'post_status', $post_id ) : false;

	if ( isset( $post_data['post_status'] ) && 'private' == $post_data['post_status'] && ! current_user_can( $ptype->cap->publish_posts ) ) {
		$post_data['post_status'] = $previous_status ? $previous_status : 'pending';
	}

	$published_statuses = array( 'publish', 'future' );

	// Posts 'submitted for approval' present are submitted to $_POST the same as if they were being published.
	// Change status from 'publish' to 'pending' if user lacks permissions to publish or to resave published posts.
	if ( isset( $post_data['post_status'] ) && ( in_array( $post_data['post_status'], $published_statuses ) && ! current_user_can( $ptype->cap->publish_posts ) ) ) {
		if ( ! in_array( $previous_status, $published_statuses ) || ! current_user_can( 'edit_post', $post_id ) ) {
			$post_data['post_status'] = 'pending';
		}
	}

	if ( ! isset( $post_data['post_status'] ) ) {
		$post_data['post_status'] = 'auto-draft' === $previous_status ? 'draft' : $previous_status;
	}

	if ( isset( $post_data['post_password'] ) && ! current_user_can( $ptype->cap->publish_posts ) ) {
		unset( $post_data['post_password'] );
	}

	if ( ! isset( $post_data['comment_status'] ) ) {
		$post_data['comment_status'] = 'closed';
	}

	if ( ! isset( $post_data['ping_status'] ) ) {
		$post_data['ping_status'] = 'closed';
	}

	foreach ( array( 'aa', 'mm', 'jj', 'hh', 'mn' ) as $timeunit ) {
		if ( ! empty( $post_data[ 'hidden_' . $timeunit ] ) && $post_data[ 'hidden_' . $timeunit ] != $post_data[ $timeunit ] ) {
			$post_data['edit_date'] = '1';
			break;
		}
	}

	if ( ! empty( $post_data['edit_date'] ) ) {
		$aa                     = $post_data['aa'];
		$mm                     = $post_data['mm'];
		$jj                     = $post_data['jj'];
		$hh                     = $post_data['hh'];
		$mn                     = $post_data['mn'];
		$ss                     = $post_data['ss'];
		$aa                     = ( $aa <= 0 ) ? date( 'Y' ) : $aa;
		$mm                     = ( $mm <= 0 ) ? date( 'n' ) : $mm;
		$jj                     = ( $jj > 31 ) ? 31 : $jj;
		$jj                     = ( $jj <= 0 ) ? date( 'j' ) : $jj;
		$hh                     = ( $hh > 23 ) ? $hh - 24 : $hh;
		$mn                     = ( $mn > 59 ) ? $mn - 60 : $mn;
		$ss                     = ( $ss > 59 ) ? $ss - 60 : $ss;
		$post_data['post_date'] = sprintf( '%04d-%02d-%02d %02d:%02d:%02d', $aa, $mm, $jj, $hh, $mn, $ss );
		$valid_date             = wp_checkdate( $mm, $jj, $aa, $post_data['post_date'] );
		if ( ! $valid_date ) {
			return new WP_Error( 'invalid_date', __( 'Invalid date.' ) );
		}
		$post_data['post_date_gmt'] = get_gmt_from_date( $post_data['post_date'] );
	}

	if ( isset( $post_data['post_category'] ) ) {
		$category_object = get_taxonomy( 'category' );
		if ( ! current_user_can( $category_object->cap->assign_terms ) ) {
			unset( $post_data['post_category'] );
		}
	}

	return $post_data;
}

/**
 * Returns only allowed post data fields
 *
 * @since 5.0.1
 *
 * @param array $post_data Array of post data. Defaults to the contents of $_POST.
 * @return object|bool WP_Error on failure, true on success.
 */
function _wp_get_allowed_postdata( $post_data = null ) {
	if ( empty( $post_data ) ) {
		$post_data = $_POST;
	}

	// Pass through errors
	if ( is_wp_error( $post_data ) ) {
		return $post_data;
	}

	return array_diff_key( $post_data, array_flip( array( 'meta_input', 'file', 'guid' ) ) );
}

/**
 * Update an existing post with values provided in $_POST.
 *
 * @since 1.5.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param array $post_data Optional.
 * @return int Post ID.
 */
function edit_post( $post_data = null ) {
	global $wpdb;

	if ( empty( $post_data ) ) {
		$post_data = &$_POST;
	}

	// Clear out any data in internal vars.
	unset( $post_data['filter'] );

	$post_ID                     = (int) $post_data['post_ID'];
	$post                        = get_post( $post_ID );
	$post_data['post_type']      = $post->post_type;
	$post_data['post_mime_type'] = $post->post_mime_type;

	if ( ! empty( $post_data['post_status'] ) ) {
		$post_data['post_status'] = sanitize_key( $post_data['post_status'] );

		if ( 'inherit' == $post_data['post_status'] ) {
			unset( $post_data['post_status'] );
		}
	}

	$ptype = get_post_type_object( $post_data['post_type'] );
	if ( ! current_user_can( 'edit_post', $post_ID ) ) {
		if ( 'page' == $post_data['post_type'] ) {
			wp_die( __( 'Sorry, you are not allowed to edit this page.' ) );
		} else {
			wp_die( __( 'Sorry, you are not allowed to edit this post.' ) );
		}
	}

	if ( post_type_supports( $ptype->name, 'revisions' ) ) {
		$revisions = wp_get_post_revisions(
			$post_ID,
			array(
				'order'          => 'ASC',
				'posts_per_page' => 1,
			)
		);
		$revision  = current( $revisions );

		// Check if the revisions have been upgraded
		if ( $revisions && _wp_get_post_revision_version( $revision ) < 1 ) {
			_wp_upgrade_revisions_of_post( $post, wp_get_post_revisions( $post_ID ) );
		}
	}

	if ( isset( $post_data['visibility'] ) ) {
		switch ( $post_data['visibility'] ) {
			case 'public':
				$post_data['post_password'] = '';
				break;
			case 'password':
				unset( $post_data['sticky'] );
				break;
			case 'private':
				$post_data['post_status']   = 'private';
				$post_data['post_password'] = '';
				unset( $post_data['sticky'] );
				break;
		}
	}

	$post_data = _wp_translate_postdata( true, $post_data );
	if ( is_wp_error( $post_data ) ) {
		wp_die( $post_data->get_error_message() );
	}
	$translated = _wp_get_allowed_postdata( $post_data );

	// Post Formats
	if ( isset( $post_data['post_format'] ) ) {
		set_post_format( $post_ID, $post_data['post_format'] );
	}

	$format_meta_urls = array( 'url', 'link_url', 'quote_source_url' );
	foreach ( $format_meta_urls as $format_meta_url ) {
		$keyed = '_format_' . $format_meta_url;
		if ( isset( $post_data[ $keyed ] ) ) {
			update_post_meta( $post_ID, $keyed, wp_slash( esc_url_raw( wp_unslash( $post_data[ $keyed ] ) ) ) );
		}
	}

	$format_keys = array( 'quote', 'quote_source_name', 'image', 'gallery', 'audio_embed', 'video_embed' );

	foreach ( $format_keys as $key ) {
		$keyed = '_format_' . $key;
		if ( isset( $post_data[ $keyed ] ) ) {
			if ( current_user_can( 'unfiltered_html' ) ) {
				update_post_meta( $post_ID, $keyed, $post_data[ $keyed ] );
			} else {
				update_post_meta( $post_ID, $keyed, wp_filter_post_kses( $post_data[ $keyed ] ) );
			}
		}
	}

	if ( 'attachment' === $post_data['post_type'] && preg_match( '#^(audio|video)/#', $post_data['post_mime_type'] ) ) {
		$id3data = wp_get_attachment_metadata( $post_ID );
		if ( ! is_array( $id3data ) ) {
			$id3data = array();
		}

		foreach ( wp_get_attachment_id3_keys( $post, 'edit' ) as $key => $label ) {
			if ( isset( $post_data[ 'id3_' . $key ] ) ) {
				$id3data[ $key ] = sanitize_text_field( wp_unslash( $post_data[ 'id3_' . $key ] ) );
			}
		}
		wp_update_attachment_metadata( $post_ID, $id3data );
	}

	// Meta Stuff
	if ( isset( $post_data['meta'] ) && $post_data['meta'] ) {
		foreach ( $post_data['meta'] as $key => $value ) {
			if ( ! $meta = get_post_meta_by_id( $key ) ) {
				continue;
			}
			if ( $meta->post_id != $post_ID ) {
				continue;
			}
			if ( is_protected_meta( $meta->meta_key, 'post' ) || ! current_user_can( 'edit_post_meta', $post_ID, $meta->meta_key ) ) {
				continue;
			}
			if ( is_protected_meta( $value['key'], 'post' ) || ! current_user_can( 'edit_post_meta', $post_ID, $value['key'] ) ) {
				continue;
			}
			update_meta( $key, $value['key'], $value['value'] );
		}
	}

	if ( isset( $post_data['deletemeta'] ) && $post_data['deletemeta'] ) {
		foreach ( $post_data['deletemeta'] as $key => $value ) {
			if ( ! $meta = get_post_meta_by_id( $key ) ) {
				continue;
			}
			if ( $meta->post_id != $post_ID ) {
				continue;
			}
			if ( is_protected_meta( $meta->meta_key, 'post' ) || ! current_user_can( 'delete_post_meta', $post_ID, $meta->meta_key ) ) {
				continue;
			}
			delete_meta( $key );
		}
	}

	// Attachment stuff
	if ( 'attachment' == $post_data['post_type'] ) {
		if ( isset( $post_data['_wp_attachment_image_alt'] ) ) {
			$image_alt = wp_unslash( $post_data['_wp_attachment_image_alt'] );
			if ( $image_alt != get_post_meta( $post_ID, '_wp_attachment_image_alt', true ) ) {
				$image_alt = wp_strip_all_tags( $image_alt, true );
				// update_meta expects slashed.
				update_post_meta( $post_ID, '_wp_attachment_image_alt', wp_slash( $image_alt ) );
			}
		}

		$attachment_data = isset( $post_data['attachments'][ $post_ID ] ) ? $post_data['attachments'][ $post_ID ] : array();

		/** This filter is documented in wp-admin/includes/media.php */
		$translated = apply_filters( 'attachment_fields_to_save', $translated, $attachment_data );
	}

	// Convert taxonomy input to term IDs, to avoid ambiguity.
	if ( isset( $post_data['tax_input'] ) ) {
		foreach ( (array) $post_data['tax_input'] as $taxonomy => $terms ) {
			$tax_object = get_taxonomy( $taxonomy );

			if ( $tax_object && isset( $tax_object->meta_box_sanitize_cb ) ) {
				$translated['tax_input'][ $taxonomy ] = call_user_func_array( $tax_object->meta_box_sanitize_cb, array( $taxonomy, $terms ) );
			}
		}
	}

	add_meta( $post_ID );

	update_post_meta( $post_ID, '_edit_last', get_current_user_id() );

	$success = wp_update_post( $translated );
	// If the save failed, see if we can sanity check the main fields and try again
	if ( ! $success && is_callable( array( $wpdb, 'strip_invalid_text_for_column' ) ) ) {
		$fields = array( 'post_title', 'post_content', 'post_excerpt' );

		foreach ( $fields as $field ) {
			if ( isset( $translated[ $field ] ) ) {
				$translated[ $field ] = $wpdb->strip_invalid_text_for_column( $wpdb->posts, $field, $translated[ $field ] );
			}
		}

		wp_update_post( $translated );
	}

	// Now that we have an ID we can fix any attachment anchor hrefs
	_fix_attachment_links( $post_ID );

	wp_set_post_lock( $post_ID );

	if ( current_user_can( $ptype->cap->edit_others_posts ) && current_user_can( $ptype->cap->publish_posts ) ) {
		if ( ! empty( $post_data['sticky'] ) ) {
			stick_post( $post_ID );
		} else {
			unstick_post( $post_ID );
		}
	}

	return $post_ID;
}

/**
 * Process the post data for the bulk editing of posts.
 *
 * Updates all bulk edited posts/pages, adding (but not removing) tags and
 * categories. Skips pages when they would be their own parent or child.
 *
 * @since 2.7.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param array $post_data Optional, the array of post data to process if not provided will use $_POST superglobal.
 * @return array
 */
function bulk_edit_posts( $post_data = null ) {
	global $wpdb;

	if ( empty( $post_data ) ) {
		$post_data = &$_POST;
	}

	if ( isset( $post_data['post_type'] ) ) {
		$ptype = get_post_type_object( $post_data['post_type'] );
	} else {
		$ptype = get_post_type_object( 'post' );
	}

	if ( ! current_user_can( $ptype->cap->edit_posts ) ) {
		if ( 'page' == $ptype->name ) {
			wp_die( __( 'Sorry, you are not allowed to edit pages.' ) );
		} else {
			wp_die( __( 'Sorry, you are not allowed to edit posts.' ) );
		}
	}

	if ( -1 == $post_data['_status'] ) {
		$post_data['post_status'] = null;
		unset( $post_data['post_status'] );
	} else {
		$post_data['post_status'] = $post_data['_status'];
	}
	unset( $post_data['_status'] );

	if ( ! empty( $post_data['post_status'] ) ) {
		$post_data['post_status'] = sanitize_key( $post_data['post_status'] );

		if ( 'inherit' == $post_data['post_status'] ) {
			unset( $post_data['post_status'] );
		}
	}

	$post_IDs = array_map( 'intval', (array) $post_data['post'] );

	$reset = array(
		'post_author',
		'post_status',
		'post_password',
		'post_parent',
		'page_template',
		'comment_status',
		'ping_status',
		'keep_private',
		'tax_input',
		'post_category',
		'sticky',
		'post_format',
	);

	foreach ( $reset as $field ) {
		if ( isset( $post_data[ $field ] ) && ( '' == $post_data[ $field ] || -1 == $post_data[ $field ] ) ) {
			unset( $post_data[ $field ] );
		}
	}

	if ( isset( $post_data['post_category'] ) ) {
		if ( is_array( $post_data['post_category'] ) && ! empty( $post_data['post_category'] ) ) {
			$new_cats = array_map( 'absint', $post_data['post_category'] );
		} else {
			unset( $post_data['post_category'] );
		}
	}

	$tax_input = array();
	if ( isset( $post_data['tax_input'] ) ) {
		foreach ( $post_data['tax_input'] as $tax_name => $terms ) {
			if ( empty( $terms ) ) {
				continue;
			}
			if ( is_taxonomy_hierarchical( $tax_name ) ) {
				$tax_input[ $tax_name ] = array_map( 'absint', $terms );
			} else {
				$comma = _x( ',', 'tag delimiter' );
				if ( ',' !== $comma ) {
					$terms = str_replace( $comma, ',', $terms );
				}
				$tax_input[ $tax_name ] = explode( ',', trim( $terms, " \n\t\r\0\x0B," ) );
			}
		}
	}

	if ( isset( $post_data['post_parent'] ) && ( $parent = (int) $post_data['post_parent'] ) ) {
		$pages    = $wpdb->get_results( "SELECT ID, post_parent FROM $wpdb->posts WHERE post_type = 'page'" );
		$children = array();

		for ( $i = 0; $i < 50 && $parent > 0; $i++ ) {
			$children[] = $parent;

			foreach ( $pages as $page ) {
				if ( $page->ID == $parent ) {
					$parent = $page->post_parent;
					break;
				}
			}
		}
	}

	$updated          = $skipped = $locked = array();
	$shared_post_data = $post_data;

	foreach ( $post_IDs as $post_ID ) {
		// Start with fresh post data with each iteration.
		$post_data = $shared_post_data;

		$post_type_object = get_post_type_object( get_post_type( $post_ID ) );

		if ( ! isset( $post_type_object ) || ( isset( $children ) && in_array( $post_ID, $children ) ) || ! current_user_can( 'edit_post', $post_ID ) ) {
			$skipped[] = $post_ID;
			continue;
		}

		if ( wp_check_post_lock( $post_ID ) ) {
			$locked[] = $post_ID;
			continue;
		}

		$post      = get_post( $post_ID );
		$tax_names = get_object_taxonomies( $post );
		foreach ( $tax_names as $tax_name ) {
			$taxonomy_obj = get_taxonomy( $tax_name );
			if ( isset( $tax_input[ $tax_name ] ) && current_user_can( $taxonomy_obj->cap->assign_terms ) ) {
				$new_terms = $tax_input[ $tax_name ];
			} else {
				$new_terms = array();
			}

			if ( $taxonomy_obj->hierarchical ) {
				$current_terms = (array) wp_get_object_terms( $post_ID, $tax_name, array( 'fields' => 'ids' ) );
			} else {
				$current_terms = (array) wp_get_object_terms( $post_ID, $tax_name, array( 'fields' => 'names' ) );
			}

			$post_data['tax_input'][ $tax_name ] = array_merge( $current_terms, $new_terms );
		}

		if ( isset( $new_cats ) && in_array( 'category', $tax_names ) ) {
			$cats                       = (array) wp_get_post_categories( $post_ID );
			$post_data['post_category'] = array_unique( array_merge( $cats, $new_cats ) );
			unset( $post_data['tax_input']['category'] );
		}

		$post_data['post_ID']        = $post_ID;
		$post_data['post_type']      = $post->post_type;
		$post_data['post_mime_type'] = $post->post_mime_type;

		foreach ( array( 'comment_status', 'ping_status', 'post_author' ) as $field ) {
			if ( ! isset( $post_data[ $field ] ) ) {
				$post_data[ $field ] = $post->$field;
			}
		}

		$post_data = _wp_translate_postdata( true, $post_data );
		if ( is_wp_error( $post_data ) ) {
			$skipped[] = $post_ID;
			continue;
		}
		$post_data = _wp_get_allowed_postdata( $post_data );

		if ( isset( $shared_post_data['post_format'] ) ) {
			set_post_format( $post_ID, $shared_post_data['post_format'] );
		}

		// Prevent wp_insert_post() from overwriting post format with the old data.
		unset( $post_data['tax_input']['post_format'] );

		$updated[] = wp_update_post( $post_data );

		if ( isset( $post_data['sticky'] ) && current_user_can( $ptype->cap->edit_others_posts ) ) {
			if ( 'sticky' == $post_data['sticky'] ) {
				stick_post( $post_ID );
			} else {
				unstick_post( $post_ID );
			}
		}
	}

	return array(
		'updated' => $updated,
		'skipped' => $skipped,
		'locked'  => $locked,
	);
}

/**
 * Default post information to use when populating the "Write Post" form.
 *
 * @since 2.0.0
 *
 * @param string $post_type    Optional. A post type string. Default 'post'.
 * @param bool   $create_in_db Optional. Whether to insert the post into database. Default false.
 * @return WP_Post Post object containing all the default post data as attributes
 */
function get_default_post_to_edit( $post_type = 'post', $create_in_db = false ) {
	$post_title = '';
	if ( ! empty( $_REQUEST['post_title'] ) ) {
		$post_title = esc_html( wp_unslash( $_REQUEST['post_title'] ) );
	}

	$post_content = '';
	if ( ! empty( $_REQUEST['content'] ) ) {
		$post_content = esc_html( wp_unslash( $_REQUEST['content'] ) );
	}

	$post_excerpt = '';
	if ( ! empty( $_REQUEST['excerpt'] ) ) {
		$post_excerpt = esc_html( wp_unslash( $_REQUEST['excerpt'] ) );
	}

	if ( $create_in_db ) {
		$post_id = wp_insert_post(
			array(
				'post_title'  => __( 'Auto Draft' ),
				'post_type'   => $post_type,
				'post_status' => 'auto-draft',
			)
		);
		$post    = get_post( $post_id );
		if ( current_theme_supports( 'post-formats' ) && post_type_supports( $post->post_type, 'post-formats' ) && get_option( 'default_post_format' ) ) {
			set_post_format( $post, get_option( 'default_post_format' ) );
		}

		// Schedule auto-draft cleanup
		if ( ! wp_next_scheduled( 'wp_scheduled_auto_draft_delete' ) ) {
			wp_schedule_event( time(), 'daily', 'wp_scheduled_auto_draft_delete' );
		}
	} else {
		$post                 = new stdClass;
		$post->ID             = 0;
		$post->post_author    = '';
		$post->post_date      = '';
		$post->post_date_gmt  = '';
		$post->post_password  = '';
		$post->post_name      = '';
		$post->post_type      = $post_type;
		$post->post_status    = 'draft';
		$post->to_ping        = '';
		$post->pinged         = '';
		$post->comment_status = get_default_comment_status( $post_type );
		$post->ping_status    = get_default_comment_status( $post_type, 'pingback' );
		$post->post_pingback  = get_option( 'default_pingback_flag' );
		$post->post_category  = get_option( 'default_category' );
		$post->page_template  = 'default';
		$post->post_parent    = 0;
		$post->menu_order     = 0;
		$post                 = new WP_Post( $post );
	}

	/**
	 * Filters the default post content initially used in the "Write Post" form.
	 *
	 * @since 1.5.0
	 *
	 * @param string  $post_content Default post content.
	 * @param WP_Post $post         Post object.
	 */
	$post->post_content = (string) apply_filters( 'default_content', $post_content, $post );

	/**
	 * Filters the default post title initially used in the "Write Post" form.
	 *
	 * @since 1.5.0
	 *
	 * @param string  $post_title Default post title.
	 * @param WP_Post $post       Post object.
	 */
	$post->post_title = (string) apply_filters( 'default_title', $post_title, $post );

	/**
	 * Filters the default post excerpt initially used in the "Write Post" form.
	 *
	 * @since 1.5.0
	 *
	 * @param string  $post_excerpt Default post excerpt.
	 * @param WP_Post $post         Post object.
	 */
	$post->post_excerpt = (string) apply_filters( 'default_excerpt', $post_excerpt, $post );

	return $post;
}

/**
 * Determines if a post exists based on title, content, date and type.
 *
 * @since 2.0.0
 * @since 5.2.0 Added the `$type` parameter.
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $title   Post title.
 * @param string $content Optional post content.
 * @param string $date    Optional post date.
 * @param string $type    Optional post type.
 * @return int Post ID if post exists, 0 otherwise.
 */
function post_exists( $title, $content = '', $date = '', $type = '' ) {
	global $wpdb;

	$post_title   = wp_unslash( sanitize_post_field( 'post_title', $title, 0, 'db' ) );
	$post_content = wp_unslash( sanitize_post_field( 'post_content', $content, 0, 'db' ) );
	$post_date    = wp_unslash( sanitize_post_field( 'post_date', $date, 0, 'db' ) );
	$post_type    = wp_unslash( sanitize_post_field( 'post_type', $type, 0, 'db' ) );

	$query = "SELECT ID FROM $wpdb->posts WHERE 1=1";
	$args  = array();

	if ( ! empty( $date ) ) {
		$query .= ' AND post_date = %s';
		$args[] = $post_date;
	}

	if ( ! empty( $title ) ) {
		$query .= ' AND post_title = %s';
		$args[] = $post_title;
	}

	if ( ! empty( $content ) ) {
		$query .= ' AND post_content = %s';
		$args[] = $post_content;
	}

	if ( ! empty( $type ) ) {
		$query .= ' AND post_type = %s';
		$args[] = $post_type;
	}

	if ( ! empty( $args ) ) {
		return (int) $wpdb->get_var( $wpdb->prepare( $query, $args ) );
	}

	return 0;
}

/**
 * Creates a new post from the "Write Post" form using $_POST information.
 *
 * @since 2.1.0
 *
 * @global WP_User $current_user
 *
 * @return int|WP_Error
 */
function wp_write_post() {
	if ( isset( $_POST['post_type'] ) ) {
		$ptype = get_post_type_object( $_POST['post_type'] );
	} else {
		$ptype = get_post_type_object( 'post' );
	}

	if ( ! current_user_can( $ptype->cap->edit_posts ) ) {
		if ( 'page' == $ptype->name ) {
			return new WP_Error( 'edit_pages', __( 'Sorry, you are not allowed to create pages on this site.' ) );
		} else {
			return new WP_Error( 'edit_posts', __( 'Sorry, you are not allowed to create posts or drafts on this site.' ) );
		}
	}

	$_POST['post_mime_type'] = '';

	// Clear out any data in internal vars.
	unset( $_POST['filter'] );

	// Edit don't write if we have a post id.
	if ( isset( $_POST['post_ID'] ) ) {
		return edit_post();
	}

	if ( isset( $_POST['visibility'] ) ) {
		switch ( $_POST['visibility'] ) {
			case 'public':
				$_POST['post_password'] = '';
				break;
			case 'password':
				unset( $_POST['sticky'] );
				break;
			case 'private':
				$_POST['post_status']   = 'private';
				$_POST['post_password'] = '';
				unset( $_POST['sticky'] );
				break;
		}
	}

	$translated = _wp_translate_postdata( false );
	if ( is_wp_error( $translated ) ) {
		return $translated;
	}
	$translated = _wp_get_allowed_postdata( $translated );

	// Create the post.
	$post_ID = wp_insert_post( $translated );
	if ( is_wp_error( $post_ID ) ) {
		return $post_ID;
	}

	if ( empty( $post_ID ) ) {
		return 0;
	}

	add_meta( $post_ID );

	add_post_meta( $post_ID, '_edit_last', $GLOBALS['current_user']->ID );

	// Now that we have an ID we can fix any attachment anchor hrefs
	_fix_attachment_links( $post_ID );

	wp_set_post_lock( $post_ID );

	return $post_ID;
}

/**
 * Calls wp_write_post() and handles the errors.
 *
 * @since 2.0.0
 *
 * @return int|null
 */
function write_post() {
	$result = wp_write_post();
	if ( is_wp_error( $result ) ) {
		wp_die( $result->get_error_message() );
	} else {
		return $result;
	}
}

//
// Post Meta
//

/**
 * Add post meta data defined in $_POST superglobal for post with given ID.
 *
 * @since 1.2.0
 *
 * @param int $post_ID
 * @return int|bool
 */
function add_meta( $post_ID ) {
	$post_ID = (int) $post_ID;

	$metakeyselect = isset( $_POST['metakeyselect'] ) ? wp_unslash( trim( $_POST['metakeyselect'] ) ) : '';
	$metakeyinput  = isset( $_POST['metakeyinput'] ) ? wp_unslash( trim( $_POST['metakeyinput'] ) ) : '';
	$metavalue     = isset( $_POST['metavalue'] ) ? $_POST['metavalue'] : '';
	if ( is_string( $metavalue ) ) {
		$metavalue = trim( $metavalue );
	}

	if ( ( ( '#NONE#' != $metakeyselect ) && ! empty( $metakeyselect ) ) || ! empty( $metakeyinput ) ) {
		/*
		 * We have a key/value pair. If both the select and the input
		 * for the key have data, the input takes precedence.
		 */
		if ( '#NONE#' != $metakeyselect ) {
			$metakey = $metakeyselect;
		}

		if ( $metakeyinput ) {
			$metakey = $metakeyinput; // default
		}

		if ( is_protected_meta( $metakey, 'post' ) || ! current_user_can( 'add_post_meta', $post_ID, $metakey ) ) {
			return false;
		}

		$metakey = wp_slash( $metakey );

		return add_post_meta( $post_ID, $metakey, $metavalue );
	}

	return false;
} // add_meta

/**
 * Delete post meta data by meta ID.
 *
 * @since 1.2.0
 *
 * @param int $mid
 * @return bool
 */
function delete_meta( $mid ) {
	return delete_metadata_by_mid( 'post', $mid );
}

/**
 * Get a list of previously defined keys.
 *
 * @since 1.2.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @return mixed
 */
function get_meta_keys() {
	global $wpdb;

	$keys = $wpdb->get_col(
		"
			SELECT meta_key
			FROM $wpdb->postmeta
			GROUP BY meta_key
			ORDER BY meta_key"
	);

	return $keys;
}

/**
 * Get post meta data by meta ID.
 *
 * @since 2.1.0
 *
 * @param int $mid
 * @return object|bool
 */
function get_post_meta_by_id( $mid ) {
	return get_metadata_by_mid( 'post', $mid );
}

/**
 * Get meta data for the given post ID.
 *
 * @since 1.2.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int $postid
 * @return mixed
 */
function has_meta( $postid ) {
	global $wpdb;

	return $wpdb->get_results(
		$wpdb->prepare(
			"SELECT meta_key, meta_value, meta_id, post_id
			FROM $wpdb->postmeta WHERE post_id = %d
			ORDER BY meta_key,meta_id",
			$postid
		),
		ARRAY_A
	);
}

/**
 * Update post meta data by meta ID.
 *
 * @since 1.2.0
 *
 * @param int    $meta_id
 * @param string $meta_key Expect Slashed
 * @param string $meta_value Expect Slashed
 * @return bool
 */
function update_meta( $meta_id, $meta_key, $meta_value ) {
	$meta_key   = wp_unslash( $meta_key );
	$meta_value = wp_unslash( $meta_value );

	return update_metadata_by_mid( 'post', $meta_id, $meta_value, $meta_key );
}

//
// Private
//

/**
 * Replace hrefs of attachment anchors with up-to-date permalinks.
 *
 * @since 2.3.0
 * @access private
 *
 * @param int|object $post Post ID or post object.
 * @return void|int|WP_Error Void if nothing fixed. 0 or WP_Error on update failure. The post ID on update success.
 */
function _fix_attachment_links( $post ) {
	$post    = get_post( $post, ARRAY_A );
	$content = $post['post_content'];

	// Don't run if no pretty permalinks or post is not published, scheduled, or privately published.
	if ( ! get_option( 'permalink_structure' ) || ! in_array( $post['post_status'], array( 'publish', 'future', 'private' ) ) ) {
		return;
	}

	// Short if there aren't any links or no '?attachment_id=' strings (strpos cannot be zero)
	if ( ! strpos( $content, '?attachment_id=' ) || ! preg_match_all( '/<a ([^>]+)>[\s\S]+?<\/a>/', $content, $link_matches ) ) {
		return;
	}

	$site_url = get_bloginfo( 'url' );
	$site_url = substr( $site_url, (int) strpos( $site_url, '://' ) ); // remove the http(s)
	$replace  = '';

	foreach ( $link_matches[1] as $key => $value ) {
		if ( ! strpos( $value, '?attachment_id=' ) || ! strpos( $value, 'wp-att-' )
			|| ! preg_match( '/href=(["\'])[^"\']*\?attachment_id=(\d+)[^"\']*\\1/', $value, $url_match )
			|| ! preg_match( '/rel=["\'][^"\']*wp-att-(\d+)/', $value, $rel_match ) ) {
				continue;
		}

		$quote  = $url_match[1]; // the quote (single or double)
		$url_id = (int) $url_match[2];
		$rel_id = (int) $rel_match[1];

		if ( ! $url_id || ! $rel_id || $url_id != $rel_id || strpos( $url_match[0], $site_url ) === false ) {
			continue;
		}

		$link    = $link_matches[0][ $key ];
		$replace = str_replace( $url_match[0], 'href=' . $quote . get_attachment_link( $url_id ) . $quote, $link );

		$content = str_replace( $link, $replace, $content );
	}

	if ( $replace ) {
		$post['post_content'] = $content;
		// Escape data pulled from DB.
		$post = add_magic_quotes( $post );

		return wp_update_post( $post );
	}
}

/**
 * Get all the possible statuses for a post_type
 *
 * @since 2.5.0
 *
 * @param string $type The post_type you want the statuses for
 * @return array As array of all the statuses for the supplied post type
 */
function get_available_post_statuses( $type = 'post' ) {
	$stati = wp_count_posts( $type );

	return array_keys( get_object_vars( $stati ) );
}

/**
 * Run the wp query to fetch the posts for listing on the edit posts page
 *
 * @since 2.5.0
 *
 * @param array|bool $q Array of query variables to use to build the query or false to use $_GET superglobal.
 * @return array
 */
function wp_edit_posts_query( $q = false ) {
	if ( false === $q ) {
		$q = $_GET;
	}
	$q['m']     = isset( $q['m'] ) ? (int) $q['m'] : 0;
	$q['cat']   = isset( $q['cat'] ) ? (int) $q['cat'] : 0;
	$post_stati = get_post_stati();

	if ( isset( $q['post_type'] ) && in_array( $q['post_type'], get_post_types() ) ) {
		$post_type = $q['post_type'];
	} else {
		$post_type = 'post';
	}

	$avail_post_stati = get_available_post_statuses( $post_type );
	$post_status      = '';
	$perm             = '';

	if ( isset( $q['post_status'] ) && in_array( $q['post_status'], $post_stati ) ) {
		$post_status = $q['post_status'];
		$perm        = 'readable';
	}

	$orderby = '';

	if ( isset( $q['orderby'] ) ) {
		$orderby = $q['orderby'];
	} elseif ( isset( $q['post_status'] ) && in_array( $q['post_status'], array( 'pending', 'draft' ) ) ) {
		$orderby = 'modified';
	}

	$order = '';

	if ( isset( $q['order'] ) ) {
		$order = $q['order'];
	} elseif ( isset( $q['post_status'] ) && 'pending' == $q['post_status'] ) {
		$order = 'ASC';
	}

	$per_page       = "edit_{$post_type}_per_page";
	$posts_per_page = (int) get_user_option( $per_page );
	if ( empty( $posts_per_page ) || $posts_per_page < 1 ) {
		$posts_per_page = 20;
	}

	/**
	 * Filters the number of items per page to show for a specific 'per_page' type.
	 *
	 * The dynamic portion of the hook name, `$post_type`, refers to the post type.
	 *
	 * Some examples of filter hooks generated here include: 'edit_attachment_per_page',
	 * 'edit_post_per_page', 'edit_page_per_page', etc.
	 *
	 * @since 3.0.0
	 *
	 * @param int $posts_per_page Number of posts to display per page for the given post
	 *                            type. Default 20.
	 */
	$posts_per_page = apply_filters( "edit_{$post_type}_per_page", $posts_per_page );

	/**
	 * Filters the number of posts displayed per page when specifically listing "posts".
	 *
	 * @since 2.8.0
	 *
	 * @param int    $posts_per_page Number of posts to be displayed. Default 20.
	 * @param string $post_type      The post type.
	 */
	$posts_per_page = apply_filters( 'edit_posts_per_page', $posts_per_page, $post_type );

	$query = compact( 'post_type', 'post_status', 'perm', 'order', 'orderby', 'posts_per_page' );

	// Hierarchical types require special args.
	if ( is_post_type_hierarchical( $post_type ) && empty( $orderby ) ) {
		$query['orderby']                = 'menu_order title';
		$query['order']                  = 'asc';
		$query['posts_per_page']         = -1;
		$query['posts_per_archive_page'] = -1;
		$query['fields']                 = 'id=>parent';
	}

	if ( ! empty( $q['show_sticky'] ) ) {
		$query['post__in'] = (array) get_option( 'sticky_posts' );
	}

	wp( $query );

	return $avail_post_stati;
}

/**
 * Get the query variables for the current attachments request.
 *
 * @since 4.2.0
 *
 * @param array|false $q Optional. Array of query variables to use to build the query or false
 *                       to use $_GET superglobal. Default false.
 * @return array The parsed query vars.
 */
function wp_edit_attachments_query_vars( $q = false ) {
	if ( false === $q ) {
		$q = $_GET;
	}
	$q['m']         = isset( $q['m'] ) ? (int) $q['m'] : 0;
	$q['cat']       = isset( $q['cat'] ) ? (int) $q['cat'] : 0;
	$q['post_type'] = 'attachment';
	$post_type      = get_post_type_object( 'attachment' );
	$states         = 'inherit';
	if ( current_user_can( $post_type->cap->read_private_posts ) ) {
		$states .= ',private';
	}

	$q['post_status'] = isset( $q['status'] ) && 'trash' == $q['status'] ? 'trash' : $states;
	$q['post_status'] = isset( $q['attachment-filter'] ) && 'trash' == $q['attachment-filter'] ? 'trash' : $states;

	$media_per_page = (int) get_user_option( 'upload_per_page' );
	if ( empty( $media_per_page ) || $media_per_page < 1 ) {
		$media_per_page = 20;
	}

	/**
	 * Filters the number of items to list per page when listing media items.
	 *
	 * @since 2.9.0
	 *
	 * @param int $media_per_page Number of media to list. Default 20.
	 */
	$q['posts_per_page'] = apply_filters( 'upload_per_page', $media_per_page );

	$post_mime_types = get_post_mime_types();
	if ( isset( $q['post_mime_type'] ) && ! array_intersect( (array) $q['post_mime_type'], array_keys( $post_mime_types ) ) ) {
		unset( $q['post_mime_type'] );
	}

	foreach ( array_keys( $post_mime_types ) as $type ) {
		if ( isset( $q['attachment-filter'] ) && "post_mime_type:$type" == $q['attachment-filter'] ) {
			$q['post_mime_type'] = $type;
			break;
		}
	}

	if ( isset( $q['detached'] ) || ( isset( $q['attachment-filter'] ) && 'detached' == $q['attachment-filter'] ) ) {
		$q['post_parent'] = 0;
	}

	if ( isset( $q['mine'] ) || ( isset( $q['attachment-filter'] ) && 'mine' == $q['attachment-filter'] ) ) {
		$q['author'] = get_current_user_id();
	}

	// Filter query clauses to include filenames.
	if ( isset( $q['s'] ) ) {
		add_filter( 'wp_allow_query_attachment_by_filename', '__return_true' );
	}

	return $q;
}

/**
 * Executes a query for attachments. An array of WP_Query arguments
 * can be passed in, which will override the arguments set by this function.
 *
 * @since 2.5.0
 *
 * @param array|false $q Array of query variables to use to build the query or false to use $_GET superglobal.
 * @return array
 */
function wp_edit_attachments_query( $q = false ) {
	wp( wp_edit_attachments_query_vars( $q ) );

	$post_mime_types       = get_post_mime_types();
	$avail_post_mime_types = get_available_post_mime_types( 'attachment' );

	return array( $post_mime_types, $avail_post_mime_types );
}

/**
 * Returns the list of classes to be used by a meta box.
 *
 * @since 2.5.0
 *
 * @param string $box_id    Meta box ID (used in the 'id' attribute for the meta box).
 * @param string $screen_id The screen on which the meta box is shown.
 * @return string Space-separated string of class names.
 */
function postbox_classes( $box_id, $screen_id ) {
	if ( isset( $_GET['edit'] ) && $_GET['edit'] == $box_id ) {
		$classes = array( '' );
	} elseif ( $closed = get_user_option( 'closedpostboxes_' . $screen_id ) ) {
		if ( ! is_array( $closed ) ) {
			$classes = array( '' );
		} else {
			$classes = in_array( $box_id, $closed ) ? array( 'closed' ) : array( '' );
		}
	} else {
		$classes = array( '' );
	}

	/**
	 * Filters the postbox classes for a specific screen and box ID combo.
	 *
	 * The dynamic portions of the hook name, `$screen_id` and `$box_id`, refer to
	 * the screen ID and meta box ID, respectively.
	 *
	 * @since 3.2.0
	 *
	 * @param string[] $classes An array of postbox classes.
	 */
	$classes = apply_filters( "postbox_classes_{$screen_id}_{$box_id}", $classes );
	return implode( ' ', $classes );
}

/**
 * Get a sample permalink based off of the post name.
 *
 * @since 2.5.0
 *
 * @param int    $id    Post ID or post object.
 * @param string $title Optional. Title to override the post's current title when generating the post name. Default null.
 * @param string $name  Optional. Name to override the post name. Default null.
 * @return array Array containing the sample permalink with placeholder for the post name, and the post name.
 */
function get_sample_permalink( $id, $title = null, $name = null ) {
	$post = get_post( $id );
	if ( ! $post ) {
		return array( '', '' );
	}

	$ptype = get_post_type_object( $post->post_type );

	$original_status = $post->post_status;
	$original_date   = $post->post_date;
	$original_name   = $post->post_name;

	// Hack: get_permalink() would return ugly permalink for drafts, so we will fake that our post is published.
	if ( in_array( $post->post_status, array( 'draft', 'pending', 'future' ) ) ) {
		$post->post_status = 'publish';
		$post->post_name   = sanitize_title( $post->post_name ? $post->post_name : $post->post_title, $post->ID );
	}

	// If the user wants to set a new name -- override the current one
	// Note: if empty name is supplied -- use the title instead, see #6072
	if ( ! is_null( $name ) ) {
		$post->post_name = sanitize_title( $name ? $name : $title, $post->ID );
	}

	$post->post_name = wp_unique_post_slug( $post->post_name, $post->ID, $post->post_status, $post->post_type, $post->post_parent );

	$post->filter = 'sample';

	$permalink = get_permalink( $post, true );

	// Replace custom post_type Token with generic pagename token for ease of use.
	$permalink = str_replace( "%$post->post_type%", '%pagename%', $permalink );

	// Handle page hierarchy
	if ( $ptype->hierarchical ) {
		$uri = get_page_uri( $post );
		if ( $uri ) {
			$uri = untrailingslashit( $uri );
			$uri = strrev( stristr( strrev( $uri ), '/' ) );
			$uri = untrailingslashit( $uri );
		}

		/** This filter is documented in wp-admin/edit-tag-form.php */
		$uri = apply_filters( 'editable_slug', $uri, $post );
		if ( ! empty( $uri ) ) {
			$uri .= '/';
		}
		$permalink = str_replace( '%pagename%', "{$uri}%pagename%", $permalink );
	}

	/** This filter is documented in wp-admin/edit-tag-form.php */
	$permalink         = array( $permalink, apply_filters( 'editable_slug', $post->post_name, $post ) );
	$post->post_status = $original_status;
	$post->post_date   = $original_date;
	$post->post_name   = $original_name;
	unset( $post->filter );

	/**
	 * Filters the sample permalink.
	 *
	 * @since 4.4.0
	 *
	 * @param array   $permalink Array containing the sample permalink with placeholder for the post name, and the post name.
	 * @param int     $post_id   Post ID.
	 * @param string  $title     Post title.
	 * @param string  $name      Post name (slug).
	 * @param WP_Post $post      Post object.
	 */
	return apply_filters( 'get_sample_permalink', $permalink, $post->ID, $title, $name, $post );
}

/**
 * Returns the HTML of the sample permalink slug editor.
 *
 * @since 2.5.0
 *
 * @param int    $id        Post ID or post object.
 * @param string $new_title Optional. New title. Default null.
 * @param string $new_slug  Optional. New slug. Default null.
 * @return string The HTML of the sample permalink slug editor.
 */
function get_sample_permalink_html( $id, $new_title = null, $new_slug = null ) {
	$post = get_post( $id );
	if ( ! $post ) {
		return '';
	}

	list($permalink, $post_name) = get_sample_permalink( $post->ID, $new_title, $new_slug );

	$view_link      = false;
	$preview_target = '';

	if ( current_user_can( 'read_post', $post->ID ) ) {
		if ( 'draft' === $post->post_status || empty( $post->post_name ) ) {
			$view_link      = get_preview_post_link( $post );
			$preview_target = " target='wp-preview-{$post->ID}'";
		} else {
			if ( 'publish' === $post->post_status || 'attachment' === $post->post_type ) {
				$view_link = get_permalink( $post );
			} else {
				// Allow non-published (private, future) to be viewed at a pretty permalink, in case $post->post_name is set
				$view_link = str_replace( array( '%pagename%', '%postname%' ), $post->post_name, $permalink );
			}
		}
	}

	// Permalinks without a post/page name placeholder don't have anything to edit
	if ( false === strpos( $permalink, '%postname%' ) && false === strpos( $permalink, '%pagename%' ) ) {
		$return = '<strong>' . __( 'Permalink:' ) . "</strong>\n";

		if ( false !== $view_link ) {
			$display_link = urldecode( $view_link );
			$return      .= '<a id="sample-permalink" href="' . esc_url( $view_link ) . '"' . $preview_target . '>' . esc_html( $display_link ) . "</a>\n";
		} else {
			$return .= '<span id="sample-permalink">' . $permalink . "</span>\n";
		}

		// Encourage a pretty permalink setting
		if ( '' == get_option( 'permalink_structure' ) && current_user_can( 'manage_options' ) && ! ( 'page' == get_option( 'show_on_front' ) && $id == get_option( 'page_on_front' ) ) ) {
			$return .= '<span id="change-permalinks"><a href="options-permalink.php" class="button button-small" target="_blank">' . __( 'Change Permalinks' ) . "</a></span>\n";
		}
	} else {
		if ( mb_strlen( $post_name ) > 34 ) {
			$post_name_abridged = mb_substr( $post_name, 0, 16 ) . '&hellip;' . mb_substr( $post_name, -16 );
		} else {
			$post_name_abridged = $post_name;
		}

		$post_name_html = '<span id="editable-post-name">' . esc_html( $post_name_abridged ) . '</span>';
		$display_link   = str_replace( array( '%pagename%', '%postname%' ), $post_name_html, esc_html( urldecode( $permalink ) ) );

		$return  = '<strong>' . __( 'Permalink:' ) . "</strong>\n";
		$return .= '<span id="sample-permalink"><a href="' . esc_url( $view_link ) . '"' . $preview_target . '>' . $display_link . "</a></span>\n";
		$return .= '&lrm;'; // Fix bi-directional text display defect in RTL languages.
		$return .= '<span id="edit-slug-buttons"><button type="button" class="edit-slug button button-small hide-if-no-js" aria-label="' . __( 'Edit permalink' ) . '">' . __( 'Edit' ) . "</button></span>\n";
		$return .= '<span id="editable-post-name-full">' . esc_html( $post_name ) . "</span>\n";
	}

	/**
	 * Filters the sample permalink HTML markup.
	 *
	 * @since 2.9.0
	 * @since 4.4.0 Added `$post` parameter.
	 *
	 * @param string  $return    Sample permalink HTML markup.
	 * @param int     $post_id   Post ID.
	 * @param string  $new_title New sample permalink title.
	 * @param string  $new_slug  New sample permalink slug.
	 * @param WP_Post $post      Post object.
	 */
	$return = apply_filters( 'get_sample_permalink_html', $return, $post->ID, $new_title, $new_slug, $post );

	return $return;
}

/**
 * Output HTML for the post thumbnail meta-box.
 *
 * @since 2.9.0
 *
 * @param int $thumbnail_id ID of the attachment used for thumbnail
 * @param mixed $post The post ID or object associated with the thumbnail, defaults to global $post.
 * @return string html
 */
function _wp_post_thumbnail_html( $thumbnail_id = null, $post = null ) {
	$_wp_additional_image_sizes = wp_get_additional_image_sizes();

	$post               = get_post( $post );
	$post_type_object   = get_post_type_object( $post->post_type );
	$set_thumbnail_link = '<p class="hide-if-no-js"><a href="%s" id="set-post-thumbnail"%s class="thickbox">%s</a></p>';
	$upload_iframe_src  = get_upload_iframe_src( 'image', $post->ID );

	$content = sprintf(
		$set_thumbnail_link,
		esc_url( $upload_iframe_src ),
		'', // Empty when there's no featured image set, `aria-describedby` attribute otherwise.
		esc_html( $post_type_object->labels->set_featured_image )
	);

	if ( $thumbnail_id && get_post( $thumbnail_id ) ) {
		$size = isset( $_wp_additional_image_sizes['post-thumbnail'] ) ? 'post-thumbnail' : array( 266, 266 );

		/**
		 * Filters the size used to display the post thumbnail image in the 'Featured Image' meta box.
		 *
		 * Note: When a theme adds 'post-thumbnail' support, a special 'post-thumbnail'
		 * image size is registered, which differs from the 'thumbnail' image size
		 * managed via the Settings > Media screen. See the `$size` parameter description
		 * for more information on default values.
		 *
		 * @since 4.4.0
		 *
		 * @param string|array $size         Post thumbnail image size to display in the meta box. Accepts any valid
		 *                                   image size, or an array of width and height values in pixels (in that order).
		 *                                   If the 'post-thumbnail' size is set, default is 'post-thumbnail'. Otherwise,
		 *                                   default is an array with 266 as both the height and width values.
		 * @param int          $thumbnail_id Post thumbnail attachment ID.
		 * @param WP_Post      $post         The post object associated with the thumbnail.
		 */
		$size = apply_filters( 'admin_post_thumbnail_size', $size, $thumbnail_id, $post );

		$thumbnail_html = wp_get_attachment_image( $thumbnail_id, $size );

		if ( ! empty( $thumbnail_html ) ) {
			$content  = sprintf(
				$set_thumbnail_link,
				esc_url( $upload_iframe_src ),
				' aria-describedby="set-post-thumbnail-desc"',
				$thumbnail_html
			);
			$content .= '<p class="hide-if-no-js howto" id="set-post-thumbnail-desc">' . __( 'Click the image to edit or update' ) . '</p>';
			$content .= '<p class="hide-if-no-js"><a href="#" id="remove-post-thumbnail">' . esc_html( $post_type_object->labels->remove_featured_image ) . '</a></p>';
		}
	}

	$content .= '<input type="hidden" id="_thumbnail_id" name="_thumbnail_id" value="' . esc_attr( $thumbnail_id ? $thumbnail_id : '-1' ) . '" />';

	/**
	 * Filters the admin post thumbnail HTML markup to return.
	 *
	 * @since 2.9.0
	 * @since 3.5.0 Added the `$post_id` parameter.
	 * @since 4.6.0 Added the `$thumbnail_id` parameter.
	 *
	 * @param string   $content      Admin post thumbnail HTML markup.
	 * @param int      $post_id      Post ID.
	 * @param int|null $thumbnail_id Thumbnail attachment ID, or null if there isn't one.
	 */
	return apply_filters( 'admin_post_thumbnail_html', $content, $post->ID, $thumbnail_id );
}

/**
 * Check to see if the post is currently being edited by another user.
 *
 * @since 2.5.0
 *
 * @param int $post_id ID of the post to check for editing.
 * @return int|false ID of the user with lock. False if the post does not exist, post is not locked,
 *                   the user with lock does not exist, or the post is locked by current user.
 */
function wp_check_post_lock( $post_id ) {
	if ( ! $post = get_post( $post_id ) ) {
		return false;
	}

	if ( ! $lock = get_post_meta( $post->ID, '_edit_lock', true ) ) {
		return false;
	}

	$lock = explode( ':', $lock );
	$time = $lock[0];
	$user = isset( $lock[1] ) ? $lock[1] : get_post_meta( $post->ID, '_edit_last', true );

	if ( ! get_userdata( $user ) ) {
		return false;
	}

	/** This filter is documented in wp-admin/includes/ajax-actions.php */
	$time_window = apply_filters( 'wp_check_post_lock_window', 150 );

	if ( $time && $time > time() - $time_window && $user != get_current_user_id() ) {
		return $user;
	}

	return false;
}

/**
 * Mark the post as currently being edited by the current user
 *
 * @since 2.5.0
 *
 * @param int $post_id ID of the post being edited.
 * @return array|false Array of the lock time and user ID. False if the post does not exist, or
 *                     there is no current user.
 */
function wp_set_post_lock( $post_id ) {
	if ( ! $post = get_post( $post_id ) ) {
		return false;
	}

	if ( 0 == ( $user_id = get_current_user_id() ) ) {
		return false;
	}

	$now  = time();
	$lock = "$now:$user_id";

	update_post_meta( $post->ID, '_edit_lock', $lock );

	return array( $now, $user_id );
}

/**
 * Outputs the HTML for the notice to say that someone else is editing or has taken over editing of this post.
 *
 * @since 2.8.5
 * @return none
 */
function _admin_notice_post_locked() {
	if ( ! $post = get_post() ) {
		return;
	}

	$user = null;
	if ( $user_id = wp_check_post_lock( $post->ID ) ) {
		$user = get_userdata( $user_id );
	}

	if ( $user ) {

		/**
		 * Filters whether to show the post locked dialog.
		 *
		 * Returning a falsey value to the filter will short-circuit displaying the dialog.
		 *
		 * @since 3.6.0
		 *
		 * @param bool         $display Whether to display the dialog. Default true.
		 * @param WP_Post      $post    Post object.
		 * @param WP_User|bool $user    WP_User object on success, false otherwise.
		 */
		if ( ! apply_filters( 'show_post_locked_dialog', true, $post, $user ) ) {
			return;
		}

		$locked = true;
	} else {
		$locked = false;
	}

	if ( $locked && ( $sendback = wp_get_referer() ) &&
		false === strpos( $sendback, 'post.php' ) && false === strpos( $sendback, 'post-new.php' ) ) {

		$sendback_text = __( 'Go back' );
	} else {
		$sendback = admin_url( 'edit.php' );

		if ( 'post' != $post->post_type ) {
			$sendback = add_query_arg( 'post_type', $post->post_type, $sendback );
		}

		$sendback_text = get_post_type_object( $post->post_type )->labels->all_items;
	}

	$hidden = $locked ? '' : ' hidden';

	?>
	<div id="post-lock-dialog" class="notification-dialog-wrap<?php echo $hidden; ?>">
	<div class="notification-dialog-background"></div>
	<div class="notification-dialog">
	<?php

	if ( $locked ) {
		$query_args = array();
		if ( get_post_type_object( $post->post_type )->public ) {
			if ( 'publish' == $post->post_status || $user->ID != $post->post_author ) {
				// Latest content is in autosave
				$nonce                       = wp_create_nonce( 'post_preview_' . $post->ID );
				$query_args['preview_id']    = $post->ID;
				$query_args['preview_nonce'] = $nonce;
			}
		}

		$preview_link = get_preview_post_link( $post->ID, $query_args );

		/**
		 * Filters whether to allow the post lock to be overridden.
		 *
		 * Returning a falsey value to the filter will disable the ability
		 * to override the post lock.
		 *
		 * @since 3.6.0
		 *
		 * @param bool    $override Whether to allow overriding post locks. Default true.
		 * @param WP_Post $post     Post object.
		 * @param WP_User $user     User object.
		 */
		$override = apply_filters( 'override_post_lock', true, $post, $user );
		$tab_last = $override ? '' : ' wp-tab-last';

		?>
		<div class="post-locked-message">
		<div class="post-locked-avatar"><?php echo get_avatar( $user->ID, 64 ); ?></div>
		<p class="currently-editing wp-tab-first" tabindex="0">
		<?php
		if ( $override ) {
			/* translators: %s: user's display name */
			printf( __( '%s is already editing this post. Do you want to take over?' ), esc_html( $user->display_name ) );
		} else {
			/* translators: %s: user's display name */
			printf( __( '%s is already editing this post.' ), esc_html( $user->display_name ) );
		}
		?>
		</p>
		<?php
		/**
		 * Fires inside the post locked dialog before the buttons are displayed.
		 *
		 * @since 3.6.0
		 *
		 * @param WP_Post $post Post object.
		 */
		do_action( 'post_locked_dialog', $post );
		?>
		<p>
		<a class="button" href="<?php echo esc_url( $sendback ); ?>"><?php echo $sendback_text; ?></a>
		<?php if ( $preview_link ) { ?>
		<a class="button<?php echo $tab_last; ?>" href="<?php echo esc_url( $preview_link ); ?>"><?php _e( 'Preview' ); ?></a>
			<?php
		}

		// Allow plugins to prevent some users overriding the post lock
		if ( $override ) {
			?>
	<a class="button button-primary wp-tab-last" href="<?php echo esc_url( add_query_arg( 'get-post-lock', '1', wp_nonce_url( get_edit_post_link( $post->ID, 'url' ), 'lock-post_' . $post->ID ) ) ); ?>"><?php _e( 'Take over' ); ?></a>
			<?php
		}

		?>
		</p>
		</div>
		<?php
	} else {
		?>
		<div class="post-taken-over">
			<div class="post-locked-avatar"></div>
			<p class="wp-tab-first" tabindex="0">
			<span class="currently-editing"></span><br />
			<span class="locked-saving hidden"><img src="<?php echo esc_url( admin_url( 'images/spinner-2x.gif' ) ); ?>" width="16" height="16" alt="" /> <?php _e( 'Saving revision&hellip;' ); ?></span>
			<span class="locked-saved hidden"><?php _e( 'Your latest changes were saved as a revision.' ); ?></span>
			</p>
			<?php
			/**
			 * Fires inside the dialog displayed when a user has lost the post lock.
			 *
			 * @since 3.6.0
			 *
			 * @param WP_Post $post Post object.
			 */
			do_action( 'post_lock_lost_dialog', $post );
			?>
			<p><a class="button button-primary wp-tab-last" href="<?php echo esc_url( $sendback ); ?>"><?php echo $sendback_text; ?></a></p>
		</div>
		<?php
	}

	?>
	</div>
	</div>
	<?php
}

/**
 * Creates autosave data for the specified post from $_POST data.
 *
 * @since 2.6.0
 *
 * @param mixed $post_data Associative array containing the post data or int post ID.
 * @return mixed The autosave revision ID. WP_Error or 0 on error.
 */
function wp_create_post_autosave( $post_data ) {
	if ( is_numeric( $post_data ) ) {
		$post_id   = $post_data;
		$post_data = $_POST;
	} else {
		$post_id = (int) $post_data['post_ID'];
	}

	$post_data = _wp_translate_postdata( true, $post_data );
	if ( is_wp_error( $post_data ) ) {
		return $post_data;
	}
	$post_data = _wp_get_allowed_postdata( $post_data );

	$post_author = get_current_user_id();

	// Store one autosave per author. If there is already an autosave, overwrite it.
	if ( $old_autosave = wp_get_post_autosave( $post_id, $post_author ) ) {
		$new_autosave                = _wp_post_revision_data( $post_data, true );
		$new_autosave['ID']          = $old_autosave->ID;
		$new_autosave['post_author'] = $post_author;

		// If the new autosave has the same content as the post, delete the autosave.
		$post                  = get_post( $post_id );
		$autosave_is_different = false;
		foreach ( array_intersect( array_keys( $new_autosave ), array_keys( _wp_post_revision_fields( $post ) ) ) as $field ) {
			if ( normalize_whitespace( $new_autosave[ $field ] ) != normalize_whitespace( $post->$field ) ) {
				$autosave_is_different = true;
				break;
			}
		}

		if ( ! $autosave_is_different ) {
			wp_delete_post_revision( $old_autosave->ID );
			return 0;
		}

		/**
		 * Fires before an autosave is stored.
		 *
		 * @since 4.1.0
		 *
		 * @param array $new_autosave Post array - the autosave that is about to be saved.
		 */
		do_action( 'wp_creating_autosave', $new_autosave );

		return wp_update_post( $new_autosave );
	}

	// _wp_put_post_revision() expects unescaped.
	$post_data = wp_unslash( $post_data );

	// Otherwise create the new autosave as a special post revision
	return _wp_put_post_revision( $post_data, true );
}

/**
 * Saves a draft or manually autosaves for the purpose of showing a post preview.
 *
 * @since 2.7.0
 *
 * @return string URL to redirect to show the preview.
 */
function post_preview() {

	$post_ID     = (int) $_POST['post_ID'];
	$_POST['ID'] = $post_ID;

	if ( ! $post = get_post( $post_ID ) ) {
		wp_die( __( 'Sorry, you are not allowed to edit this post.' ) );
	}

	if ( ! current_user_can( 'edit_post', $post->ID ) ) {
		wp_die( __( 'Sorry, you are not allowed to edit this post.' ) );
	}

	$is_autosave = false;

	if ( ! wp_check_post_lock( $post->ID ) && get_current_user_id() == $post->post_author && ( 'draft' == $post->post_status || 'auto-draft' == $post->post_status ) ) {
		$saved_post_id = edit_post();
	} else {
		$is_autosave = true;

		if ( isset( $_POST['post_status'] ) && 'auto-draft' == $_POST['post_status'] ) {
			$_POST['post_status'] = 'draft';
		}

		$saved_post_id = wp_create_post_autosave( $post->ID );
	}

	if ( is_wp_error( $saved_post_id ) ) {
		wp_die( $saved_post_id->get_error_message() );
	}

	$query_args = array();

	if ( $is_autosave && $saved_post_id ) {
		$query_args['preview_id']    = $post->ID;
		$query_args['preview_nonce'] = wp_create_nonce( 'post_preview_' . $post->ID );

		if ( isset( $_POST['post_format'] ) ) {
			$query_args['post_format'] = empty( $_POST['post_format'] ) ? 'standard' : sanitize_key( $_POST['post_format'] );
		}

		if ( isset( $_POST['_thumbnail_id'] ) ) {
			$query_args['_thumbnail_id'] = ( intval( $_POST['_thumbnail_id'] ) <= 0 ) ? '-1' : intval( $_POST['_thumbnail_id'] );
		}
	}

	return get_preview_post_link( $post, $query_args );
}

/**
 * Save a post submitted with XHR
 *
 * Intended for use with heartbeat and autosave.js
 *
 * @since 3.9.0
 *
 * @param array $post_data Associative array of the submitted post data.
 * @return mixed The value 0 or WP_Error on failure. The saved post ID on success.
 *               The ID can be the draft post_id or the autosave revision post_id.
 */
function wp_autosave( $post_data ) {
	// Back-compat
	if ( ! defined( 'DOING_AUTOSAVE' ) ) {
		define( 'DOING_AUTOSAVE', true );
	}

	$post_id         = (int) $post_data['post_id'];
	$post_data['ID'] = $post_data['post_ID'] = $post_id;

	if ( false === wp_verify_nonce( $post_data['_wpnonce'], 'update-post_' . $post_id ) ) {
		return new WP_Error( 'invalid_nonce', __( 'Error while saving.' ) );
	}

	$post = get_post( $post_id );

	if ( ! current_user_can( 'edit_post', $post->ID ) ) {
		return new WP_Error( 'edit_posts', __( 'Sorry, you are not allowed to edit this item.' ) );
	}

	if ( 'auto-draft' == $post->post_status ) {
		$post_data['post_status'] = 'draft';
	}

	if ( $post_data['post_type'] != 'page' && ! empty( $post_data['catslist'] ) ) {
		$post_data['post_category'] = explode( ',', $post_data['catslist'] );
	}

	if ( ! wp_check_post_lock( $post->ID ) && get_current_user_id() == $post->post_author && ( 'auto-draft' == $post->post_status || 'draft' == $post->post_status ) ) {
		// Drafts and auto-drafts are just overwritten by autosave for the same user if the post is not locked
		return edit_post( wp_slash( $post_data ) );
	} else {
		// Non drafts or other users drafts are not overwritten. The autosave is stored in a special post revision for each user.
		return wp_create_post_autosave( wp_slash( $post_data ) );
	}
}

/**
 * Redirect to previous page.
 *
 * @param int $post_id Optional. Post ID.
 */
function redirect_post( $post_id = '' ) {
	if ( isset( $_POST['save'] ) || isset( $_POST['publish'] ) ) {
		$status = get_post_status( $post_id );

		if ( isset( $_POST['publish'] ) ) {
			switch ( $status ) {
				case 'pending':
					$message = 8;
					break;
				case 'future':
					$message = 9;
					break;
				default:
					$message = 6;
			}
		} else {
			$message = 'draft' == $status ? 10 : 1;
		}

		$location = add_query_arg( 'message', $message, get_edit_post_link( $post_id, 'url' ) );
	} elseif ( isset( $_POST['addmeta'] ) && $_POST['addmeta'] ) {
		$location = add_query_arg( 'message', 2, wp_get_referer() );
		$location = explode( '#', $location );
		$location = $location[0] . '#postcustom';
	} elseif ( isset( $_POST['deletemeta'] ) && $_POST['deletemeta'] ) {
		$location = add_query_arg( 'message', 3, wp_get_referer() );
		$location = explode( '#', $location );
		$location = $location[0] . '#postcustom';
	} else {
		$location = add_query_arg( 'message', 4, get_edit_post_link( $post_id, 'url' ) );
	}

	/**
	 * Filters the post redirect destination URL.
	 *
	 * @since 2.9.0
	 *
	 * @param string $location The destination URL.
	 * @param int    $post_id  The post ID.
	 */
	wp_redirect( apply_filters( 'redirect_post_location', $location, $post_id ) );
	exit;
}

/**
 * Sanitizes POST values from a checkbox taxonomy metabox.
 *
 * @since 5.1.0
 *
 * @param mixed $terms Raw term data from the 'tax_input' field.
 * @return array
 */
function taxonomy_meta_box_sanitize_cb_checkboxes( $taxonomy, $terms ) {
	return array_map( 'intval', $terms );
}

/**
 * Sanitizes POST values from an input taxonomy metabox.
 *
 * @since 5.1.0
 *
 * @param mixed $terms Raw term data from the 'tax_input' field.
 * @return array
 */
function taxonomy_meta_box_sanitize_cb_input( $taxonomy, $terms ) {
	/*
	 * Assume that a 'tax_input' string is a comma-separated list of term names.
	 * Some languages may use a character other than a comma as a delimiter, so we standardize on
	 * commas before parsing the list.
	 */
	if ( ! is_array( $terms ) ) {
		$comma = _x( ',', 'tag delimiter' );
		if ( ',' !== $comma ) {
			$terms = str_replace( $comma, ',', $terms );
		}
		$terms = explode( ',', trim( $terms, " \n\t\r\0\x0B," ) );
	}

	$clean_terms = array();
	foreach ( $terms as $term ) {
		// Empty terms are invalid input.
		if ( empty( $term ) ) {
			continue;
		}

		$_term = get_terms(
			$taxonomy,
			array(
				'name'       => $term,
				'fields'     => 'ids',
				'hide_empty' => false,
			)
		);

		if ( ! empty( $_term ) ) {
			$clean_terms[] = intval( $_term[0] );
		} else {
			// No existing term was found, so pass the string. A new term will be created.
			$clean_terms[] = $term;
		}
	}

	return $clean_terms;
}

/**
 * Return whether the post can be edited in the block editor.
 *
 * @since 5.0.0
 *
 * @param int|WP_Post $post Post ID or WP_Post object.
 * @return bool Whether the post can be edited in the block editor.
 */
function use_block_editor_for_post( $post ) {
	$post = get_post( $post );

	if ( ! $post ) {
		return false;
	}

	// We're in the meta box loader, so don't use the block editor.
	if ( isset( $_GET['meta-box-loader'] ) ) {
		check_admin_referer( 'meta-box-loader', 'meta-box-loader-nonce' );
		return false;
	}

	// The posts page can't be edited in the block editor.
	if ( absint( get_option( 'page_for_posts' ) ) === $post->ID && empty( $post->post_content ) ) {
		return false;
	}

	$use_block_editor = use_block_editor_for_post_type( $post->post_type );

	/**
	 * Filter whether a post is able to be edited in the block editor.
	 *
	 * @since 5.0.0
	 *
	 * @param bool    $use_block_editor Whether the post can be edited or not.
	 * @param WP_Post $post             The post being checked.
	 */
	return apply_filters( 'use_block_editor_for_post', $use_block_editor, $post );
}

/**
 * Return whether a post type is compatible with the block editor.
 *
 * The block editor depends on the REST API, and if the post type is not shown in the
 * REST API, then it won't work with the block editor.
 *
 * @since 5.0.0
 *
 * @param string $post_type The post type.
 * @return bool Whether the post type can be edited with the block editor.
 */
function use_block_editor_for_post_type( $post_type ) {
	if ( ! post_type_exists( $post_type ) ) {
		return false;
	}

	if ( ! post_type_supports( $post_type, 'editor' ) ) {
		return false;
	}

	$post_type_object = get_post_type_object( $post_type );
	if ( $post_type_object && ! $post_type_object->show_in_rest ) {
		return false;
	}

	/**
	 * Filter whether a post is able to be edited in the block editor.
	 *
	 * @since 5.0.0
	 *
	 * @param bool   $use_block_editor  Whether the post type can be edited or not. Default true.
	 * @param string $post_type         The post type being checked.
	 */
	return apply_filters( 'use_block_editor_for_post_type', true, $post_type );
}

/**
 * Returns all the block categories that will be shown in the block editor.
 *
 * @since 5.0.0
 *
 * @param WP_Post $post Post object.
 * @return array Array of block categories.
 */
function get_block_categories( $post ) {
	$default_categories = array(
		array(
			'slug'  => 'common',
			'title' => __( 'Common Blocks' ),
			'icon'  => null,
		),
		array(
			'slug'  => 'formatting',
			'title' => __( 'Formatting' ),
			'icon'  => null,
		),
		array(
			'slug'  => 'layout',
			'title' => __( 'Layout Elements' ),
			'icon'  => null,
		),
		array(
			'slug'  => 'widgets',
			'title' => __( 'Widgets' ),
			'icon'  => null,
		),
		array(
			'slug'  => 'embed',
			'title' => __( 'Embeds' ),
			'icon'  => null,
		),
		array(
			'slug'  => 'reusable',
			'title' => __( 'Reusable Blocks' ),
			'icon'  => null,
		),
	);

	/**
	 * Filter the default array of block categories.
	 *
	 * @since 5.0.0
	 *
	 * @param array   $default_categories Array of block categories.
	 * @param WP_Post $post               Post being loaded.
	 */
	return apply_filters( 'block_categories', $default_categories, $post );
}

/**
 * Prepares server-registered blocks for the block editor.
 *
 * Returns an associative array of registered block data keyed by block name. Data includes properties
 * of a block relevant for client registration.
 *
 * @since 5.0.0
 *
 * @return array An associative array of registered block data.
 */
function get_block_editor_server_block_settings() {
	$block_registry = WP_Block_Type_Registry::get_instance();
	$blocks         = array();
	$keys_to_pick   = array( 'title', 'description', 'icon', 'category', 'keywords', 'supports', 'attributes' );

	foreach ( $block_registry->get_all_registered() as $block_name => $block_type ) {
		foreach ( $keys_to_pick as $key ) {
			if ( ! isset( $block_type->{ $key } ) ) {
				continue;
			}

			if ( ! isset( $blocks[ $block_name ] ) ) {
				$blocks[ $block_name ] = array();
			}

			$blocks[ $block_name ][ $key ] = $block_type->{ $key };
		}
	}

	return $blocks;
}

/**
 * Renders the meta boxes forms.
 *
 * @since 5.0.0
 */
function the_block_editor_meta_boxes() {
	global $post, $current_screen, $wp_meta_boxes;

	// Handle meta box state.
	$_original_meta_boxes = $wp_meta_boxes;

	/**
	 * Fires right before the meta boxes are rendered.
	 *
	 * This allows for the filtering of meta box data, that should already be
	 * present by this point. Do not use as a means of adding meta box data.
	 *
	 * @since 5.0.0
	 *
	 * @param array $wp_meta_boxes Global meta box state.
	 */
	$wp_meta_boxes = apply_filters( 'filter_block_editor_meta_boxes', $wp_meta_boxes );
	$locations     = array( 'side', 'normal', 'advanced' );
	$priorities    = array( 'high', 'sorted', 'core', 'default', 'low' );

	// Render meta boxes.
	?>
	<form class="metabox-base-form">
	<?php the_block_editor_meta_box_post_form_hidden_fields( $post ); ?>
	</form>
	<form id="toggle-custom-fields-form" method="post" action="<?php echo esc_attr( admin_url( 'post.php' ) ); ?>">
		<?php wp_nonce_field( 'toggle-custom-fields' ); ?>
		<input type="hidden" name="action" value="toggle-custom-fields" />
	</form>
	<?php foreach ( $locations as $location ) : ?>
		<form class="metabox-location-<?php echo esc_attr( $location ); ?>" onsubmit="return false;">
			<div id="poststuff" class="sidebar-open">
				<div id="postbox-container-2" class="postbox-container">
					<?php
					do_meta_boxes(
						$current_screen,
						$location,
						$post
					);
					?>
				</div>
			</div>
		</form>
	<?php endforeach; ?>
	<?php

	$meta_boxes_per_location = array();
	foreach ( $locations as $location ) {
		$meta_boxes_per_location[ $location ] = array();

		if ( ! isset( $wp_meta_boxes[ $current_screen->id ][ $location ] ) ) {
			continue;
		}

		foreach ( $priorities as $priority ) {
			if ( ! isset( $wp_meta_boxes[ $current_screen->id ][ $location ][ $priority ] ) ) {
				continue;
			}

			$meta_boxes = (array) $wp_meta_boxes[ $current_screen->id ][ $location ][ $priority ];
			foreach ( $meta_boxes as $meta_box ) {
				if ( false == $meta_box || ! $meta_box['title'] ) {
					continue;
				}

				// If a meta box is just here for back compat, don't show it in the block editor.
				if ( isset( $meta_box['args']['__back_compat_meta_box'] ) && $meta_box['args']['__back_compat_meta_box'] ) {
					continue;
				}

				$meta_boxes_per_location[ $location ][] = array(
					'id'    => $meta_box['id'],
					'title' => $meta_box['title'],
				);
			}
		}
	}

	/**
	 * Sadly we probably can not add this data directly into editor settings.
	 *
	 * Some meta boxes need admin_head to fire for meta box registry.
	 * admin_head fires after admin_enqueue_scripts, which is where we create our
	 * editor instance.
	 */
	$script = 'window._wpLoadBlockEditor.then( function() {
		wp.data.dispatch( \'core/edit-post\' ).setAvailableMetaBoxesPerLocation( ' . wp_json_encode( $meta_boxes_per_location ) . ' );
	} );';

	wp_add_inline_script( 'wp-edit-post', $script );

	/**
	 * When `wp-edit-post` is output in the `<head>`, the inline script needs to be manually printed. Otherwise,
	 * meta boxes will not display because inline scripts for `wp-edit-post` will not be printed again after this point.
	 */
	if ( wp_script_is( 'wp-edit-post', 'done' ) ) {
		printf( "<script type='text/javascript'>\n%s\n</script>\n", trim( $script ) );
	}

	/**
	 * If the 'postcustom' meta box is enabled, then we need to perform some
	 * extra initialization on it.
	 */
	$enable_custom_fields = (bool) get_user_meta( get_current_user_id(), 'enable_custom_fields', true );
	if ( $enable_custom_fields ) {
		$script = "( function( $ ) {
			if ( $('#postcustom').length ) {
				$( '#the-list' ).wpList( {
					addBefore: function( s ) {
						s.data += '&post_id=$post->ID';
						return s;
					},
					addAfter: function() {
						$('table#list-table').show();
					}
				});
			}
		} )( jQuery );";
		wp_enqueue_script( 'wp-lists' );
		wp_add_inline_script( 'wp-lists', $script );
	}

	// Reset meta box data.
	$wp_meta_boxes = $_original_meta_boxes;
}

/**
 * Renders the hidden form required for the meta boxes form.
 *
 * @since 5.0.0
 *
 * @param WP_Post $post Current post object.
 */
function the_block_editor_meta_box_post_form_hidden_fields( $post ) {
	$form_extra = '';
	if ( 'auto-draft' === $post->post_status ) {
		$form_extra .= "<input type='hidden' id='auto_draft' name='auto_draft' value='1' />";
	}
	$form_action  = 'editpost';
	$nonce_action = 'update-post_' . $post->ID;
	$form_extra  .= "<input type='hidden' id='post_ID' name='post_ID' value='" . esc_attr( $post->ID ) . "' />";
	$referer      = wp_get_referer();
	$current_user = wp_get_current_user();
	$user_id      = $current_user->ID;
	wp_nonce_field( $nonce_action );

	/*
	 * Some meta boxes hook into these actions to add hidden input fields in the classic post form. For backwards
	 * compatibility, we can capture the output from these actions, and extract the hidden input fields.
	 */
	ob_start();
	/** This filter is documented in wp-admin/edit-form-advanced.php */
	do_action( 'edit_form_after_title', $post );
	/** This filter is documented in wp-admin/edit-form-advanced.php */
	do_action( 'edit_form_advanced', $post );
	$classic_output = ob_get_clean();

	$classic_elements = wp_html_split( $classic_output );
	$hidden_inputs    = '';
	foreach ( $classic_elements as $element ) {
		if ( 0 !== strpos( $element, '<input ' ) ) {
			continue;
		}

		if ( preg_match( '/\stype=[\'"]hidden[\'"]\s/', $element ) ) {
			echo $element;
		}
	}
	?>
	<input type="hidden" id="user-id" name="user_ID" value="<?php echo (int) $user_id; ?>" />
	<input type="hidden" id="hiddenaction" name="action" value="<?php echo esc_attr( $form_action ); ?>" />
	<input type="hidden" id="originalaction" name="originalaction" value="<?php echo esc_attr( $form_action ); ?>" />
	<input type="hidden" id="post_type" name="post_type" value="<?php echo esc_attr( $post->post_type ); ?>" />
	<input type="hidden" id="original_post_status" name="original_post_status" value="<?php echo esc_attr( $post->post_status ); ?>" />
	<input type="hidden" id="referredby" name="referredby" value="<?php echo $referer ? esc_url( $referer ) : ''; ?>" />

	<?php
	if ( 'draft' !== get_post_status( $post ) ) {
		wp_original_referer_field( true, 'previous' );
	}
	echo $form_extra;
	wp_nonce_field( 'meta-box-order', 'meta-box-order-nonce', false );
	wp_nonce_field( 'closedpostboxes', 'closedpostboxesnonce', false );
	// Permalink title nonce.
	wp_nonce_field( 'samplepermalink', 'samplepermalinknonce', false );

	/**
	 * Add hidden input fields to the meta box save form.
	 *
	 * Hook into this action to print `<input type="hidden" ... />` fields, which will be POSTed back to
	 * the server when meta boxes are saved.
	 *
	 * @since 5.0.0
	 *
	 * @params WP_Post $post The post that is being edited.
	 */
	do_action( 'block_editor_meta_box_hidden_fields', $post );
}
home/xbodynamge/crosstraining/wp-admin/includes/post.php000064400000214374151130654240017552 0ustar00<?php
/**
 * WordPress Post Administration API.
 *
 * @package WordPress
 * @subpackage Administration
 */

/**
 * Rename $_POST data from form names to DB post columns.
 *
 * Manipulates $_POST directly.
 *
 * @since 2.6.0
 *
 * @param bool $update Are we updating a pre-existing post?
 * @param array $post_data Array of post data. Defaults to the contents of $_POST.
 * @return object|bool WP_Error on failure, true on success.
 */
function _wp_translate_postdata( $update = false, $post_data = null ) {

	if ( empty($post_data) )
		$post_data = &$_POST;

	if ( $update )
		$post_data['ID'] = (int) $post_data['post_ID'];

	$ptype = get_post_type_object( $post_data['post_type'] );

	if ( $update && ! current_user_can( 'edit_post', $post_data['ID'] ) ) {
		if ( 'page' == $post_data['post_type'] )
			return new WP_Error( 'edit_others_pages', __( 'Sorry, you are not allowed to edit pages as this user.' ) );
		else
			return new WP_Error( 'edit_others_posts', __( 'Sorry, you are not allowed to edit posts as this user.' ) );
	} elseif ( ! $update && ! current_user_can( $ptype->cap->create_posts ) ) {
		if ( 'page' == $post_data['post_type'] )
			return new WP_Error( 'edit_others_pages', __( 'Sorry, you are not allowed to create pages as this user.' ) );
		else
			return new WP_Error( 'edit_others_posts', __( 'Sorry, you are not allowed to create posts as this user.' ) );
	}

	if ( isset( $post_data['content'] ) )
		$post_data['post_content'] = $post_data['content'];

	if ( isset( $post_data['excerpt'] ) )
		$post_data['post_excerpt'] = $post_data['excerpt'];

	if ( isset( $post_data['parent_id'] ) )
		$post_data['post_parent'] = (int) $post_data['parent_id'];

	if ( isset($post_data['trackback_url']) )
		$post_data['to_ping'] = $post_data['trackback_url'];

	$post_data['user_ID'] = get_current_user_id();

	if (!empty ( $post_data['post_author_override'] ) ) {
		$post_data['post_author'] = (int) $post_data['post_author_override'];
	} else {
		if (!empty ( $post_data['post_author'] ) ) {
			$post_data['post_author'] = (int) $post_data['post_author'];
		} else {
			$post_data['post_author'] = (int) $post_data['user_ID'];
		}
	}

	if ( isset( $post_data['user_ID'] ) && ( $post_data['post_author'] != $post_data['user_ID'] )
		 && ! current_user_can( $ptype->cap->edit_others_posts ) ) {
		if ( $update ) {
			if ( 'page' == $post_data['post_type'] )
				return new WP_Error( 'edit_others_pages', __( 'Sorry, you are not allowed to edit pages as this user.' ) );
			else
				return new WP_Error( 'edit_others_posts', __( 'Sorry, you are not allowed to edit posts as this user.' ) );
		} else {
			if ( 'page' == $post_data['post_type'] )
				return new WP_Error( 'edit_others_pages', __( 'Sorry, you are not allowed to create pages as this user.' ) );
			else
				return new WP_Error( 'edit_others_posts', __( 'Sorry, you are not allowed to create posts as this user.' ) );
		}
	}

	if ( ! empty( $post_data['post_status'] ) ) {
		$post_data['post_status'] = sanitize_key( $post_data['post_status'] );

		// No longer an auto-draft
		if ( 'auto-draft' === $post_data['post_status'] ) {
			$post_data['post_status'] = 'draft';
		}

		if ( ! get_post_status_object( $post_data['post_status'] ) ) {
			unset( $post_data['post_status'] );
		}
	}

	// What to do based on which button they pressed
	if ( isset($post_data['saveasdraft']) && '' != $post_data['saveasdraft'] )
		$post_data['post_status'] = 'draft';
	if ( isset($post_data['saveasprivate']) && '' != $post_data['saveasprivate'] )
		$post_data['post_status'] = 'private';
	if ( isset($post_data['publish']) && ( '' != $post_data['publish'] ) && ( !isset($post_data['post_status']) || $post_data['post_status'] != 'private' ) )
		$post_data['post_status'] = 'publish';
	if ( isset($post_data['advanced']) && '' != $post_data['advanced'] )
		$post_data['post_status'] = 'draft';
	if ( isset($post_data['pending']) && '' != $post_data['pending'] )
		$post_data['post_status'] = 'pending';

	if ( isset( $post_data['ID'] ) )
		$post_id = $post_data['ID'];
	else
		$post_id = false;
	$previous_status = $post_id ? get_post_field( 'post_status', $post_id ) : false;

	if ( isset( $post_data['post_status'] ) && 'private' == $post_data['post_status'] && ! current_user_can( $ptype->cap->publish_posts ) ) {
		$post_data['post_status'] = $previous_status ? $previous_status : 'pending';
	}

	$published_statuses = array( 'publish', 'future' );

	// Posts 'submitted for approval' present are submitted to $_POST the same as if they were being published.
	// Change status from 'publish' to 'pending' if user lacks permissions to publish or to resave published posts.
	if ( isset($post_data['post_status']) && (in_array( $post_data['post_status'], $published_statuses ) && !current_user_can( $ptype->cap->publish_posts )) )
		if ( ! in_array( $previous_status, $published_statuses ) || !current_user_can( 'edit_post', $post_id ) )
			$post_data['post_status'] = 'pending';

	if ( ! isset( $post_data['post_status'] ) ) {
		$post_data['post_status'] = 'auto-draft' === $previous_status ? 'draft' : $previous_status;
	}

	if ( isset( $post_data['post_password'] ) && ! current_user_can( $ptype->cap->publish_posts ) ) {
		unset( $post_data['post_password'] );
	}

	if (!isset( $post_data['comment_status'] ))
		$post_data['comment_status'] = 'closed';

	if (!isset( $post_data['ping_status'] ))
		$post_data['ping_status'] = 'closed';

	foreach ( array('aa', 'mm', 'jj', 'hh', 'mn') as $timeunit ) {
		if ( !empty( $post_data['hidden_' . $timeunit] ) && $post_data['hidden_' . $timeunit] != $post_data[$timeunit] ) {
			$post_data['edit_date'] = '1';
			break;
		}
	}

	if ( !empty( $post_data['edit_date'] ) ) {
		$aa = $post_data['aa'];
		$mm = $post_data['mm'];
		$jj = $post_data['jj'];
		$hh = $post_data['hh'];
		$mn = $post_data['mn'];
		$ss = $post_data['ss'];
		$aa = ($aa <= 0 ) ? date('Y') : $aa;
		$mm = ($mm <= 0 ) ? date('n') : $mm;
		$jj = ($jj > 31 ) ? 31 : $jj;
		$jj = ($jj <= 0 ) ? date('j') : $jj;
		$hh = ($hh > 23 ) ? $hh -24 : $hh;
		$mn = ($mn > 59 ) ? $mn -60 : $mn;
		$ss = ($ss > 59 ) ? $ss -60 : $ss;
		$post_data['post_date'] = sprintf( "%04d-%02d-%02d %02d:%02d:%02d", $aa, $mm, $jj, $hh, $mn, $ss );
		$valid_date = wp_checkdate( $mm, $jj, $aa, $post_data['post_date'] );
		if ( !$valid_date ) {
			return new WP_Error( 'invalid_date', __( 'Invalid date.' ) );
		}
		$post_data['post_date_gmt'] = get_gmt_from_date( $post_data['post_date'] );
	}

	if ( isset( $post_data['post_category'] ) ) {
		$category_object = get_taxonomy( 'category' );
		if ( ! current_user_can( $category_object->cap->assign_terms ) ) {
			unset( $post_data['post_category'] );
		}
	}

	return $post_data;
}

/**
 * Returns only allowed post data fields
 *
 * @since 4.9.9
 *
 * @param array $post_data Array of post data. Defaults to the contents of $_POST.
 * @return object|bool WP_Error on failure, true on success.
 */
function _wp_get_allowed_postdata( $post_data = null ) {
	if ( empty( $post_data ) ) {
		$post_data = $_POST;
	}

	// Pass through errors
	if ( is_wp_error( $post_data ) ) {
		return $post_data;
	}

	return array_diff_key( $post_data, array_flip( array( 'meta_input', 'file', 'guid' ) ) );
}

/**
 * Update an existing post with values provided in $_POST.
 *
 * @since 1.5.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param array $post_data Optional.
 * @return int Post ID.
 */
function edit_post( $post_data = null ) {
	global $wpdb;

	if ( empty($post_data) )
		$post_data = &$_POST;

	// Clear out any data in internal vars.
	unset( $post_data['filter'] );

	$post_ID = (int) $post_data['post_ID'];
	$post = get_post( $post_ID );
	$post_data['post_type'] = $post->post_type;
	$post_data['post_mime_type'] = $post->post_mime_type;

	if ( ! empty( $post_data['post_status'] ) ) {
		$post_data['post_status'] = sanitize_key( $post_data['post_status'] );

		if ( 'inherit' == $post_data['post_status'] ) {
			unset( $post_data['post_status'] );
		}
	}

	$ptype = get_post_type_object($post_data['post_type']);
	if ( !current_user_can( 'edit_post', $post_ID ) ) {
		if ( 'page' == $post_data['post_type'] )
			wp_die( __('Sorry, you are not allowed to edit this page.' ));
		else
			wp_die( __('Sorry, you are not allowed to edit this post.' ));
	}

	if ( post_type_supports( $ptype->name, 'revisions' ) ) {
		$revisions = wp_get_post_revisions( $post_ID, array( 'order' => 'ASC', 'posts_per_page' => 1 ) );
		$revision = current( $revisions );

		// Check if the revisions have been upgraded
		if ( $revisions && _wp_get_post_revision_version( $revision ) < 1 )
			_wp_upgrade_revisions_of_post( $post, wp_get_post_revisions( $post_ID ) );
	}

	if ( isset($post_data['visibility']) ) {
		switch ( $post_data['visibility'] ) {
			case 'public' :
				$post_data['post_password'] = '';
				break;
			case 'password' :
				unset( $post_data['sticky'] );
				break;
			case 'private' :
				$post_data['post_status'] = 'private';
				$post_data['post_password'] = '';
				unset( $post_data['sticky'] );
				break;
		}
	}

	$post_data = _wp_translate_postdata( true, $post_data );
	if ( is_wp_error($post_data) )
		wp_die( $post_data->get_error_message() );
	$translated = _wp_get_allowed_postdata( $post_data );

	// Post Formats
	if ( isset( $post_data['post_format'] ) )
		set_post_format( $post_ID, $post_data['post_format'] );

	$format_meta_urls = array( 'url', 'link_url', 'quote_source_url' );
	foreach ( $format_meta_urls as $format_meta_url ) {
		$keyed = '_format_' . $format_meta_url;
		if ( isset( $post_data[ $keyed ] ) )
			update_post_meta( $post_ID, $keyed, wp_slash( esc_url_raw( wp_unslash( $post_data[ $keyed ] ) ) ) );
	}

	$format_keys = array( 'quote', 'quote_source_name', 'image', 'gallery', 'audio_embed', 'video_embed' );

	foreach ( $format_keys as $key ) {
		$keyed = '_format_' . $key;
		if ( isset( $post_data[ $keyed ] ) ) {
			if ( current_user_can( 'unfiltered_html' ) )
				update_post_meta( $post_ID, $keyed, $post_data[ $keyed ] );
			else
				update_post_meta( $post_ID, $keyed, wp_filter_post_kses( $post_data[ $keyed ] ) );
		}
	}

	if ( 'attachment' === $post_data['post_type'] && preg_match( '#^(audio|video)/#', $post_data['post_mime_type'] ) ) {
		$id3data = wp_get_attachment_metadata( $post_ID );
		if ( ! is_array( $id3data ) ) {
			$id3data = array();
		}

		foreach ( wp_get_attachment_id3_keys( $post, 'edit' ) as $key => $label ) {
			if ( isset( $post_data[ 'id3_' . $key ] ) ) {
				$id3data[ $key ] = sanitize_text_field( wp_unslash( $post_data[ 'id3_' . $key ] ) );
			}
		}
		wp_update_attachment_metadata( $post_ID, $id3data );
	}

	// Meta Stuff
	if ( isset($post_data['meta']) && $post_data['meta'] ) {
		foreach ( $post_data['meta'] as $key => $value ) {
			if ( !$meta = get_post_meta_by_id( $key ) )
				continue;
			if ( $meta->post_id != $post_ID )
				continue;
			if ( is_protected_meta( $meta->meta_key, 'post' ) || ! current_user_can( 'edit_post_meta', $post_ID, $meta->meta_key ) )
				continue;
			if ( is_protected_meta( $value['key'], 'post' ) || ! current_user_can( 'edit_post_meta', $post_ID, $value['key'] ) )
				continue;
			update_meta( $key, $value['key'], $value['value'] );
		}
	}

	if ( isset($post_data['deletemeta']) && $post_data['deletemeta'] ) {
		foreach ( $post_data['deletemeta'] as $key => $value ) {
			if ( !$meta = get_post_meta_by_id( $key ) )
				continue;
			if ( $meta->post_id != $post_ID )
				continue;
			if ( is_protected_meta( $meta->meta_key, 'post' ) || ! current_user_can( 'delete_post_meta', $post_ID, $meta->meta_key ) )
				continue;
			delete_meta( $key );
		}
	}

	// Attachment stuff
	if ( 'attachment' == $post_data['post_type'] ) {
		if ( isset( $post_data[ '_wp_attachment_image_alt' ] ) ) {
			$image_alt = wp_unslash( $post_data['_wp_attachment_image_alt'] );
			if ( $image_alt != get_post_meta( $post_ID, '_wp_attachment_image_alt', true ) ) {
				$image_alt = wp_strip_all_tags( $image_alt, true );
				// update_meta expects slashed.
				update_post_meta( $post_ID, '_wp_attachment_image_alt', wp_slash( $image_alt ) );
			}
		}

		$attachment_data = isset( $post_data['attachments'][ $post_ID ] ) ? $post_data['attachments'][ $post_ID ] : array();

		/** This filter is documented in wp-admin/includes/media.php */
		$translated = apply_filters( 'attachment_fields_to_save', $translated, $attachment_data );
	}

	// Convert taxonomy input to term IDs, to avoid ambiguity.
	if ( isset( $post_data['tax_input'] ) ) {
		foreach ( (array) $post_data['tax_input'] as $taxonomy => $terms ) {
			// Hierarchical taxonomy data is already sent as term IDs, so no conversion is necessary.
			if ( is_taxonomy_hierarchical( $taxonomy ) ) {
				continue;
			}

			/*
			 * Assume that a 'tax_input' string is a comma-separated list of term names.
			 * Some languages may use a character other than a comma as a delimiter, so we standardize on
			 * commas before parsing the list.
			 */
			if ( ! is_array( $terms ) ) {
				$comma = _x( ',', 'tag delimiter' );
				if ( ',' !== $comma ) {
					$terms = str_replace( $comma, ',', $terms );
				}
				$terms = explode( ',', trim( $terms, " \n\t\r\0\x0B," ) );
			}

			$clean_terms = array();
			foreach ( $terms as $term ) {
				// Empty terms are invalid input.
				if ( empty( $term ) ) {
					continue;
				}

				$_term = get_terms( $taxonomy, array(
					'name' => $term,
					'fields' => 'ids',
					'hide_empty' => false,
				) );

				if ( ! empty( $_term ) ) {
					$clean_terms[] = intval( $_term[0] );
				} else {
					// No existing term was found, so pass the string. A new term will be created.
					$clean_terms[] = $term;
				}
			}

			$translated['tax_input'][ $taxonomy ] = $clean_terms;
		}
	}

	add_meta( $post_ID );

	update_post_meta( $post_ID, '_edit_last', get_current_user_id() );

	$success = wp_update_post( $translated );
	// If the save failed, see if we can sanity check the main fields and try again
	if ( ! $success && is_callable( array( $wpdb, 'strip_invalid_text_for_column' ) ) ) {
		$fields = array( 'post_title', 'post_content', 'post_excerpt' );

		foreach ( $fields as $field ) {
			if ( isset( $translated[ $field ] ) ) {
				$translated[ $field ] = $wpdb->strip_invalid_text_for_column( $wpdb->posts, $field, $translated[ $field ] );
			}
		}

		wp_update_post( $translated );
	}

	// Now that we have an ID we can fix any attachment anchor hrefs
	_fix_attachment_links( $post_ID );

	wp_set_post_lock( $post_ID );

	if ( current_user_can( $ptype->cap->edit_others_posts ) && current_user_can( $ptype->cap->publish_posts ) ) {
		if ( ! empty( $post_data['sticky'] ) )
			stick_post( $post_ID );
		else
			unstick_post( $post_ID );
	}

	return $post_ID;
}

/**
 * Process the post data for the bulk editing of posts.
 *
 * Updates all bulk edited posts/pages, adding (but not removing) tags and
 * categories. Skips pages when they would be their own parent or child.
 *
 * @since 2.7.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param array $post_data Optional, the array of post data to process if not provided will use $_POST superglobal.
 * @return array
 */
function bulk_edit_posts( $post_data = null ) {
	global $wpdb;

	if ( empty($post_data) )
		$post_data = &$_POST;

	if ( isset($post_data['post_type']) )
		$ptype = get_post_type_object($post_data['post_type']);
	else
		$ptype = get_post_type_object('post');

	if ( !current_user_can( $ptype->cap->edit_posts ) ) {
		if ( 'page' == $ptype->name )
			wp_die( __('Sorry, you are not allowed to edit pages.'));
		else
			wp_die( __('Sorry, you are not allowed to edit posts.'));
	}

	if ( -1 == $post_data['_status'] ) {
		$post_data['post_status'] = null;
		unset($post_data['post_status']);
	} else {
		$post_data['post_status'] = $post_data['_status'];
	}
	unset($post_data['_status']);

	if ( ! empty( $post_data['post_status'] ) ) {
		$post_data['post_status'] = sanitize_key( $post_data['post_status'] );

		if ( 'inherit' == $post_data['post_status'] ) {
			unset( $post_data['post_status'] );
		}
	}

	$post_IDs = array_map( 'intval', (array) $post_data['post'] );

	$reset = array(
		'post_author', 'post_status', 'post_password',
		'post_parent', 'page_template', 'comment_status',
		'ping_status', 'keep_private', 'tax_input',
		'post_category', 'sticky', 'post_format',
	);

	foreach ( $reset as $field ) {
		if ( isset($post_data[$field]) && ( '' == $post_data[$field] || -1 == $post_data[$field] ) )
			unset($post_data[$field]);
	}

	if ( isset($post_data['post_category']) ) {
		if ( is_array($post_data['post_category']) && ! empty($post_data['post_category']) )
			$new_cats = array_map( 'absint', $post_data['post_category'] );
		else
			unset($post_data['post_category']);
	}

	$tax_input = array();
	if ( isset($post_data['tax_input'])) {
		foreach ( $post_data['tax_input'] as $tax_name => $terms ) {
			if ( empty($terms) )
				continue;
			if ( is_taxonomy_hierarchical( $tax_name ) ) {
				$tax_input[ $tax_name ] = array_map( 'absint', $terms );
			} else {
				$comma = _x( ',', 'tag delimiter' );
				if ( ',' !== $comma )
					$terms = str_replace( $comma, ',', $terms );
				$tax_input[ $tax_name ] = explode( ',', trim( $terms, " \n\t\r\0\x0B," ) );
			}
		}
	}

	if ( isset($post_data['post_parent']) && ($parent = (int) $post_data['post_parent']) ) {
		$pages = $wpdb->get_results("SELECT ID, post_parent FROM $wpdb->posts WHERE post_type = 'page'");
		$children = array();

		for ( $i = 0; $i < 50 && $parent > 0; $i++ ) {
			$children[] = $parent;

			foreach ( $pages as $page ) {
				if ( $page->ID == $parent ) {
					$parent = $page->post_parent;
					break;
				}
			}
		}
	}

	$updated = $skipped = $locked = array();
	$shared_post_data = $post_data;

	foreach ( $post_IDs as $post_ID ) {
		// Start with fresh post data with each iteration.
		$post_data = $shared_post_data;

		$post_type_object = get_post_type_object( get_post_type( $post_ID ) );

		if ( !isset( $post_type_object ) || ( isset($children) && in_array($post_ID, $children) ) || !current_user_can( 'edit_post', $post_ID ) ) {
			$skipped[] = $post_ID;
			continue;
		}

		if ( wp_check_post_lock( $post_ID ) ) {
			$locked[] = $post_ID;
			continue;
		}

		$post = get_post( $post_ID );
		$tax_names = get_object_taxonomies( $post );
		foreach ( $tax_names as $tax_name ) {
			$taxonomy_obj = get_taxonomy($tax_name);
			if ( isset( $tax_input[$tax_name]) && current_user_can( $taxonomy_obj->cap->assign_terms ) )
				$new_terms = $tax_input[$tax_name];
			else
				$new_terms = array();

			if ( $taxonomy_obj->hierarchical )
				$current_terms = (array) wp_get_object_terms( $post_ID, $tax_name, array('fields' => 'ids') );
			else
				$current_terms = (array) wp_get_object_terms( $post_ID, $tax_name, array('fields' => 'names') );

			$post_data['tax_input'][$tax_name] = array_merge( $current_terms, $new_terms );
		}

		if ( isset($new_cats) && in_array( 'category', $tax_names ) ) {
			$cats = (array) wp_get_post_categories($post_ID);
			$post_data['post_category'] = array_unique( array_merge($cats, $new_cats) );
			unset( $post_data['tax_input']['category'] );
		}

		$post_data['post_ID']        = $post_ID;
		$post_data['post_type'] = $post->post_type;
		$post_data['post_mime_type'] = $post->post_mime_type;

		foreach ( array( 'comment_status', 'ping_status', 'post_author' ) as $field ) {
			if ( ! isset( $post_data[ $field ] ) ) {
				$post_data[ $field ] = $post->$field;
			}
		}

		$post_data = _wp_translate_postdata( true, $post_data );
		if ( is_wp_error( $post_data ) ) {
			$skipped[] = $post_ID;
			continue;
		}
		$post_data = _wp_get_allowed_postdata( $post_data );

		if ( isset( $shared_post_data['post_format'] ) ) {
			set_post_format( $post_ID, $shared_post_data['post_format'] );
			unset( $post_data['tax_input']['post_format'] );
		}

		$updated[] = wp_update_post( $post_data );

		if ( isset( $post_data['sticky'] ) && current_user_can( $ptype->cap->edit_others_posts ) ) {
			if ( 'sticky' == $post_data['sticky'] )
				stick_post( $post_ID );
			else
				unstick_post( $post_ID );
		}
	}

	return array( 'updated' => $updated, 'skipped' => $skipped, 'locked' => $locked );
}

/**
 * Default post information to use when populating the "Write Post" form.
 *
 * @since 2.0.0
 *
 * @param string $post_type    Optional. A post type string. Default 'post'.
 * @param bool   $create_in_db Optional. Whether to insert the post into database. Default false.
 * @return WP_Post Post object containing all the default post data as attributes
 */
function get_default_post_to_edit( $post_type = 'post', $create_in_db = false ) {
	$post_title = '';
	if ( !empty( $_REQUEST['post_title'] ) )
		$post_title = esc_html( wp_unslash( $_REQUEST['post_title'] ));

	$post_content = '';
	if ( !empty( $_REQUEST['content'] ) )
		$post_content = esc_html( wp_unslash( $_REQUEST['content'] ));

	$post_excerpt = '';
	if ( !empty( $_REQUEST['excerpt'] ) )
		$post_excerpt = esc_html( wp_unslash( $_REQUEST['excerpt'] ));

	if ( $create_in_db ) {
		$post_id = wp_insert_post( array( 'post_title' => __( 'Auto Draft' ), 'post_type' => $post_type, 'post_status' => 'auto-draft' ) );
		$post = get_post( $post_id );
		if ( current_theme_supports( 'post-formats' ) && post_type_supports( $post->post_type, 'post-formats' ) && get_option( 'default_post_format' ) )
			set_post_format( $post, get_option( 'default_post_format' ) );
	} else {
		$post = new stdClass;
		$post->ID = 0;
		$post->post_author = '';
		$post->post_date = '';
		$post->post_date_gmt = '';
		$post->post_password = '';
		$post->post_name = '';
		$post->post_type = $post_type;
		$post->post_status = 'draft';
		$post->to_ping = '';
		$post->pinged = '';
		$post->comment_status = get_default_comment_status( $post_type );
		$post->ping_status = get_default_comment_status( $post_type, 'pingback' );
		$post->post_pingback = get_option( 'default_pingback_flag' );
		$post->post_category = get_option( 'default_category' );
		$post->page_template = 'default';
		$post->post_parent = 0;
		$post->menu_order = 0;
		$post = new WP_Post( $post );
	}

	/**
	 * Filters the default post content initially used in the "Write Post" form.
	 *
	 * @since 1.5.0
	 *
	 * @param string  $post_content Default post content.
	 * @param WP_Post $post         Post object.
	 */
	$post->post_content = (string) apply_filters( 'default_content', $post_content, $post );

	/**
	 * Filters the default post title initially used in the "Write Post" form.
	 *
	 * @since 1.5.0
	 *
	 * @param string  $post_title Default post title.
	 * @param WP_Post $post       Post object.
	 */
	$post->post_title = (string) apply_filters( 'default_title', $post_title, $post );

	/**
	 * Filters the default post excerpt initially used in the "Write Post" form.
	 *
	 * @since 1.5.0
	 *
	 * @param string  $post_excerpt Default post excerpt.
	 * @param WP_Post $post         Post object.
	 */
	$post->post_excerpt = (string) apply_filters( 'default_excerpt', $post_excerpt, $post );

	return $post;
}

/**
 * Determine if a post exists based on title, content, and date
 *
 * @since 2.0.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $title Post title
 * @param string $content Optional post content
 * @param string $date Optional post date
 * @return int Post ID if post exists, 0 otherwise.
 */
function post_exists($title, $content = '', $date = '') {
	global $wpdb;

	$post_title = wp_unslash( sanitize_post_field( 'post_title', $title, 0, 'db' ) );
	$post_content = wp_unslash( sanitize_post_field( 'post_content', $content, 0, 'db' ) );
	$post_date = wp_unslash( sanitize_post_field( 'post_date', $date, 0, 'db' ) );

	$query = "SELECT ID FROM $wpdb->posts WHERE 1=1";
	$args = array();

	if ( !empty ( $date ) ) {
		$query .= ' AND post_date = %s';
		$args[] = $post_date;
	}

	if ( !empty ( $title ) ) {
		$query .= ' AND post_title = %s';
		$args[] = $post_title;
	}

	if ( !empty ( $content ) ) {
		$query .= ' AND post_content = %s';
		$args[] = $post_content;
	}

	if ( !empty ( $args ) )
		return (int) $wpdb->get_var( $wpdb->prepare($query, $args) );

	return 0;
}

/**
 * Creates a new post from the "Write Post" form using $_POST information.
 *
 * @since 2.1.0
 *
 * @global WP_User $current_user
 *
 * @return int|WP_Error
 */
function wp_write_post() {
	if ( isset($_POST['post_type']) )
		$ptype = get_post_type_object($_POST['post_type']);
	else
		$ptype = get_post_type_object('post');

	if ( !current_user_can( $ptype->cap->edit_posts ) ) {
		if ( 'page' == $ptype->name )
			return new WP_Error( 'edit_pages', __( 'Sorry, you are not allowed to create pages on this site.' ) );
		else
			return new WP_Error( 'edit_posts', __( 'Sorry, you are not allowed to create posts or drafts on this site.' ) );
	}

	$_POST['post_mime_type'] = '';

	// Clear out any data in internal vars.
	unset( $_POST['filter'] );

	// Edit don't write if we have a post id.
	if ( isset( $_POST['post_ID'] ) )
		return edit_post();

	if ( isset($_POST['visibility']) ) {
		switch ( $_POST['visibility'] ) {
			case 'public' :
				$_POST['post_password'] = '';
				break;
			case 'password' :
				unset( $_POST['sticky'] );
				break;
			case 'private' :
				$_POST['post_status'] = 'private';
				$_POST['post_password'] = '';
				unset( $_POST['sticky'] );
				break;
		}
	}

	$translated = _wp_translate_postdata( false );
	if ( is_wp_error($translated) )
		return $translated;
	$translated = _wp_get_allowed_postdata( $translated );

	// Create the post.
	$post_ID = wp_insert_post( $translated );
	if ( is_wp_error( $post_ID ) )
		return $post_ID;

	if ( empty($post_ID) )
		return 0;

	add_meta( $post_ID );

	add_post_meta( $post_ID, '_edit_last', $GLOBALS['current_user']->ID );

	// Now that we have an ID we can fix any attachment anchor hrefs
	_fix_attachment_links( $post_ID );

	wp_set_post_lock( $post_ID );

	return $post_ID;
}

/**
 * Calls wp_write_post() and handles the errors.
 *
 * @since 2.0.0
 *
 * @return int|null
 */
function write_post() {
	$result = wp_write_post();
	if ( is_wp_error( $result ) )
		wp_die( $result->get_error_message() );
	else
		return $result;
}

//
// Post Meta
//

/**
 * Add post meta data defined in $_POST superglobal for post with given ID.
 *
 * @since 1.2.0
 *
 * @param int $post_ID
 * @return int|bool
 */
function add_meta( $post_ID ) {
	$post_ID = (int) $post_ID;

	$metakeyselect = isset($_POST['metakeyselect']) ? wp_unslash( trim( $_POST['metakeyselect'] ) ) : '';
	$metakeyinput = isset($_POST['metakeyinput']) ? wp_unslash( trim( $_POST['metakeyinput'] ) ) : '';
	$metavalue = isset($_POST['metavalue']) ? $_POST['metavalue'] : '';
	if ( is_string( $metavalue ) )
		$metavalue = trim( $metavalue );

	if ( ( ( '#NONE#' != $metakeyselect ) && ! empty( $metakeyselect ) ) || ! empty( $metakeyinput ) ) {
		/*
		 * We have a key/value pair. If both the select and the input
		 * for the key have data, the input takes precedence.
		 */
 		if ( '#NONE#' != $metakeyselect )
			$metakey = $metakeyselect;

		if ( $metakeyinput )
			$metakey = $metakeyinput; // default

		if ( is_protected_meta( $metakey, 'post' ) || ! current_user_can( 'add_post_meta', $post_ID, $metakey ) )
			return false;

		$metakey = wp_slash( $metakey );

		return add_post_meta( $post_ID, $metakey, $metavalue );
	}

	return false;
} // add_meta

/**
 * Delete post meta data by meta ID.
 *
 * @since 1.2.0
 *
 * @param int $mid
 * @return bool
 */
function delete_meta( $mid ) {
	return delete_metadata_by_mid( 'post' , $mid );
}

/**
 * Get a list of previously defined keys.
 *
 * @since 1.2.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @return mixed
 */
function get_meta_keys() {
	global $wpdb;

	$keys = $wpdb->get_col( "
			SELECT meta_key
			FROM $wpdb->postmeta
			GROUP BY meta_key
			ORDER BY meta_key" );

	return $keys;
}

/**
 * Get post meta data by meta ID.
 *
 * @since 2.1.0
 *
 * @param int $mid
 * @return object|bool
 */
function get_post_meta_by_id( $mid ) {
	return get_metadata_by_mid( 'post', $mid );
}

/**
 * Get meta data for the given post ID.
 *
 * @since 1.2.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int $postid
 * @return mixed
 */
function has_meta( $postid ) {
	global $wpdb;

	return $wpdb->get_results( $wpdb->prepare("SELECT meta_key, meta_value, meta_id, post_id
			FROM $wpdb->postmeta WHERE post_id = %d
			ORDER BY meta_key,meta_id", $postid), ARRAY_A );
}

/**
 * Update post meta data by meta ID.
 *
 * @since 1.2.0
 *
 * @param int    $meta_id
 * @param string $meta_key Expect Slashed
 * @param string $meta_value Expect Slashed
 * @return bool
 */
function update_meta( $meta_id, $meta_key, $meta_value ) {
	$meta_key = wp_unslash( $meta_key );
	$meta_value = wp_unslash( $meta_value );

	return update_metadata_by_mid( 'post', $meta_id, $meta_value, $meta_key );
}

//
// Private
//

/**
 * Replace hrefs of attachment anchors with up-to-date permalinks.
 *
 * @since 2.3.0
 * @access private
 *
 * @param int|object $post Post ID or post object.
 * @return void|int|WP_Error Void if nothing fixed. 0 or WP_Error on update failure. The post ID on update success.
 */
function _fix_attachment_links( $post ) {
	$post = get_post( $post, ARRAY_A );
	$content = $post['post_content'];

	// Don't run if no pretty permalinks or post is not published, scheduled, or privately published.
	if ( ! get_option( 'permalink_structure' ) || ! in_array( $post['post_status'], array( 'publish', 'future', 'private' ) ) )
		return;

	// Short if there aren't any links or no '?attachment_id=' strings (strpos cannot be zero)
	if ( !strpos($content, '?attachment_id=') || !preg_match_all( '/<a ([^>]+)>[\s\S]+?<\/a>/', $content, $link_matches ) )
		return;

	$site_url = get_bloginfo('url');
	$site_url = substr( $site_url, (int) strpos($site_url, '://') ); // remove the http(s)
	$replace = '';

	foreach ( $link_matches[1] as $key => $value ) {
		if ( !strpos($value, '?attachment_id=') || !strpos($value, 'wp-att-')
			|| !preg_match( '/href=(["\'])[^"\']*\?attachment_id=(\d+)[^"\']*\\1/', $value, $url_match )
			|| !preg_match( '/rel=["\'][^"\']*wp-att-(\d+)/', $value, $rel_match ) )
				continue;

		$quote = $url_match[1]; // the quote (single or double)
		$url_id = (int) $url_match[2];
		$rel_id = (int) $rel_match[1];

		if ( !$url_id || !$rel_id || $url_id != $rel_id || strpos($url_match[0], $site_url) === false )
			continue;

		$link = $link_matches[0][$key];
		$replace = str_replace( $url_match[0], 'href=' . $quote . get_attachment_link( $url_id ) . $quote, $link );

		$content = str_replace( $link, $replace, $content );
	}

	if ( $replace ) {
		$post['post_content'] = $content;
		// Escape data pulled from DB.
		$post = add_magic_quotes($post);

		return wp_update_post($post);
	}
}

/**
 * Get all the possible statuses for a post_type
 *
 * @since 2.5.0
 *
 * @param string $type The post_type you want the statuses for
 * @return array As array of all the statuses for the supplied post type
 */
function get_available_post_statuses($type = 'post') {
	$stati = wp_count_posts($type);

	return array_keys(get_object_vars($stati));
}

/**
 * Run the wp query to fetch the posts for listing on the edit posts page
 *
 * @since 2.5.0
 *
 * @param array|bool $q Array of query variables to use to build the query or false to use $_GET superglobal.
 * @return array
 */
function wp_edit_posts_query( $q = false ) {
	if ( false === $q )
		$q = $_GET;
	$q['m'] = isset($q['m']) ? (int) $q['m'] : 0;
	$q['cat'] = isset($q['cat']) ? (int) $q['cat'] : 0;
	$post_stati  = get_post_stati();

	if ( isset($q['post_type']) && in_array( $q['post_type'], get_post_types() ) )
		$post_type = $q['post_type'];
	else
		$post_type = 'post';

	$avail_post_stati = get_available_post_statuses($post_type);
	$post_status      = '';
	$perm             = '';

	if ( isset($q['post_status']) && in_array( $q['post_status'], $post_stati ) ) {
		$post_status = $q['post_status'];
		$perm = 'readable';
	}

	$orderby = '';

	if ( isset( $q['orderby'] ) ) {
		$orderby = $q['orderby'];
	} elseif ( isset( $q['post_status'] ) && in_array( $q['post_status'], array( 'pending', 'draft' ) ) ) {
		$orderby = 'modified';
	}

	$order = '';

	if ( isset( $q['order'] ) ) {
		$order = $q['order'];
	} elseif ( isset( $q['post_status'] ) && 'pending' == $q['post_status'] ) {
		$order = 'ASC';
	}

	$per_page = "edit_{$post_type}_per_page";
	$posts_per_page = (int) get_user_option( $per_page );
	if ( empty( $posts_per_page ) || $posts_per_page < 1 )
		$posts_per_page = 20;

	/**
	 * Filters the number of items per page to show for a specific 'per_page' type.
	 *
	 * The dynamic portion of the hook name, `$post_type`, refers to the post type.
	 *
	 * Some examples of filter hooks generated here include: 'edit_attachment_per_page',
	 * 'edit_post_per_page', 'edit_page_per_page', etc.
	 *
	 * @since 3.0.0
	 *
	 * @param int $posts_per_page Number of posts to display per page for the given post
	 *                            type. Default 20.
	 */
	$posts_per_page = apply_filters( "edit_{$post_type}_per_page", $posts_per_page );

	/**
	 * Filters the number of posts displayed per page when specifically listing "posts".
	 *
	 * @since 2.8.0
	 *
	 * @param int    $posts_per_page Number of posts to be displayed. Default 20.
	 * @param string $post_type      The post type.
	 */
	$posts_per_page = apply_filters( 'edit_posts_per_page', $posts_per_page, $post_type );

	$query = compact('post_type', 'post_status', 'perm', 'order', 'orderby', 'posts_per_page');

	// Hierarchical types require special args.
	if ( is_post_type_hierarchical( $post_type ) && empty( $orderby ) ) {
		$query['orderby'] = 'menu_order title';
		$query['order'] = 'asc';
		$query['posts_per_page'] = -1;
		$query['posts_per_archive_page'] = -1;
		$query['fields'] = 'id=>parent';
	}

	if ( ! empty( $q['show_sticky'] ) )
		$query['post__in'] = (array) get_option( 'sticky_posts' );

	wp( $query );

	return $avail_post_stati;
}

/**
 * Get all available post MIME types for a given post type.
 *
 * @since 2.5.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $type
 * @return mixed
 */
function get_available_post_mime_types($type = 'attachment') {
	global $wpdb;

	$types = $wpdb->get_col($wpdb->prepare("SELECT DISTINCT post_mime_type FROM $wpdb->posts WHERE post_type = %s", $type));
	return $types;
}

/**
 * Get the query variables for the current attachments request.
 *
 * @since 4.2.0
 *
 * @param array|false $q Optional. Array of query variables to use to build the query or false
 *                       to use $_GET superglobal. Default false.
 * @return array The parsed query vars.
 */
function wp_edit_attachments_query_vars( $q = false ) {
	if ( false === $q ) {
		$q = $_GET;
	}
	$q['m']   = isset( $q['m'] ) ? (int) $q['m'] : 0;
	$q['cat'] = isset( $q['cat'] ) ? (int) $q['cat'] : 0;
	$q['post_type'] = 'attachment';
	$post_type = get_post_type_object( 'attachment' );
	$states = 'inherit';
	if ( current_user_can( $post_type->cap->read_private_posts ) ) {
		$states .= ',private';
	}

	$q['post_status'] = isset( $q['status'] ) && 'trash' == $q['status'] ? 'trash' : $states;
	$q['post_status'] = isset( $q['attachment-filter'] ) && 'trash' == $q['attachment-filter'] ? 'trash' : $states;

	$media_per_page = (int) get_user_option( 'upload_per_page' );
	if ( empty( $media_per_page ) || $media_per_page < 1 ) {
		$media_per_page = 20;
	}

	/**
	 * Filters the number of items to list per page when listing media items.
	 *
	 * @since 2.9.0
	 *
	 * @param int $media_per_page Number of media to list. Default 20.
	 */
	$q['posts_per_page'] = apply_filters( 'upload_per_page', $media_per_page );

	$post_mime_types = get_post_mime_types();
	if ( isset($q['post_mime_type']) && !array_intersect( (array) $q['post_mime_type'], array_keys($post_mime_types) ) ) {
		unset($q['post_mime_type']);
	}

	foreach ( array_keys( $post_mime_types ) as $type ) {
		if ( isset( $q['attachment-filter'] ) && "post_mime_type:$type" == $q['attachment-filter'] ) {
			$q['post_mime_type'] = $type;
			break;
		}
	}

	if ( isset( $q['detached'] ) || ( isset( $q['attachment-filter'] ) && 'detached' == $q['attachment-filter'] ) ) {
		$q['post_parent'] = 0;
	}

	if ( isset( $q['mine'] ) || ( isset( $q['attachment-filter'] ) && 'mine' == $q['attachment-filter'] ) ) {
		$q['author'] = get_current_user_id();
	}

	// Filter query clauses to include filenames.
	if ( isset( $q['s'] ) ) {
		add_filter( 'wp_allow_query_attachment_by_filename', '__return_true' );
	}

	return $q;
}

/**
 * Executes a query for attachments. An array of WP_Query arguments
 * can be passed in, which will override the arguments set by this function.
 *
 * @since 2.5.0
 *
 * @param array|false $q Array of query variables to use to build the query or false to use $_GET superglobal.
 * @return array
 */
function wp_edit_attachments_query( $q = false ) {
	wp( wp_edit_attachments_query_vars( $q ) );

	$post_mime_types = get_post_mime_types();
	$avail_post_mime_types = get_available_post_mime_types( 'attachment' );

	return array( $post_mime_types, $avail_post_mime_types );
}

/**
 * Returns the list of classes to be used by a meta box.
 *
 * @since 2.5.0
 *
 * @param string $id
 * @param string $page
 * @return string
 */
function postbox_classes( $id, $page ) {
	if ( isset( $_GET['edit'] ) && $_GET['edit'] == $id ) {
		$classes = array( '' );
	} elseif ( $closed = get_user_option('closedpostboxes_'.$page ) ) {
		if ( !is_array( $closed ) ) {
			$classes = array( '' );
		} else {
			$classes = in_array( $id, $closed ) ? array( 'closed' ) : array( '' );
		}
	} else {
		$classes = array( '' );
	}

	/**
	 * Filters the postbox classes for a specific screen and screen ID combo.
	 *
	 * The dynamic portions of the hook name, `$page` and `$id`, refer to
	 * the screen and screen ID, respectively.
	 *
	 * @since 3.2.0
	 *
	 * @param array $classes An array of postbox classes.
	 */
	$classes = apply_filters( "postbox_classes_{$page}_{$id}", $classes );
	return implode( ' ', $classes );
}

/**
 * Get a sample permalink based off of the post name.
 *
 * @since 2.5.0
 *
 * @param int    $id    Post ID or post object.
 * @param string $title Optional. Title to override the post's current title when generating the post name. Default null.
 * @param string $name  Optional. Name to override the post name. Default null.
 * @return array Array containing the sample permalink with placeholder for the post name, and the post name.
 */
function get_sample_permalink($id, $title = null, $name = null) {
	$post = get_post( $id );
	if ( ! $post )
		return array( '', '' );

	$ptype = get_post_type_object($post->post_type);

	$original_status = $post->post_status;
	$original_date = $post->post_date;
	$original_name = $post->post_name;

	// Hack: get_permalink() would return ugly permalink for drafts, so we will fake that our post is published.
	if ( in_array( $post->post_status, array( 'draft', 'pending', 'future' ) ) ) {
		$post->post_status = 'publish';
		$post->post_name = sanitize_title($post->post_name ? $post->post_name : $post->post_title, $post->ID);
	}

	// If the user wants to set a new name -- override the current one
	// Note: if empty name is supplied -- use the title instead, see #6072
	if ( !is_null($name) )
		$post->post_name = sanitize_title($name ? $name : $title, $post->ID);

	$post->post_name = wp_unique_post_slug($post->post_name, $post->ID, $post->post_status, $post->post_type, $post->post_parent);

	$post->filter = 'sample';

	$permalink = get_permalink($post, true);

	// Replace custom post_type Token with generic pagename token for ease of use.
	$permalink = str_replace("%$post->post_type%", '%pagename%', $permalink);

	// Handle page hierarchy
	if ( $ptype->hierarchical ) {
		$uri = get_page_uri($post);
		if ( $uri ) {
			$uri = untrailingslashit($uri);
			$uri = strrev( stristr( strrev( $uri ), '/' ) );
			$uri = untrailingslashit($uri);
		}

		/** This filter is documented in wp-admin/edit-tag-form.php */
		$uri = apply_filters( 'editable_slug', $uri, $post );
		if ( !empty($uri) )
			$uri .= '/';
		$permalink = str_replace('%pagename%', "{$uri}%pagename%", $permalink);
	}

	/** This filter is documented in wp-admin/edit-tag-form.php */
	$permalink = array( $permalink, apply_filters( 'editable_slug', $post->post_name, $post ) );
	$post->post_status = $original_status;
	$post->post_date = $original_date;
	$post->post_name = $original_name;
	unset($post->filter);

	/**
	 * Filters the sample permalink.
	 *
	 * @since 4.4.0
	 *
	 * @param array   $permalink Array containing the sample permalink with placeholder for the post name, and the post name.
	 * @param int     $post_id   Post ID.
	 * @param string  $title     Post title.
	 * @param string  $name      Post name (slug).
	 * @param WP_Post $post      Post object.
	 */
	return apply_filters( 'get_sample_permalink', $permalink, $post->ID, $title, $name, $post );
}

/**
 * Returns the HTML of the sample permalink slug editor.
 *
 * @since 2.5.0
 *
 * @param int    $id        Post ID or post object.
 * @param string $new_title Optional. New title. Default null.
 * @param string $new_slug  Optional. New slug. Default null.
 * @return string The HTML of the sample permalink slug editor.
 */
function get_sample_permalink_html( $id, $new_title = null, $new_slug = null ) {
	$post = get_post( $id );
	if ( ! $post )
		return '';

	list($permalink, $post_name) = get_sample_permalink($post->ID, $new_title, $new_slug);

	$view_link = false;
	$preview_target = '';

	if ( current_user_can( 'read_post', $post->ID ) ) {
		if ( 'draft' === $post->post_status || empty( $post->post_name ) ) {
			$view_link = get_preview_post_link( $post );
			$preview_target = " target='wp-preview-{$post->ID}'";
		} else {
			if ( 'publish' === $post->post_status || 'attachment' === $post->post_type ) {
				$view_link = get_permalink( $post );
			} else {
				// Allow non-published (private, future) to be viewed at a pretty permalink, in case $post->post_name is set
				$view_link = str_replace( array( '%pagename%', '%postname%' ), $post->post_name, $permalink );
			}
		}
	}

	// Permalinks without a post/page name placeholder don't have anything to edit
	if ( false === strpos( $permalink, '%postname%' ) && false === strpos( $permalink, '%pagename%' ) ) {
		$return = '<strong>' . __( 'Permalink:' ) . "</strong>\n";

		if ( false !== $view_link ) {
			$display_link = urldecode( $view_link );
			$return .= '<a id="sample-permalink" href="' . esc_url( $view_link ) . '"' . $preview_target . '>' . esc_html( $display_link ) . "</a>\n";
		} else {
			$return .= '<span id="sample-permalink">' . $permalink . "</span>\n";
		}

		// Encourage a pretty permalink setting
		if ( '' == get_option( 'permalink_structure' ) && current_user_can( 'manage_options' ) && !( 'page' == get_option('show_on_front') && $id == get_option('page_on_front') ) ) {
			$return .= '<span id="change-permalinks"><a href="options-permalink.php" class="button button-small" target="_blank">' . __('Change Permalinks') . "</a></span>\n";
		}
	} else {
		if ( mb_strlen( $post_name ) > 34 ) {
			$post_name_abridged = mb_substr( $post_name, 0, 16 ) . '&hellip;' . mb_substr( $post_name, -16 );
		} else {
			$post_name_abridged = $post_name;
		}

		$post_name_html = '<span id="editable-post-name">' . esc_html( $post_name_abridged ) . '</span>';
		$display_link = str_replace( array( '%pagename%', '%postname%' ), $post_name_html, esc_html( urldecode( $permalink ) ) );

		$return = '<strong>' . __( 'Permalink:' ) . "</strong>\n";
		$return .= '<span id="sample-permalink"><a href="' . esc_url( $view_link ) . '"' . $preview_target . '>' . $display_link . "</a></span>\n";
		$return .= '&lrm;'; // Fix bi-directional text display defect in RTL languages.
		$return .= '<span id="edit-slug-buttons"><button type="button" class="edit-slug button button-small hide-if-no-js" aria-label="' . __( 'Edit permalink' ) . '">' . __( 'Edit' ) . "</button></span>\n";
		$return .= '<span id="editable-post-name-full">' . esc_html( $post_name ) . "</span>\n";
	}

	/**
	 * Filters the sample permalink HTML markup.
	 *
	 * @since 2.9.0
	 * @since 4.4.0 Added `$post` parameter.
	 *
	 * @param string  $return    Sample permalink HTML markup.
	 * @param int     $post_id   Post ID.
	 * @param string  $new_title New sample permalink title.
	 * @param string  $new_slug  New sample permalink slug.
	 * @param WP_Post $post      Post object.
	 */
	$return = apply_filters( 'get_sample_permalink_html', $return, $post->ID, $new_title, $new_slug, $post );

	return $return;
}

/**
 * Output HTML for the post thumbnail meta-box.
 *
 * @since 2.9.0
 *
 * @param int $thumbnail_id ID of the attachment used for thumbnail
 * @param mixed $post The post ID or object associated with the thumbnail, defaults to global $post.
 * @return string html
 */
function _wp_post_thumbnail_html( $thumbnail_id = null, $post = null ) {
	$_wp_additional_image_sizes = wp_get_additional_image_sizes();

	$post               = get_post( $post );
	$post_type_object   = get_post_type_object( $post->post_type );
	$set_thumbnail_link = '<p class="hide-if-no-js"><a href="%s" id="set-post-thumbnail"%s class="thickbox">%s</a></p>';
	$upload_iframe_src  = get_upload_iframe_src( 'image', $post->ID );

	$content = sprintf( $set_thumbnail_link,
		esc_url( $upload_iframe_src ),
		'', // Empty when there's no featured image set, `aria-describedby` attribute otherwise.
		esc_html( $post_type_object->labels->set_featured_image )
	);

	if ( $thumbnail_id && get_post( $thumbnail_id ) ) {
		$size = isset( $_wp_additional_image_sizes['post-thumbnail'] ) ? 'post-thumbnail' : array( 266, 266 );

		/**
		 * Filters the size used to display the post thumbnail image in the 'Featured Image' meta box.
		 *
		 * Note: When a theme adds 'post-thumbnail' support, a special 'post-thumbnail'
		 * image size is registered, which differs from the 'thumbnail' image size
		 * managed via the Settings > Media screen. See the `$size` parameter description
		 * for more information on default values.
		 *
		 * @since 4.4.0
		 *
		 * @param string|array $size         Post thumbnail image size to display in the meta box. Accepts any valid
		 *                                   image size, or an array of width and height values in pixels (in that order).
		 *                                   If the 'post-thumbnail' size is set, default is 'post-thumbnail'. Otherwise,
		 *                                   default is an array with 266 as both the height and width values.
		 * @param int          $thumbnail_id Post thumbnail attachment ID.
		 * @param WP_Post      $post         The post object associated with the thumbnail.
		 */
		$size = apply_filters( 'admin_post_thumbnail_size', $size, $thumbnail_id, $post );

		$thumbnail_html = wp_get_attachment_image( $thumbnail_id, $size );

		if ( ! empty( $thumbnail_html ) ) {
			$content = sprintf( $set_thumbnail_link,
				esc_url( $upload_iframe_src ),
				' aria-describedby="set-post-thumbnail-desc"',
				$thumbnail_html
			);
			$content .= '<p class="hide-if-no-js howto" id="set-post-thumbnail-desc">' . __( 'Click the image to edit or update' ) . '</p>';
			$content .= '<p class="hide-if-no-js"><a href="#" id="remove-post-thumbnail">' . esc_html( $post_type_object->labels->remove_featured_image ) . '</a></p>';
		}
	}

	$content .= '<input type="hidden" id="_thumbnail_id" name="_thumbnail_id" value="' . esc_attr( $thumbnail_id ? $thumbnail_id : '-1' ) . '" />';

	/**
	 * Filters the admin post thumbnail HTML markup to return.
	 *
	 * @since 2.9.0
	 * @since 3.5.0 Added the `$post_id` parameter.
	 * @since 4.6.0 Added the `$thumbnail_id` parameter.
	 *
	 * @param string $content      Admin post thumbnail HTML markup.
	 * @param int    $post_id      Post ID.
	 * @param int    $thumbnail_id Thumbnail ID.
	 */
	return apply_filters( 'admin_post_thumbnail_html', $content, $post->ID, $thumbnail_id );
}

/**
 * Check to see if the post is currently being edited by another user.
 *
 * @since 2.5.0
 *
 * @param int $post_id ID of the post to check for editing.
 * @return int|false ID of the user with lock. False if the post does not exist, post is not locked,
 *                   the user with lock does not exist, or the post is locked by current user.
 */
function wp_check_post_lock( $post_id ) {
	if ( ! $post = get_post( $post_id ) ) {
		return false;
	}

	if ( ! $lock = get_post_meta( $post->ID, '_edit_lock', true ) ) {
		return false;
	}

	$lock = explode( ':', $lock );
	$time = $lock[0];
	$user = isset( $lock[1] ) ? $lock[1] : get_post_meta( $post->ID, '_edit_last', true );

	if ( ! get_userdata( $user ) ) {
		return false;
	}

	/** This filter is documented in wp-admin/includes/ajax-actions.php */
	$time_window = apply_filters( 'wp_check_post_lock_window', 150 );

	if ( $time && $time > time() - $time_window && $user != get_current_user_id() ) {
		return $user;
	}

	return false;
}

/**
 * Mark the post as currently being edited by the current user
 *
 * @since 2.5.0
 *
 * @param int $post_id ID of the post being edited.
 * @return array|false Array of the lock time and user ID. False if the post does not exist, or
 *                     there is no current user.
 */
function wp_set_post_lock( $post_id ) {
	if ( ! $post = get_post( $post_id ) ) {
		return false;
	}

	if ( 0 == ( $user_id = get_current_user_id() ) ) {
		return false;
	}

	$now = time();
	$lock = "$now:$user_id";

	update_post_meta( $post->ID, '_edit_lock', $lock );

	return array( $now, $user_id );
}

/**
 * Outputs the HTML for the notice to say that someone else is editing or has taken over editing of this post.
 *
 * @since 2.8.5
 * @return none
 */
function _admin_notice_post_locked() {
	if ( ! $post = get_post() )
		return;

	$user = null;
	if (  $user_id = wp_check_post_lock( $post->ID ) )
		$user = get_userdata( $user_id );

	if ( $user ) {

		/**
		 * Filters whether to show the post locked dialog.
		 *
		 * Returning a falsey value to the filter will short-circuit displaying the dialog.
		 *
		 * @since 3.6.0
		 *
		 * @param bool         $display Whether to display the dialog. Default true.
		 * @param WP_Post      $post    Post object.
		 * @param WP_User|bool $user    WP_User object on success, false otherwise.
		 */
		if ( ! apply_filters( 'show_post_locked_dialog', true, $post, $user ) )
			return;

		$locked = true;
	} else {
		$locked = false;
	}

	if ( $locked && ( $sendback = wp_get_referer() ) &&
		false === strpos( $sendback, 'post.php' ) && false === strpos( $sendback, 'post-new.php' ) ) {

		$sendback_text = __('Go back');
	} else {
		$sendback = admin_url( 'edit.php' );

		if ( 'post' != $post->post_type )
			$sendback = add_query_arg( 'post_type', $post->post_type, $sendback );

		$sendback_text = get_post_type_object( $post->post_type )->labels->all_items;
	}

	$hidden = $locked ? '' : ' hidden';

	?>
	<div id="post-lock-dialog" class="notification-dialog-wrap<?php echo $hidden; ?>">
	<div class="notification-dialog-background"></div>
	<div class="notification-dialog">
	<?php

	if ( $locked ) {
		$query_args = array();
		if ( get_post_type_object( $post->post_type )->public ) {
			if ( 'publish' == $post->post_status || $user->ID != $post->post_author ) {
				// Latest content is in autosave
				$nonce = wp_create_nonce( 'post_preview_' . $post->ID );
				$query_args['preview_id'] = $post->ID;
				$query_args['preview_nonce'] = $nonce;
			}
		}

		$preview_link = get_preview_post_link( $post->ID, $query_args );

		/**
		 * Filters whether to allow the post lock to be overridden.
		 *
		 * Returning a falsey value to the filter will disable the ability
		 * to override the post lock.
		 *
		 * @since 3.6.0
		 *
		 * @param bool    $override Whether to allow overriding post locks. Default true.
		 * @param WP_Post $post     Post object.
		 * @param WP_User $user     User object.
		 */
		$override = apply_filters( 'override_post_lock', true, $post, $user );
		$tab_last = $override ? '' : ' wp-tab-last';

		?>
		<div class="post-locked-message">
		<div class="post-locked-avatar"><?php echo get_avatar( $user->ID, 64 ); ?></div>
		<p class="currently-editing wp-tab-first" tabindex="0">
		<?php
			if ( $override ) {
				/* translators: %s: user's display name */
				printf( __( '%s is already editing this post. Do you want to take over?' ), esc_html( $user->display_name ) );
			} else {
				/* translators: %s: user's display name */
				printf( __( '%s is already editing this post.' ), esc_html( $user->display_name ) );
			}
		?>
		</p>
		<?php
		/**
		 * Fires inside the post locked dialog before the buttons are displayed.
		 *
		 * @since 3.6.0
		 *
		 * @param WP_Post $post Post object.
		 */
		do_action( 'post_locked_dialog', $post );
		?>
		<p>
		<a class="button" href="<?php echo esc_url( $sendback ); ?>"><?php echo $sendback_text; ?></a>
		<?php if ( $preview_link ) { ?>
		<a class="button<?php echo $tab_last; ?>" href="<?php echo esc_url( $preview_link ); ?>"><?php _e('Preview'); ?></a>
		<?php
		}

		// Allow plugins to prevent some users overriding the post lock
		if ( $override ) {
			?>
			<a class="button button-primary wp-tab-last" href="<?php echo esc_url( add_query_arg( 'get-post-lock', '1', wp_nonce_url( get_edit_post_link( $post->ID, 'url' ), 'lock-post_' . $post->ID ) ) ); ?>"><?php _e('Take over'); ?></a>
			<?php
		}

		?>
		</p>
		</div>
		<?php
	} else {
		?>
		<div class="post-taken-over">
			<div class="post-locked-avatar"></div>
			<p class="wp-tab-first" tabindex="0">
			<span class="currently-editing"></span><br />
			<span class="locked-saving hidden"><img src="<?php echo esc_url( admin_url( 'images/spinner-2x.gif' ) ); ?>" width="16" height="16" alt="" /> <?php _e( 'Saving revision&hellip;' ); ?></span>
			<span class="locked-saved hidden"><?php _e('Your latest changes were saved as a revision.'); ?></span>
			</p>
			<?php
			/**
			 * Fires inside the dialog displayed when a user has lost the post lock.
			 *
			 * @since 3.6.0
			 *
			 * @param WP_Post $post Post object.
			 */
			do_action( 'post_lock_lost_dialog', $post );
			?>
			<p><a class="button button-primary wp-tab-last" href="<?php echo esc_url( $sendback ); ?>"><?php echo $sendback_text; ?></a></p>
		</div>
		<?php
	}

	?>
	</div>
	</div>
	<?php
}

/**
 * Creates autosave data for the specified post from $_POST data.
 *
 * @since 2.6.0
 *
 * @param mixed $post_data Associative array containing the post data or int post ID.
 * @return mixed The autosave revision ID. WP_Error or 0 on error.
 */
function wp_create_post_autosave( $post_data ) {
	if ( is_numeric( $post_data ) ) {
		$post_id = $post_data;
		$post_data = $_POST;
	} else {
		$post_id = (int) $post_data['post_ID'];
	}

	$post_data = _wp_translate_postdata( true, $post_data );
	if ( is_wp_error( $post_data ) )
		return $post_data;
	$post_data = _wp_get_allowed_postdata( $post_data );

	$post_author = get_current_user_id();

	// Store one autosave per author. If there is already an autosave, overwrite it.
	if ( $old_autosave = wp_get_post_autosave( $post_id, $post_author ) ) {
		$new_autosave = _wp_post_revision_data( $post_data, true );
		$new_autosave['ID'] = $old_autosave->ID;
		$new_autosave['post_author'] = $post_author;

		// If the new autosave has the same content as the post, delete the autosave.
		$post = get_post( $post_id );
		$autosave_is_different = false;
		foreach ( array_intersect( array_keys( $new_autosave ), array_keys( _wp_post_revision_fields( $post ) ) ) as $field ) {
			if ( normalize_whitespace( $new_autosave[ $field ] ) != normalize_whitespace( $post->$field ) ) {
				$autosave_is_different = true;
				break;
			}
		}

		if ( ! $autosave_is_different ) {
			wp_delete_post_revision( $old_autosave->ID );
			return 0;
		}

		/**
		 * Fires before an autosave is stored.
		 *
		 * @since 4.1.0
		 *
		 * @param array $new_autosave Post array - the autosave that is about to be saved.
		 */
		do_action( 'wp_creating_autosave', $new_autosave );

		return wp_update_post( $new_autosave );
	}

	// _wp_put_post_revision() expects unescaped.
	$post_data = wp_unslash( $post_data );

	// Otherwise create the new autosave as a special post revision
	return _wp_put_post_revision( $post_data, true );
}

/**
 * Saves a draft or manually autosaves for the purpose of showing a post preview.
 *
 * @since 2.7.0
 *
 * @return string URL to redirect to show the preview.
 */
function post_preview() {

	$post_ID = (int) $_POST['post_ID'];
	$_POST['ID'] = $post_ID;

	if ( ! $post = get_post( $post_ID ) ) {
		wp_die( __( 'Sorry, you are not allowed to edit this post.' ) );
	}

	if ( ! current_user_can( 'edit_post', $post->ID ) ) {
		wp_die( __( 'Sorry, you are not allowed to edit this post.' ) );
	}

	$is_autosave = false;

	if ( ! wp_check_post_lock( $post->ID ) && get_current_user_id() == $post->post_author && ( 'draft' == $post->post_status || 'auto-draft' == $post->post_status ) ) {
		$saved_post_id = edit_post();
	} else {
		$is_autosave = true;

		if ( isset( $_POST['post_status'] ) && 'auto-draft' == $_POST['post_status'] )
			$_POST['post_status'] = 'draft';

		$saved_post_id = wp_create_post_autosave( $post->ID );
	}

	if ( is_wp_error( $saved_post_id ) )
		wp_die( $saved_post_id->get_error_message() );

	$query_args = array();

	if ( $is_autosave && $saved_post_id ) {
		$query_args['preview_id'] = $post->ID;
		$query_args['preview_nonce'] = wp_create_nonce( 'post_preview_' . $post->ID );

		if ( isset( $_POST['post_format'] ) ) {
			$query_args['post_format'] = empty( $_POST['post_format'] ) ? 'standard' : sanitize_key( $_POST['post_format'] );
		}

		if ( isset( $_POST['_thumbnail_id'] ) ) {
			$query_args['_thumbnail_id'] = ( intval( $_POST['_thumbnail_id'] ) <= 0 ) ? '-1' : intval( $_POST['_thumbnail_id'] );
		}
	}

	return get_preview_post_link( $post, $query_args );
}

/**
 * Save a post submitted with XHR
 *
 * Intended for use with heartbeat and autosave.js
 *
 * @since 3.9.0
 *
 * @param array $post_data Associative array of the submitted post data.
 * @return mixed The value 0 or WP_Error on failure. The saved post ID on success.
 *               The ID can be the draft post_id or the autosave revision post_id.
 */
function wp_autosave( $post_data ) {
	// Back-compat
	if ( ! defined( 'DOING_AUTOSAVE' ) )
		define( 'DOING_AUTOSAVE', true );

	$post_id = (int) $post_data['post_id'];
	$post_data['ID'] = $post_data['post_ID'] = $post_id;

	if ( false === wp_verify_nonce( $post_data['_wpnonce'], 'update-post_' . $post_id ) ) {
		return new WP_Error( 'invalid_nonce', __( 'Error while saving.' ) );
	}

	$post = get_post( $post_id );

	if ( ! current_user_can( 'edit_post', $post->ID ) ) {
		return new WP_Error( 'edit_posts', __( 'Sorry, you are not allowed to edit this item.' ) );
	}

	if ( 'auto-draft' == $post->post_status )
		$post_data['post_status'] = 'draft';

	if ( $post_data['post_type'] != 'page' && ! empty( $post_data['catslist'] ) )
		$post_data['post_category'] = explode( ',', $post_data['catslist'] );

	if ( ! wp_check_post_lock( $post->ID ) && get_current_user_id() == $post->post_author && ( 'auto-draft' == $post->post_status || 'draft' == $post->post_status ) ) {
		// Drafts and auto-drafts are just overwritten by autosave for the same user if the post is not locked
		return edit_post( wp_slash( $post_data ) );
	} else {
		// Non drafts or other users drafts are not overwritten. The autosave is stored in a special post revision for each user.
		return wp_create_post_autosave( wp_slash( $post_data ) );
	}
}

/**
 * Redirect to previous page.
 *
 * @param int $post_id Optional. Post ID.
 */
function redirect_post($post_id = '') {
	if ( isset($_POST['save']) || isset($_POST['publish']) ) {
		$status = get_post_status( $post_id );

		if ( isset( $_POST['publish'] ) ) {
			switch ( $status ) {
				case 'pending':
					$message = 8;
					break;
				case 'future':
					$message = 9;
					break;
				default:
					$message = 6;
			}
		} else {
			$message = 'draft' == $status ? 10 : 1;
		}

		$location = add_query_arg( 'message', $message, get_edit_post_link( $post_id, 'url' ) );
	} elseif ( isset($_POST['addmeta']) && $_POST['addmeta'] ) {
		$location = add_query_arg( 'message', 2, wp_get_referer() );
		$location = explode('#', $location);
		$location = $location[0] . '#postcustom';
	} elseif ( isset($_POST['deletemeta']) && $_POST['deletemeta'] ) {
		$location = add_query_arg( 'message', 3, wp_get_referer() );
		$location = explode('#', $location);
		$location = $location[0] . '#postcustom';
	} else {
		$location = add_query_arg( 'message', 4, get_edit_post_link( $post_id, 'url' ) );
	}

	/**
	 * Filters the post redirect destination URL.
	 *
	 * @since 2.9.0
	 *
	 * @param string $location The destination URL.
	 * @param int    $post_id  The post ID.
	 */
	wp_redirect( apply_filters( 'redirect_post_location', $location, $post_id ) );
	exit;
}

/**
 * Return whether the post can be edited in the block editor.
 *
 * @since 5.0.0
 *
 * @param int|WP_Post $post Post ID or WP_Post object.
 * @return bool Whether the post can be edited in the block editor.
 */
function use_block_editor_for_post( $post ) {
	$post = get_post( $post );

	if ( ! $post ) {
		return false;
	}

	// We're in the meta box loader, so don't use the block editor.
	if ( isset( $_GET['meta-box-loader'] ) ) {
		check_admin_referer( 'meta-box-loader' );
		return false;
	}

	// The posts page can't be edited in the block editor.
	if ( absint( get_option( 'page_for_posts' ) ) === $post->ID && empty( $post->post_content ) ) {
		return false;
	}

	$use_block_editor = use_block_editor_for_post_type( $post->post_type );

	/**
	 * Filter whether a post is able to be edited in the block editor.
	 *
	 * @since 5.0.0
	 *
	 * @param bool    $use_block_editor Whether the post can be edited or not.
	 * @param WP_Post $post             The post being checked.
	 */
	return apply_filters( 'use_block_editor_for_post', $use_block_editor, $post );
}

/**
 * Return whether a post type is compatible with the block editor.
 *
 * The block editor depends on the REST API, and if the post type is not shown in the
 * REST API, then it won't work with the block editor.
 *
 * @since 5.0.0
 *
 * @param string $post_type The post type.
 * @return bool Whether the post type can be edited with the block editor.
 */
function use_block_editor_for_post_type( $post_type ) {
	if ( ! post_type_exists( $post_type ) ) {
		return false;
	}

	if ( ! post_type_supports( $post_type, 'editor' ) ) {
		return false;
	}

	$post_type_object = get_post_type_object( $post_type );
	if ( $post_type_object && ! $post_type_object->show_in_rest ) {
		return false;
	}

	/**
	 * Filter whether a post is able to be edited in the block editor.
	 *
	 * @since 5.0.0
	 *
	 * @param bool   $use_block_editor  Whether the post type can be edited or not. Default true.
	 * @param string $post_type         The post type being checked.
	 */
	return apply_filters( 'use_block_editor_for_post_type', true, $post_type );
}

/**
 * Returns all the block categories that will be shown in the block editor.
 *
 * @since 5.0.0
 *
 * @param WP_Post $post Post object.
 * @return array Array of block categories.
 */
function get_block_categories( $post ) {
	$default_categories = array(
		array(
			'slug'  => 'common',
			'title' => __( 'Common Blocks' ),
			'icon'  => null,
		),
		array(
			'slug'  => 'formatting',
			'title' => __( 'Formatting' ),
			'icon'  => null,
		),
		array(
			'slug'  => 'layout',
			'title' => __( 'Layout Elements' ),
			'icon'  => null,
		),
		array(
			'slug'  => 'widgets',
			'title' => __( 'Widgets' ),
			'icon'  => null,
		),
		array(
			'slug'  => 'embed',
			'title' => __( 'Embeds' ),
			'icon'  => null,
		),
		array(
			'slug'  => 'reusable',
			'title' => __( 'Reusable Blocks' ),
			'icon'  => null,
		),
	);

	/**
	 * Filter the default array of block categories.
	 *
	 * @since 5.0.0
	 *
	 * @param array   $default_categories Array of block categories.
	 * @param WP_Post $post               Post being loaded.
	 */
	return apply_filters( 'block_categories', $default_categories, $post );
}

/**
 * Prepares server-registered blocks for the block editor.
 *
 * Returns an associative array of registered block data keyed by block name. Data includes properties
 * of a block relevant for client registration.
 *
 * @since 5.0.0
 *
 * @return array An associative array of registered block data.
 */
function get_block_editor_server_block_settings() {
	$block_registry = WP_Block_Type_Registry::get_instance();
	$blocks         = array();
	$keys_to_pick   = array( 'title', 'description', 'icon', 'category', 'keywords', 'supports', 'attributes' );

	foreach ( $block_registry->get_all_registered() as $block_name => $block_type ) {
		foreach ( $keys_to_pick as $key ) {
			if ( ! isset( $block_type->{ $key } ) ) {
				continue;
			}

			if ( ! isset( $blocks[ $block_name ] ) ) {
				$blocks[ $block_name ] = array();
			}

			$blocks[ $block_name ][ $key ] = $block_type->{ $key };
		}
	}

	return $blocks;
}

/**
 * Renders the meta boxes forms.
 *
 * @since 5.0.0
 */
function the_block_editor_meta_boxes() {
	global $post, $current_screen, $wp_meta_boxes;

	// Handle meta box state.
	$_original_meta_boxes = $wp_meta_boxes;

	/**
	 * Fires right before the meta boxes are rendered.
	 *
	 * This allows for the filtering of meta box data, that should already be
	 * present by this point. Do not use as a means of adding meta box data.
	 *
	 * @since 5.0.0
	 *
	 * @param array $wp_meta_boxes Global meta box state.
	 */
	$wp_meta_boxes = apply_filters( 'filter_block_editor_meta_boxes', $wp_meta_boxes );
	$locations     = array( 'side', 'normal', 'advanced' );
	$priorities    = array( 'high', 'sorted', 'core', 'default', 'low' );

	// Render meta boxes.
	?>
	<form class="metabox-base-form">
	<?php the_block_editor_meta_box_post_form_hidden_fields( $post ); ?>
	</form>
	<form id="toggle-custom-fields-form" method="post" action="<?php echo esc_attr( admin_url( 'post.php' ) ); ?>">
		<?php wp_nonce_field( 'toggle-custom-fields' ); ?>
		<input type="hidden" name="action" value="toggle-custom-fields" />
	</form>
	<?php foreach ( $locations as $location ) : ?>
		<form class="metabox-location-<?php echo esc_attr( $location ); ?>" onsubmit="return false;">
			<div id="poststuff" class="sidebar-open">
				<div id="postbox-container-2" class="postbox-container">
					<?php
					do_meta_boxes(
						$current_screen,
						$location,
						$post
					);
					?>
				</div>
			</div>
		</form>
	<?php endforeach; ?>
	<?php

	$meta_boxes_per_location = array();
	foreach ( $locations as $location ) {
		$meta_boxes_per_location[ $location ] = array();

		if ( ! isset( $wp_meta_boxes[ $current_screen->id ][ $location ] ) ) {
			continue;
		}

		foreach ( $priorities as $priority ) {
			if ( ! isset( $wp_meta_boxes[ $current_screen->id ][ $location ][ $priority ] ) ) {
				continue;
			}

			$meta_boxes = (array) $wp_meta_boxes[ $current_screen->id ][ $location ][ $priority ];
			foreach ( $meta_boxes as $meta_box ) {
				if ( false == $meta_box || ! $meta_box['title'] ) {
					continue;
				}

				// If a meta box is just here for back compat, don't show it in the block editor.
				if ( isset( $meta_box['args']['__back_compat_meta_box'] ) && $meta_box['args']['__back_compat_meta_box'] ) {
					continue;
				}

				$meta_boxes_per_location[ $location ][] = array(
					'id'    => $meta_box['id'],
					'title' => $meta_box['title'],
				);
			}
		}
	}

	/**
	 * Sadly we probably can not add this data directly into editor settings.
	 *
	 * Some meta boxes need admin_head to fire for meta box registry.
	 * admin_head fires after admin_enqueue_scripts, which is where we create our
	 * editor instance.
	 */
	$script = 'window._wpLoadBlockEditor.then( function() {
		wp.data.dispatch( \'core/edit-post\' ).setAvailableMetaBoxesPerLocation( ' . wp_json_encode( $meta_boxes_per_location ) . ' );
	} );';

	wp_add_inline_script( 'wp-edit-post', $script );

	/**
	 * When `wp-edit-post` is output in the `<head>`, the inline script needs to be manually printed. Otherwise,
	 * meta boxes will not display because inline scripts for `wp-edit-post` will not be printed again after this point.
	 */
	if ( wp_script_is( 'wp-edit-post', 'done' ) ) {
		printf( "<script type='text/javascript'>\n%s\n</script>\n", trim( $script ) );
	}

	/**
	 * If the 'postcustom' meta box is enabled, then we need to perform some
	 * extra initialization on it.
	 */
	$enable_custom_fields = (bool) get_user_meta( get_current_user_id(), 'enable_custom_fields', true );
	if ( $enable_custom_fields ) {
		$script = "( function( $ ) {
			if ( $('#postcustom').length ) {
				$( '#the-list' ).wpList( {
					addBefore: function( s ) {
						s.data += '&post_id=$post->ID';
						return s;
					},
					addAfter: function() {
						$('table#list-table').show();
					}
				});
			}
		} )( jQuery );";
 		wp_enqueue_script( 'wp-lists' );
		wp_add_inline_script( 'wp-lists', $script );
	}

	// Reset meta box data.
	$wp_meta_boxes = $_original_meta_boxes;
}

/**
 * Renders the hidden form required for the meta boxes form.
 *
 * @since 5.0.0
 *
 * @param WP_Post $post Current post object.
 */
function the_block_editor_meta_box_post_form_hidden_fields( $post ) {
	$form_extra = '';
	if ( 'auto-draft' === $post->post_status ) {
		$form_extra .= "<input type='hidden' id='auto_draft' name='auto_draft' value='1' />";
	}
	$form_action  = 'editpost';
	$nonce_action = 'update-post_' . $post->ID;
	$form_extra  .= "<input type='hidden' id='post_ID' name='post_ID' value='" . esc_attr( $post->ID ) . "' />";
	$referer      = wp_get_referer();
	$current_user = wp_get_current_user();
	$user_id      = $current_user->ID;
	wp_nonce_field( $nonce_action );

	/*
	 * Some meta boxes hook into these actions to add hidden input fields in the classic post form. For backwards
	 * compatibility, we can capture the output from these actions, and extract the hidden input fields.
	 */
	ob_start();
	/** This filter is documented in wp-admin/edit-form-advanced.php */
	do_action( 'edit_form_after_title', $post );
	/** This filter is documented in wp-admin/edit-form-advanced.php */
	do_action( 'edit_form_advanced', $post );
	$classic_output = ob_get_clean();

	$classic_elements = wp_html_split( $classic_output );
	$hidden_inputs    = '';
	foreach( $classic_elements as $element ) {
		if ( 0 !== strpos( $element, '<input ') ) {
			continue;
		}

		if ( preg_match( '/\stype=[\'"]hidden[\'"]\s/', $element ) ) {
			echo $element;
		}
	}
	?>
	<input type="hidden" id="user-id" name="user_ID" value="<?php echo (int) $user_id; ?>" />
	<input type="hidden" id="hiddenaction" name="action" value="<?php echo esc_attr( $form_action ); ?>" />
	<input type="hidden" id="originalaction" name="originalaction" value="<?php echo esc_attr( $form_action ); ?>" />
	<input type="hidden" id="post_type" name="post_type" value="<?php echo esc_attr( $post->post_type ); ?>" />
	<input type="hidden" id="original_post_status" name="original_post_status" value="<?php echo esc_attr( $post->post_status ); ?>" />
	<input type="hidden" id="referredby" name="referredby" value="<?php echo $referer ? esc_url( $referer ) : ''; ?>" />

	<?php
	if ( 'draft' !== get_post_status( $post ) ) {
		wp_original_referer_field( true, 'previous' );
	}
	echo $form_extra;
	wp_nonce_field( 'meta-box-order', 'meta-box-order-nonce', false );
	wp_nonce_field( 'closedpostboxes', 'closedpostboxesnonce', false );
	// Permalink title nonce.
	wp_nonce_field( 'samplepermalink', 'samplepermalinknonce', false );

	/**
	 * Add hidden input fields to the meta box save form.
	 *
	 * Hook into this action to print `<input type="hidden" ... />` fields, which will be POSTed back to
	 * the server when meta boxes are saved.
	 *
	 * @since 5.0.0
	 *
	 * @params WP_Post $post The post that is being edited.
	 */
	do_action( 'block_editor_meta_box_hidden_fields', $post );
}
home/xbodynamge/crosstraining/wp-includes/post.php000064400000673737151130734610016476 0ustar00<?php
/**
 * Core Post API
 *
 * @package WordPress
 * @subpackage Post
 */

//
// Post Type Registration
//

/**
 * Creates the initial post types when 'init' action is fired.
 *
 * See {@see 'init'}.
 *
 * @since 2.9.0
 */
function create_initial_post_types() {
	register_post_type( 'post', array(
		'labels' => array(
			'name_admin_bar' => _x( 'Post', 'add new from admin bar' ),
		),
		'public'  => true,
		'_builtin' => true, /* internal use only. don't use this when registering your own post type. */
		'_edit_link' => 'post.php?post=%d', /* internal use only. don't use this when registering your own post type. */
		'capability_type' => 'post',
		'map_meta_cap' => true,
		'menu_position' => 5,
		'hierarchical' => false,
		'rewrite' => false,
		'query_var' => false,
		'delete_with_user' => true,
		'supports' => array( 'title', 'editor', 'author', 'thumbnail', 'excerpt', 'trackbacks', 'custom-fields', 'comments', 'revisions', 'post-formats' ),
		'show_in_rest' => true,
		'rest_base' => 'posts',
		'rest_controller_class' => 'WP_REST_Posts_Controller',
	) );

	register_post_type( 'page', array(
		'labels' => array(
			'name_admin_bar' => _x( 'Page', 'add new from admin bar' ),
		),
		'public' => true,
		'publicly_queryable' => false,
		'_builtin' => true, /* internal use only. don't use this when registering your own post type. */
		'_edit_link' => 'post.php?post=%d', /* internal use only. don't use this when registering your own post type. */
		'capability_type' => 'page',
		'map_meta_cap' => true,
		'menu_position' => 20,
		'hierarchical' => true,
		'rewrite' => false,
		'query_var' => false,
		'delete_with_user' => true,
		'supports' => array( 'title', 'editor', 'author', 'thumbnail', 'page-attributes', 'custom-fields', 'comments', 'revisions' ),
		'show_in_rest' => true,
		'rest_base' => 'pages',
		'rest_controller_class' => 'WP_REST_Posts_Controller',
	) );

	register_post_type( 'attachment', array(
		'labels' => array(
			'name' => _x('Media', 'post type general name'),
			'name_admin_bar' => _x( 'Media', 'add new from admin bar' ),
			'add_new' => _x( 'Add New', 'add new media' ),
 			'edit_item' => __( 'Edit Media' ),
 			'view_item' => __( 'View Attachment Page' ),
			'attributes' => __( 'Attachment Attributes' ),
		),
		'public' => true,
		'show_ui' => true,
		'_builtin' => true, /* internal use only. don't use this when registering your own post type. */
		'_edit_link' => 'post.php?post=%d', /* internal use only. don't use this when registering your own post type. */
		'capability_type' => 'post',
		'capabilities' => array(
			'create_posts' => 'upload_files',
		),
		'map_meta_cap' => true,
		'hierarchical' => false,
		'rewrite' => false,
		'query_var' => false,
		'show_in_nav_menus' => false,
		'delete_with_user' => true,
		'supports' => array( 'title', 'author', 'comments' ),
		'show_in_rest' => true,
		'rest_base' => 'media',
		'rest_controller_class' => 'WP_REST_Attachments_Controller',
	) );
	add_post_type_support( 'attachment:audio', 'thumbnail' );
	add_post_type_support( 'attachment:video', 'thumbnail' );

	register_post_type( 'revision', array(
		'labels' => array(
			'name' => __( 'Revisions' ),
			'singular_name' => __( 'Revision' ),
		),
		'public' => false,
		'_builtin' => true, /* internal use only. don't use this when registering your own post type. */
		'_edit_link' => 'revision.php?revision=%d', /* internal use only. don't use this when registering your own post type. */
		'capability_type' => 'post',
		'map_meta_cap' => true,
		'hierarchical' => false,
		'rewrite' => false,
		'query_var' => false,
		'can_export' => false,
		'delete_with_user' => true,
		'supports' => array( 'author' ),
	) );

	register_post_type( 'nav_menu_item', array(
		'labels' => array(
			'name' => __( 'Navigation Menu Items' ),
			'singular_name' => __( 'Navigation Menu Item' ),
		),
		'public' => false,
		'_builtin' => true, /* internal use only. don't use this when registering your own post type. */
		'hierarchical' => false,
		'rewrite' => false,
		'delete_with_user' => false,
		'query_var' => false,
	) );

	register_post_type( 'custom_css', array(
		'labels' => array(
			'name'          => __( 'Custom CSS' ),
			'singular_name' => __( 'Custom CSS' ),
		),
		'public'           => false,
		'hierarchical'     => false,
		'rewrite'          => false,
		'query_var'        => false,
		'delete_with_user' => false,
		'can_export'       => true,
		'_builtin'         => true, /* internal use only. don't use this when registering your own post type. */
		'supports'         => array( 'title', 'revisions' ),
		'capabilities'     => array(
			'delete_posts'           => 'edit_theme_options',
			'delete_post'            => 'edit_theme_options',
			'delete_published_posts' => 'edit_theme_options',
			'delete_private_posts'   => 'edit_theme_options',
			'delete_others_posts'    => 'edit_theme_options',
			'edit_post'              => 'edit_css',
			'edit_posts'             => 'edit_css',
			'edit_others_posts'      => 'edit_css',
			'edit_published_posts'   => 'edit_css',
			'read_post'              => 'read',
			'read_private_posts'     => 'read',
			'publish_posts'          => 'edit_theme_options',
		),
	) );

	register_post_type( 'customize_changeset', array(
		'labels' => array(
			'name'               => _x( 'Changesets', 'post type general name' ),
			'singular_name'      => _x( 'Changeset', 'post type singular name' ),
			'menu_name'          => _x( 'Changesets', 'admin menu' ),
			'name_admin_bar'     => _x( 'Changeset', 'add new on admin bar' ),
			'add_new'            => _x( 'Add New', 'Customize Changeset' ),
			'add_new_item'       => __( 'Add New Changeset' ),
			'new_item'           => __( 'New Changeset' ),
			'edit_item'          => __( 'Edit Changeset' ),
			'view_item'          => __( 'View Changeset' ),
			'all_items'          => __( 'All Changesets' ),
			'search_items'       => __( 'Search Changesets' ),
			'not_found'          => __( 'No changesets found.' ),
			'not_found_in_trash' => __( 'No changesets found in Trash.' ),
		),
		'public' => false,
		'_builtin' => true, /* internal use only. don't use this when registering your own post type. */
		'map_meta_cap' => true,
		'hierarchical' => false,
		'rewrite' => false,
		'query_var' => false,
		'can_export' => false,
		'delete_with_user' => false,
		'supports' => array( 'title', 'author' ),
		'capability_type' => 'customize_changeset',
		'capabilities' => array(
			'create_posts' => 'customize',
			'delete_others_posts' => 'customize',
			'delete_post' => 'customize',
			'delete_posts' => 'customize',
			'delete_private_posts' => 'customize',
			'delete_published_posts' => 'customize',
			'edit_others_posts' => 'customize',
			'edit_post' => 'customize',
			'edit_posts' => 'customize',
			'edit_private_posts' => 'customize',
			'edit_published_posts' => 'do_not_allow',
			'publish_posts' => 'customize',
			'read' => 'read',
			'read_post' => 'customize',
			'read_private_posts' => 'customize',
		),
	) );

	register_post_type( 'oembed_cache', array(
		'labels' => array(
			'name'          => __( 'oEmbed Responses' ),
			'singular_name' => __( 'oEmbed Response' ),
		),
		'public'           => false,
		'hierarchical'     => false,
		'rewrite'          => false,
		'query_var'        => false,
		'delete_with_user' => false,
		'can_export'       => false,
		'_builtin'         => true, /* internal use only. don't use this when registering your own post type. */
		'supports'         => array(),
	) );

	register_post_type( 'user_request', array(
		'labels'           => array(
			'name'          => __( 'User Requests' ),
			'singular_name' => __( 'User Request' ),
		),
		'public'           => false,
		'_builtin'         => true, /* internal use only. don't use this when registering your own post type. */
		'hierarchical'     => false,
		'rewrite'          => false,
		'query_var'        => false,
		'can_export'       => false,
		'delete_with_user' => false,
		'supports'         => array(),
	) );

	register_post_type(
		'wp_block',
		array(
			'labels'                => array(
				'name'                     => _x( 'Blocks', 'post type general name' ),
				'singular_name'            => _x( 'Block', 'post type singular name' ),
				'menu_name'                => _x( 'Blocks', 'admin menu' ),
				'name_admin_bar'           => _x( 'Block', 'add new on admin bar' ),
				'add_new'                  => _x( 'Add New', 'Block' ),
				'add_new_item'             => __( 'Add New Block' ),
				'new_item'                 => __( 'New Block' ),
				'edit_item'                => __( 'Edit Block' ),
				'view_item'                => __( 'View Block' ),
				'all_items'                => __( 'All Blocks' ),
				'search_items'             => __( 'Search Blocks' ),
				'not_found'                => __( 'No blocks found.' ),
				'not_found_in_trash'       => __( 'No blocks found in Trash.' ),
				'filter_items_list'        => __( 'Filter blocks list' ),
				'items_list_navigation'    => __( 'Blocks list navigation' ),
				'items_list'               => __( 'Blocks list' ),
				'item_published'           => __( 'Block published.' ),
				'item_published_privately' => __( 'Block published privately.' ),
				'item_reverted_to_draft'   => __( 'Block reverted to draft.' ),
				'item_scheduled'           => __( 'Block scheduled.' ),
				'item_updated'             => __( 'Block updated.' ),
			),
			'public'                => false,
			'_builtin'              => true, /* internal use only. don't use this when registering your own post type. */
			'show_ui'               => true,
			'show_in_menu'          => false,
			'rewrite'               => false,
			'show_in_rest'          => true,
			'rest_base'             => 'blocks',
			'rest_controller_class' => 'WP_REST_Blocks_Controller',
			'capability_type'       => 'block',
			'capabilities'          => array(
				// You need to be able to edit posts, in order to read blocks in their raw form.
				'read'                   => 'edit_posts',
				// You need to be able to publish posts, in order to create blocks.
				'create_posts'           => 'publish_posts',
				'edit_published_posts'   => 'edit_published_posts',
				'delete_published_posts' => 'delete_published_posts',
				'edit_others_posts'      => 'edit_others_posts',
				'delete_others_posts'    => 'delete_others_posts',
			),
			'map_meta_cap'          => true,
			'supports'              => array(
				'title',
				'editor',
			),
		)
	);


	register_post_status( 'publish', array(
		'label'       => _x( 'Published', 'post status' ),
		'public'      => true,
		'_builtin'    => true, /* internal use only. */
		'label_count' => _n_noop( 'Published <span class="count">(%s)</span>', 'Published <span class="count">(%s)</span>' ),
	) );

	register_post_status( 'future', array(
		'label'       => _x( 'Scheduled', 'post status' ),
		'protected'   => true,
		'_builtin'    => true, /* internal use only. */
		'label_count' => _n_noop('Scheduled <span class="count">(%s)</span>', 'Scheduled <span class="count">(%s)</span>' ),
	) );

	register_post_status( 'draft', array(
		'label'       => _x( 'Draft', 'post status' ),
		'protected'   => true,
		'_builtin'    => true, /* internal use only. */
		'label_count' => _n_noop( 'Draft <span class="count">(%s)</span>', 'Drafts <span class="count">(%s)</span>' ),
	) );

	register_post_status( 'pending', array(
		'label'       => _x( 'Pending', 'post status' ),
		'protected'   => true,
		'_builtin'    => true, /* internal use only. */
		'label_count' => _n_noop( 'Pending <span class="count">(%s)</span>', 'Pending <span class="count">(%s)</span>' ),
	) );

	register_post_status( 'private', array(
		'label'       => _x( 'Private', 'post status' ),
		'private'     => true,
		'_builtin'    => true, /* internal use only. */
		'label_count' => _n_noop( 'Private <span class="count">(%s)</span>', 'Private <span class="count">(%s)</span>' ),
	) );

	register_post_status( 'trash', array(
		'label'       => _x( 'Trash', 'post status' ),
		'internal'    => true,
		'_builtin'    => true, /* internal use only. */
		'label_count' => _n_noop( 'Trash <span class="count">(%s)</span>', 'Trash <span class="count">(%s)</span>' ),
		'show_in_admin_status_list' => true,
	) );

	register_post_status( 'auto-draft', array(
		'label'    => 'auto-draft',
		'internal' => true,
		'_builtin' => true, /* internal use only. */
	) );

	register_post_status( 'inherit', array(
		'label'    => 'inherit',
		'internal' => true,
		'_builtin' => true, /* internal use only. */
		'exclude_from_search' => false,
	) );

	register_post_status( 'request-pending', array(
		'label'               => _x( 'Pending', 'request status' ),
		'internal'            => true,
		'_builtin'            => true, /* internal use only. */
		'exclude_from_search' => false,
	) );

	register_post_status( 'request-confirmed', array(
		'label'               => _x( 'Confirmed', 'request status' ),
		'internal'            => true,
		'_builtin'            => true, /* internal use only. */
		'exclude_from_search' => false,
	) );

	register_post_status( 'request-failed', array(
		'label'               => _x( 'Failed', 'request status' ),
		'internal'            => true,
		'_builtin'            => true, /* internal use only. */
		'exclude_from_search' => false,
	) );

	register_post_status( 'request-completed', array(
		'label'               => _x( 'Completed', 'request status' ),
		'internal'            => true,
		'_builtin'            => true, /* internal use only. */
		'exclude_from_search' => false,
	) );
}

/**
 * Retrieve attached file path based on attachment ID.
 *
 * By default the path will go through the 'get_attached_file' filter, but
 * passing a true to the $unfiltered argument of get_attached_file() will
 * return the file path unfiltered.
 *
 * The function works by getting the single post meta name, named
 * '_wp_attached_file' and returning it. This is a convenience function to
 * prevent looking up the meta name and provide a mechanism for sending the
 * attached filename through a filter.
 *
 * @since 2.0.0
 *
 * @param int  $attachment_id Attachment ID.
 * @param bool $unfiltered    Optional. Whether to apply filters. Default false.
 * @return string|false The file path to where the attached file should be, false otherwise.
 */
function get_attached_file( $attachment_id, $unfiltered = false ) {
	$file = get_post_meta( $attachment_id, '_wp_attached_file', true );

	// If the file is relative, prepend upload dir.
	if ( $file && 0 !== strpos( $file, '/' ) && ! preg_match( '|^.:\\\|', $file ) && ( ( $uploads = wp_get_upload_dir() ) && false === $uploads['error'] ) ) {
		$file = $uploads['basedir'] . "/$file";
	}

	if ( $unfiltered ) {
		return $file;
	}

	/**
	 * Filters the attached file based on the given ID.
	 *
	 * @since 2.1.0
	 *
	 * @param string $file          Path to attached file.
	 * @param int    $attachment_id Attachment ID.
	 */
	return apply_filters( 'get_attached_file', $file, $attachment_id );
}

/**
 * Update attachment file path based on attachment ID.
 *
 * Used to update the file path of the attachment, which uses post meta name
 * '_wp_attached_file' to store the path of the attachment.
 *
 * @since 2.1.0
 *
 * @param int    $attachment_id Attachment ID.
 * @param string $file          File path for the attachment.
 * @return bool True on success, false on failure.
 */
function update_attached_file( $attachment_id, $file ) {
	if ( !get_post( $attachment_id ) )
		return false;

	/**
	 * Filters the path to the attached file to update.
	 *
	 * @since 2.1.0
	 *
	 * @param string $file          Path to the attached file to update.
	 * @param int    $attachment_id Attachment ID.
	 */
	$file = apply_filters( 'update_attached_file', $file, $attachment_id );

	if ( $file = _wp_relative_upload_path( $file ) )
		return update_post_meta( $attachment_id, '_wp_attached_file', $file );
	else
		return delete_post_meta( $attachment_id, '_wp_attached_file' );
}

/**
 * Return relative path to an uploaded file.
 *
 * The path is relative to the current upload dir.
 *
 * @since 2.9.0
 *
 * @param string $path Full path to the file.
 * @return string Relative path on success, unchanged path on failure.
 */
function _wp_relative_upload_path( $path ) {
	$new_path = $path;

	$uploads = wp_get_upload_dir();
	if ( 0 === strpos( $new_path, $uploads['basedir'] ) ) {
			$new_path = str_replace( $uploads['basedir'], '', $new_path );
			$new_path = ltrim( $new_path, '/' );
	}

	/**
	 * Filters the relative path to an uploaded file.
	 *
	 * @since 2.9.0
	 *
	 * @param string $new_path Relative path to the file.
	 * @param string $path     Full path to the file.
	 */
	return apply_filters( '_wp_relative_upload_path', $new_path, $path );
}

/**
 * Retrieve all children of the post parent ID.
 *
 * Normally, without any enhancements, the children would apply to pages. In the
 * context of the inner workings of WordPress, pages, posts, and attachments
 * share the same table, so therefore the functionality could apply to any one
 * of them. It is then noted that while this function does not work on posts, it
 * does not mean that it won't work on posts. It is recommended that you know
 * what context you wish to retrieve the children of.
 *
 * Attachments may also be made the child of a post, so if that is an accurate
 * statement (which needs to be verified), it would then be possible to get
 * all of the attachments for a post. Attachments have since changed since
 * version 2.5, so this is most likely inaccurate, but serves generally as an
 * example of what is possible.
 *
 * The arguments listed as defaults are for this function and also of the
 * get_posts() function. The arguments are combined with the get_children defaults
 * and are then passed to the get_posts() function, which accepts additional arguments.
 * You can replace the defaults in this function, listed below and the additional
 * arguments listed in the get_posts() function.
 *
 * The 'post_parent' is the most important argument and important attention
 * needs to be paid to the $args parameter. If you pass either an object or an
 * integer (number), then just the 'post_parent' is grabbed and everything else
 * is lost. If you don't specify any arguments, then it is assumed that you are
 * in The Loop and the post parent will be grabbed for from the current post.
 *
 * The 'post_parent' argument is the ID to get the children. The 'numberposts'
 * is the amount of posts to retrieve that has a default of '-1', which is
 * used to get all of the posts. Giving a number higher than 0 will only
 * retrieve that amount of posts.
 *
 * The 'post_type' and 'post_status' arguments can be used to choose what
 * criteria of posts to retrieve. The 'post_type' can be anything, but WordPress
 * post types are 'post', 'pages', and 'attachments'. The 'post_status'
 * argument will accept any post status within the write administration panels.
 *
 * @since 2.0.0
 *
 * @see get_posts()
 * @todo Check validity of description.
 *
 * @global WP_Post $post
 *
 * @param mixed  $args   Optional. User defined arguments for replacing the defaults. Default empty.
 * @param string $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
 *                       a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
 * @return array Array of children, where the type of each element is determined by $output parameter.
 *               Empty array on failure.
 */
function get_children( $args = '', $output = OBJECT ) {
	$kids = array();
	if ( empty( $args ) ) {
		if ( isset( $GLOBALS['post'] ) ) {
			$args = array('post_parent' => (int) $GLOBALS['post']->post_parent );
		} else {
			return $kids;
		}
	} elseif ( is_object( $args ) ) {
		$args = array('post_parent' => (int) $args->post_parent );
	} elseif ( is_numeric( $args ) ) {
		$args = array('post_parent' => (int) $args);
	}

	$defaults = array(
		'numberposts' => -1, 'post_type' => 'any',
		'post_status' => 'any', 'post_parent' => 0,
	);

	$r = wp_parse_args( $args, $defaults );

	$children = get_posts( $r );

	if ( ! $children )
		return $kids;

	if ( ! empty( $r['fields'] ) )
		return $children;

	update_post_cache($children);

	foreach ( $children as $key => $child )
		$kids[$child->ID] = $children[$key];

	if ( $output == OBJECT ) {
		return $kids;
	} elseif ( $output == ARRAY_A ) {
		$weeuns = array();
		foreach ( (array) $kids as $kid ) {
			$weeuns[$kid->ID] = get_object_vars($kids[$kid->ID]);
		}
		return $weeuns;
	} elseif ( $output == ARRAY_N ) {
		$babes = array();
		foreach ( (array) $kids as $kid ) {
			$babes[$kid->ID] = array_values(get_object_vars($kids[$kid->ID]));
		}
		return $babes;
	} else {
		return $kids;
	}
}

/**
 * Get extended entry info (<!--more-->).
 *
 * There should not be any space after the second dash and before the word
 * 'more'. There can be text or space(s) after the word 'more', but won't be
 * referenced.
 *
 * The returned array has 'main', 'extended', and 'more_text' keys. Main has the text before
 * the `<!--more-->`. The 'extended' key has the content after the
 * `<!--more-->` comment. The 'more_text' key has the custom "Read More" text.
 *
 * @since 1.0.0
 *
 * @param string $post Post content.
 * @return array Post before ('main'), after ('extended'), and custom read more ('more_text').
 */
function get_extended( $post ) {
	//Match the new style more links.
	if ( preg_match('/<!--more(.*?)?-->/', $post, $matches) ) {
		list($main, $extended) = explode($matches[0], $post, 2);
		$more_text = $matches[1];
	} else {
		$main = $post;
		$extended = '';
		$more_text = '';
	}

	//  leading and trailing whitespace.
	$main = preg_replace('/^[\s]*(.*)[\s]*$/', '\\1', $main);
	$extended = preg_replace('/^[\s]*(.*)[\s]*$/', '\\1', $extended);
	$more_text = preg_replace('/^[\s]*(.*)[\s]*$/', '\\1', $more_text);

	return array( 'main' => $main, 'extended' => $extended, 'more_text' => $more_text );
}

/**
 * Retrieves post data given a post ID or post object.
 *
 * See sanitize_post() for optional $filter values. Also, the parameter
 * `$post`, must be given as a variable, since it is passed by reference.
 *
 * @since 1.5.1
 *
 * @global WP_Post $post
 *
 * @param int|WP_Post|null $post   Optional. Post ID or post object. Defaults to global $post.
 * @param string           $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
 *                                 a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
 * @param string           $filter Optional. Type of filter to apply. Accepts 'raw', 'edit', 'db',
 *                                 or 'display'. Default 'raw'.
 * @return WP_Post|array|null Type corresponding to $output on success or null on failure.
 *                            When $output is OBJECT, a `WP_Post` instance is returned.
 */
function get_post( $post = null, $output = OBJECT, $filter = 'raw' ) {
	if ( empty( $post ) && isset( $GLOBALS['post'] ) )
		$post = $GLOBALS['post'];

	if ( $post instanceof WP_Post ) {
		$_post = $post;
	} elseif ( is_object( $post ) ) {
		if ( empty( $post->filter ) ) {
			$_post = sanitize_post( $post, 'raw' );
			$_post = new WP_Post( $_post );
		} elseif ( 'raw' == $post->filter ) {
			$_post = new WP_Post( $post );
		} else {
			$_post = WP_Post::get_instance( $post->ID );
		}
	} else {
		$_post = WP_Post::get_instance( $post );
	}

	if ( ! $_post )
		return null;

	$_post = $_post->filter( $filter );

	if ( $output == ARRAY_A )
		return $_post->to_array();
	elseif ( $output == ARRAY_N )
		return array_values( $_post->to_array() );

	return $_post;
}

/**
 * Retrieve ancestors of a post.
 *
 * @since 2.5.0
 *
 * @param int|WP_Post $post Post ID or post object.
 * @return array Ancestor IDs or empty array if none are found.
 */
function get_post_ancestors( $post ) {
	$post = get_post( $post );

	if ( ! $post || empty( $post->post_parent ) || $post->post_parent == $post->ID )
		return array();

	$ancestors = array();

	$id = $ancestors[] = $post->post_parent;

	while ( $ancestor = get_post( $id ) ) {
		// Loop detection: If the ancestor has been seen before, break.
		if ( empty( $ancestor->post_parent ) || ( $ancestor->post_parent == $post->ID ) || in_array( $ancestor->post_parent, $ancestors ) )
			break;

		$id = $ancestors[] = $ancestor->post_parent;
	}

	return $ancestors;
}

/**
 * Retrieve data from a post field based on Post ID.
 *
 * Examples of the post field will be, 'post_type', 'post_status', 'post_content',
 * etc and based off of the post object property or key names.
 *
 * The context values are based off of the taxonomy filter functions and
 * supported values are found within those functions.
 *
 * @since 2.3.0
 * @since 4.5.0 The `$post` parameter was made optional.
 *
 * @see sanitize_post_field()
 *
 * @param string      $field   Post field name.
 * @param int|WP_Post $post    Optional. Post ID or post object. Defaults to current post.
 * @param string      $context Optional. How to filter the field. Accepts 'raw', 'edit', 'db',
 *                             or 'display'. Default 'display'.
 * @return string The value of the post field on success, empty string on failure.
 */
function get_post_field( $field, $post = null, $context = 'display' ) {
	$post = get_post( $post );

	if ( !$post )
		return '';

	if ( !isset($post->$field) )
		return '';

	return sanitize_post_field($field, $post->$field, $post->ID, $context);
}

/**
 * Retrieve the mime type of an attachment based on the ID.
 *
 * This function can be used with any post type, but it makes more sense with
 * attachments.
 *
 * @since 2.0.0
 *
 * @param int|WP_Post $ID Optional. Post ID or post object. Default empty.
 * @return string|false The mime type on success, false on failure.
 */
function get_post_mime_type( $ID = '' ) {
	$post = get_post($ID);

	if ( is_object($post) )
		return $post->post_mime_type;

	return false;
}

/**
 * Retrieve the post status based on the Post ID.
 *
 * If the post ID is of an attachment, then the parent post status will be given
 * instead.
 *
 * @since 2.0.0
 *
 * @param int|WP_Post $ID Optional. Post ID or post object. Default empty.
 * @return string|false Post status on success, false on failure.
 */
function get_post_status( $ID = '' ) {
	$post = get_post($ID);

	if ( !is_object($post) )
		return false;

	if ( 'attachment' == $post->post_type ) {
		if ( 'private' == $post->post_status )
			return 'private';

		// Unattached attachments are assumed to be published.
		if ( ( 'inherit' == $post->post_status ) && ( 0 == $post->post_parent) )
			return 'publish';

		// Inherit status from the parent.
		if ( $post->post_parent && ( $post->ID != $post->post_parent ) ) {
			$parent_post_status = get_post_status( $post->post_parent );
			if ( 'trash' == $parent_post_status ) {
				return get_post_meta( $post->post_parent, '_wp_trash_meta_status', true );
			} else {
				return $parent_post_status;
			}
		}

	}

	/**
	 * Filters the post status.
	 *
	 * @since 4.4.0
	 *
	 * @param string  $post_status The post status.
	 * @param WP_Post $post        The post object.
	 */
	return apply_filters( 'get_post_status', $post->post_status, $post );
}

/**
 * Retrieve all of the WordPress supported post statuses.
 *
 * Posts have a limited set of valid status values, this provides the
 * post_status values and descriptions.
 *
 * @since 2.5.0
 *
 * @return array List of post statuses.
 */
function get_post_statuses() {
	$status = array(
		'draft'   => __( 'Draft' ),
		'pending' => __( 'Pending Review' ),
		'private' => __( 'Private' ),
		'publish' => __( 'Published' )
	);

	return $status;
}

/**
 * Retrieve all of the WordPress support page statuses.
 *
 * Pages have a limited set of valid status values, this provides the
 * post_status values and descriptions.
 *
 * @since 2.5.0
 *
 * @return array List of page statuses.
 */
function get_page_statuses() {
	$status = array(
		'draft'   => __( 'Draft' ),
		'private' => __( 'Private' ),
		'publish' => __( 'Published' )
	);

	return $status;
}

/**
 * Return statuses for privacy requests.
 *
 * @since 4.9.6
 *
 * @return array
 */
function _wp_privacy_statuses() {
	return array(
		'request-pending'   => __( 'Pending' ),      // Pending confirmation from user.
		'request-confirmed' => __( 'Confirmed' ),    // User has confirmed the action.
		'request-failed'    => __( 'Failed' ),       // User failed to confirm the action.
		'request-completed' => __( 'Completed' ),    // Admin has handled the request.
	);
}

/**
 * Register a post status. Do not use before init.
 *
 * A simple function for creating or modifying a post status based on the
 * parameters given. The function will accept an array (second optional
 * parameter), along with a string for the post status name.
 *
 * Arguments prefixed with an _underscore shouldn't be used by plugins and themes.
 *
 * @since 3.0.0
 * @global array $wp_post_statuses Inserts new post status object into the list
 *
 * @param string $post_status Name of the post status.
 * @param array|string $args {
 *     Optional. Array or string of post status arguments.
 *
 *     @type bool|string $label                     A descriptive name for the post status marked
 *                                                  for translation. Defaults to value of $post_status.
 *     @type bool|array  $label_count               Descriptive text to use for nooped plurals.
 *                                                  Default array of $label, twice
 *     @type bool        $exclude_from_search       Whether to exclude posts with this post status
 *                                                  from search results. Default is value of $internal.
 *     @type bool        $_builtin                  Whether the status is built-in. Core-use only.
 *                                                  Default false.
 *     @type bool        $public                    Whether posts of this status should be shown
 *                                                  in the front end of the site. Default false.
 *     @type bool        $internal                  Whether the status is for internal use only.
 *                                                  Default false.
 *     @type bool        $protected                 Whether posts with this status should be protected.
 *                                                  Default false.
 *     @type bool        $private                   Whether posts with this status should be private.
 *                                                  Default false.
 *     @type bool        $publicly_queryable        Whether posts with this status should be publicly-
 *                                                  queryable. Default is value of $public.
 *     @type bool        $show_in_admin_all_list    Whether to include posts in the edit listing for
 *                                                  their post type. Default is value of $internal.
 *     @type bool        $show_in_admin_status_list Show in the list of statuses with post counts at
 *                                                  the top of the edit listings,
 *                                                  e.g. All (12) | Published (9) | My Custom Status (2)
 *                                                  Default is value of $internal.
 * }
 * @return object
 */
function register_post_status( $post_status, $args = array() ) {
	global $wp_post_statuses;

	if (!is_array($wp_post_statuses))
		$wp_post_statuses = array();

	// Args prefixed with an underscore are reserved for internal use.
	$defaults = array(
		'label' => false,
		'label_count' => false,
		'exclude_from_search' => null,
		'_builtin' => false,
		'public' => null,
		'internal' => null,
		'protected' => null,
		'private' => null,
		'publicly_queryable' => null,
		'show_in_admin_status_list' => null,
		'show_in_admin_all_list' => null,
	);
	$args = wp_parse_args($args, $defaults);
	$args = (object) $args;

	$post_status = sanitize_key($post_status);
	$args->name = $post_status;

	// Set various defaults.
	if ( null === $args->public && null === $args->internal && null === $args->protected && null === $args->private )
		$args->internal = true;

	if ( null === $args->public  )
		$args->public = false;

	if ( null === $args->private  )
		$args->private = false;

	if ( null === $args->protected  )
		$args->protected = false;

	if ( null === $args->internal  )
		$args->internal = false;

	if ( null === $args->publicly_queryable )
		$args->publicly_queryable = $args->public;

	if ( null === $args->exclude_from_search )
		$args->exclude_from_search = $args->internal;

	if ( null === $args->show_in_admin_all_list )
		$args->show_in_admin_all_list = !$args->internal;

	if ( null === $args->show_in_admin_status_list )
		$args->show_in_admin_status_list = !$args->internal;

	if ( false === $args->label )
		$args->label = $post_status;

	if ( false === $args->label_count )
		$args->label_count = _n_noop( $args->label, $args->label );

	$wp_post_statuses[$post_status] = $args;

	return $args;
}

/**
 * Retrieve a post status object by name.
 *
 * @since 3.0.0
 *
 * @global array $wp_post_statuses List of post statuses.
 *
 * @see register_post_status()
 *
 * @param string $post_status The name of a registered post status.
 * @return object|null A post status object.
 */
function get_post_status_object( $post_status ) {
	global $wp_post_statuses;

	if ( empty($wp_post_statuses[$post_status]) )
		return null;

	return $wp_post_statuses[$post_status];
}

/**
 * Get a list of post statuses.
 *
 * @since 3.0.0
 *
 * @global array $wp_post_statuses List of post statuses.
 *
 * @see register_post_status()
 *
 * @param array|string $args     Optional. Array or string of post status arguments to compare against
 *                               properties of the global `$wp_post_statuses objects`. Default empty array.
 * @param string       $output   Optional. The type of output to return, either 'names' or 'objects'. Default 'names'.
 * @param string       $operator Optional. The logical operation to perform. 'or' means only one element
 *                               from the array needs to match; 'and' means all elements must match.
 *                               Default 'and'.
 * @return array A list of post status names or objects.
 */
function get_post_stati( $args = array(), $output = 'names', $operator = 'and' ) {
	global $wp_post_statuses;

	$field = ('names' == $output) ? 'name' : false;

	return wp_filter_object_list($wp_post_statuses, $args, $operator, $field);
}

/**
 * Whether the post type is hierarchical.
 *
 * A false return value might also mean that the post type does not exist.
 *
 * @since 3.0.0
 *
 * @see get_post_type_object()
 *
 * @param string $post_type Post type name
 * @return bool Whether post type is hierarchical.
 */
function is_post_type_hierarchical( $post_type ) {
	if ( ! post_type_exists( $post_type ) )
		return false;

	$post_type = get_post_type_object( $post_type );
	return $post_type->hierarchical;
}

/**
 * Determines whether a post type is registered.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 3.0.0
 *
 * @see get_post_type_object()
 *
 * @param string $post_type Post type name.
 * @return bool Whether post type is registered.
 */
function post_type_exists( $post_type ) {
	return (bool) get_post_type_object( $post_type );
}

/**
 * Retrieves the post type of the current post or of a given post.
 *
 * @since 2.1.0
 *
 * @param int|WP_Post|null $post Optional. Post ID or post object. Default is global $post.
 * @return string|false          Post type on success, false on failure.
 */
function get_post_type( $post = null ) {
	if ( $post = get_post( $post ) )
		return $post->post_type;

	return false;
}

/**
 * Retrieves a post type object by name.
 *
 * @since 3.0.0
 * @since 4.6.0 Object returned is now an instance of WP_Post_Type.
 *
 * @global array $wp_post_types List of post types.
 *
 * @see register_post_type()
 *
 * @param string $post_type The name of a registered post type.
 * @return WP_Post_Type|null WP_Post_Type object if it exists, null otherwise.
 */
function get_post_type_object( $post_type ) {
	global $wp_post_types;

	if ( ! is_scalar( $post_type ) || empty( $wp_post_types[ $post_type ] ) ) {
		return null;
	}

	return $wp_post_types[ $post_type ];
}

/**
 * Get a list of all registered post type objects.
 *
 * @since 2.9.0
 *
 * @global array $wp_post_types List of post types.
 *
 * @see register_post_type() for accepted arguments.
 *
 * @param array|string $args     Optional. An array of key => value arguments to match against
 *                               the post type objects. Default empty array.
 * @param string       $output   Optional. The type of output to return. Accepts post type 'names'
 *                               or 'objects'. Default 'names'.
 * @param string       $operator Optional. The logical operation to perform. 'or' means only one
 *                               element from the array needs to match; 'and' means all elements
 *                               must match; 'not' means no elements may match. Default 'and'.
 * @return array A list of post type names or objects.
 */
function get_post_types( $args = array(), $output = 'names', $operator = 'and' ) {
	global $wp_post_types;

	$field = ('names' == $output) ? 'name' : false;

	return wp_filter_object_list($wp_post_types, $args, $operator, $field);
}

/**
 * Registers a post type.
 *
 * Note: Post type registrations should not be hooked before the
 * {@see 'init'} action. Also, any taxonomy connections should be
 * registered via the `$taxonomies` argument to ensure consistency
 * when hooks such as {@see 'parse_query'} or {@see 'pre_get_posts'}
 * are used.
 *
 * Post types can support any number of built-in core features such
 * as meta boxes, custom fields, post thumbnails, post statuses,
 * comments, and more. See the `$supports` argument for a complete
 * list of supported features.
 *
 * @since 2.9.0
 * @since 3.0.0 The `show_ui` argument is now enforced on the new post screen.
 * @since 4.4.0 The `show_ui` argument is now enforced on the post type listing
 *              screen and post editing screen.
 * @since 4.6.0 Post type object returned is now an instance of WP_Post_Type.
 * @since 4.7.0 Introduced `show_in_rest`, 'rest_base' and 'rest_controller_class'
 *              arguments to register the post type in REST API.
 *
 * @global array $wp_post_types List of post types.
 *
 * @param string $post_type Post type key. Must not exceed 20 characters and may
 *                          only contain lowercase alphanumeric characters, dashes,
 *                          and underscores. See sanitize_key().
 * @param array|string $args {
 *     Array or string of arguments for registering a post type.
 *
 *     @type string      $label                 Name of the post type shown in the menu. Usually plural.
 *                                              Default is value of $labels['name'].
 *     @type array       $labels                An array of labels for this post type. If not set, post
 *                                              labels are inherited for non-hierarchical types and page
 *                                              labels for hierarchical ones. See get_post_type_labels() for a full
 *                                              list of supported labels.
 *     @type string      $description           A short descriptive summary of what the post type is.
 *                                              Default empty.
 *     @type bool        $public                Whether a post type is intended for use publicly either via
 *                                              the admin interface or by front-end users. While the default
 *                                              settings of $exclude_from_search, $publicly_queryable, $show_ui,
 *                                              and $show_in_nav_menus are inherited from public, each does not
 *                                              rely on this relationship and controls a very specific intention.
 *                                              Default false.
 *     @type bool        $hierarchical          Whether the post type is hierarchical (e.g. page). Default false.
 *     @type bool        $exclude_from_search   Whether to exclude posts with this post type from front end search
 *                                              results. Default is the opposite value of $public.
 *     @type bool        $publicly_queryable    Whether queries can be performed on the front end for the post type
 *                                              as part of parse_request(). Endpoints would include:
 *                                              * ?post_type={post_type_key}
 *                                              * ?{post_type_key}={single_post_slug}
 *                                              * ?{post_type_query_var}={single_post_slug}
 *                                              If not set, the default is inherited from $public.
 *     @type bool        $show_ui               Whether to generate and allow a UI for managing this post type in the
 *                                              admin. Default is value of $public.
 *     @type bool        $show_in_menu          Where to show the post type in the admin menu. To work, $show_ui
 *                                              must be true. If true, the post type is shown in its own top level
 *                                              menu. If false, no menu is shown. If a string of an existing top
 *                                              level menu (eg. 'tools.php' or 'edit.php?post_type=page'), the post
 *                                              type will be placed as a sub-menu of that.
 *                                              Default is value of $show_ui.
 *     @type bool        $show_in_nav_menus     Makes this post type available for selection in navigation menus.
 *                                              Default is value $public.
 *     @type bool        $show_in_admin_bar     Makes this post type available via the admin bar. Default is value
 *                                              of $show_in_menu.
 *     @type bool        $show_in_rest          Whether to add the post type route in the REST API 'wp/v2' namespace.
 *     @type string      $rest_base             To change the base url of REST API route. Default is $post_type.
 *     @type string      $rest_controller_class REST API Controller class name. Default is 'WP_REST_Posts_Controller'.
 *     @type int         $menu_position         The position in the menu order the post type should appear. To work,
 *                                              $show_in_menu must be true. Default null (at the bottom).
 *     @type string      $menu_icon             The url to the icon to be used for this menu. Pass a base64-encoded
 *                                              SVG using a data URI, which will be colored to match the color scheme
 *                                              -- this should begin with 'data:image/svg+xml;base64,'. Pass the name
 *                                              of a Dashicons helper class to use a font icon, e.g.
 *                                              'dashicons-chart-pie'. Pass 'none' to leave div.wp-menu-image empty
 *                                              so an icon can be added via CSS. Defaults to use the posts icon.
 *     @type string      $capability_type       The string to use to build the read, edit, and delete capabilities.
 *                                              May be passed as an array to allow for alternative plurals when using
 *                                              this argument as a base to construct the capabilities, e.g.
 *                                              array('story', 'stories'). Default 'post'.
 *     @type array       $capabilities          Array of capabilities for this post type. $capability_type is used
 *                                              as a base to construct capabilities by default.
 *                                              See get_post_type_capabilities().
 *     @type bool        $map_meta_cap          Whether to use the internal default meta capability handling.
 *                                              Default false.
 *     @type array       $supports              Core feature(s) the post type supports. Serves as an alias for calling
 *                                              add_post_type_support() directly. Core features include 'title',
 *                                              'editor', 'comments', 'revisions', 'trackbacks', 'author', 'excerpt',
 *                                              'page-attributes', 'thumbnail', 'custom-fields', and 'post-formats'.
 *                                              Additionally, the 'revisions' feature dictates whether the post type
 *                                              will store revisions, and the 'comments' feature dictates whether the
 *                                              comments count will show on the edit screen. Defaults is an array
 *                                              containing 'title' and 'editor'.
 *     @type callable    $register_meta_box_cb  Provide a callback function that sets up the meta boxes for the
 *                                              edit form. Do remove_meta_box() and add_meta_box() calls in the
 *                                              callback. Default null.
 *     @type array       $taxonomies            An array of taxonomy identifiers that will be registered for the
 *                                              post type. Taxonomies can be registered later with register_taxonomy()
 *                                              or register_taxonomy_for_object_type().
 *                                              Default empty array.
 *     @type bool|string $has_archive           Whether there should be post type archives, or if a string, the
 *                                              archive slug to use. Will generate the proper rewrite rules if
 *                                              $rewrite is enabled. Default false.
 *     @type bool|array  $rewrite              {
 *         Triggers the handling of rewrites for this post type. To prevent rewrite, set to false.
 *         Defaults to true, using $post_type as slug. To specify rewrite rules, an array can be
 *         passed with any of these keys:
 *
 *         @type string $slug       Customize the permastruct slug. Defaults to $post_type key.
 *         @type bool   $with_front Whether the permastruct should be prepended with WP_Rewrite::$front.
 *                                  Default true.
 *         @type bool   $feeds      Whether the feed permastruct should be built for this post type.
 *                                  Default is value of $has_archive.
 *         @type bool   $pages      Whether the permastruct should provide for pagination. Default true.
 *         @type const  $ep_mask    Endpoint mask to assign. If not specified and permalink_epmask is set,
 *                                  inherits from $permalink_epmask. If not specified and permalink_epmask
 *                                  is not set, defaults to EP_PERMALINK.
 *     }
 *     @type string|bool $query_var             Sets the query_var key for this post type. Defaults to $post_type
 *                                              key. If false, a post type cannot be loaded at
 *                                              ?{query_var}={post_slug}. If specified as a string, the query
 *                                              ?{query_var_string}={post_slug} will be valid.
 *     @type bool        $can_export            Whether to allow this post type to be exported. Default true.
 *     @type bool        $delete_with_user      Whether to delete posts of this type when deleting a user. If true,
 *                                              posts of this type belonging to the user will be moved to trash
 *                                              when then user is deleted. If false, posts of this type belonging
 *                                              to the user will *not* be trashed or deleted. If not set (the default),
 *                                              posts are trashed if post_type_supports('author'). Otherwise posts
 *                                              are not trashed or deleted. Default null.
 *     @type bool        $_builtin              FOR INTERNAL USE ONLY! True if this post type is a native or
 *                                              "built-in" post_type. Default false.
 *     @type string      $_edit_link            FOR INTERNAL USE ONLY! URL segment to use for edit link of
 *                                              this post type. Default 'post.php?post=%d'.
 * }
 * @return WP_Post_Type|WP_Error The registered post type object, or an error object.
 */
function register_post_type( $post_type, $args = array() ) {
	global $wp_post_types;

	if ( ! is_array( $wp_post_types ) ) {
		$wp_post_types = array();
	}

	// Sanitize post type name
	$post_type = sanitize_key( $post_type );

	if ( empty( $post_type ) || strlen( $post_type ) > 20 ) {
		_doing_it_wrong( __FUNCTION__, __( 'Post type names must be between 1 and 20 characters in length.' ), '4.2.0' );
		return new WP_Error( 'post_type_length_invalid', __( 'Post type names must be between 1 and 20 characters in length.' ) );
	}

	$post_type_object = new WP_Post_Type( $post_type, $args );
	$post_type_object->add_supports();
	$post_type_object->add_rewrite_rules();
	$post_type_object->register_meta_boxes();

	$wp_post_types[ $post_type ] = $post_type_object;

	$post_type_object->add_hooks();
	$post_type_object->register_taxonomies();

	/**
	 * Fires after a post type is registered.
	 *
	 * @since 3.3.0
	 * @since 4.6.0 Converted the `$post_type` parameter to accept a WP_Post_Type object.
	 *
	 * @param string       $post_type        Post type.
	 * @param WP_Post_Type $post_type_object Arguments used to register the post type.
	 */
	do_action( 'registered_post_type', $post_type, $post_type_object );

	return $post_type_object;
}

/**
 * Unregisters a post type.
 *
 * Can not be used to unregister built-in post types.
 *
 * @since 4.5.0
 *
 * @global array $wp_post_types List of post types.
 *
 * @param string $post_type Post type to unregister.
 * @return bool|WP_Error True on success, WP_Error on failure or if the post type doesn't exist.
 */
function unregister_post_type( $post_type ) {
	global $wp_post_types;

	if ( ! post_type_exists( $post_type ) ) {
		return new WP_Error( 'invalid_post_type', __( 'Invalid post type.' ) );
	}

	$post_type_object = get_post_type_object( $post_type );

	// Do not allow unregistering internal post types.
	if ( $post_type_object->_builtin ) {
		return new WP_Error( 'invalid_post_type', __( 'Unregistering a built-in post type is not allowed' ) );
	}

	$post_type_object->remove_supports();
	$post_type_object->remove_rewrite_rules();
	$post_type_object->unregister_meta_boxes();
	$post_type_object->remove_hooks();
	$post_type_object->unregister_taxonomies();

	unset( $wp_post_types[ $post_type ] );

	/**
	 * Fires after a post type was unregistered.
	 *
	 * @since 4.5.0
	 *
	 * @param string $post_type Post type key.
	 */
	do_action( 'unregistered_post_type', $post_type );

	return true;
}

/**
 * Build an object with all post type capabilities out of a post type object
 *
 * Post type capabilities use the 'capability_type' argument as a base, if the
 * capability is not set in the 'capabilities' argument array or if the
 * 'capabilities' argument is not supplied.
 *
 * The capability_type argument can optionally be registered as an array, with
 * the first value being singular and the second plural, e.g. array('story, 'stories')
 * Otherwise, an 's' will be added to the value for the plural form. After
 * registration, capability_type will always be a string of the singular value.
 *
 * By default, seven keys are accepted as part of the capabilities array:
 *
 * - edit_post, read_post, and delete_post are meta capabilities, which are then
 *   generally mapped to corresponding primitive capabilities depending on the
 *   context, which would be the post being edited/read/deleted and the user or
 *   role being checked. Thus these capabilities would generally not be granted
 *   directly to users or roles.
 *
 * - edit_posts - Controls whether objects of this post type can be edited.
 * - edit_others_posts - Controls whether objects of this type owned by other users
 *   can be edited. If the post type does not support an author, then this will
 *   behave like edit_posts.
 * - publish_posts - Controls publishing objects of this post type.
 * - read_private_posts - Controls whether private objects can be read.
 *
 * These four primitive capabilities are checked in core in various locations.
 * There are also seven other primitive capabilities which are not referenced
 * directly in core, except in map_meta_cap(), which takes the three aforementioned
 * meta capabilities and translates them into one or more primitive capabilities
 * that must then be checked against the user or role, depending on the context.
 *
 * - read - Controls whether objects of this post type can be read.
 * - delete_posts - Controls whether objects of this post type can be deleted.
 * - delete_private_posts - Controls whether private objects can be deleted.
 * - delete_published_posts - Controls whether published objects can be deleted.
 * - delete_others_posts - Controls whether objects owned by other users can be
 *   can be deleted. If the post type does not support an author, then this will
 *   behave like delete_posts.
 * - edit_private_posts - Controls whether private objects can be edited.
 * - edit_published_posts - Controls whether published objects can be edited.
 *
 * These additional capabilities are only used in map_meta_cap(). Thus, they are
 * only assigned by default if the post type is registered with the 'map_meta_cap'
 * argument set to true (default is false).
 *
 * @since 3.0.0
 *
 * @see register_post_type()
 * @see map_meta_cap()
 *
 * @param object $args Post type registration arguments.
 * @return object Object with all the capabilities as member variables.
 */
function get_post_type_capabilities( $args ) {
	if ( ! is_array( $args->capability_type ) )
		$args->capability_type = array( $args->capability_type, $args->capability_type . 's' );

	// Singular base for meta capabilities, plural base for primitive capabilities.
	list( $singular_base, $plural_base ) = $args->capability_type;

	$default_capabilities = array(
		// Meta capabilities
		'edit_post'          => 'edit_'         . $singular_base,
		'read_post'          => 'read_'         . $singular_base,
		'delete_post'        => 'delete_'       . $singular_base,
		// Primitive capabilities used outside of map_meta_cap():
		'edit_posts'         => 'edit_'         . $plural_base,
		'edit_others_posts'  => 'edit_others_'  . $plural_base,
		'publish_posts'      => 'publish_'      . $plural_base,
		'read_private_posts' => 'read_private_' . $plural_base,
	);

	// Primitive capabilities used within map_meta_cap():
	if ( $args->map_meta_cap ) {
		$default_capabilities_for_mapping = array(
			'read'                   => 'read',
			'delete_posts'           => 'delete_'           . $plural_base,
			'delete_private_posts'   => 'delete_private_'   . $plural_base,
			'delete_published_posts' => 'delete_published_' . $plural_base,
			'delete_others_posts'    => 'delete_others_'    . $plural_base,
			'edit_private_posts'     => 'edit_private_'     . $plural_base,
			'edit_published_posts'   => 'edit_published_'   . $plural_base,
		);
		$default_capabilities = array_merge( $default_capabilities, $default_capabilities_for_mapping );
	}

	$capabilities = array_merge( $default_capabilities, $args->capabilities );

	// Post creation capability simply maps to edit_posts by default:
	if ( ! isset( $capabilities['create_posts'] ) )
		$capabilities['create_posts'] = $capabilities['edit_posts'];

	// Remember meta capabilities for future reference.
	if ( $args->map_meta_cap )
		_post_type_meta_capabilities( $capabilities );

	return (object) $capabilities;
}

/**
 * Store or return a list of post type meta caps for map_meta_cap().
 *
 * @since 3.1.0
 * @access private
 *
 * @global array $post_type_meta_caps Used to store meta capabilities.
 *
 * @param array $capabilities Post type meta capabilities.
 */
function _post_type_meta_capabilities( $capabilities = null ) {
	global $post_type_meta_caps;

	foreach ( $capabilities as $core => $custom ) {
		if ( in_array( $core, array( 'read_post', 'delete_post', 'edit_post' ) ) ) {
			$post_type_meta_caps[ $custom ] = $core;
		}
	}
}

/**
 * Builds an object with all post type labels out of a post type object.
 *
 * Accepted keys of the label array in the post type object:
 *
 * - `name` - General name for the post type, usually plural. The same and overridden
 *          by `$post_type_object->label`. Default is 'Posts' / 'Pages'.
 * - `singular_name` - Name for one object of this post type. Default is 'Post' / 'Page'.
 * - `add_new` - Default is 'Add New' for both hierarchical and non-hierarchical types.
 *             When internationalizing this string, please use a {@link https://codex.wordpress.org/I18n_for_WordPress_Developers#Disambiguation_by_context gettext context}
 *             matching your post type. Example: `_x( 'Add New', 'product', 'textdomain' );`.
 * - `add_new_item` - Label for adding a new singular item. Default is 'Add New Post' / 'Add New Page'.
 * - `edit_item` - Label for editing a singular item. Default is 'Edit Post' / 'Edit Page'.
 * - `new_item` - Label for the new item page title. Default is 'New Post' / 'New Page'.
 * - `view_item` - Label for viewing a singular item. Default is 'View Post' / 'View Page'.
 * - `view_items` - Label for viewing post type archives. Default is 'View Posts' / 'View Pages'.
 * - `search_items` - Label for searching plural items. Default is 'Search Posts' / 'Search Pages'.
 * - `not_found` - Label used when no items are found. Default is 'No posts found' / 'No pages found'.
 * - `not_found_in_trash` - Label used when no items are in the trash. Default is 'No posts found in Trash' /
 *                        'No pages found in Trash'.
 * - `parent_item_colon` - Label used to prefix parents of hierarchical items. Not used on non-hierarchical
 *                       post types. Default is 'Parent Page:'.
 * - `all_items` - Label to signify all items in a submenu link. Default is 'All Posts' / 'All Pages'.
 * - `archives` - Label for archives in nav menus. Default is 'Post Archives' / 'Page Archives'.
 * - `attributes` - Label for the attributes meta box. Default is 'Post Attributes' / 'Page Attributes'.
 * - `insert_into_item` - Label for the media frame button. Default is 'Insert into post' / 'Insert into page'.
 * - `uploaded_to_this_item` - Label for the media frame filter. Default is 'Uploaded to this post' /
 *                           'Uploaded to this page'.
 * - `featured_image` - Label for the Featured Image meta box title. Default is 'Featured Image'.
 * - `set_featured_image` - Label for setting the featured image. Default is 'Set featured image'.
 * - `remove_featured_image` - Label for removing the featured image. Default is 'Remove featured image'.
 * - `use_featured_image` - Label in the media frame for using a featured image. Default is 'Use as featured image'.
 * - `menu_name` - Label for the menu name. Default is the same as `name`.
 * - `filter_items_list` - Label for the table views hidden heading. Default is 'Filter posts list' /
 *                       'Filter pages list'.
 * - `items_list_navigation` - Label for the table pagination hidden heading. Default is 'Posts list navigation' /
 *                           'Pages list navigation'.
 * - `items_list` - Label for the table hidden heading. Default is 'Posts list' / 'Pages list'.
 * - `item_published` - Label used when an item is published. Default is 'Post published.' / 'Page published.'
 * - `item_published_privately` - Label used when an item is published with private visibility.
 *                              Default is 'Post published privately.' / 'Page published privately.'
 * - `item_reverted_to_draft` - Label used when an item is switched to a draft.
 *                            Default is 'Post reverted to draft.' / 'Page reverted to draft.'
 * - `item_scheduled` - Label used when an item is scheduled for publishing. Default is 'Post scheduled.' /
 *                    'Page scheduled.'
 * - `item_updated` - Label used when an item is updated. Default is 'Post updated.' / 'Page updated.'
 *
 * Above, the first default value is for non-hierarchical post types (like posts)
 * and the second one is for hierarchical post types (like pages).
 *
 * Note: To set labels used in post type admin notices, see the {@see 'post_updated_messages'} filter.
 *
 * @since 3.0.0
 * @since 4.3.0 Added the `featured_image`, `set_featured_image`, `remove_featured_image`,
 *              and `use_featured_image` labels.
 * @since 4.4.0 Added the `archives`, `insert_into_item`, `uploaded_to_this_item`, `filter_items_list`,
 *              `items_list_navigation`, and `items_list` labels.
 * @since 4.6.0 Converted the `$post_type` parameter to accept a WP_Post_Type object.
 * @since 4.7.0 Added the `view_items` and `attributes` labels.
 * @since 5.0.0 Added the `item_published`, `item_published_privately`, `item_reverted_to_draft`,
 *              `item_scheduled`, and `item_updated` labels.
 *
 * @access private
 *
 * @param object|WP_Post_Type $post_type_object Post type object.
 * @return object Object with all the labels as member variables.
 */
function get_post_type_labels( $post_type_object ) {
	$nohier_vs_hier_defaults = array(
		'name' => array( _x('Posts', 'post type general name'), _x('Pages', 'post type general name') ),
		'singular_name' => array( _x('Post', 'post type singular name'), _x('Page', 'post type singular name') ),
		'add_new' => array( _x('Add New', 'post'), _x('Add New', 'page') ),
		'add_new_item' => array( __('Add New Post'), __('Add New Page') ),
		'edit_item' => array( __('Edit Post'), __('Edit Page') ),
		'new_item' => array( __('New Post'), __('New Page') ),
		'view_item' => array( __('View Post'), __('View Page') ),
		'view_items' => array( __('View Posts'), __('View Pages') ),
		'search_items' => array( __('Search Posts'), __('Search Pages') ),
		'not_found' => array( __('No posts found.'), __('No pages found.') ),
		'not_found_in_trash' => array( __('No posts found in Trash.'), __('No pages found in Trash.') ),
		'parent_item_colon' => array( null, __('Parent Page:') ),
		'all_items' => array( __( 'All Posts' ), __( 'All Pages' ) ),
		'archives' => array( __( 'Post Archives' ), __( 'Page Archives' ) ),
		'attributes' => array( __( 'Post Attributes' ), __( 'Page Attributes' ) ),
		'insert_into_item' => array( __( 'Insert into post' ), __( 'Insert into page' ) ),
		'uploaded_to_this_item' => array( __( 'Uploaded to this post' ), __( 'Uploaded to this page' ) ),
		'featured_image' => array( _x( 'Featured Image', 'post' ), _x( 'Featured Image', 'page' ) ),
		'set_featured_image' => array( _x( 'Set featured image', 'post' ), _x( 'Set featured image', 'page' ) ),
		'remove_featured_image' => array( _x( 'Remove featured image', 'post' ), _x( 'Remove featured image', 'page' ) ),
		'use_featured_image' => array( _x( 'Use as featured image', 'post' ), _x( 'Use as featured image', 'page' ) ),
		'filter_items_list' => array( __( 'Filter posts list' ), __( 'Filter pages list' ) ),
		'items_list_navigation' => array( __( 'Posts list navigation' ), __( 'Pages list navigation' ) ),
		'items_list' => array( __( 'Posts list' ), __( 'Pages list' ) ),
		'item_published' => array( __( 'Post published.' ), __( 'Page published.' ) ),
		'item_published_privately' => array( __( 'Post published privately.' ), __( 'Page published privately.' ) ),
		'item_reverted_to_draft' => array( __( 'Post reverted to draft.' ), __( 'Page reverted to draft.' ) ),
		'item_scheduled' => array( __( 'Post scheduled.' ), __( 'Page scheduled.' ) ),
		'item_updated' => array( __( 'Post updated.' ), __( 'Page updated.' ) ),
	);
	$nohier_vs_hier_defaults['menu_name'] = $nohier_vs_hier_defaults['name'];

	$labels = _get_custom_object_labels( $post_type_object, $nohier_vs_hier_defaults );

	$post_type = $post_type_object->name;

	$default_labels = clone $labels;

	/**
	 * Filters the labels of a specific post type.
	 *
	 * The dynamic portion of the hook name, `$post_type`, refers to
	 * the post type slug.
	 *
	 * @since 3.5.0
	 *
	 * @see get_post_type_labels() for the full list of labels.
	 *
	 * @param object $labels Object with labels for the post type as member variables.
	 */
	$labels = apply_filters( "post_type_labels_{$post_type}", $labels );

	// Ensure that the filtered labels contain all required default values.
	$labels = (object) array_merge( (array) $default_labels, (array) $labels );

	return $labels;
}

/**
 * Build an object with custom-something object (post type, taxonomy) labels
 * out of a custom-something object
 *
 * @since 3.0.0
 * @access private
 *
 * @param object $object                  A custom-something object.
 * @param array  $nohier_vs_hier_defaults Hierarchical vs non-hierarchical default labels.
 * @return object Object containing labels for the given custom-something object.
 */
function _get_custom_object_labels( $object, $nohier_vs_hier_defaults ) {
	$object->labels = (array) $object->labels;

	if ( isset( $object->label ) && empty( $object->labels['name'] ) )
		$object->labels['name'] = $object->label;

	if ( !isset( $object->labels['singular_name'] ) && isset( $object->labels['name'] ) )
		$object->labels['singular_name'] = $object->labels['name'];

	if ( ! isset( $object->labels['name_admin_bar'] ) )
		$object->labels['name_admin_bar'] = isset( $object->labels['singular_name'] ) ? $object->labels['singular_name'] : $object->name;

	if ( !isset( $object->labels['menu_name'] ) && isset( $object->labels['name'] ) )
		$object->labels['menu_name'] = $object->labels['name'];

	if ( !isset( $object->labels['all_items'] ) && isset( $object->labels['menu_name'] ) )
		$object->labels['all_items'] = $object->labels['menu_name'];

	if ( !isset( $object->labels['archives'] ) && isset( $object->labels['all_items'] ) ) {
		$object->labels['archives'] = $object->labels['all_items'];
	}

	$defaults = array();
	foreach ( $nohier_vs_hier_defaults as $key => $value ) {
		$defaults[$key] = $object->hierarchical ? $value[1] : $value[0];
	}
	$labels = array_merge( $defaults, $object->labels );
	$object->labels = (object) $object->labels;

	return (object) $labels;
}

/**
 * Add submenus for post types.
 *
 * @access private
 * @since 3.1.0
 */
function _add_post_type_submenus() {
	foreach ( get_post_types( array( 'show_ui' => true ) ) as $ptype ) {
		$ptype_obj = get_post_type_object( $ptype );
		// Sub-menus only.
		if ( ! $ptype_obj->show_in_menu || $ptype_obj->show_in_menu === true )
			continue;
		add_submenu_page( $ptype_obj->show_in_menu, $ptype_obj->labels->name, $ptype_obj->labels->all_items, $ptype_obj->cap->edit_posts, "edit.php?post_type=$ptype" );
	}
}

/**
 * Register support of certain features for a post type.
 *
 * All core features are directly associated with a functional area of the edit
 * screen, such as the editor or a meta box. Features include: 'title', 'editor',
 * 'comments', 'revisions', 'trackbacks', 'author', 'excerpt', 'page-attributes',
 * 'thumbnail', 'custom-fields', and 'post-formats'.
 *
 * Additionally, the 'revisions' feature dictates whether the post type will
 * store revisions, and the 'comments' feature dictates whether the comments
 * count will show on the edit screen.
 *
 * @since 3.0.0
 *
 * @global array $_wp_post_type_features
 *
 * @param string       $post_type The post type for which to add the feature.
 * @param string|array $feature   The feature being added, accepts an array of
 *                                feature strings or a single string.
 */
function add_post_type_support( $post_type, $feature ) {
	global $_wp_post_type_features;

	$features = (array) $feature;
	foreach ($features as $feature) {
		if ( func_num_args() == 2 )
			$_wp_post_type_features[$post_type][$feature] = true;
		else
			$_wp_post_type_features[$post_type][$feature] = array_slice( func_get_args(), 2 );
	}
}

/**
 * Remove support for a feature from a post type.
 *
 * @since 3.0.0
 *
 * @global array $_wp_post_type_features
 *
 * @param string $post_type The post type for which to remove the feature.
 * @param string $feature   The feature being removed.
 */
function remove_post_type_support( $post_type, $feature ) {
	global $_wp_post_type_features;

	unset( $_wp_post_type_features[ $post_type ][ $feature ] );
}

/**
 * Get all the post type features
 *
 * @since 3.4.0
 *
 * @global array $_wp_post_type_features
 *
 * @param string $post_type The post type.
 * @return array Post type supports list.
 */
function get_all_post_type_supports( $post_type ) {
	global $_wp_post_type_features;

	if ( isset( $_wp_post_type_features[$post_type] ) )
		return $_wp_post_type_features[$post_type];

	return array();
}

/**
 * Check a post type's support for a given feature.
 *
 * @since 3.0.0
 *
 * @global array $_wp_post_type_features
 *
 * @param string $post_type The post type being checked.
 * @param string $feature   The feature being checked.
 * @return bool Whether the post type supports the given feature.
 */
function post_type_supports( $post_type, $feature ) {
	global $_wp_post_type_features;

	return ( isset( $_wp_post_type_features[$post_type][$feature] ) );
}

/**
 * Retrieves a list of post type names that support a specific feature.
 *
 * @since 4.5.0
 *
 * @global array $_wp_post_type_features Post type features
 *
 * @param array|string $feature  Single feature or an array of features the post types should support.
 * @param string       $operator Optional. The logical operation to perform. 'or' means
 *                               only one element from the array needs to match; 'and'
 *                               means all elements must match; 'not' means no elements may
 *                               match. Default 'and'.
 * @return array A list of post type names.
 */
function get_post_types_by_support( $feature, $operator = 'and' ) {
	global $_wp_post_type_features;

	$features = array_fill_keys( (array) $feature, true );

	return array_keys( wp_filter_object_list( $_wp_post_type_features, $features, $operator ) );
}

/**
 * Update the post type for the post ID.
 *
 * The page or post cache will be cleaned for the post ID.
 *
 * @since 2.5.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int    $post_id   Optional. Post ID to change post type. Default 0.
 * @param string $post_type Optional. Post type. Accepts 'post' or 'page' to
 *                          name a few. Default 'post'.
 * @return int|false Amount of rows changed. Should be 1 for success and 0 for failure.
 */
function set_post_type( $post_id = 0, $post_type = 'post' ) {
	global $wpdb;

	$post_type = sanitize_post_field('post_type', $post_type, $post_id, 'db');
	$return = $wpdb->update( $wpdb->posts, array('post_type' => $post_type), array('ID' => $post_id) );

	clean_post_cache( $post_id );

	return $return;
}

/**
 * Determines whether a post type is considered "viewable".
 *
 * For built-in post types such as posts and pages, the 'public' value will be evaluated.
 * For all others, the 'publicly_queryable' value will be used.
 *
 * @since 4.4.0
 * @since 4.5.0 Added the ability to pass a post type name in addition to object.
 * @since 4.6.0 Converted the `$post_type` parameter to accept a WP_Post_Type object.
 *
 * @param string|WP_Post_Type $post_type Post type name or object.
 * @return bool Whether the post type should be considered viewable.
 */
function is_post_type_viewable( $post_type ) {
	if ( is_scalar( $post_type ) ) {
		$post_type = get_post_type_object( $post_type );
		if ( ! $post_type ) {
			return false;
		}
	}

	if ( ! is_object( $post_type ) ) {
		return false;
	}

	$is_viewable = $post_type->publicly_queryable || ( $post_type->_builtin && $post_type->public );

	/**
	 * Filters whether a post type is considered "viewable".
	 *
	 * The returned filtered value must be a boolean type to ensure
	 * `is_post_type_viewable()` only returns a boolean. This strictness
	 * is by design to maintain backwards-compatibility and guard against
	 * potential type errors in PHP 8.1+. Non-boolean values (even falsey
	 * and truthy values) will result in the function returning false.
	 *
	 * @since 5.9.0
	 *
	 * @param bool         $is_viewable Whether the post type is "viewable" (strict type).
	 * @param WP_Post_Type $post_type   Post type object.
	 */
	return true === apply_filters( 'is_post_type_viewable', $is_viewable, $post_type );
}

/**
 * Determines whether a post status is considered "viewable".
 *
 * For built-in post statuses such as publish and private, the 'public' value will be evaluated.
 * For all others, the 'publicly_queryable' value will be used.
 *
 * @since 5.7.0
 * @since 5.9.0 Added `is_post_status_viewable` hook to filter the result.
 *
 * @param string|stdClass $post_status Post status name or object.
 * @return bool Whether the post status should be considered viewable.
 */
function is_post_status_viewable( $post_status ) {
	if ( is_scalar( $post_status ) ) {
		$post_status = get_post_status_object( $post_status );

		if ( ! $post_status ) {
			return false;
		}
	}

	if (
		! is_object( $post_status ) ||
		$post_status->internal ||
		$post_status->protected
	) {
		return false;
	}

	$is_viewable = $post_status->publicly_queryable || ( $post_status->_builtin && $post_status->public );

	/**
	 * Filters whether a post status is considered "viewable".
	 *
	 * The returned filtered value must be a boolean type to ensure
	 * `is_post_status_viewable()` only returns a boolean. This strictness
	 * is by design to maintain backwards-compatibility and guard against
	 * potential type errors in PHP 8.1+. Non-boolean values (even falsey
	 * and truthy values) will result in the function returning false.
	 *
	 * @since 5.9.0
	 *
	 * @param bool     $is_viewable Whether the post status is "viewable" (strict type).
	 * @param stdClass $post_status Post status object.
	 */
	return true === apply_filters( 'is_post_status_viewable', $is_viewable, $post_status );
}

/**
 * Determines whether a post is publicly viewable.
 *
 * Posts are considered publicly viewable if both the post status and post type
 * are viewable.
 *
 * @since 5.7.0
 *
 * @param int|WP_Post|null $post Optional. Post ID or post object. Defaults to global $post.
 * @return bool Whether the post is publicly viewable.
 */
function is_post_publicly_viewable( $post = null ) {
	$post = get_post( $post );

	if ( ! $post ) {
		return false;
	}

	$post_type   = get_post_type( $post );
	$post_status = get_post_status( $post );

	return is_post_type_viewable( $post_type ) && is_post_status_viewable( $post_status );
}

/**
 * Retrieve list of latest posts or posts matching criteria.
 *
 * The defaults are as follows:
 *
 * @since 1.2.0
 *
 * @see WP_Query::parse_query()
 *
 * @param array $args {
 *     Optional. Arguments to retrieve posts. See WP_Query::parse_query() for all
 *     available arguments.
 *
 *     @type int        $numberposts      Total number of posts to retrieve. Is an alias of $posts_per_page
 *                                        in WP_Query. Accepts -1 for all. Default 5.
 *     @type int|string $category         Category ID or comma-separated list of IDs (this or any children).
 *                                        Is an alias of $cat in WP_Query. Default 0.
 *     @type array      $include          An array of post IDs to retrieve, sticky posts will be included.
 *                                        Is an alias of $post__in in WP_Query. Default empty array.
 *     @type array      $exclude          An array of post IDs not to retrieve. Default empty array.
 *     @type bool       $suppress_filters Whether to suppress filters. Default true.
 * }
 * @return array List of posts.
 */
function get_posts( $args = null ) {
	$defaults = array(
		'numberposts' => 5,
		'category' => 0, 'orderby' => 'date',
		'order' => 'DESC', 'include' => array(),
		'exclude' => array(), 'meta_key' => '',
		'meta_value' =>'', 'post_type' => 'post',
		'suppress_filters' => true
	);

	$r = wp_parse_args( $args, $defaults );
	if ( empty( $r['post_status'] ) )
		$r['post_status'] = ( 'attachment' == $r['post_type'] ) ? 'inherit' : 'publish';
	if ( ! empty($r['numberposts']) && empty($r['posts_per_page']) )
		$r['posts_per_page'] = $r['numberposts'];
	if ( ! empty($r['category']) )
		$r['cat'] = $r['category'];
	if ( ! empty($r['include']) ) {
		$incposts = wp_parse_id_list( $r['include'] );
		$r['posts_per_page'] = count($incposts);  // only the number of posts included
		$r['post__in'] = $incposts;
	} elseif ( ! empty($r['exclude']) )
		$r['post__not_in'] = wp_parse_id_list( $r['exclude'] );

	$r['ignore_sticky_posts'] = true;
	$r['no_found_rows'] = true;

	$get_posts = new WP_Query;
	return $get_posts->query($r);

}

//
// Post meta functions
//

/**
 * Add meta data field to a post.
 *
 * Post meta data is called "Custom Fields" on the Administration Screen.
 *
 * @since 1.5.0
 *
 * @param int    $post_id    Post ID.
 * @param string $meta_key   Metadata name.
 * @param mixed  $meta_value Metadata value. Must be serializable if non-scalar.
 * @param bool   $unique     Optional. Whether the same key should not be added.
 *                           Default false.
 * @return int|false Meta ID on success, false on failure.
 */
function add_post_meta( $post_id, $meta_key, $meta_value, $unique = false ) {
	// Make sure meta is added to the post, not a revision.
	$the_post = wp_is_post_revision( $post_id );
	if ( $the_post ) {
		$post_id = $the_post;
	}

	return add_metadata( 'post', $post_id, $meta_key, $meta_value, $unique );
}

/**
 * Remove metadata matching criteria from a post.
 *
 * You can match based on the key, or key and value. Removing based on key and
 * value, will keep from removing duplicate metadata with the same key. It also
 * allows removing all metadata matching key, if needed.
 *
 * @since 1.5.0
 *
 * @param int    $post_id    Post ID.
 * @param string $meta_key   Metadata name.
 * @param mixed  $meta_value Optional. Metadata value. Must be serializable if
 *                           non-scalar. Default empty.
 * @return bool True on success, false on failure.
 */
function delete_post_meta( $post_id, $meta_key, $meta_value = '' ) {
	// Make sure meta is added to the post, not a revision.
	$the_post = wp_is_post_revision( $post_id );
	if ( $the_post ) {
		$post_id = $the_post;
	}

	return delete_metadata( 'post', $post_id, $meta_key, $meta_value );
}

/**
 * Retrieve post meta field for a post.
 *
 * @since 1.5.0
 *
 * @param int    $post_id Post ID.
 * @param string $key     Optional. The meta key to retrieve. By default, returns
 *                        data for all keys. Default empty.
 * @param bool   $single  Optional. Whether to return a single value. Default false.
 * @return mixed Will be an array if $single is false. Will be value of meta data
 *               field if $single is true.
 */
function get_post_meta( $post_id, $key = '', $single = false ) {
	return get_metadata('post', $post_id, $key, $single);
}

/**
 * Update post meta field based on post ID.
 *
 * Use the $prev_value parameter to differentiate between meta fields with the
 * same key and post ID.
 *
 * If the meta field for the post does not exist, it will be added.
 *
 * @since 1.5.0
 *
 * @param int    $post_id    Post ID.
 * @param string $meta_key   Metadata key.
 * @param mixed  $meta_value Metadata value. Must be serializable if non-scalar.
 * @param mixed  $prev_value Optional. Previous value to check before removing.
 *                           Default empty.
 * @return int|bool Meta ID if the key didn't exist, true on successful update,
 *                  false on failure.
 */
function update_post_meta( $post_id, $meta_key, $meta_value, $prev_value = '' ) {
	// Make sure meta is added to the post, not a revision.
	$the_post = wp_is_post_revision( $post_id );
	if ( $the_post ) {
		$post_id = $the_post;
	}

	return update_metadata( 'post', $post_id, $meta_key, $meta_value, $prev_value );
}

/**
 * Delete everything from post meta matching meta key.
 *
 * @since 2.3.0
 *
 * @param string $post_meta_key Key to search for when deleting.
 * @return bool Whether the post meta key was deleted from the database.
 */
function delete_post_meta_by_key( $post_meta_key ) {
	return delete_metadata( 'post', null, $post_meta_key, '', true );
}

/**
 * Registers a meta key for posts.
 *
 * @since 4.9.8
 *
 * @param string $post_type Post type to register a meta key for. Pass an empty string
 *                          to register the meta key across all existing post types.
 * @param string $meta_key  The meta key to register.
 * @param array  $args      Data used to describe the meta key when registered. See
 *                          {@see register_meta()} for a list of supported arguments.
 * @return bool True if the meta key was successfully registered, false if not.
 */
function register_post_meta( $post_type, $meta_key, array $args ) {
	$args['object_subtype'] = $post_type;

	return register_meta( 'post', $meta_key, $args );
}

/**
 * Unregisters a meta key for posts.
 *
 * @since 4.9.8
 *
 * @param string $post_type Post type the meta key is currently registered for. Pass
 *                          an empty string if the meta key is registered across all
 *                          existing post types.
 * @param string $meta_key  The meta key to unregister.
 * @return bool True on success, false if the meta key was not previously registered.
 */
function unregister_post_meta( $post_type, $meta_key ) {
	return unregister_meta_key( 'post', $meta_key, $post_type );
}

/**
 * Retrieve post meta fields, based on post ID.
 *
 * The post meta fields are retrieved from the cache where possible,
 * so the function is optimized to be called more than once.
 *
 * @since 1.2.0
 *
 * @param int $post_id Optional. Post ID. Default is ID of the global $post.
 * @return array Post meta for the given post.
 */
function get_post_custom( $post_id = 0 ) {
	$post_id = absint( $post_id );
	if ( ! $post_id )
		$post_id = get_the_ID();

	return get_post_meta( $post_id );
}

/**
 * Retrieve meta field names for a post.
 *
 * If there are no meta fields, then nothing (null) will be returned.
 *
 * @since 1.2.0
 *
 * @param int $post_id Optional. Post ID. Default is ID of the global $post.
 * @return array|void Array of the keys, if retrieved.
 */
function get_post_custom_keys( $post_id = 0 ) {
	$custom = get_post_custom( $post_id );

	if ( !is_array($custom) )
		return;

	if ( $keys = array_keys($custom) )
		return $keys;
}

/**
 * Retrieve values for a custom post field.
 *
 * The parameters must not be considered optional. All of the post meta fields
 * will be retrieved and only the meta field key values returned.
 *
 * @since 1.2.0
 *
 * @param string $key     Optional. Meta field key. Default empty.
 * @param int    $post_id Optional. Post ID. Default is ID of the global $post.
 * @return array|null Meta field values.
 */
function get_post_custom_values( $key = '', $post_id = 0 ) {
	if ( !$key )
		return null;

	$custom = get_post_custom($post_id);

	return isset($custom[$key]) ? $custom[$key] : null;
}

/**
 * Determines whether a post is sticky.
 *
 * Sticky posts should remain at the top of The Loop. If the post ID is not
 * given, then The Loop ID for the current post will be used.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 2.7.0
 *
 * @param int $post_id Optional. Post ID. Default is ID of the global $post.
 * @return bool Whether post is sticky.
 */
function is_sticky( $post_id = 0 ) {
	$post_id = absint( $post_id );

	if ( ! $post_id )
		$post_id = get_the_ID();

	$stickies = get_option( 'sticky_posts' );

	if ( ! is_array( $stickies ) )
		return false;

	if ( in_array( $post_id, $stickies ) )
		return true;

	return false;
}

/**
 * Sanitize every post field.
 *
 * If the context is 'raw', then the post object or array will get minimal
 * sanitization of the integer fields.
 *
 * @since 2.3.0
 *
 * @see sanitize_post_field()
 *
 * @param object|WP_Post|array $post    The Post Object or Array
 * @param string               $context Optional. How to sanitize post fields.
 *                                      Accepts 'raw', 'edit', 'db', or 'display'.
 *                                      Default 'display'.
 * @return object|WP_Post|array The now sanitized Post Object or Array (will be the
 *                              same type as $post).
 */
function sanitize_post( $post, $context = 'display' ) {
	if ( is_object($post) ) {
		// Check if post already filtered for this context.
		if ( isset($post->filter) && $context == $post->filter )
			return $post;
		if ( !isset($post->ID) )
			$post->ID = 0;
		foreach ( array_keys(get_object_vars($post)) as $field )
			$post->$field = sanitize_post_field($field, $post->$field, $post->ID, $context);
		$post->filter = $context;
	} elseif ( is_array( $post ) ) {
		// Check if post already filtered for this context.
		if ( isset($post['filter']) && $context == $post['filter'] )
			return $post;
		if ( !isset($post['ID']) )
			$post['ID'] = 0;
		foreach ( array_keys($post) as $field )
			$post[$field] = sanitize_post_field($field, $post[$field], $post['ID'], $context);
		$post['filter'] = $context;
	}
	return $post;
}

/**
 * Sanitize post field based on context.
 *
 * Possible context values are:  'raw', 'edit', 'db', 'display', 'attribute' and
 * 'js'. The 'display' context is used by default. 'attribute' and 'js' contexts
 * are treated like 'display' when calling filters.
 *
 * @since 2.3.0
 * @since 4.4.0 Like `sanitize_post()`, `$context` defaults to 'display'.
 *
 * @param string $field   The Post Object field name.
 * @param mixed  $value   The Post Object value.
 * @param int    $post_id Post ID.
 * @param string $context Optional. How to sanitize post fields. Looks for 'raw', 'edit',
 *                        'db', 'display', 'attribute' and 'js'. Default 'display'.
 * @return mixed Sanitized value.
 */
function sanitize_post_field( $field, $value, $post_id, $context = 'display' ) {
	$int_fields = array('ID', 'post_parent', 'menu_order');
	if ( in_array($field, $int_fields) )
		$value = (int) $value;

	// Fields which contain arrays of integers.
	$array_int_fields = array( 'ancestors' );
	if ( in_array($field, $array_int_fields) ) {
		$value = array_map( 'absint', $value);
		return $value;
	}

	if ( 'raw' == $context )
		return $value;

	$prefixed = false;
	if ( false !== strpos($field, 'post_') ) {
		$prefixed = true;
		$field_no_prefix = str_replace('post_', '', $field);
	}

	if ( 'edit' == $context ) {
		$format_to_edit = array('post_content', 'post_excerpt', 'post_title', 'post_password');

		if ( $prefixed ) {

			/**
			 * Filters the value of a specific post field to edit.
			 *
			 * The dynamic portion of the hook name, `$field`, refers to the post
			 * field name.
			 *
			 * @since 2.3.0
			 *
			 * @param mixed $value   Value of the post field.
			 * @param int   $post_id Post ID.
			 */
			$value = apply_filters( "edit_{$field}", $value, $post_id );

			/**
			 * Filters the value of a specific post field to edit.
			 *
			 * The dynamic portion of the hook name, `$field_no_prefix`, refers to
			 * the post field name.
			 *
			 * @since 2.3.0
			 *
			 * @param mixed $value   Value of the post field.
			 * @param int   $post_id Post ID.
			 */
			$value = apply_filters( "{$field_no_prefix}_edit_pre", $value, $post_id );
		} else {
			$value = apply_filters( "edit_post_{$field}", $value, $post_id );
		}

		if ( in_array($field, $format_to_edit) ) {
			if ( 'post_content' == $field )
				$value = format_to_edit($value, user_can_richedit());
			else
				$value = format_to_edit($value);
		} else {
			$value = esc_attr($value);
		}
	} elseif ( 'db' == $context ) {
		if ( $prefixed ) {

			/**
			 * Filters the value of a specific post field before saving.
			 *
			 * The dynamic portion of the hook name, `$field`, refers to the post
			 * field name.
			 *
			 * @since 2.3.0
			 *
			 * @param mixed $value Value of the post field.
			 */
			$value = apply_filters( "pre_{$field}", $value );

			/**
			 * Filters the value of a specific field before saving.
			 *
			 * The dynamic portion of the hook name, `$field_no_prefix`, refers
			 * to the post field name.
			 *
			 * @since 2.3.0
			 *
			 * @param mixed $value Value of the post field.
			 */
			$value = apply_filters( "{$field_no_prefix}_save_pre", $value );
		} else {
			$value = apply_filters( "pre_post_{$field}", $value );

			/**
			 * Filters the value of a specific post field before saving.
			 *
			 * The dynamic portion of the hook name, `$field`, refers to the post
			 * field name.
			 *
			 * @since 2.3.0
			 *
			 * @param mixed $value Value of the post field.
			 */
			$value = apply_filters( "{$field}_pre", $value );
		}
	} else {

		// Use display filters by default.
		if ( $prefixed ) {

			/**
			 * Filters the value of a specific post field for display.
			 *
			 * The dynamic portion of the hook name, `$field`, refers to the post
			 * field name.
			 *
			 * @since 2.3.0
			 *
			 * @param mixed  $value   Value of the prefixed post field.
			 * @param int    $post_id Post ID.
			 * @param string $context Context for how to sanitize the field. Possible
			 *                        values include 'raw', 'edit', 'db', 'display',
			 *                        'attribute' and 'js'.
			 */
			$value = apply_filters( "{$field}", $value, $post_id, $context );
		} else {
			$value = apply_filters( "post_{$field}", $value, $post_id, $context );
		}

		if ( 'attribute' == $context ) {
			$value = esc_attr( $value );
		} elseif ( 'js' == $context ) {
			$value = esc_js( $value );
		}
	}

	return $value;
}

/**
 * Make a post sticky.
 *
 * Sticky posts should be displayed at the top of the front page.
 *
 * @since 2.7.0
 *
 * @param int $post_id Post ID.
 */
function stick_post( $post_id ) {
	$stickies = get_option('sticky_posts');

	if ( !is_array($stickies) )
		$stickies = array($post_id);

	if ( ! in_array($post_id, $stickies) )
		$stickies[] = $post_id;

	$updated = update_option( 'sticky_posts', $stickies );

	if ( $updated ) {
		/**
		 * Fires once a post has been added to the sticky list.
		 *
		 * @since 4.6.0
		 *
		 * @param int $post_id ID of the post that was stuck.
		 */
		do_action( 'post_stuck', $post_id );
	}
}

/**
 * Un-stick a post.
 *
 * Sticky posts should be displayed at the top of the front page.
 *
 * @since 2.7.0
 *
 * @param int $post_id Post ID.
 */
function unstick_post( $post_id ) {
	$stickies = get_option('sticky_posts');

	if ( !is_array($stickies) )
		return;

	if ( ! in_array($post_id, $stickies) )
		return;

	$offset = array_search($post_id, $stickies);
	if ( false === $offset )
		return;

	array_splice($stickies, $offset, 1);

	$updated = update_option( 'sticky_posts', $stickies );

	if ( $updated ) {
		/**
		 * Fires once a post has been removed from the sticky list.
		 *
		 * @since 4.6.0
		 *
		 * @param int $post_id ID of the post that was unstuck.
		 */
		do_action( 'post_unstuck', $post_id );
	}
}

/**
 * Return the cache key for wp_count_posts() based on the passed arguments.
 *
 * @since 3.9.0
 *
 * @param string $type Optional. Post type to retrieve count Default 'post'.
 * @param string $perm Optional. 'readable' or empty. Default empty.
 * @return string The cache key.
 */
function _count_posts_cache_key( $type = 'post', $perm = '' ) {
	$cache_key = 'posts-' . $type;
	if ( 'readable' == $perm && is_user_logged_in() ) {
		$post_type_object = get_post_type_object( $type );
		if ( $post_type_object && ! current_user_can( $post_type_object->cap->read_private_posts ) ) {
			$cache_key .= '_' . $perm . '_' . get_current_user_id();
		}
	}
	return $cache_key;
}

/**
 * Count number of posts of a post type and if user has permissions to view.
 *
 * This function provides an efficient method of finding the amount of post's
 * type a blog has. Another method is to count the amount of items in
 * get_posts(), but that method has a lot of overhead with doing so. Therefore,
 * when developing for 2.5+, use this function instead.
 *
 * The $perm parameter checks for 'readable' value and if the user can read
 * private posts, it will display that for the user that is signed in.
 *
 * @since 2.5.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $type Optional. Post type to retrieve count. Default 'post'.
 * @param string $perm Optional. 'readable' or empty. Default empty.
 * @return object Number of posts for each status.
 */
function wp_count_posts( $type = 'post', $perm = '' ) {
	global $wpdb;

	if ( ! post_type_exists( $type ) )
		return new stdClass;

	$cache_key = _count_posts_cache_key( $type, $perm );

	$counts = wp_cache_get( $cache_key, 'counts' );
	if ( false !== $counts ) {
		/** This filter is documented in wp-includes/post.php */
		return apply_filters( 'wp_count_posts', $counts, $type, $perm );
	}

	$query = "SELECT post_status, COUNT( * ) AS num_posts FROM {$wpdb->posts} WHERE post_type = %s";
	if ( 'readable' == $perm && is_user_logged_in() ) {
		$post_type_object = get_post_type_object($type);
		if ( ! current_user_can( $post_type_object->cap->read_private_posts ) ) {
			$query .= $wpdb->prepare( " AND (post_status != 'private' OR ( post_author = %d AND post_status = 'private' ))",
				get_current_user_id()
			);
		}
	}
	$query .= ' GROUP BY post_status';

	$results = (array) $wpdb->get_results( $wpdb->prepare( $query, $type ), ARRAY_A );
	$counts = array_fill_keys( get_post_stati(), 0 );

	foreach ( $results as $row ) {
		$counts[ $row['post_status'] ] = $row['num_posts'];
	}

	$counts = (object) $counts;
	wp_cache_set( $cache_key, $counts, 'counts' );

	/**
	 * Modify returned post counts by status for the current post type.
	 *
	 * @since 3.7.0
	 *
	 * @param object $counts An object containing the current post_type's post
	 *                       counts by status.
	 * @param string $type   Post type.
	 * @param string $perm   The permission to determine if the posts are 'readable'
	 *                       by the current user.
	 */
	return apply_filters( 'wp_count_posts', $counts, $type, $perm );
}

/**
 * Count number of attachments for the mime type(s).
 *
 * If you set the optional mime_type parameter, then an array will still be
 * returned, but will only have the item you are looking for. It does not give
 * you the number of attachments that are children of a post. You can get that
 * by counting the number of children that post has.
 *
 * @since 2.5.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string|array $mime_type Optional. Array or comma-separated list of
 *                                MIME patterns. Default empty.
 * @return object An object containing the attachment counts by mime type.
 */
function wp_count_attachments( $mime_type = '' ) {
	global $wpdb;

	$and = wp_post_mime_type_where( $mime_type );
	$count = $wpdb->get_results( "SELECT post_mime_type, COUNT( * ) AS num_posts FROM $wpdb->posts WHERE post_type = 'attachment' AND post_status != 'trash' $and GROUP BY post_mime_type", ARRAY_A );

	$counts = array();
	foreach ( (array) $count as $row ) {
		$counts[ $row['post_mime_type'] ] = $row['num_posts'];
	}
	$counts['trash'] = $wpdb->get_var( "SELECT COUNT( * ) FROM $wpdb->posts WHERE post_type = 'attachment' AND post_status = 'trash' $and");

	/**
	 * Modify returned attachment counts by mime type.
	 *
	 * @since 3.7.0
	 *
	 * @param object $counts    An object containing the attachment counts by
	 *                          mime type.
	 * @param string $mime_type The mime type pattern used to filter the attachments
	 *                          counted.
	 */
	return apply_filters( 'wp_count_attachments', (object) $counts, $mime_type );
}

/**
 * Get default post mime types.
 *
 * @since 2.9.0
 *
 * @return array List of post mime types.
 */
function get_post_mime_types() {
	$post_mime_types = array(	//	array( adj, noun )
		'image' => array(__('Images'), __('Manage Images'), _n_noop('Image <span class="count">(%s)</span>', 'Images <span class="count">(%s)</span>')),
		'audio' => array(__('Audio'), __('Manage Audio'), _n_noop('Audio <span class="count">(%s)</span>', 'Audio <span class="count">(%s)</span>')),
		'video' => array(__('Video'), __('Manage Video'), _n_noop('Video <span class="count">(%s)</span>', 'Video <span class="count">(%s)</span>')),
	);

	/**
	 * Filters the default list of post mime types.
	 *
	 * @since 2.5.0
	 *
	 * @param array $post_mime_types Default list of post mime types.
	 */
	return apply_filters( 'post_mime_types', $post_mime_types );
}

/**
 * Check a MIME-Type against a list.
 *
 * If the wildcard_mime_types parameter is a string, it must be comma separated
 * list. If the real_mime_types is a string, it is also comma separated to
 * create the list.
 *
 * @since 2.5.0
 *
 * @param string|array $wildcard_mime_types Mime types, e.g. audio/mpeg or image (same as image/*)
 *                                          or flash (same as *flash*).
 * @param string|array $real_mime_types     Real post mime type values.
 * @return array array(wildcard=>array(real types)).
 */
function wp_match_mime_types( $wildcard_mime_types, $real_mime_types ) {
	$matches = array();
	if ( is_string( $wildcard_mime_types ) ) {
		$wildcard_mime_types = array_map( 'trim', explode( ',', $wildcard_mime_types ) );
	}
	if ( is_string( $real_mime_types ) ) {
		$real_mime_types = array_map( 'trim', explode( ',', $real_mime_types ) );
	}

	$patternses = array();
	$wild = '[-._a-z0-9]*';

	foreach ( (array) $wildcard_mime_types as $type ) {
		$mimes = array_map( 'trim', explode( ',', $type ) );
		foreach ( $mimes as $mime ) {
			$regex = str_replace( '__wildcard__', $wild, preg_quote( str_replace( '*', '__wildcard__', $mime ) ) );
			$patternses[][$type] = "^$regex$";
			if ( false === strpos( $mime, '/' ) ) {
				$patternses[][$type] = "^$regex/";
				$patternses[][$type] = $regex;
			}
		}
	}
	asort( $patternses );

	foreach ( $patternses as $patterns ) {
		foreach ( $patterns as $type => $pattern ) {
			foreach ( (array) $real_mime_types as $real ) {
				if ( preg_match( "#$pattern#", $real ) && ( empty( $matches[$type] ) || false === array_search( $real, $matches[$type] ) ) ) {
					$matches[$type][] = $real;
				}
			}
		}
	}
	return $matches;
}

/**
 * Convert MIME types into SQL.
 *
 * @since 2.5.0
 *
 * @param string|array $post_mime_types List of mime types or comma separated string
 *                                      of mime types.
 * @param string       $table_alias     Optional. Specify a table alias, if needed.
 *                                      Default empty.
 * @return string The SQL AND clause for mime searching.
 */
function wp_post_mime_type_where( $post_mime_types, $table_alias = '' ) {
	$where = '';
	$wildcards = array('', '%', '%/%');
	if ( is_string($post_mime_types) )
		$post_mime_types = array_map('trim', explode(',', $post_mime_types));

	$wheres = array();

	foreach ( (array) $post_mime_types as $mime_type ) {
		$mime_type = preg_replace('/\s/', '', $mime_type);
		$slashpos = strpos($mime_type, '/');
		if ( false !== $slashpos ) {
			$mime_group = preg_replace('/[^-*.a-zA-Z0-9]/', '', substr($mime_type, 0, $slashpos));
			$mime_subgroup = preg_replace('/[^-*.+a-zA-Z0-9]/', '', substr($mime_type, $slashpos + 1));
			if ( empty($mime_subgroup) )
				$mime_subgroup = '*';
			else
				$mime_subgroup = str_replace('/', '', $mime_subgroup);
			$mime_pattern = "$mime_group/$mime_subgroup";
		} else {
			$mime_pattern = preg_replace('/[^-*.a-zA-Z0-9]/', '', $mime_type);
			if ( false === strpos($mime_pattern, '*') )
				$mime_pattern .= '/*';
		}

		$mime_pattern = preg_replace('/\*+/', '%', $mime_pattern);

		if ( in_array( $mime_type, $wildcards ) )
			return '';

		if ( false !== strpos($mime_pattern, '%') )
			$wheres[] = empty($table_alias) ? "post_mime_type LIKE '$mime_pattern'" : "$table_alias.post_mime_type LIKE '$mime_pattern'";
		else
			$wheres[] = empty($table_alias) ? "post_mime_type = '$mime_pattern'" : "$table_alias.post_mime_type = '$mime_pattern'";
	}
	if ( !empty($wheres) )
		$where = ' AND (' . join(' OR ', $wheres) . ') ';
	return $where;
}

/**
 * Trash or delete a post or page.
 *
 * When the post and page is permanently deleted, everything that is tied to
 * it is deleted also. This includes comments, post meta fields, and terms
 * associated with the post.
 *
 * The post or page is moved to trash instead of permanently deleted unless
 * trash is disabled, item is already in the trash, or $force_delete is true.
 *
 * @since 1.0.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 * @see wp_delete_attachment()
 * @see wp_trash_post()
 *
 * @param int  $postid       Optional. Post ID. Default 0.
 * @param bool $force_delete Optional. Whether to bypass trash and force deletion.
 *                           Default false.
 * @return WP_Post|false|null Post data on success, false or null on failure.
 */
function wp_delete_post( $postid = 0, $force_delete = false ) {
	global $wpdb;

	$post = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->posts WHERE ID = %d", $postid ) );

	if ( ! $post ) {
		return $post;
	}

	$post = get_post( $post );

	if ( ! $force_delete && ( 'post' === $post->post_type || 'page' === $post->post_type ) && 'trash' !== get_post_status( $postid ) && EMPTY_TRASH_DAYS ) {
		return wp_trash_post( $postid );
	}

	if ( 'attachment' === $post->post_type ) {
		return wp_delete_attachment( $postid, $force_delete );
	}

	/**
	 * Filters whether a post deletion should take place.
	 *
	 * @since 4.4.0
	 *
	 * @param bool    $delete       Whether to go forward with deletion.
	 * @param WP_Post $post         Post object.
	 * @param bool    $force_delete Whether to bypass the trash.
	 */
	$check = apply_filters( 'pre_delete_post', null, $post, $force_delete );
	if ( null !== $check ) {
		return $check;
	}

	/**
	 * Fires before a post is deleted, at the start of wp_delete_post().
	 *
	 * @since 3.2.0
	 *
	 * @see wp_delete_post()
	 *
	 * @param int $postid Post ID.
	 */
	do_action( 'before_delete_post', $postid );

	delete_post_meta($postid,'_wp_trash_meta_status');
	delete_post_meta($postid,'_wp_trash_meta_time');

	wp_delete_object_term_relationships($postid, get_object_taxonomies($post->post_type));

	$parent_data = array( 'post_parent' => $post->post_parent );
	$parent_where = array( 'post_parent' => $postid );

	if ( is_post_type_hierarchical( $post->post_type ) ) {
		// Point children of this page to its parent, also clean the cache of affected children.
		$children_query = $wpdb->prepare( "SELECT * FROM $wpdb->posts WHERE post_parent = %d AND post_type = %s", $postid, $post->post_type );
		$children = $wpdb->get_results( $children_query );
		if ( $children ) {
			$wpdb->update( $wpdb->posts, $parent_data, $parent_where + array( 'post_type' => $post->post_type ) );
		}
	}

	// Do raw query. wp_get_post_revisions() is filtered.
	$revision_ids = $wpdb->get_col( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE post_parent = %d AND post_type = 'revision'", $postid ) );
	// Use wp_delete_post (via wp_delete_post_revision) again. Ensures any meta/misplaced data gets cleaned up.
	foreach ( $revision_ids as $revision_id )
		wp_delete_post_revision( $revision_id );

	// Point all attachments to this post up one level.
	$wpdb->update( $wpdb->posts, $parent_data, $parent_where + array( 'post_type' => 'attachment' ) );

	wp_defer_comment_counting( true );

	$comment_ids = $wpdb->get_col( $wpdb->prepare( "SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = %d", $postid ));
	foreach ( $comment_ids as $comment_id ) {
		wp_delete_comment( $comment_id, true );
	}

	wp_defer_comment_counting( false );

	$post_meta_ids = $wpdb->get_col( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE post_id = %d ", $postid ));
	foreach ( $post_meta_ids as $mid )
		delete_metadata_by_mid( 'post', $mid );

	/**
	 * Fires immediately before a post is deleted from the database.
	 *
	 * @since 1.2.0
	 *
	 * @param int $postid Post ID.
	 */
	do_action( 'delete_post', $postid );
	$result = $wpdb->delete( $wpdb->posts, array( 'ID' => $postid ) );
	if ( ! $result ) {
		return false;
	}

	/**
	 * Fires immediately after a post is deleted from the database.
	 *
	 * @since 2.2.0
	 *
	 * @param int $postid Post ID.
	 */
	do_action( 'deleted_post', $postid );

	clean_post_cache( $post );

	if ( is_post_type_hierarchical( $post->post_type ) && $children ) {
		foreach ( $children as $child )
			clean_post_cache( $child );
	}

	wp_clear_scheduled_hook('publish_future_post', array( $postid ) );

	/**
	 * Fires after a post is deleted, at the conclusion of wp_delete_post().
	 *
	 * @since 3.2.0
	 *
	 * @see wp_delete_post()
	 *
	 * @param int $postid Post ID.
	 */
	do_action( 'after_delete_post', $postid );

	return $post;
}

/**
 * Reset the page_on_front, show_on_front, and page_for_post settings when
 * a linked page is deleted or trashed.
 *
 * Also ensures the post is no longer sticky.
 *
 * @since 3.7.0
 * @access private
 *
 * @param int $post_id Post ID.
 */
function _reset_front_page_settings_for_post( $post_id ) {
	$post = get_post( $post_id );
	if ( 'page' == $post->post_type ) {
	 	/*
	 	 * If the page is defined in option page_on_front or post_for_posts,
	 	 * adjust the corresponding options.
	 	 */
		if ( get_option( 'page_on_front' ) == $post->ID ) {
			update_option( 'show_on_front', 'posts' );
			update_option( 'page_on_front', 0 );
		}
		if ( get_option( 'page_for_posts' ) == $post->ID ) {
			delete_option( 'page_for_posts', 0 );
		}
	}
	unstick_post( $post->ID );
}

/**
 * Move a post or page to the Trash
 *
 * If trash is disabled, the post or page is permanently deleted.
 *
 * @since 2.9.0
 *
 * @see wp_delete_post()
 *
 * @param int $post_id Optional. Post ID. Default is ID of the global $post
 *                     if EMPTY_TRASH_DAYS equals true.
 * @return WP_Post|false|null Post data on success, false or null on failure.
 */
function wp_trash_post( $post_id = 0 ) {
	if ( ! EMPTY_TRASH_DAYS ) {
		return wp_delete_post( $post_id, true );
	}

	$post = get_post( $post_id );

	if ( ! $post ) {
		return $post;
	}

	if ( 'trash' === $post->post_status ) {
		return false;
	}

	/**
	 * Filters whether a post trashing should take place.
	 *
	 * @since 4.9.0
	 *
	 * @param bool    $trash Whether to go forward with trashing.
	 * @param WP_Post $post  Post object.
	 */
	$check = apply_filters( 'pre_trash_post', null, $post );
	if ( null !== $check ) {
		return $check;
	}

	/**
	 * Fires before a post is sent to the trash.
	 *
	 * @since 3.3.0
	 *
	 * @param int $post_id Post ID.
	 */
	do_action( 'wp_trash_post', $post_id );

	add_post_meta( $post_id, '_wp_trash_meta_status', $post->post_status );
	add_post_meta( $post_id, '_wp_trash_meta_time', time() );

	wp_update_post( array( 'ID' => $post_id, 'post_status' => 'trash' ) );

	wp_trash_post_comments( $post_id );

	/**
	 * Fires after a post is sent to the trash.
	 *
	 * @since 2.9.0
	 *
	 * @param int $post_id Post ID.
	 */
	do_action( 'trashed_post', $post_id );

	return $post;
}

/**
 * Restore a post or page from the Trash.
 *
 * @since 2.9.0
 *
 * @param int $post_id Optional. Post ID. Default is ID of the global $post.
 * @return WP_Post|false|null Post data on success, false or null on failure.
 */
function wp_untrash_post( $post_id = 0 ) {
	$post = get_post( $post_id );

	if ( ! $post ) {
		return $post;
	}

	if ( 'trash' !== $post->post_status ) {
		return false;
	}

	/**
	 * Filters whether a post untrashing should take place.
	 *
	 * @since 4.9.0
	 *
	 * @param bool    $untrash Whether to go forward with untrashing.
	 * @param WP_Post $post    Post object.
	 */
	$check = apply_filters( 'pre_untrash_post', null, $post );
	if ( null !== $check ) {
		return $check;
	}

	/**
	 * Fires before a post is restored from the trash.
	 *
	 * @since 2.9.0
	 *
	 * @param int $post_id Post ID.
	 */
	do_action( 'untrash_post', $post_id );

	$post_status = get_post_meta( $post_id, '_wp_trash_meta_status', true );

	delete_post_meta( $post_id, '_wp_trash_meta_status' );
	delete_post_meta( $post_id, '_wp_trash_meta_time' );

	wp_update_post( array( 'ID' => $post_id, 'post_status' => $post_status ) );

	wp_untrash_post_comments( $post_id );

	/**
	 * Fires after a post is restored from the trash.
	 *
	 * @since 2.9.0
	 *
	 * @param int $post_id Post ID.
	 */
	do_action( 'untrashed_post', $post_id );

	return $post;
}

/**
 * Moves comments for a post to the trash.
 *
 * @since 2.9.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int|WP_Post|null $post Optional. Post ID or post object. Defaults to global $post.
 * @return mixed|void False on failure.
 */
function wp_trash_post_comments( $post = null ) {
	global $wpdb;

	$post = get_post($post);
	if ( empty($post) )
		return;

	$post_id = $post->ID;

	/**
	 * Fires before comments are sent to the trash.
	 *
	 * @since 2.9.0
	 *
	 * @param int $post_id Post ID.
	 */
	do_action( 'trash_post_comments', $post_id );

	$comments = $wpdb->get_results( $wpdb->prepare("SELECT comment_ID, comment_approved FROM $wpdb->comments WHERE comment_post_ID = %d", $post_id) );
	if ( empty($comments) )
		return;

	// Cache current status for each comment.
	$statuses = array();
	foreach ( $comments as $comment )
		$statuses[$comment->comment_ID] = $comment->comment_approved;
	add_post_meta($post_id, '_wp_trash_meta_comments_status', $statuses);

	// Set status for all comments to post-trashed.
	$result = $wpdb->update($wpdb->comments, array('comment_approved' => 'post-trashed'), array('comment_post_ID' => $post_id));

	clean_comment_cache( array_keys($statuses) );

	/**
	 * Fires after comments are sent to the trash.
	 *
	 * @since 2.9.0
	 *
	 * @param int   $post_id  Post ID.
	 * @param array $statuses Array of comment statuses.
	 */
	do_action( 'trashed_post_comments', $post_id, $statuses );

	return $result;
}

/**
 * Restore comments for a post from the trash.
 *
 * @since 2.9.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int|WP_Post|null $post Optional. Post ID or post object. Defaults to global $post.
 * @return true|void
 */
function wp_untrash_post_comments( $post = null ) {
	global $wpdb;

	$post = get_post($post);
	if ( empty($post) )
		return;

	$post_id = $post->ID;

	$statuses = get_post_meta($post_id, '_wp_trash_meta_comments_status', true);

	if ( empty($statuses) )
		return true;

	/**
	 * Fires before comments are restored for a post from the trash.
	 *
	 * @since 2.9.0
	 *
	 * @param int $post_id Post ID.
	 */
	do_action( 'untrash_post_comments', $post_id );

	// Restore each comment to its original status.
	$group_by_status = array();
	foreach ( $statuses as $comment_id => $comment_status )
		$group_by_status[$comment_status][] = $comment_id;

	foreach ( $group_by_status as $status => $comments ) {
		// Sanity check. This shouldn't happen.
		if ( 'post-trashed' == $status ) {
			$status = '0';
		}
		$comments_in = implode( ', ', array_map( 'intval', $comments ) );
		$wpdb->query( $wpdb->prepare( "UPDATE $wpdb->comments SET comment_approved = %s WHERE comment_ID IN ($comments_in)", $status ) );
	}

	clean_comment_cache( array_keys($statuses) );

	delete_post_meta($post_id, '_wp_trash_meta_comments_status');

	/**
	 * Fires after comments are restored for a post from the trash.
	 *
	 * @since 2.9.0
	 *
	 * @param int $post_id Post ID.
	 */
	do_action( 'untrashed_post_comments', $post_id );
}

/**
 * Retrieve the list of categories for a post.
 *
 * Compatibility layer for themes and plugins. Also an easy layer of abstraction
 * away from the complexity of the taxonomy layer.
 *
 * @since 2.1.0
 *
 * @see wp_get_object_terms()
 *
 * @param int   $post_id Optional. The Post ID. Does not default to the ID of the
 *                       global $post. Default 0.
 * @param array $args    Optional. Category query parameters. Default empty array.
 *                       See WP_Term_Query::__construct() for supported arguments.
 * @return array|WP_Error List of categories. If the `$fields` argument passed via `$args` is 'all' or
 *                        'all_with_object_id', an array of WP_Term objects will be returned. If `$fields`
 *                        is 'ids', an array of category ids. If `$fields` is 'names', an array of category names.
 *                        WP_Error object if 'category' taxonomy doesn't exist.
 */
function wp_get_post_categories( $post_id = 0, $args = array() ) {
	$post_id = (int) $post_id;

	$defaults = array('fields' => 'ids');
	$args = wp_parse_args( $args, $defaults );

	$cats = wp_get_object_terms($post_id, 'category', $args);
	return $cats;
}

/**
 * Retrieve the tags for a post.
 *
 * There is only one default for this function, called 'fields' and by default
 * is set to 'all'. There are other defaults that can be overridden in
 * wp_get_object_terms().
 *
 * @since 2.3.0
 *
 * @param int   $post_id Optional. The Post ID. Does not default to the ID of the
 *                       global $post. Default 0.
 * @param array $args    Optional. Tag query parameters. Default empty array.
 *                       See WP_Term_Query::__construct() for supported arguments.
 * @return array|WP_Error Array of WP_Term objects on success or empty array if no tags were found.
 *                        WP_Error object if 'post_tag' taxonomy doesn't exist.
 */
function wp_get_post_tags( $post_id = 0, $args = array() ) {
	return wp_get_post_terms( $post_id, 'post_tag', $args);
}

/**
 * Retrieves the terms for a post.
 *
 * @since 2.8.0
 *
 * @param int          $post_id  Optional. The Post ID. Does not default to the ID of the
 *                               global $post. Default 0.
 * @param string|array $taxonomy Optional. The taxonomy slug or array of slugs for which
 *                               to retrieve terms. Default 'post_tag'.
 * @param array        $args     {
 *     Optional. Term query parameters. See WP_Term_Query::__construct() for supported arguments.
 *
 *     @type string $fields Term fields to retrieve. Default 'all'.
 * }
 * @return array|WP_Error Array of WP_Term objects on success or empty array if no terms were found.
 *                        WP_Error object if `$taxonomy` doesn't exist.
 */
function wp_get_post_terms( $post_id = 0, $taxonomy = 'post_tag', $args = array() ) {
	$post_id = (int) $post_id;

	$defaults = array('fields' => 'all');
	$args = wp_parse_args( $args, $defaults );

	$tags = wp_get_object_terms($post_id, $taxonomy, $args);

	return $tags;
}

/**
 * Retrieve a number of recent posts.
 *
 * @since 1.0.0
 *
 * @see get_posts()
 *
 * @param array  $args   Optional. Arguments to retrieve posts. Default empty array.
 * @param string $output Optional. The required return type. One of OBJECT or ARRAY_A, which correspond to
 *                       a WP_Post object or an associative array, respectively. Default ARRAY_A.
 * @return array|false Array of recent posts, where the type of each element is determined by $output parameter.
 *                     Empty array on failure.
 */
function wp_get_recent_posts( $args = array(), $output = ARRAY_A ) {

	if ( is_numeric( $args ) ) {
		_deprecated_argument( __FUNCTION__, '3.1.0', __( 'Passing an integer number of posts is deprecated. Pass an array of arguments instead.' ) );
		$args = array( 'numberposts' => absint( $args ) );
	}

	// Set default arguments.
	$defaults = array(
		'numberposts' => 10, 'offset' => 0,
		'category' => 0, 'orderby' => 'post_date',
		'order' => 'DESC', 'include' => '',
		'exclude' => '', 'meta_key' => '',
		'meta_value' =>'', 'post_type' => 'post', 'post_status' => 'draft, publish, future, pending, private',
		'suppress_filters' => true
	);

	$r = wp_parse_args( $args, $defaults );

	$results = get_posts( $r );

	// Backward compatibility. Prior to 3.1 expected posts to be returned in array.
	if ( ARRAY_A == $output ){
		foreach ( $results as $key => $result ) {
			$results[$key] = get_object_vars( $result );
		}
		return $results ? $results : array();
	}

	return $results ? $results : false;

}

/**
 * Insert or update a post.
 *
 * If the $postarr parameter has 'ID' set to a value, then post will be updated.
 *
 * You can set the post date manually, by setting the values for 'post_date'
 * and 'post_date_gmt' keys. You can close the comments or open the comments by
 * setting the value for 'comment_status' key.
 *
 * @since 1.0.0
 * @since 4.2.0 Support was added for encoding emoji in the post title, content, and excerpt.
 * @since 4.4.0 A 'meta_input' array can now be passed to `$postarr` to add post meta data.
 *
 * @see sanitize_post()
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param array $postarr {
 *     An array of elements that make up a post to update or insert.
 *
 *     @type int    $ID                    The post ID. If equal to something other than 0,
 *                                         the post with that ID will be updated. Default 0.
 *     @type int    $post_author           The ID of the user who added the post. Default is
 *                                         the current user ID.
 *     @type string $post_date             The date of the post. Default is the current time.
 *     @type string $post_date_gmt         The date of the post in the GMT timezone. Default is
 *                                         the value of `$post_date`.
 *     @type mixed  $post_content          The post content. Default empty.
 *     @type string $post_content_filtered The filtered post content. Default empty.
 *     @type string $post_title            The post title. Default empty.
 *     @type string $post_excerpt          The post excerpt. Default empty.
 *     @type string $post_status           The post status. Default 'draft'.
 *     @type string $post_type             The post type. Default 'post'.
 *     @type string $comment_status        Whether the post can accept comments. Accepts 'open' or 'closed'.
 *                                         Default is the value of 'default_comment_status' option.
 *     @type string $ping_status           Whether the post can accept pings. Accepts 'open' or 'closed'.
 *                                         Default is the value of 'default_ping_status' option.
 *     @type string $post_password         The password to access the post. Default empty.
 *     @type string $post_name             The post name. Default is the sanitized post title
 *                                         when creating a new post.
 *     @type string $to_ping               Space or carriage return-separated list of URLs to ping.
 *                                         Default empty.
 *     @type string $pinged                Space or carriage return-separated list of URLs that have
 *                                         been pinged. Default empty.
 *     @type string $post_modified         The date when the post was last modified. Default is
 *                                         the current time.
 *     @type string $post_modified_gmt     The date when the post was last modified in the GMT
 *                                         timezone. Default is the current time.
 *     @type int    $post_parent           Set this for the post it belongs to, if any. Default 0.
 *     @type int    $menu_order            The order the post should be displayed in. Default 0.
 *     @type string $post_mime_type        The mime type of the post. Default empty.
 *     @type string $guid                  Global Unique ID for referencing the post. Default empty.
 *     @type array  $post_category         Array of category names, slugs, or IDs.
 *                                         Defaults to value of the 'default_category' option.
 *     @type array  $tags_input            Array of tag names, slugs, or IDs. Default empty.
 *     @type array  $tax_input             Array of taxonomy terms keyed by their taxonomy name. Default empty.
 *     @type array  $meta_input            Array of post meta values keyed by their post meta key. Default empty.
 * }
 * @param bool  $wp_error Optional. Whether to return a WP_Error on failure. Default false.
 * @return int|WP_Error The post ID on success. The value 0 or WP_Error on failure.
 */
function wp_insert_post( $postarr, $wp_error = false ) {
	global $wpdb;

	// Capture original pre-sanitized array for passing into filters.
	$unsanitized_postarr = $postarr;

	$user_id = get_current_user_id();

	$defaults = array(
		'post_author' => $user_id,
		'post_content' => '',
		'post_content_filtered' => '',
		'post_title' => '',
		'post_excerpt' => '',
		'post_status' => 'draft',
		'post_type' => 'post',
		'comment_status' => '',
		'ping_status' => '',
		'post_password' => '',
		'to_ping' =>  '',
		'pinged' => '',
		'post_parent' => 0,
		'menu_order' => 0,
		'guid' => '',
		'import_id' => 0,
		'context' => '',
	);

	$postarr = wp_parse_args($postarr, $defaults);

	unset( $postarr[ 'filter' ] );

	$postarr = sanitize_post($postarr, 'db');

	// Are we updating or creating?
	$post_ID = 0;
	$update = false;
	$guid = $postarr['guid'];

	if ( ! empty( $postarr['ID'] ) ) {
		$update = true;

		// Get the post ID and GUID.
		$post_ID = $postarr['ID'];
		$post_before = get_post( $post_ID );
		if ( is_null( $post_before ) ) {
			if ( $wp_error ) {
				return new WP_Error( 'invalid_post', __( 'Invalid post ID.' ) );
			}
			return 0;
		}

		$guid = get_post_field( 'guid', $post_ID );
		$previous_status = get_post_field('post_status', $post_ID );
	} else {
		$previous_status = 'new';
	}

	$post_type = empty( $postarr['post_type'] ) ? 'post' : $postarr['post_type'];

	$post_title = $postarr['post_title'];
	$post_content = $postarr['post_content'];
	$post_excerpt = $postarr['post_excerpt'];
	if ( isset( $postarr['post_name'] ) ) {
		$post_name = $postarr['post_name'];
	} elseif ( $update ) {
		// For an update, don't modify the post_name if it wasn't supplied as an argument.
		$post_name = $post_before->post_name;
	}

	$maybe_empty = 'attachment' !== $post_type
		&& ! $post_content && ! $post_title && ! $post_excerpt
		&& post_type_supports( $post_type, 'editor' )
		&& post_type_supports( $post_type, 'title' )
		&& post_type_supports( $post_type, 'excerpt' );

	/**
	 * Filters whether the post should be considered "empty".
	 *
	 * The post is considered "empty" if both:
	 * 1. The post type supports the title, editor, and excerpt fields
	 * 2. The title, editor, and excerpt fields are all empty
	 *
	 * Returning a truthy value to the filter will effectively short-circuit
	 * the new post being inserted, returning 0. If $wp_error is true, a WP_Error
	 * will be returned instead.
	 *
	 * @since 3.3.0
	 *
	 * @param bool  $maybe_empty Whether the post should be considered "empty".
	 * @param array $postarr     Array of post data.
	 */
	if ( apply_filters( 'wp_insert_post_empty_content', $maybe_empty, $postarr ) ) {
		if ( $wp_error ) {
			return new WP_Error( 'empty_content', __( 'Content, title, and excerpt are empty.' ) );
		} else {
			return 0;
		}
	}

	$post_status = empty( $postarr['post_status'] ) ? 'draft' : $postarr['post_status'];
	if ( 'attachment' === $post_type && ! in_array( $post_status, array( 'inherit', 'private', 'trash', 'auto-draft' ), true ) ) {
		$post_status = 'inherit';
	}

	if ( ! empty( $postarr['post_category'] ) ) {
		// Filter out empty terms.
		$post_category = array_filter( $postarr['post_category'] );
	}

	// Make sure we set a valid category.
	if ( empty( $post_category ) || 0 == count( $post_category ) || ! is_array( $post_category ) ) {
		// 'post' requires at least one category.
		if ( 'post' == $post_type && 'auto-draft' != $post_status ) {
			$post_category = array( get_option('default_category') );
		} else {
			$post_category = array();
		}
	}

	// Don't allow contributors to set the post slug for pending review posts.
	if ( 'pending' == $post_status && !current_user_can( 'publish_posts' ) ) {
		$post_name = '';
	}

	/*
	 * Create a valid post name. Drafts and pending posts are allowed to have
	 * an empty post name.
	 */
	if ( empty($post_name) ) {
		if ( !in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ) ) ) {
			$post_name = sanitize_title($post_title);
		} else {
			$post_name = '';
		}
	} else {
		// On updates, we need to check to see if it's using the old, fixed sanitization context.
		$check_name = sanitize_title( $post_name, '', 'old-save' );
		if ( $update && strtolower( urlencode( $post_name ) ) == $check_name && get_post_field( 'post_name', $post_ID ) == $check_name ) {
			$post_name = $check_name;
		} else { // new post, or slug has changed.
			$post_name = sanitize_title($post_name);
		}
	}

	/*
	 * If the post date is empty (due to having been new or a draft) and status
	 * is not 'draft' or 'pending', set date to now.
	 */
	if ( empty( $postarr['post_date'] ) || '0000-00-00 00:00:00' == $postarr['post_date'] ) {
		if ( empty( $postarr['post_date_gmt'] ) || '0000-00-00 00:00:00' == $postarr['post_date_gmt'] ) {
			$post_date = current_time( 'mysql' );
		} else {
			$post_date = get_date_from_gmt( $postarr['post_date_gmt'] );
		}
	} else {
		$post_date = $postarr['post_date'];
	}

	// Validate the date.
	$mm = substr( $post_date, 5, 2 );
	$jj = substr( $post_date, 8, 2 );
	$aa = substr( $post_date, 0, 4 );
	$valid_date = wp_checkdate( $mm, $jj, $aa, $post_date );
	if ( ! $valid_date ) {
		if ( $wp_error ) {
			return new WP_Error( 'invalid_date', __( 'Invalid date.' ) );
		} else {
			return 0;
		}
	}

	if ( empty( $postarr['post_date_gmt'] ) || '0000-00-00 00:00:00' == $postarr['post_date_gmt'] ) {
		if ( ! in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ) ) ) {
			$post_date_gmt = get_gmt_from_date( $post_date );
		} else {
			$post_date_gmt = '0000-00-00 00:00:00';
		}
	} else {
		$post_date_gmt = $postarr['post_date_gmt'];
	}

	if ( $update || '0000-00-00 00:00:00' == $post_date ) {
		$post_modified     = current_time( 'mysql' );
		$post_modified_gmt = current_time( 'mysql', 1 );
	} else {
		$post_modified     = $post_date;
		$post_modified_gmt = $post_date_gmt;
	}

	if ( 'attachment' !== $post_type ) {
		if ( 'publish' == $post_status ) {
			$now = gmdate('Y-m-d H:i:59');
			if ( mysql2date('U', $post_date_gmt, false) > mysql2date('U', $now, false) ) {
				$post_status = 'future';
			}
		} elseif ( 'future' == $post_status ) {
			$now = gmdate('Y-m-d H:i:59');
			if ( mysql2date('U', $post_date_gmt, false) <= mysql2date('U', $now, false) ) {
				$post_status = 'publish';
			}
		}
	}

	// Comment status.
	if ( empty( $postarr['comment_status'] ) ) {
		if ( $update ) {
			$comment_status = 'closed';
		} else {
			$comment_status = get_default_comment_status( $post_type );
		}
	} else {
		$comment_status = $postarr['comment_status'];
	}

	// These variables are needed by compact() later.
	$post_content_filtered = $postarr['post_content_filtered'];
	$post_author = isset( $postarr['post_author'] ) ? $postarr['post_author'] : $user_id;
	$ping_status = empty( $postarr['ping_status'] ) ? get_default_comment_status( $post_type, 'pingback' ) : $postarr['ping_status'];
	$to_ping = isset( $postarr['to_ping'] ) ? sanitize_trackback_urls( $postarr['to_ping'] ) : '';
	$pinged = isset( $postarr['pinged'] ) ? $postarr['pinged'] : '';
	$import_id = isset( $postarr['import_id'] ) ? $postarr['import_id'] : 0;

	/*
	 * The 'wp_insert_post_parent' filter expects all variables to be present.
	 * Previously, these variables would have already been extracted
	 */
	if ( isset( $postarr['menu_order'] ) ) {
		$menu_order = (int) $postarr['menu_order'];
	} else {
		$menu_order = 0;
	}

	$post_password = isset( $postarr['post_password'] ) ? $postarr['post_password'] : '';
	if ( 'private' == $post_status ) {
		$post_password = '';
	}

	if ( isset( $postarr['post_parent'] ) ) {
		$post_parent = (int) $postarr['post_parent'];
	} else {
		$post_parent = 0;
	}

	$new_postarr = array_merge(
		array(
			'ID' => $post_ID,
		),
		compact( array_diff( array_keys( $defaults ), array( 'context', 'filter' ) ) )
	);

	/**
	 * Filters the post parent -- used to check for and prevent hierarchy loops.
	 *
	 * @since 3.1.0
	 *
	 * @param int   $post_parent Post parent ID.
	 * @param int   $post_ID     Post ID.
	 * @param array $new_postarr Array of parsed post data.
	 * @param array $postarr     Array of sanitized, but otherwise unmodified post data.
	 */
	$post_parent = apply_filters( 'wp_insert_post_parent', $post_parent, $post_ID, $new_postarr, $postarr );

	/*
	 * If the post is being untrashed and it has a desired slug stored in post meta,
	 * reassign it.
	 */
	if ( 'trash' === $previous_status && 'trash' !== $post_status ) {
		$desired_post_slug = get_post_meta( $post_ID, '_wp_desired_post_slug', true );
		if ( $desired_post_slug ) {
			delete_post_meta( $post_ID, '_wp_desired_post_slug' );
			$post_name = $desired_post_slug;
		}
	}

	// If a trashed post has the desired slug, change it and let this post have it.
	if ( 'trash' !== $post_status && $post_name ) {
		wp_add_trashed_suffix_to_post_name_for_trashed_posts( $post_name, $post_ID );
	}

	// When trashing an existing post, change its slug to allow non-trashed posts to use it.
	if ( 'trash' === $post_status && 'trash' !== $previous_status && 'new' !== $previous_status ) {
		$post_name = wp_add_trashed_suffix_to_post_name_for_post( $post_ID );
	}

	$post_name = wp_unique_post_slug( $post_name, $post_ID, $post_status, $post_type, $post_parent );

	// Don't unslash.
	$post_mime_type = isset( $postarr['post_mime_type'] ) ? $postarr['post_mime_type'] : '';

	// Expected_slashed (everything!).
	$data = compact( 'post_author', 'post_date', 'post_date_gmt', 'post_content', 'post_content_filtered', 'post_title', 'post_excerpt', 'post_status', 'post_type', 'comment_status', 'ping_status', 'post_password', 'post_name', 'to_ping', 'pinged', 'post_modified', 'post_modified_gmt', 'post_parent', 'menu_order', 'post_mime_type', 'guid' );

	$emoji_fields = array( 'post_title', 'post_content', 'post_excerpt' );

	foreach ( $emoji_fields as $emoji_field ) {
		if ( isset( $data[ $emoji_field ] ) ) {
			$charset = $wpdb->get_col_charset( $wpdb->posts, $emoji_field );
			if ( 'utf8' === $charset ) {
				$data[ $emoji_field ] = wp_encode_emoji( $data[ $emoji_field ] );
			}
		}
	}

	if ( 'attachment' === $post_type ) {
		/**
		 * Filters attachment post data before it is updated in or added to the database.
		 *
		 * @since 3.9.0
		 * @since 5.4.1 `$unsanitized_postarr` argument added.
		 *
		 * @param array $data                An array of slashed, sanitized, and processed attachment post data.
		 * @param array $postarr             An array of slashed and sanitized attachment post data, but not processed.
		 * @param array $unsanitized_postarr An array of slashed yet *unsanitized* and unprocessed attachment post data
		 *                                   as originally passed to wp_insert_post().
		 */
		$data = apply_filters( 'wp_insert_attachment_data', $data, $postarr, $unsanitized_postarr );
	} else {
		/**
		 * Filters slashed post data just before it is inserted into the database.
		 *
		 * @since 2.7.0
		 * @since 5.4.1 `$unsanitized_postarr` argument added.
		 *
		 * @param array $data                An array of slashed, sanitized, and processed post data.
		 * @param array $postarr             An array of sanitized (and slashed) but otherwise unmodified post data.
		 * @param array $unsanitized_postarr An array of slashed yet *unsanitized* and unprocessed post data as
		 *                                   originally passed to wp_insert_post().
		 */
		$data = apply_filters( 'wp_insert_post_data', $data, $postarr, $unsanitized_postarr );
	}
	$data = wp_unslash( $data );
	$where = array( 'ID' => $post_ID );

	if ( $update ) {
		/**
		 * Fires immediately before an existing post is updated in the database.
		 *
		 * @since 2.5.0
		 *
		 * @param int   $post_ID Post ID.
		 * @param array $data    Array of unslashed post data.
		 */
		do_action( 'pre_post_update', $post_ID, $data );
		if ( false === $wpdb->update( $wpdb->posts, $data, $where ) ) {
			if ( $wp_error ) {
				return new WP_Error('db_update_error', __('Could not update post in the database'), $wpdb->last_error);
			} else {
				return 0;
			}
		}
	} else {
		// If there is a suggested ID, use it if not already present.
		if ( ! empty( $import_id ) ) {
			$import_id = (int) $import_id;
			if ( ! $wpdb->get_var( $wpdb->prepare("SELECT ID FROM $wpdb->posts WHERE ID = %d", $import_id) ) ) {
				$data['ID'] = $import_id;
			}
		}
		if ( false === $wpdb->insert( $wpdb->posts, $data ) ) {
			if ( $wp_error ) {
				return new WP_Error('db_insert_error', __('Could not insert post into the database'), $wpdb->last_error);
			} else {
				return 0;
			}
		}
		$post_ID = (int) $wpdb->insert_id;

		// Use the newly generated $post_ID.
		$where = array( 'ID' => $post_ID );
	}

	if ( empty( $data['post_name'] ) && ! in_array( $data['post_status'], array( 'draft', 'pending', 'auto-draft' ) ) ) {
		$data['post_name'] = wp_unique_post_slug( sanitize_title( $data['post_title'], $post_ID ), $post_ID, $data['post_status'], $post_type, $post_parent );
		$wpdb->update( $wpdb->posts, array( 'post_name' => $data['post_name'] ), $where );
		clean_post_cache( $post_ID );
	}

	if ( is_object_in_taxonomy( $post_type, 'category' ) ) {
		wp_set_post_categories( $post_ID, $post_category );
	}

	if ( isset( $postarr['tags_input'] ) && is_object_in_taxonomy( $post_type, 'post_tag' ) ) {
		wp_set_post_tags( $post_ID, $postarr['tags_input'] );
	}

	// New-style support for all custom taxonomies.
	if ( ! empty( $postarr['tax_input'] ) ) {
		foreach ( $postarr['tax_input'] as $taxonomy => $tags ) {
			$taxonomy_obj = get_taxonomy($taxonomy);
			if ( ! $taxonomy_obj ) {
				/* translators: %s: taxonomy name */
				_doing_it_wrong( __FUNCTION__, sprintf( __( 'Invalid taxonomy: %s.' ), $taxonomy ), '4.4.0' );
				continue;
			}

			// array = hierarchical, string = non-hierarchical.
			if ( is_array( $tags ) ) {
				$tags = array_filter($tags);
			}
			if ( current_user_can( $taxonomy_obj->cap->assign_terms ) ) {
				wp_set_post_terms( $post_ID, $tags, $taxonomy );
			}
		}
	}

	if ( ! empty( $postarr['meta_input'] ) ) {
		foreach ( $postarr['meta_input'] as $field => $value ) {
			update_post_meta( $post_ID, $field, $value );
		}
	}

	$current_guid = get_post_field( 'guid', $post_ID );

	// Set GUID.
	if ( ! $update && '' == $current_guid ) {
		$wpdb->update( $wpdb->posts, array( 'guid' => get_permalink( $post_ID ) ), $where );
	}

	if ( 'attachment' === $postarr['post_type'] ) {
		if ( ! empty( $postarr['file'] ) ) {
			update_attached_file( $post_ID, $postarr['file'] );
		}

		if ( ! empty( $postarr['context'] ) ) {
			add_post_meta( $post_ID, '_wp_attachment_context', $postarr['context'], true );
		}
	}

	// Set or remove featured image.
	if ( isset( $postarr['_thumbnail_id'] ) ) {
		$thumbnail_support = current_theme_supports( 'post-thumbnails', $post_type ) && post_type_supports( $post_type, 'thumbnail' ) || 'revision' === $post_type;
		if ( ! $thumbnail_support && 'attachment' === $post_type && $post_mime_type ) {
			if ( wp_attachment_is( 'audio', $post_ID ) ) {
				$thumbnail_support = post_type_supports( 'attachment:audio', 'thumbnail' ) || current_theme_supports( 'post-thumbnails', 'attachment:audio' );
			} elseif ( wp_attachment_is( 'video', $post_ID ) ) {
				$thumbnail_support = post_type_supports( 'attachment:video', 'thumbnail' ) || current_theme_supports( 'post-thumbnails', 'attachment:video' );
			}
		}

		if ( $thumbnail_support ) {
			$thumbnail_id = intval( $postarr['_thumbnail_id'] );
			if ( -1 === $thumbnail_id ) {
				delete_post_thumbnail( $post_ID );
			} else {
				set_post_thumbnail( $post_ID, $thumbnail_id );
			}
		}
	}

	clean_post_cache( $post_ID );

	$post = get_post( $post_ID );

	if ( ! empty( $postarr['page_template'] ) ) {
		$post->page_template = $postarr['page_template'];
		$page_templates = wp_get_theme()->get_page_templates( $post );
		if ( 'default' != $postarr['page_template'] && ! isset( $page_templates[ $postarr['page_template'] ] ) ) {
			if ( $wp_error ) {
				return new WP_Error( 'invalid_page_template', __( 'Invalid page template.' ) );
			}
			update_post_meta( $post_ID, '_wp_page_template', 'default' );
		} else {
			update_post_meta( $post_ID, '_wp_page_template', $postarr['page_template'] );
		}
	}

	if ( 'attachment' !== $postarr['post_type'] ) {
		wp_transition_post_status( $data['post_status'], $previous_status, $post );
	} else {
		if ( $update ) {
			/**
			 * Fires once an existing attachment has been updated.
			 *
			 * @since 2.0.0
			 *
			 * @param int $post_ID Attachment ID.
			 */
			do_action( 'edit_attachment', $post_ID );
			$post_after = get_post( $post_ID );

			/**
			 * Fires once an existing attachment has been updated.
			 *
			 * @since 4.4.0
			 *
			 * @param int     $post_ID      Post ID.
			 * @param WP_Post $post_after   Post object following the update.
			 * @param WP_Post $post_before  Post object before the update.
			 */
			do_action( 'attachment_updated', $post_ID, $post_after, $post_before );
		} else {

			/**
			 * Fires once an attachment has been added.
			 *
			 * @since 2.0.0
			 *
			 * @param int $post_ID Attachment ID.
			 */
			do_action( 'add_attachment', $post_ID );
		}

		return $post_ID;
	}

	if ( $update ) {
		/**
		 * Fires once an existing post has been updated.
		 *
		 * @since 1.2.0
		 *
		 * @param int     $post_ID Post ID.
		 * @param WP_Post $post    Post object.
		 */
		do_action( 'edit_post', $post_ID, $post );
		$post_after = get_post($post_ID);

		/**
		 * Fires once an existing post has been updated.
		 *
		 * @since 3.0.0
		 *
		 * @param int     $post_ID      Post ID.
		 * @param WP_Post $post_after   Post object following the update.
		 * @param WP_Post $post_before  Post object before the update.
		 */
		do_action( 'post_updated', $post_ID, $post_after, $post_before);
	}

	/**
	 * Fires once a post has been saved.
	 *
	 * The dynamic portion of the hook name, `$post->post_type`, refers to
	 * the post type slug.
	 *
	 * @since 3.7.0
	 *
	 * @param int     $post_ID Post ID.
	 * @param WP_Post $post    Post object.
	 * @param bool    $update  Whether this is an existing post being updated or not.
	 */
	do_action( "save_post_{$post->post_type}", $post_ID, $post, $update );

	/**
	 * Fires once a post has been saved.
	 *
	 * @since 1.5.0
	 *
	 * @param int     $post_ID Post ID.
	 * @param WP_Post $post    Post object.
	 * @param bool    $update  Whether this is an existing post being updated or not.
	 */
	do_action( 'save_post', $post_ID, $post, $update );

	/**
	 * Fires once a post has been saved.
	 *
	 * @since 2.0.0
	 *
	 * @param int     $post_ID Post ID.
	 * @param WP_Post $post    Post object.
	 * @param bool    $update  Whether this is an existing post being updated or not.
	 */
	do_action( 'wp_insert_post', $post_ID, $post, $update );

	return $post_ID;
}

/**
 * Update a post with new post data.
 *
 * The date does not have to be set for drafts. You can set the date and it will
 * not be overridden.
 *
 * @since 1.0.0
 *
 * @param array|object $postarr  Optional. Post data. Arrays are expected to be escaped,
 *                               objects are not. Default array.
 * @param bool         $wp_error Optional. Allow return of WP_Error on failure. Default false.
 * @return int|WP_Error The value 0 or WP_Error on failure. The post ID on success.
 */
function wp_update_post( $postarr = array(), $wp_error = false ) {
	if ( is_object($postarr) ) {
		// Non-escaped post was passed.
		$postarr = get_object_vars($postarr);
		$postarr = wp_slash($postarr);
	}

	// First, get all of the original fields.
	$post = get_post($postarr['ID'], ARRAY_A);

	if ( is_null( $post ) ) {
		if ( $wp_error )
			return new WP_Error( 'invalid_post', __( 'Invalid post ID.' ) );
		return 0;
	}

	// Escape data pulled from DB.
	$post = wp_slash($post);

	// Passed post category list overwrites existing category list if not empty.
	if ( isset($postarr['post_category']) && is_array($postarr['post_category'])
			 && 0 != count($postarr['post_category']) )
		$post_cats = $postarr['post_category'];
	else
		$post_cats = $post['post_category'];

	// Drafts shouldn't be assigned a date unless explicitly done so by the user.
	if ( isset( $post['post_status'] ) && in_array($post['post_status'], array('draft', 'pending', 'auto-draft')) && empty($postarr['edit_date']) &&
			 ('0000-00-00 00:00:00' == $post['post_date_gmt']) )
		$clear_date = true;
	else
		$clear_date = false;

	// Merge old and new fields with new fields overwriting old ones.
	$postarr = array_merge($post, $postarr);
	$postarr['post_category'] = $post_cats;
	if ( $clear_date ) {
		$postarr['post_date'] = current_time('mysql');
		$postarr['post_date_gmt'] = '';
	}

	if ($postarr['post_type'] == 'attachment')
		return wp_insert_attachment($postarr);

	return wp_insert_post( $postarr, $wp_error );
}

/**
 * Publish a post by transitioning the post status.
 *
 * @since 2.1.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int|WP_Post $post Post ID or post object.
 */
function wp_publish_post( $post ) {
	global $wpdb;

	if ( ! $post = get_post( $post ) )
		return;

	if ( 'publish' == $post->post_status )
		return;

	$wpdb->update( $wpdb->posts, array( 'post_status' => 'publish' ), array( 'ID' => $post->ID ) );

	clean_post_cache( $post->ID );

	$old_status = $post->post_status;
	$post->post_status = 'publish';
	wp_transition_post_status( 'publish', $old_status, $post );

	/** This action is documented in wp-includes/post.php */
	do_action( 'edit_post', $post->ID, $post );

	/** This action is documented in wp-includes/post.php */
	do_action( "save_post_{$post->post_type}", $post->ID, $post, true );

	/** This action is documented in wp-includes/post.php */
	do_action( 'save_post', $post->ID, $post, true );

	/** This action is documented in wp-includes/post.php */
	do_action( 'wp_insert_post', $post->ID, $post, true );
}

/**
 * Publish future post and make sure post ID has future post status.
 *
 * Invoked by cron 'publish_future_post' event. This safeguard prevents cron
 * from publishing drafts, etc.
 *
 * @since 2.5.0
 *
 * @param int|WP_Post $post_id Post ID or post object.
 */
function check_and_publish_future_post( $post_id ) {
	$post = get_post($post_id);

	if ( empty($post) )
		return;

	if ( 'future' != $post->post_status )
		return;

	$time = strtotime( $post->post_date_gmt . ' GMT' );

	// Uh oh, someone jumped the gun!
	if ( $time > time() ) {
		wp_clear_scheduled_hook( 'publish_future_post', array( $post_id ) ); // clear anything else in the system
		wp_schedule_single_event( $time, 'publish_future_post', array( $post_id ) );
		return;
	}

	// wp_publish_post() returns no meaningful value.
	wp_publish_post( $post_id );
}

/**
 * Computes a unique slug for the post, when given the desired slug and some post details.
 *
 * @since 2.8.0
 *
 * @global wpdb       $wpdb WordPress database abstraction object.
 * @global WP_Rewrite $wp_rewrite
 *
 * @param string $slug        The desired slug (post_name).
 * @param int    $post_ID     Post ID.
 * @param string $post_status No uniqueness checks are made if the post is still draft or pending.
 * @param string $post_type   Post type.
 * @param int    $post_parent Post parent ID.
 * @return string Unique slug for the post, based on $post_name (with a -1, -2, etc. suffix)
 */
function wp_unique_post_slug( $slug, $post_ID, $post_status, $post_type, $post_parent ) {
	if ( in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ) ) || ( 'inherit' == $post_status && 'revision' == $post_type ) || 'user_request' === $post_type )
		return $slug;

	global $wpdb, $wp_rewrite;

	$original_slug = $slug;

	$feeds = $wp_rewrite->feeds;
	if ( ! is_array( $feeds ) )
		$feeds = array();

	if ( 'attachment' == $post_type ) {
		// Attachment slugs must be unique across all types.
		$check_sql = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND ID != %d LIMIT 1";
		$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_ID ) );

		/**
		 * Filters whether the post slug would make a bad attachment slug.
		 *
		 * @since 3.1.0
		 *
		 * @param bool   $bad_slug Whether the slug would be bad as an attachment slug.
		 * @param string $slug     The post slug.
		 */
		if ( $post_name_check || in_array( $slug, $feeds ) || 'embed' === $slug || apply_filters( 'wp_unique_post_slug_is_bad_attachment_slug', false, $slug ) ) {
			$suffix = 2;
			do {
				$alt_post_name = _truncate_post_slug( $slug, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix";
				$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_ID ) );
				$suffix++;
			} while ( $post_name_check );
			$slug = $alt_post_name;
		}
	} elseif ( is_post_type_hierarchical( $post_type ) ) {
		if ( 'nav_menu_item' == $post_type )
			return $slug;

		/*
		 * Page slugs must be unique within their own trees. Pages are in a separate
		 * namespace than posts so page slugs are allowed to overlap post slugs.
		 */
		$check_sql = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND post_type IN ( %s, 'attachment' ) AND ID != %d AND post_parent = %d LIMIT 1";
		$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_type, $post_ID, $post_parent ) );

		/**
		 * Filters whether the post slug would make a bad hierarchical post slug.
		 *
		 * @since 3.1.0
		 *
		 * @param bool   $bad_slug    Whether the post slug would be bad in a hierarchical post context.
		 * @param string $slug        The post slug.
		 * @param string $post_type   Post type.
		 * @param int    $post_parent Post parent ID.
		 */
		if ( $post_name_check || in_array( $slug, $feeds ) || 'embed' === $slug || preg_match( "@^($wp_rewrite->pagination_base)?\d+$@", $slug )  || apply_filters( 'wp_unique_post_slug_is_bad_hierarchical_slug', false, $slug, $post_type, $post_parent ) ) {
			$suffix = 2;
			do {
				$alt_post_name = _truncate_post_slug( $slug, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix";
				$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_type, $post_ID, $post_parent ) );
				$suffix++;
			} while ( $post_name_check );
			$slug = $alt_post_name;
		}
	} else {
		// Post slugs must be unique across all posts.
		$check_sql = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND post_type = %s AND ID != %d LIMIT 1";
		$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_type, $post_ID ) );

		// Prevent new post slugs that could result in URLs that conflict with date archives.
		$post = get_post( $post_ID );
		$conflicts_with_date_archive = false;
		if ( 'post' === $post_type && ( ! $post || $post->post_name !== $slug ) && preg_match( '/^[0-9]+$/', $slug ) && $slug_num = intval( $slug ) ) {
			$permastructs   = array_values( array_filter( explode( '/', get_option( 'permalink_structure' ) ) ) );
			$postname_index = array_search( '%postname%', $permastructs );

			/*
			 * Potential date clashes are as follows:
			 *
			 * - Any integer in the first permastruct position could be a year.
			 * - An integer between 1 and 12 that follows 'year' conflicts with 'monthnum'.
			 * - An integer between 1 and 31 that follows 'monthnum' conflicts with 'day'.
			 */
			if ( 0 === $postname_index ||
				( $postname_index && '%year%' === $permastructs[ $postname_index - 1 ] && 13 > $slug_num ) ||
				( $postname_index && '%monthnum%' === $permastructs[ $postname_index - 1 ] && 32 > $slug_num )
			) {
				$conflicts_with_date_archive = true;
			}
		}

		/**
		 * Filters whether the post slug would be bad as a flat slug.
		 *
		 * @since 3.1.0
		 *
		 * @param bool   $bad_slug  Whether the post slug would be bad as a flat slug.
		 * @param string $slug      The post slug.
		 * @param string $post_type Post type.
		 */
		if ( $post_name_check || in_array( $slug, $feeds ) || 'embed' === $slug || $conflicts_with_date_archive || apply_filters( 'wp_unique_post_slug_is_bad_flat_slug', false, $slug, $post_type ) ) {
			$suffix = 2;
			do {
				$alt_post_name = _truncate_post_slug( $slug, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix";
				$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_type, $post_ID ) );
				$suffix++;
			} while ( $post_name_check );
			$slug = $alt_post_name;
		}
	}

	/**
	 * Filters the unique post slug.
	 *
	 * @since 3.3.0
	 *
	 * @param string $slug          The post slug.
	 * @param int    $post_ID       Post ID.
	 * @param string $post_status   The post status.
	 * @param string $post_type     Post type.
	 * @param int    $post_parent   Post parent ID
	 * @param string $original_slug The original post slug.
	 */
	return apply_filters( 'wp_unique_post_slug', $slug, $post_ID, $post_status, $post_type, $post_parent, $original_slug );
}

/**
 * Truncate a post slug.
 *
 * @since 3.6.0
 * @access private
 *
 * @see utf8_uri_encode()
 *
 * @param string $slug   The slug to truncate.
 * @param int    $length Optional. Max length of the slug. Default 200 (characters).
 * @return string The truncated slug.
 */
function _truncate_post_slug( $slug, $length = 200 ) {
	if ( strlen( $slug ) > $length ) {
		$decoded_slug = urldecode( $slug );
		if ( $decoded_slug === $slug )
			$slug = substr( $slug, 0, $length );
		else
			$slug = utf8_uri_encode( $decoded_slug, $length, true );
	}

	return rtrim( $slug, '-' );
}

/**
 * Add tags to a post.
 *
 * @see wp_set_post_tags()
 *
 * @since 2.3.0
 *
 * @param int          $post_id Optional. The Post ID. Does not default to the ID of the global $post.
 * @param string|array $tags    Optional. An array of tags to set for the post, or a string of tags
 *                              separated by commas. Default empty.
 * @return array|false|WP_Error Array of affected term IDs. WP_Error or false on failure.
 */
function wp_add_post_tags( $post_id = 0, $tags = '' ) {
	return wp_set_post_tags($post_id, $tags, true);
}

/**
 * Set the tags for a post.
 *
 * @since 2.3.0
 *
 * @see wp_set_object_terms()
 *
 * @param int          $post_id Optional. The Post ID. Does not default to the ID of the global $post.
 * @param string|array $tags    Optional. An array of tags to set for the post, or a string of tags
 *                              separated by commas. Default empty.
 * @param bool         $append  Optional. If true, don't delete existing tags, just add on. If false,
 *                              replace the tags with the new tags. Default false.
 * @return array|false|WP_Error Array of term taxonomy IDs of affected terms. WP_Error or false on failure.
 */
function wp_set_post_tags( $post_id = 0, $tags = '', $append = false ) {
	return wp_set_post_terms( $post_id, $tags, 'post_tag', $append);
}

/**
 * Set the terms for a post.
 *
 * @since 2.8.0
 *
 * @see wp_set_object_terms()
 *
 * @param int          $post_id  Optional. The Post ID. Does not default to the ID of the global $post.
 * @param string|array $tags     Optional. An array of terms to set for the post, or a string of terms
 *                               separated by commas. Default empty.
 * @param string       $taxonomy Optional. Taxonomy name. Default 'post_tag'.
 * @param bool         $append   Optional. If true, don't delete existing terms, just add on. If false,
 *                               replace the terms with the new terms. Default false.
 * @return array|false|WP_Error Array of term taxonomy IDs of affected terms. WP_Error or false on failure.
 */
function wp_set_post_terms( $post_id = 0, $tags = '', $taxonomy = 'post_tag', $append = false ) {
	$post_id = (int) $post_id;

	if ( !$post_id )
		return false;

	if ( empty($tags) )
		$tags = array();

	if ( ! is_array( $tags ) ) {
		$comma = _x( ',', 'tag delimiter' );
		if ( ',' !== $comma )
			$tags = str_replace( $comma, ',', $tags );
		$tags = explode( ',', trim( $tags, " \n\t\r\0\x0B," ) );
	}

	/*
	 * Hierarchical taxonomies must always pass IDs rather than names so that
	 * children with the same names but different parents aren't confused.
	 */
	if ( is_taxonomy_hierarchical( $taxonomy ) ) {
		$tags = array_unique( array_map( 'intval', $tags ) );
	}

	return wp_set_object_terms( $post_id, $tags, $taxonomy, $append );
}

/**
 * Set categories for a post.
 *
 * If the post categories parameter is not set, then the default category is
 * going used.
 *
 * @since 2.1.0
 *
 * @param int       $post_ID         Optional. The Post ID. Does not default to the ID
 *                                   of the global $post. Default 0.
 * @param array|int $post_categories Optional. List of categories or ID of category.
 *                                   Default empty array.
 * @param bool      $append         If true, don't delete existing categories, just add on.
 *                                  If false, replace the categories with the new categories.
 * @return array|false|WP_Error Array of term taxonomy IDs of affected categories. WP_Error or false on failure.
 */
function wp_set_post_categories( $post_ID = 0, $post_categories = array(), $append = false ) {
	$post_ID = (int) $post_ID;
	$post_type = get_post_type( $post_ID );
	$post_status = get_post_status( $post_ID );
	// If $post_categories isn't already an array, make it one:
	$post_categories = (array) $post_categories;
	if ( empty( $post_categories ) ) {
		if ( 'post' == $post_type && 'auto-draft' != $post_status ) {
			$post_categories = array( get_option('default_category') );
			$append = false;
		} else {
			$post_categories = array();
		}
	} elseif ( 1 == count( $post_categories ) && '' == reset( $post_categories ) ) {
		return true;
	}

	return wp_set_post_terms( $post_ID, $post_categories, 'category', $append );
}

/**
 * Fires actions related to the transitioning of a post's status.
 *
 * When a post is saved, the post status is "transitioned" from one status to another,
 * though this does not always mean the status has actually changed before and after
 * the save. This function fires a number of action hooks related to that transition:
 * the generic {@see 'transition_post_status'} action, as well as the dynamic hooks
 * {@see '$old_status_to_$new_status'} and {@see '$new_status_$post->post_type'}. Note
 * that the function does not transition the post object in the database.
 *
 * For instance: When publishing a post for the first time, the post status may transition
 * from 'draft' – or some other status – to 'publish'. However, if a post is already
 * published and is simply being updated, the "old" and "new" statuses may both be 'publish'
 * before and after the transition.
 *
 * @since 2.3.0
 *
 * @param string  $new_status Transition to this post status.
 * @param string  $old_status Previous post status.
 * @param WP_Post $post Post data.
 */
function wp_transition_post_status( $new_status, $old_status, $post ) {
	/**
	 * Fires when a post is transitioned from one status to another.
	 *
	 * @since 2.3.0
	 *
	 * @param string  $new_status New post status.
	 * @param string  $old_status Old post status.
	 * @param WP_Post $post       Post object.
	 */
	do_action( 'transition_post_status', $new_status, $old_status, $post );

	/**
	 * Fires when a post is transitioned from one status to another.
	 *
	 * The dynamic portions of the hook name, `$new_status` and `$old status`,
	 * refer to the old and new post statuses, respectively.
	 *
	 * @since 2.3.0
	 *
	 * @param WP_Post $post Post object.
	 */
	do_action( "{$old_status}_to_{$new_status}", $post );

	/**
	 * Fires when a post is transitioned from one status to another.
	 *
	 * The dynamic portions of the hook name, `$new_status` and `$post->post_type`,
	 * refer to the new post status and post type, respectively.
	 *
	 * Please note: When this action is hooked using a particular post status (like
	 * 'publish', as `publish_{$post->post_type}`), it will fire both when a post is
	 * first transitioned to that status from something else, as well as upon
	 * subsequent post updates (old and new status are both the same).
	 *
	 * Therefore, if you are looking to only fire a callback when a post is first
	 * transitioned to a status, use the {@see 'transition_post_status'} hook instead.
	 *
	 * @since 2.3.0
	 *
	 * @param int     $post_id Post ID.
	 * @param WP_Post $post    Post object.
	 */
	do_action( "{$new_status}_{$post->post_type}", $post->ID, $post );
}

//
// Comment, trackback, and pingback functions.
//

/**
 * Add a URL to those already pinged.
 *
 * @since 1.5.0
 * @since 4.7.0 $post_id can be a WP_Post object.
 * @since 4.7.0 $uri can be an array of URIs.
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int|WP_Post  $post_id Post object or ID.
 * @param string|array $uri     Ping URI or array of URIs.
 * @return int|false How many rows were updated.
 */
function add_ping( $post_id, $uri ) {
	global $wpdb;

	$post = get_post( $post_id );
	if ( ! $post ) {
		return false;
	}

	$pung = trim( $post->pinged );
	$pung = preg_split( '/\s/', $pung );

	if ( is_array( $uri ) ) {
		$pung = array_merge( $pung, $uri );
	}
	else {
		$pung[] = $uri;
	}
	$new = implode("\n", $pung);

	/**
	 * Filters the new ping URL to add for the given post.
	 *
	 * @since 2.0.0
	 *
	 * @param string $new New ping URL to add.
	 */
	$new = apply_filters( 'add_ping', $new );

	$return = $wpdb->update( $wpdb->posts, array( 'pinged' => $new ), array( 'ID' => $post->ID ) );
	clean_post_cache( $post->ID );
	return $return;
}

/**
 * Retrieve enclosures already enclosed for a post.
 *
 * @since 1.5.0
 *
 * @param int $post_id Post ID.
 * @return array List of enclosures.
 */
function get_enclosed( $post_id ) {
	$custom_fields = get_post_custom( $post_id );
	$pung = array();
	if ( !is_array( $custom_fields ) )
		return $pung;

	foreach ( $custom_fields as $key => $val ) {
		if ( 'enclosure' != $key || !is_array( $val ) )
			continue;
		foreach ( $val as $enc ) {
			$enclosure = explode( "\n", $enc );
			$pung[] = trim( $enclosure[ 0 ] );
		}
	}

	/**
	 * Filters the list of enclosures already enclosed for the given post.
	 *
	 * @since 2.0.0
	 *
	 * @param array $pung    Array of enclosures for the given post.
	 * @param int   $post_id Post ID.
	 */
	return apply_filters( 'get_enclosed', $pung, $post_id );
}

/**
 * Retrieve URLs already pinged for a post.
 *
 * @since 1.5.0
 *
 * @since 4.7.0 $post_id can be a WP_Post object.
 *
 * @param int|WP_Post $post_id Post ID or object.
 * @return array
 */
function get_pung( $post_id ) {
	$post = get_post( $post_id );
	if ( ! $post ) {
		return false;
	}

	$pung = trim( $post->pinged );
	$pung = preg_split( '/\s/', $pung );

	/**
	 * Filters the list of already-pinged URLs for the given post.
	 *
	 * @since 2.0.0
	 *
	 * @param array $pung Array of URLs already pinged for the given post.
	 */
	return apply_filters( 'get_pung', $pung );
}

/**
 * Retrieve URLs that need to be pinged.
 *
 * @since 1.5.0
 * @since 4.7.0 $post_id can be a WP_Post object.
 *
 * @param int|WP_Post $post_id Post Object or ID
 * @return array
 */
function get_to_ping( $post_id ) {
	$post = get_post( $post_id );

	if ( ! $post ) {
		return false;
	}

	$to_ping = sanitize_trackback_urls( $post->to_ping );
	$to_ping = preg_split('/\s/', $to_ping, -1, PREG_SPLIT_NO_EMPTY);

	/**
	 * Filters the list of URLs yet to ping for the given post.
	 *
	 * @since 2.0.0
	 *
	 * @param array $to_ping List of URLs yet to ping.
	 */
	return apply_filters( 'get_to_ping', $to_ping );
}

/**
 * Do trackbacks for a list of URLs.
 *
 * @since 1.0.0
 *
 * @param string $tb_list Comma separated list of URLs.
 * @param int    $post_id Post ID.
 */
function trackback_url_list( $tb_list, $post_id ) {
	if ( ! empty( $tb_list ) ) {
		// Get post data.
		$postdata = get_post( $post_id, ARRAY_A );

		// Form an excerpt.
		$excerpt = strip_tags( $postdata['post_excerpt'] ? $postdata['post_excerpt'] : $postdata['post_content'] );

		if ( strlen( $excerpt ) > 255 ) {
			$excerpt = substr( $excerpt, 0, 252 ) . '&hellip;';
		}

		$trackback_urls = explode( ',', $tb_list );
		foreach ( (array) $trackback_urls as $tb_url ) {
			$tb_url = trim( $tb_url );
			trackback( $tb_url, wp_unslash( $postdata['post_title'] ), $excerpt, $post_id );
		}
	}
}

//
// Page functions
//

/**
 * Get a list of page IDs.
 *
 * @since 2.0.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @return array List of page IDs.
 */
function get_all_page_ids() {
	global $wpdb;

	$page_ids = wp_cache_get('all_page_ids', 'posts');
	if ( ! is_array( $page_ids ) ) {
		$page_ids = $wpdb->get_col("SELECT ID FROM $wpdb->posts WHERE post_type = 'page'");
		wp_cache_add('all_page_ids', $page_ids, 'posts');
	}

	return $page_ids;
}

/**
 * Retrieves page data given a page ID or page object.
 *
 * Use get_post() instead of get_page().
 *
 * @since 1.5.1
 * @deprecated 3.5.0 Use get_post()
 *
 * @param mixed  $page   Page object or page ID. Passed by reference.
 * @param string $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
 *                       a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
 * @param string $filter Optional. How the return value should be filtered. Accepts 'raw',
 *                       'edit', 'db', 'display'. Default 'raw'.
 * @return WP_Post|array|null WP_Post (or array) on success, or null on failure.
 */
function get_page( $page, $output = OBJECT, $filter = 'raw') {
	return get_post( $page, $output, $filter );
}

/**
 * Retrieves a page given its path.
 *
 * @since 2.1.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string       $page_path Page path.
 * @param string       $output    Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
 *                                a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
 * @param string|array $post_type Optional. Post type or array of post types. Default 'page'.
 * @return WP_Post|array|null WP_Post (or array) on success, or null on failure.
 */
function get_page_by_path( $page_path, $output = OBJECT, $post_type = 'page' ) {
	global $wpdb;

	$last_changed = wp_cache_get_last_changed( 'posts' );

	$hash = md5( $page_path . serialize( $post_type ) );
	$cache_key = "get_page_by_path:$hash:$last_changed";
	$cached = wp_cache_get( $cache_key, 'posts' );
	if ( false !== $cached ) {
		// Special case: '0' is a bad `$page_path`.
		if ( '0' === $cached || 0 === $cached ) {
			return;
		} else {
			return get_post( $cached, $output );
		}
	}

	$page_path = rawurlencode(urldecode($page_path));
	$page_path = str_replace('%2F', '/', $page_path);
	$page_path = str_replace('%20', ' ', $page_path);
	$parts = explode( '/', trim( $page_path, '/' ) );
	$parts = array_map( 'sanitize_title_for_query', $parts );
	$escaped_parts = esc_sql( $parts );

	$in_string = "'" . implode( "','", $escaped_parts ) . "'";

	if ( is_array( $post_type ) ) {
		$post_types = $post_type;
	} else {
		$post_types = array( $post_type, 'attachment' );
	}

	$post_types = esc_sql( $post_types );
	$post_type_in_string = "'" . implode( "','", $post_types ) . "'";
	$sql = "
		SELECT ID, post_name, post_parent, post_type
		FROM $wpdb->posts
		WHERE post_name IN ($in_string)
		AND post_type IN ($post_type_in_string)
	";

	$pages = $wpdb->get_results( $sql, OBJECT_K );

	$revparts = array_reverse( $parts );

	$foundid = 0;
	foreach ( (array) $pages as $page ) {
		if ( $page->post_name == $revparts[0] ) {
			$count = 0;
			$p = $page;

			/*
			 * Loop through the given path parts from right to left,
			 * ensuring each matches the post ancestry.
			 */
			while ( $p->post_parent != 0 && isset( $pages[ $p->post_parent ] ) ) {
				$count++;
				$parent = $pages[ $p->post_parent ];
				if ( ! isset( $revparts[ $count ] ) || $parent->post_name != $revparts[ $count ] )
					break;
				$p = $parent;
			}

			if ( $p->post_parent == 0 && $count+1 == count( $revparts ) && $p->post_name == $revparts[ $count ] ) {
				$foundid = $page->ID;
				if ( $page->post_type == $post_type )
					break;
			}
		}
	}

	// We cache misses as well as hits.
	wp_cache_set( $cache_key, $foundid, 'posts' );

	if ( $foundid ) {
		return get_post( $foundid, $output );
	}
}

/**
 * Retrieve a page given its title.
 *
 * @since 2.1.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string       $page_title Page title
 * @param string       $output     Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
 *                                 a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
 * @param string|array $post_type  Optional. Post type or array of post types. Default 'page'.
 * @return WP_Post|array|null WP_Post (or array) on success, or null on failure.
 */
function get_page_by_title( $page_title, $output = OBJECT, $post_type = 'page' ) {
	global $wpdb;

	if ( is_array( $post_type ) ) {
		$post_type = esc_sql( $post_type );
		$post_type_in_string = "'" . implode( "','", $post_type ) . "'";
		$sql = $wpdb->prepare( "
			SELECT ID
			FROM $wpdb->posts
			WHERE post_title = %s
			AND post_type IN ($post_type_in_string)
		", $page_title );
	} else {
		$sql = $wpdb->prepare( "
			SELECT ID
			FROM $wpdb->posts
			WHERE post_title = %s
			AND post_type = %s
		", $page_title, $post_type );
	}

	$page = $wpdb->get_var( $sql );

	if ( $page ) {
		return get_post( $page, $output );
	}
}

/**
 * Identify descendants of a given page ID in a list of page objects.
 *
 * Descendants are identified from the `$pages` array passed to the function. No database queries are performed.
 *
 * @since 1.5.1
 *
 * @param int   $page_id Page ID.
 * @param array $pages   List of page objects from which descendants should be identified.
 * @return array List of page children.
 */
function get_page_children( $page_id, $pages ) {
	// Build a hash of ID -> children.
	$children = array();
	foreach ( (array) $pages as $page ) {
		$children[ intval( $page->post_parent ) ][] = $page;
	}

	$page_list = array();

	// Start the search by looking at immediate children.
	if ( isset( $children[ $page_id ] ) ) {
		// Always start at the end of the stack in order to preserve original `$pages` order.
		$to_look = array_reverse( $children[ $page_id ] );

		while ( $to_look ) {
			$p = array_pop( $to_look );
			$page_list[] = $p;
			if ( isset( $children[ $p->ID ] ) ) {
				foreach ( array_reverse( $children[ $p->ID ] ) as $child ) {
					// Append to the `$to_look` stack to descend the tree.
					$to_look[] = $child;
				}
			}
		}
	}

	return $page_list;
}

/**
 * Order the pages with children under parents in a flat list.
 *
 * It uses auxiliary structure to hold parent-children relationships and
 * runs in O(N) complexity
 *
 * @since 2.0.0
 *
 * @param array $pages   Posts array (passed by reference).
 * @param int   $page_id Optional. Parent page ID. Default 0.
 * @return array A list arranged by hierarchy. Children immediately follow their parents.
 */
function get_page_hierarchy( &$pages, $page_id = 0 ) {
	if ( empty( $pages ) ) {
		return array();
	}

	$children = array();
	foreach ( (array) $pages as $p ) {
		$parent_id = intval( $p->post_parent );
		$children[ $parent_id ][] = $p;
	}

	$result = array();
	_page_traverse_name( $page_id, $children, $result );

	return $result;
}

/**
 * Traverse and return all the nested children post names of a root page.
 *
 * $children contains parent-children relations
 *
 * @since 2.9.0
 *
 * @see _page_traverse_name()
 *
 * @param int   $page_id   Page ID.
 * @param array $children  Parent-children relations (passed by reference).
 * @param array $result    Result (passed by reference).
 */
function _page_traverse_name( $page_id, &$children, &$result ){
	if ( isset( $children[ $page_id ] ) ){
		foreach ( (array)$children[ $page_id ] as $child ) {
			$result[ $child->ID ] = $child->post_name;
			_page_traverse_name( $child->ID, $children, $result );
		}
	}
}

/**
 * Build the URI path for a page.
 *
 * Sub pages will be in the "directory" under the parent page post name.
 *
 * @since 1.5.0
 * @since 4.6.0 Converted the `$page` parameter to optional.
 *
 * @param WP_Post|object|int $page Optional. Page ID or WP_Post object. Default is global $post.
 * @return string|false Page URI, false on error.
 */
function get_page_uri( $page = 0 ) {
	if ( ! $page instanceof WP_Post ) {
		$page = get_post( $page );
	}

	if ( ! $page )
		return false;

	$uri = $page->post_name;

	foreach ( $page->ancestors as $parent ) {
		$parent = get_post( $parent );
		if ( $parent && $parent->post_name ) {
			$uri = $parent->post_name . '/' . $uri;
		}
	}

	/**
	 * Filters the URI for a page.
	 *
	 * @since 4.4.0
	 *
	 * @param string  $uri  Page URI.
	 * @param WP_Post $page Page object.
	 */
	return apply_filters( 'get_page_uri', $uri, $page );
}

/**
 * Retrieve a list of pages (or hierarchical post type items).
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @since 1.5.0
 *
 * @param array|string $args {
 *     Optional. Array or string of arguments to retrieve pages.
 *
 *     @type int          $child_of     Page ID to return child and grandchild pages of. Note: The value
 *                                      of `$hierarchical` has no bearing on whether `$child_of` returns
 *                                      hierarchical results. Default 0, or no restriction.
 *     @type string       $sort_order   How to sort retrieved pages. Accepts 'ASC', 'DESC'. Default 'ASC'.
 *     @type string       $sort_column  What columns to sort pages by, comma-separated. Accepts 'post_author',
 *                                      'post_date', 'post_title', 'post_name', 'post_modified', 'menu_order',
 *                                      'post_modified_gmt', 'post_parent', 'ID', 'rand', 'comment_count'.
 *                                      'post_' can be omitted for any values that start with it.
 *                                      Default 'post_title'.
 *     @type bool         $hierarchical Whether to return pages hierarchically. If false in conjunction with
 *                                      `$child_of` also being false, both arguments will be disregarded.
 *                                      Default true.
 *     @type array        $exclude      Array of page IDs to exclude. Default empty array.
 *     @type array        $include      Array of page IDs to include. Cannot be used with `$child_of`,
 *                                      `$parent`, `$exclude`, `$meta_key`, `$meta_value`, or `$hierarchical`.
 *                                      Default empty array.
 *     @type string       $meta_key     Only include pages with this meta key. Default empty.
 *     @type string       $meta_value   Only include pages with this meta value. Requires `$meta_key`.
 *                                      Default empty.
 *     @type string       $authors      A comma-separated list of author IDs. Default empty.
 *     @type int          $parent       Page ID to return direct children of. Default -1, or no restriction.
 *     @type string|array $exclude_tree Comma-separated string or array of page IDs to exclude.
 *                                      Default empty array.
 *     @type int          $number       The number of pages to return. Default 0, or all pages.
 *     @type int          $offset       The number of pages to skip before returning. Requires `$number`.
 *                                      Default 0.
 *     @type string       $post_type    The post type to query. Default 'page'.
 *     @type string|array $post_status  A comma-separated list or array of post statuses to include.
 *                                      Default 'publish'.
 * }
 * @return array|false List of pages matching defaults or `$args`.
 */
function get_pages( $args = array() ) {
	global $wpdb;

	$defaults = array(
		'child_of'     => 0,
		'sort_order'   => 'ASC',
		'sort_column'  => 'post_title',
		'hierarchical' => 1,
		'exclude'      => array(),
		'include'      => array(),
		'meta_key'     => '',
		'meta_value'   => '',
		'authors'      => '',
		'parent'       => -1,
		'exclude_tree' => array(),
		'number'       => '',
		'offset'       => 0,
		'post_type'    => 'page',
		'post_status'  => 'publish',
	);

	$r = wp_parse_args( $args, $defaults );

	$number = (int) $r['number'];
	$offset = (int) $r['offset'];
	$child_of = (int) $r['child_of'];
	$hierarchical = $r['hierarchical'];
	$exclude = $r['exclude'];
	$meta_key = $r['meta_key'];
	$meta_value = $r['meta_value'];
	$parent = $r['parent'];
	$post_status = $r['post_status'];

	// Make sure the post type is hierarchical.
	$hierarchical_post_types = get_post_types( array( 'hierarchical' => true ) );
	if ( ! in_array( $r['post_type'], $hierarchical_post_types ) ) {
		return false;
	}

	if ( $parent > 0 && ! $child_of ) {
		$hierarchical = false;
	}

	// Make sure we have a valid post status.
	if ( ! is_array( $post_status ) ) {
		$post_status = explode( ',', $post_status );
	}
	if ( array_diff( $post_status, get_post_stati() ) ) {
		return false;
	}

	// $args can be whatever, only use the args defined in defaults to compute the key.
	$key = md5( serialize( wp_array_slice_assoc( $r, array_keys( $defaults ) ) ) );
	$last_changed = wp_cache_get_last_changed( 'posts' );

	$cache_key = "get_pages:$key:$last_changed";
	if ( $cache = wp_cache_get( $cache_key, 'posts' ) ) {
		// Convert to WP_Post instances.
		$pages = array_map( 'get_post', $cache );
		/** This filter is documented in wp-includes/post.php */
		$pages = apply_filters( 'get_pages', $pages, $r );
		return $pages;
	}

	$inclusions = '';
	if ( ! empty( $r['include'] ) ) {
		$child_of = 0; //ignore child_of, parent, exclude, meta_key, and meta_value params if using include
		$parent = -1;
		$exclude = '';
		$meta_key = '';
		$meta_value = '';
		$hierarchical = false;
		$incpages = wp_parse_id_list( $r['include'] );
		if ( ! empty( $incpages ) ) {
			$inclusions = ' AND ID IN (' . implode( ',', $incpages ) .  ')';
		}
	}

	$exclusions = '';
	if ( ! empty( $exclude ) ) {
		$expages = wp_parse_id_list( $exclude );
		if ( ! empty( $expages ) ) {
			$exclusions = ' AND ID NOT IN (' . implode( ',', $expages ) .  ')';
		}
	}

	$author_query = '';
	if ( ! empty( $r['authors'] ) ) {
		$post_authors = preg_split( '/[\s,]+/', $r['authors'] );

		if ( ! empty( $post_authors ) ) {
			foreach ( $post_authors as $post_author ) {
				//Do we have an author id or an author login?
				if ( 0 == intval($post_author) ) {
					$post_author = get_user_by('login', $post_author);
					if ( empty( $post_author ) ) {
						continue;
					}
					if ( empty( $post_author->ID ) ) {
						continue;
					}
					$post_author = $post_author->ID;
				}

				if ( '' == $author_query ) {
					$author_query = $wpdb->prepare(' post_author = %d ', $post_author);
				} else {
					$author_query .= $wpdb->prepare(' OR post_author = %d ', $post_author);
				}
			}
			if ( '' != $author_query ) {
				$author_query = " AND ($author_query)";
			}
		}
	}

	$join = '';
	$where = "$exclusions $inclusions ";
	if ( '' !== $meta_key || '' !== $meta_value ) {
		$join = " LEFT JOIN $wpdb->postmeta ON ( $wpdb->posts.ID = $wpdb->postmeta.post_id )";

		// meta_key and meta_value might be slashed
		$meta_key = wp_unslash($meta_key);
		$meta_value = wp_unslash($meta_value);
		if ( '' !== $meta_key ) {
			$where .= $wpdb->prepare(" AND $wpdb->postmeta.meta_key = %s", $meta_key);
		}
		if ( '' !== $meta_value ) {
			$where .= $wpdb->prepare(" AND $wpdb->postmeta.meta_value = %s", $meta_value);
		}

	}

	if ( is_array( $parent ) ) {
		$post_parent__in = implode( ',', array_map( 'absint', (array) $parent ) );
		if ( ! empty( $post_parent__in ) ) {
			$where .= " AND post_parent IN ($post_parent__in)";
		}
	} elseif ( $parent >= 0 ) {
		$where .= $wpdb->prepare(' AND post_parent = %d ', $parent);
	}

	if ( 1 == count( $post_status ) ) {
		$where_post_type = $wpdb->prepare( "post_type = %s AND post_status = %s", $r['post_type'], reset( $post_status ) );
	} else {
		$post_status = implode( "', '", $post_status );
		$where_post_type = $wpdb->prepare( "post_type = %s AND post_status IN ('$post_status')", $r['post_type'] );
	}

	$orderby_array = array();
	$allowed_keys = array( 'author', 'post_author', 'date', 'post_date', 'title', 'post_title', 'name', 'post_name', 'modified',
		'post_modified', 'modified_gmt', 'post_modified_gmt', 'menu_order', 'parent', 'post_parent',
		'ID', 'rand', 'comment_count' );

	foreach ( explode( ',', $r['sort_column'] ) as $orderby ) {
		$orderby = trim( $orderby );
		if ( ! in_array( $orderby, $allowed_keys ) ) {
			continue;
		}

		switch ( $orderby ) {
			case 'menu_order':
				break;
			case 'ID':
				$orderby = "$wpdb->posts.ID";
				break;
			case 'rand':
				$orderby = 'RAND()';
				break;
			case 'comment_count':
				$orderby = "$wpdb->posts.comment_count";
				break;
			default:
				if ( 0 === strpos( $orderby, 'post_' ) ) {
					$orderby = "$wpdb->posts." . $orderby;
				} else {
					$orderby = "$wpdb->posts.post_" . $orderby;
				}
		}

		$orderby_array[] = $orderby;

	}
	$sort_column = ! empty( $orderby_array ) ? implode( ',', $orderby_array ) : "$wpdb->posts.post_title";

	$sort_order = strtoupper( $r['sort_order'] );
	if ( '' !== $sort_order && ! in_array( $sort_order, array( 'ASC', 'DESC' ) ) ) {
		$sort_order = 'ASC';
	}

	$query = "SELECT * FROM $wpdb->posts $join WHERE ($where_post_type) $where ";
	$query .= $author_query;
	$query .= " ORDER BY " . $sort_column . " " . $sort_order ;

	if ( ! empty( $number ) ) {
		$query .= ' LIMIT ' . $offset . ',' . $number;
	}

	$pages = $wpdb->get_results($query);

	if ( empty($pages) ) {
		/** This filter is documented in wp-includes/post.php */
		$pages = apply_filters( 'get_pages', array(), $r );
		return $pages;
	}

	// Sanitize before caching so it'll only get done once.
	$num_pages = count($pages);
	for ($i = 0; $i < $num_pages; $i++) {
		$pages[$i] = sanitize_post($pages[$i], 'raw');
	}

	// Update cache.
	update_post_cache( $pages );

	if ( $child_of || $hierarchical ) {
		$pages = get_page_children($child_of, $pages);
	}

	if ( ! empty( $r['exclude_tree'] ) ) {
		$exclude = wp_parse_id_list( $r['exclude_tree'] );
		foreach ( $exclude as $id ) {
			$children = get_page_children( $id, $pages );
			foreach ( $children as $child ) {
				$exclude[] = $child->ID;
			}
		}

		$num_pages = count( $pages );
		for ( $i = 0; $i < $num_pages; $i++ ) {
			if ( in_array( $pages[$i]->ID, $exclude ) ) {
				unset( $pages[$i] );
			}
		}
	}

	$page_structure = array();
	foreach ( $pages as $page ) {
		$page_structure[] = $page->ID;
	}

	wp_cache_set( $cache_key, $page_structure, 'posts' );

	// Convert to WP_Post instances
	$pages = array_map( 'get_post', $pages );

	/**
	 * Filters the retrieved list of pages.
	 *
	 * @since 2.1.0
	 *
	 * @param array $pages List of pages to retrieve.
	 * @param array $r     Array of get_pages() arguments.
	 */
	return apply_filters( 'get_pages', $pages, $r );
}

//
// Attachment functions
//

/**
 * Determines whether an attachment URI is local and really an attachment.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 2.0.0
 *
 * @param string $url URL to check
 * @return bool True on success, false on failure.
 */
function is_local_attachment($url) {
	if (strpos($url, home_url()) === false)
		return false;
	if (strpos($url, home_url('/?attachment_id=')) !== false)
		return true;
	if ( $id = url_to_postid($url) ) {
		$post = get_post($id);
		if ( 'attachment' == $post->post_type )
			return true;
	}
	return false;
}

/**
 * Insert an attachment.
 *
 * If you set the 'ID' in the $args parameter, it will mean that you are
 * updating and attempt to update the attachment. You can also set the
 * attachment name or title by setting the key 'post_name' or 'post_title'.
 *
 * You can set the dates for the attachment manually by setting the 'post_date'
 * and 'post_date_gmt' keys' values.
 *
 * By default, the comments will use the default settings for whether the
 * comments are allowed. You can close them manually or keep them open by
 * setting the value for the 'comment_status' key.
 *
 * @since 2.0.0
 * @since 4.7.0 Added the `$wp_error` parameter to allow a WP_Error to be returned on failure.
 *
 * @see wp_insert_post()
 *
 * @param string|array $args     Arguments for inserting an attachment.
 * @param string       $file     Optional. Filename.
 * @param int          $parent   Optional. Parent post ID.
 * @param bool         $wp_error Optional. Whether to return a WP_Error on failure. Default false.
 * @return int|WP_Error The attachment ID on success. The value 0 or WP_Error on failure.
 */
function wp_insert_attachment( $args, $file = false, $parent = 0, $wp_error = false ) {
	$defaults = array(
		'file'        => $file,
		'post_parent' => 0
	);

	$data = wp_parse_args( $args, $defaults );

	if ( ! empty( $parent ) ) {
		$data['post_parent'] = $parent;
	}

	$data['post_type'] = 'attachment';

	return wp_insert_post( $data, $wp_error );
}

/**
 * Trash or delete an attachment.
 *
 * When an attachment is permanently deleted, the file will also be removed.
 * Deletion removes all post meta fields, taxonomy, comments, etc. associated
 * with the attachment (except the main post).
 *
 * The attachment is moved to the trash instead of permanently deleted unless trash
 * for media is disabled, item is already in the trash, or $force_delete is true.
 *
 * @since 2.0.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int  $post_id      Attachment ID.
 * @param bool $force_delete Optional. Whether to bypass trash and force deletion.
 *                           Default false.
 * @return WP_Post|false|null Post data on success, false or null on failure.
 */
function wp_delete_attachment( $post_id, $force_delete = false ) {
	global $wpdb;

	$post = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->posts WHERE ID = %d", $post_id ) );

	if ( ! $post ) {
		return $post;
	}

	$post = get_post( $post );

	if ( 'attachment' !== $post->post_type ) {
		return false;
	}

	if ( ! $force_delete && EMPTY_TRASH_DAYS && MEDIA_TRASH && 'trash' !== $post->post_status ) {
		return wp_trash_post( $post_id );
	}

	delete_post_meta($post_id, '_wp_trash_meta_status');
	delete_post_meta($post_id, '_wp_trash_meta_time');

	$meta = wp_get_attachment_metadata( $post_id );
	$backup_sizes = get_post_meta( $post->ID, '_wp_attachment_backup_sizes', true );
	$file = get_attached_file( $post_id );

	if ( is_multisite() )
		delete_transient( 'dirsize_cache' );

	/**
	 * Fires before an attachment is deleted, at the start of wp_delete_attachment().
	 *
	 * @since 2.0.0
	 *
	 * @param int $post_id Attachment ID.
	 */
	do_action( 'delete_attachment', $post_id );

	wp_delete_object_term_relationships($post_id, array('category', 'post_tag'));
	wp_delete_object_term_relationships($post_id, get_object_taxonomies($post->post_type));

	// Delete all for any posts.
	delete_metadata( 'post', null, '_thumbnail_id', $post_id, true );

	wp_defer_comment_counting( true );

	$comment_ids = $wpdb->get_col( $wpdb->prepare( "SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = %d", $post_id ));
	foreach ( $comment_ids as $comment_id ) {
		wp_delete_comment( $comment_id, true );
	}

	wp_defer_comment_counting( false );

	$post_meta_ids = $wpdb->get_col( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE post_id = %d ", $post_id ));
	foreach ( $post_meta_ids as $mid )
		delete_metadata_by_mid( 'post', $mid );

	/** This action is documented in wp-includes/post.php */
	do_action( 'delete_post', $post_id );
	$result = $wpdb->delete( $wpdb->posts, array( 'ID' => $post_id ) );
	if ( ! $result ) {
		return false;
	}
	/** This action is documented in wp-includes/post.php */
	do_action( 'deleted_post', $post_id );

	wp_delete_attachment_files( $post_id, $meta, $backup_sizes, $file );

	clean_post_cache( $post );

	return $post;
}

/**
 * Deletes all files that belong to the given attachment.
 *
 * @since 4.9.7
 *
 * @param int    $post_id      Attachment ID.
 * @param array  $meta         The attachment's meta data.
 * @param array  $backup_sizes The meta data for the attachment's backup images.
 * @param string $file         Absolute path to the attachment's file.
 * @return bool True on success, false on failure.
 */
function wp_delete_attachment_files( $post_id, $meta, $backup_sizes, $file ) {
	global $wpdb;

	$uploadpath = wp_get_upload_dir();
	$deleted    = true;

	if ( ! empty( $meta['thumb'] ) ) {
		// Don't delete the thumb if another attachment uses it.
		if ( ! $wpdb->get_row( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE meta_key = '_wp_attachment_metadata' AND meta_value LIKE %s AND post_id <> %d", '%' . $wpdb->esc_like( $meta['thumb'] ) . '%', $post_id ) ) ) {
			$thumbfile = str_replace( basename( $file ), $meta['thumb'], $file );
			if ( ! empty( $thumbfile ) ) {
				$thumbfile = path_join( $uploadpath['basedir'], $thumbfile );
				$thumbdir  = path_join( $uploadpath['basedir'], dirname( $file ) );

				if ( ! wp_delete_file_from_directory( $thumbfile, $thumbdir ) ) {
					$deleted = false;
				}
			}
		}
	}

	// Remove intermediate and backup images if there are any.
	if ( isset( $meta['sizes'] ) && is_array( $meta['sizes'] ) ) {
		$intermediate_dir = path_join( $uploadpath['basedir'], dirname( $file ) );
		foreach ( $meta['sizes'] as $size => $sizeinfo ) {
			$intermediate_file = str_replace( basename( $file ), $sizeinfo['file'], $file );
			if ( ! empty( $intermediate_file ) ) {
				$intermediate_file = path_join( $uploadpath['basedir'], $intermediate_file );

				if ( ! wp_delete_file_from_directory( $intermediate_file, $intermediate_dir ) ) {
					$deleted = false;
				}
			}
		}
	}

	if ( is_array( $backup_sizes ) ) {
		$del_dir = path_join( $uploadpath['basedir'], dirname( $meta['file'] ) );
		foreach ( $backup_sizes as $size ) {
			$del_file = path_join( dirname( $meta['file'] ), $size['file'] );
			if ( ! empty( $del_file ) ) {
				$del_file = path_join( $uploadpath['basedir'], $del_file );

				if ( ! wp_delete_file_from_directory( $del_file, $del_dir ) ) {
					$deleted = false;
				}
			}
		}
	}

	if ( ! wp_delete_file_from_directory( $file, $uploadpath['basedir'] ) ) {
		$deleted = false;
	}

	return $deleted;
}

/**
 * Retrieve attachment meta field for attachment ID.
 *
 * @since 2.1.0
 *
 * @param int  $attachment_id Attachment post ID. Defaults to global $post.
 * @param bool $unfiltered    Optional. If true, filters are not run. Default false.
 * @return mixed Attachment meta field. False on failure.
 */
function wp_get_attachment_metadata( $attachment_id = 0, $unfiltered = false ) {
	$attachment_id = (int) $attachment_id;
	if ( ! $post = get_post( $attachment_id ) ) {
		return false;
	}

	$data = get_post_meta( $post->ID, '_wp_attachment_metadata', true );

	if ( $unfiltered )
		return $data;

	/**
	 * Filters the attachment meta data.
	 *
	 * @since 2.1.0
	 *
	 * @param array|bool $data          Array of meta data for the given attachment, or false
	 *                                  if the object does not exist.
	 * @param int        $attachment_id Attachment post ID.
	 */
	return apply_filters( 'wp_get_attachment_metadata', $data, $post->ID );
}

/**
 * Update metadata for an attachment.
 *
 * @since 2.1.0
 *
 * @param int   $attachment_id Attachment post ID.
 * @param array $data          Attachment meta data.
 * @return int|bool False if $post is invalid.
 */
function wp_update_attachment_metadata( $attachment_id, $data ) {
	$attachment_id = (int) $attachment_id;
	if ( ! $post = get_post( $attachment_id ) ) {
		return false;
	}

	/**
	 * Filters the updated attachment meta data.
	 *
	 * @since 2.1.0
	 *
	 * @param array $data          Array of updated attachment meta data.
	 * @param int   $attachment_id Attachment post ID.
	 */
	if ( $data = apply_filters( 'wp_update_attachment_metadata', $data, $post->ID ) )
		return update_post_meta( $post->ID, '_wp_attachment_metadata', $data );
	else
		return delete_post_meta( $post->ID, '_wp_attachment_metadata' );
}

/**
 * Retrieve the URL for an attachment.
 *
 * @since 2.1.0
 *
 * @global string $pagenow
 *
 * @param int $attachment_id Optional. Attachment post ID. Defaults to global $post.
 * @return string|false Attachment URL, otherwise false.
 */
function wp_get_attachment_url( $attachment_id = 0 ) {
	$attachment_id = (int) $attachment_id;
	if ( ! $post = get_post( $attachment_id ) ) {
		return false;
	}

	if ( 'attachment' != $post->post_type )
		return false;

	$url = '';
	// Get attached file.
	if ( $file = get_post_meta( $post->ID, '_wp_attached_file', true ) ) {
		// Get upload directory.
		if ( ( $uploads = wp_get_upload_dir() ) && false === $uploads['error'] ) {
			// Check that the upload base exists in the file location.
			if ( 0 === strpos( $file, $uploads['basedir'] ) ) {
				// Replace file location with url location.
				$url = str_replace($uploads['basedir'], $uploads['baseurl'], $file);
			} elseif ( false !== strpos($file, 'wp-content/uploads') ) {
				// Get the directory name relative to the basedir (back compat for pre-2.7 uploads)
				$url = trailingslashit( $uploads['baseurl'] . '/' . _wp_get_attachment_relative_path( $file ) ) . basename( $file );
			} else {
				// It's a newly-uploaded file, therefore $file is relative to the basedir.
				$url = $uploads['baseurl'] . "/$file";
			}
		}
	}

	/*
	 * If any of the above options failed, Fallback on the GUID as used pre-2.7,
	 * not recommended to rely upon this.
	 */
	if ( empty($url) ) {
		$url = get_the_guid( $post->ID );
	}

	// On SSL front end, URLs should be HTTPS.
	if ( is_ssl() && ! is_admin() && 'wp-login.php' !== $GLOBALS['pagenow'] ) {
		$url = set_url_scheme( $url );
	}

	/**
	 * Filters the attachment URL.
	 *
	 * @since 2.1.0
	 *
	 * @param string $url           URL for the given attachment.
	 * @param int    $attachment_id Attachment post ID.
	 */
	$url = apply_filters( 'wp_get_attachment_url', $url, $post->ID );

	if ( empty( $url ) )
		return false;

	return $url;
}

/**
 * Retrieves the caption for an attachment.
 *
 * @since 4.6.0
 *
 * @param int $post_id Optional. Attachment ID. Default is the ID of the global `$post`.
 * @return string|false False on failure. Attachment caption on success.
 */
function wp_get_attachment_caption( $post_id = 0 ) {
	$post_id = (int) $post_id;
	if ( ! $post = get_post( $post_id ) ) {
		return false;
	}

	if ( 'attachment' !== $post->post_type ) {
		return false;
	}

	$caption = $post->post_excerpt;

	/**
	 * Filters the attachment caption.
	 *
	 * @since 4.6.0
	 *
	 * @param string $caption Caption for the given attachment.
	 * @param int    $post_id Attachment ID.
	 */
	return apply_filters( 'wp_get_attachment_caption', $caption, $post->ID );
}

/**
 * Retrieve thumbnail for an attachment.
 *
 * @since 2.1.0
 *
 * @param int $post_id Optional. Attachment ID. Default 0.
 * @return string|false False on failure. Thumbnail file path on success.
 */
function wp_get_attachment_thumb_file( $post_id = 0 ) {
	$post_id = (int) $post_id;
	if ( !$post = get_post( $post_id ) )
		return false;
	if ( !is_array( $imagedata = wp_get_attachment_metadata( $post->ID ) ) )
		return false;

	$file = get_attached_file( $post->ID );

	if ( !empty($imagedata['thumb']) && ($thumbfile = str_replace(basename($file), $imagedata['thumb'], $file)) && file_exists($thumbfile) ) {
		/**
		 * Filters the attachment thumbnail file path.
		 *
		 * @since 2.1.0
		 *
		 * @param string $thumbfile File path to the attachment thumbnail.
		 * @param int    $post_id   Attachment ID.
		 */
		return apply_filters( 'wp_get_attachment_thumb_file', $thumbfile, $post->ID );
	}
	return false;
}

/**
 * Retrieve URL for an attachment thumbnail.
 *
 * @since 2.1.0
 *
 * @param int $post_id Optional. Attachment ID. Default 0.
 * @return string|false False on failure. Thumbnail URL on success.
 */
function wp_get_attachment_thumb_url( $post_id = 0 ) {
	$post_id = (int) $post_id;
	if ( !$post = get_post( $post_id ) )
		return false;
	if ( !$url = wp_get_attachment_url( $post->ID ) )
		return false;

	$sized = image_downsize( $post_id, 'thumbnail' );
	if ( $sized )
		return $sized[0];

	if ( !$thumb = wp_get_attachment_thumb_file( $post->ID ) )
		return false;

	$url = str_replace(basename($url), basename($thumb), $url);

	/**
	 * Filters the attachment thumbnail URL.
	 *
	 * @since 2.1.0
	 *
	 * @param string $url     URL for the attachment thumbnail.
	 * @param int    $post_id Attachment ID.
	 */
	return apply_filters( 'wp_get_attachment_thumb_url', $url, $post->ID );
}

/**
 * Verifies an attachment is of a given type.
 *
 * @since 4.2.0
 *
 * @param string      $type Attachment type. Accepts 'image', 'audio', or 'video'.
 * @param int|WP_Post $post Optional. Attachment ID or object. Default is global $post.
 * @return bool True if one of the accepted types, false otherwise.
 */
function wp_attachment_is( $type, $post = null ) {
	if ( ! $post = get_post( $post ) ) {
		return false;
	}

	if ( ! $file = get_attached_file( $post->ID ) ) {
		return false;
	}

	if ( 0 === strpos( $post->post_mime_type, $type . '/' ) ) {
		return true;
	}

	$check = wp_check_filetype( $file );
	if ( empty( $check['ext'] ) ) {
		return false;
	}

	$ext = $check['ext'];

	if ( 'import' !== $post->post_mime_type ) {
		return $type === $ext;
	}

	switch ( $type ) {
	case 'image':
		$image_exts = array( 'jpg', 'jpeg', 'jpe', 'gif', 'png' );
		return in_array( $ext, $image_exts );

	case 'audio':
		return in_array( $ext, wp_get_audio_extensions() );

	case 'video':
		return in_array( $ext, wp_get_video_extensions() );

	default:
		return $type === $ext;
	}
}

/**
 * Determines whether an attachment is an image.
 *
 * For more information on this and similar theme functions, check out
 * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
 * Conditional Tags} article in the Theme Developer Handbook.
 *
 * @since 2.1.0
 * @since 4.2.0 Modified into wrapper for wp_attachment_is() and
 *              allowed WP_Post object to be passed.
 *
 * @param int|WP_Post $post Optional. Attachment ID or object. Default is global $post.
 * @return bool Whether the attachment is an image.
 */
function wp_attachment_is_image( $post = null ) {
	return wp_attachment_is( 'image', $post );
}

/**
 * Retrieve the icon for a MIME type.
 *
 * @since 2.1.0
 *
 * @param string|int $mime MIME type or attachment ID.
 * @return string|false Icon, false otherwise.
 */
function wp_mime_type_icon( $mime = 0 ) {
	if ( !is_numeric($mime) )
		$icon = wp_cache_get("mime_type_icon_$mime");

	$post_id = 0;
	if ( empty($icon) ) {
		$post_mimes = array();
		if ( is_numeric($mime) ) {
			$mime = (int) $mime;
			if ( $post = get_post( $mime ) ) {
				$post_id = (int) $post->ID;
				$file = get_attached_file( $post_id );
				$ext = preg_replace('/^.+?\.([^.]+)$/', '$1', $file);
				if ( !empty($ext) ) {
					$post_mimes[] = $ext;
					if ( $ext_type = wp_ext2type( $ext ) )
						$post_mimes[] = $ext_type;
				}
				$mime = $post->post_mime_type;
			} else {
				$mime = 0;
			}
		} else {
			$post_mimes[] = $mime;
		}

		$icon_files = wp_cache_get('icon_files');

		if ( !is_array($icon_files) ) {
			/**
			 * Filters the icon directory path.
			 *
			 * @since 2.0.0
			 *
			 * @param string $path Icon directory absolute path.
			 */
			$icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/media' );

			/**
			 * Filters the icon directory URI.
			 *
			 * @since 2.0.0
			 *
			 * @param string $uri Icon directory URI.
			 */
			$icon_dir_uri = apply_filters( 'icon_dir_uri', includes_url( 'images/media' ) );

			/**
			 * Filters the list of icon directory URIs.
			 *
			 * @since 2.5.0
			 *
			 * @param array $uris List of icon directory URIs.
			 */
			$dirs = apply_filters( 'icon_dirs', array( $icon_dir => $icon_dir_uri ) );
			$icon_files = array();
			while ( $dirs ) {
				$keys = array_keys( $dirs );
				$dir = array_shift( $keys );
				$uri = array_shift($dirs);
				if ( $dh = opendir($dir) ) {
					while ( false !== $file = readdir($dh) ) {
						$file = basename($file);
						if ( substr($file, 0, 1) == '.' )
							continue;
						if ( !in_array(strtolower(substr($file, -4)), array('.png', '.gif', '.jpg') ) ) {
							if ( is_dir("$dir/$file") )
								$dirs["$dir/$file"] = "$uri/$file";
							continue;
						}
						$icon_files["$dir/$file"] = "$uri/$file";
					}
					closedir($dh);
				}
			}
			wp_cache_add( 'icon_files', $icon_files, 'default', 600 );
		}

		$types = array();
		// Icon basename - extension = MIME wildcard.
		foreach ( $icon_files as $file => $uri )
			$types[ preg_replace('/^([^.]*).*$/', '$1', basename($file)) ] =& $icon_files[$file];

		if ( ! empty($mime) ) {
			$post_mimes[] = substr($mime, 0, strpos($mime, '/'));
			$post_mimes[] = substr($mime, strpos($mime, '/') + 1);
			$post_mimes[] = str_replace('/', '_', $mime);
		}

		$matches = wp_match_mime_types(array_keys($types), $post_mimes);
		$matches['default'] = array('default');

		foreach ( $matches as $match => $wilds ) {
			foreach ( $wilds as $wild ) {
				if ( ! isset( $types[ $wild ] ) ) {
					continue;
				}

				$icon = $types[ $wild ];
				if ( ! is_numeric( $mime ) ) {
					wp_cache_add( "mime_type_icon_$mime", $icon );
				}
				break 2;
			}
		}
	}

	/**
	 * Filters the mime type icon.
	 *
	 * @since 2.1.0
	 *
	 * @param string $icon    Path to the mime type icon.
	 * @param string $mime    Mime type.
	 * @param int    $post_id Attachment ID. Will equal 0 if the function passed
	 *                        the mime type.
	 */
	return apply_filters( 'wp_mime_type_icon', $icon, $mime, $post_id );
}

/**
 * Check for changed slugs for published post objects and save the old slug.
 *
 * The function is used when a post object of any type is updated,
 * by comparing the current and previous post objects.
 *
 * If the slug was changed and not already part of the old slugs then it will be
 * added to the post meta field ('_wp_old_slug') for storing old slugs for that
 * post.
 *
 * The most logically usage of this function is redirecting changed post objects, so
 * that those that linked to an changed post will be redirected to the new post.
 *
 * @since 2.1.0
 *
 * @param int     $post_id     Post ID.
 * @param WP_Post $post        The Post Object
 * @param WP_Post $post_before The Previous Post Object
 */
function wp_check_for_changed_slugs( $post_id, $post, $post_before ) {
	// Don't bother if it hasn't changed.
	if ( $post->post_name == $post_before->post_name ) {
		return;
	}

	// We're only concerned with published, non-hierarchical objects.
	if ( ! ( 'publish' === $post->post_status || ( 'attachment' === get_post_type( $post ) && 'inherit' === $post->post_status ) ) || is_post_type_hierarchical( $post->post_type ) ) {
		return;
	}

	$old_slugs = (array) get_post_meta( $post_id, '_wp_old_slug' );

	// If we haven't added this old slug before, add it now.
	if ( ! empty( $post_before->post_name ) && ! in_array( $post_before->post_name, $old_slugs ) ) {
		add_post_meta( $post_id, '_wp_old_slug', $post_before->post_name );
	}

	// If the new slug was used previously, delete it from the list.
	if ( in_array( $post->post_name, $old_slugs ) ) {
		delete_post_meta( $post_id, '_wp_old_slug', $post->post_name );
	}
}

/**
 * Check for changed dates for published post objects and save the old date.
 *
 * The function is used when a post object of any type is updated,
 * by comparing the current and previous post objects.
 *
 * If the date was changed and not already part of the old dates then it will be
 * added to the post meta field ('_wp_old_date') for storing old dates for that
 * post.
 *
 * The most logically usage of this function is redirecting changed post objects, so
 * that those that linked to an changed post will be redirected to the new post.
 *
 * @since 4.9.3
 *
 * @param int     $post_id     Post ID.
 * @param WP_Post $post        The Post Object
 * @param WP_Post $post_before The Previous Post Object
 */
function wp_check_for_changed_dates( $post_id, $post, $post_before ) {
	$previous_date = date( 'Y-m-d', strtotime( $post_before->post_date ) );
	$new_date = date( 'Y-m-d', strtotime( $post->post_date ) );
	// Don't bother if it hasn't changed.
	if ( $new_date == $previous_date ) {
		return;
	}
	// We're only concerned with published, non-hierarchical objects.
	if ( ! ( 'publish' === $post->post_status || ( 'attachment' === get_post_type( $post ) && 'inherit' === $post->post_status ) ) || is_post_type_hierarchical( $post->post_type ) ) {
		return;
	}
	$old_dates = (array) get_post_meta( $post_id, '_wp_old_date' );
	// If we haven't added this old date before, add it now.
	if ( ! empty( $previous_date ) && ! in_array( $previous_date, $old_dates ) ) {
		add_post_meta( $post_id, '_wp_old_date', $previous_date );
	}
	// If the new slug was used previously, delete it from the list.
	if ( in_array( $new_date, $old_dates ) ) {
		delete_post_meta( $post_id, '_wp_old_date', $new_date );
	}
}

/**
 * Retrieve the private post SQL based on capability.
 *
 * This function provides a standardized way to appropriately select on the
 * post_status of a post type. The function will return a piece of SQL code
 * that can be added to a WHERE clause; this SQL is constructed to allow all
 * published posts, and all private posts to which the user has access.
 *
 * @since 2.2.0
 * @since 4.3.0 Added the ability to pass an array to `$post_type`.
 *
 * @param string|array $post_type Single post type or an array of post types. Currently only supports 'post' or 'page'.
 * @return string SQL code that can be added to a where clause.
 */
function get_private_posts_cap_sql( $post_type ) {
	return get_posts_by_author_sql( $post_type, false );
}

/**
 * Retrieve the post SQL based on capability, author, and type.
 *
 * @since 3.0.0
 * @since 4.3.0 Introduced the ability to pass an array of post types to `$post_type`.
 *
 * @see get_private_posts_cap_sql()
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param array|string   $post_type   Single post type or an array of post types.
 * @param bool           $full        Optional. Returns a full WHERE statement instead of just
 *                                    an 'andalso' term. Default true.
 * @param int            $post_author Optional. Query posts having a single author ID. Default null.
 * @param bool           $public_only Optional. Only return public posts. Skips cap checks for
 *                                    $current_user.  Default false.
 * @return string SQL WHERE code that can be added to a query.
 */
function get_posts_by_author_sql( $post_type, $full = true, $post_author = null, $public_only = false ) {
	global $wpdb;

	if ( is_array( $post_type ) ) {
		$post_types = $post_type;
	} else {
		$post_types = array( $post_type );
	}

	$post_type_clauses = array();
	foreach ( $post_types as $post_type ) {
		$post_type_obj = get_post_type_object( $post_type );
		if ( ! $post_type_obj ) {
			continue;
		}

		/**
		 * Filters the capability to read private posts for a custom post type
		 * when generating SQL for getting posts by author.
		 *
		 * @since 2.2.0
		 * @deprecated 3.2.0 The hook transitioned from "somewhat useless" to "totally useless".
		 *
		 * @param string $cap Capability.
		 */
		if ( ! $cap = apply_filters( 'pub_priv_sql_capability', '' ) ) {
			$cap = current_user_can( $post_type_obj->cap->read_private_posts );
		}

		// Only need to check the cap if $public_only is false.
		$post_status_sql = "post_status = 'publish'";
		if ( false === $public_only ) {
			if ( $cap ) {
				// Does the user have the capability to view private posts? Guess so.
				$post_status_sql .= " OR post_status = 'private'";
			} elseif ( is_user_logged_in() ) {
				// Users can view their own private posts.
				$id = get_current_user_id();
				if ( null === $post_author || ! $full ) {
					$post_status_sql .= " OR post_status = 'private' AND post_author = $id";
				} elseif ( $id == (int) $post_author ) {
					$post_status_sql .= " OR post_status = 'private'";
				} // else none
			} // else none
		}

		$post_type_clauses[] = "( post_type = '" . $post_type . "' AND ( $post_status_sql ) )";
	}

	if ( empty( $post_type_clauses ) ) {
		return $full ? 'WHERE 1 = 0' : '1 = 0';
	}

	$sql = '( '. implode( ' OR ', $post_type_clauses ) . ' )';

	if ( null !== $post_author ) {
		$sql .= $wpdb->prepare( ' AND post_author = %d', $post_author );
	}

	if ( $full ) {
		$sql = 'WHERE ' . $sql;
	}

	return $sql;
}

/**
 * Retrieve the date that the last post was published.
 *
 * The server timezone is the default and is the difference between GMT and
 * server time. The 'blog' value is the date when the last post was posted. The
 * 'gmt' is when the last post was posted in GMT formatted date.
 *
 * @since 0.71
 * @since 4.4.0 The `$post_type` argument was added.
 *
 * @param string $timezone  Optional. The timezone for the timestamp. Accepts 'server', 'blog', or 'gmt'.
 *                          'server' uses the server's internal timezone.
 *                          'blog' uses the `post_modified` field, which proxies to the timezone set for the site.
 *                          'gmt' uses the `post_modified_gmt` field.
 *                          Default 'server'.
 * @param string $post_type Optional. The post type to check. Default 'any'.
 * @return string The date of the last post.
 */
function get_lastpostdate( $timezone = 'server', $post_type = 'any' ) {
	/**
	 * Filters the date the last post was published.
	 *
	 * @since 2.3.0
	 *
	 * @param string $date     Date the last post was published.
	 * @param string $timezone Location to use for getting the post published date.
	 *                         See get_lastpostdate() for accepted `$timezone` values.
	 */
	return apply_filters( 'get_lastpostdate', _get_last_post_time( $timezone, 'date', $post_type ), $timezone );
}

/**
 * Get the timestamp of the last time any post was modified.
 *
 * The server timezone is the default and is the difference between GMT and
 * server time. The 'blog' value is just when the last post was modified. The
 * 'gmt' is when the last post was modified in GMT time.
 *
 * @since 1.2.0
 * @since 4.4.0 The `$post_type` argument was added.
 *
 * @param string $timezone  Optional. The timezone for the timestamp. See get_lastpostdate()
 *                          for information on accepted values.
 *                          Default 'server'.
 * @param string $post_type Optional. The post type to check. Default 'any'.
 * @return string The timestamp.
 */
function get_lastpostmodified( $timezone = 'server', $post_type = 'any' ) {
	/**
	 * Pre-filter the return value of get_lastpostmodified() before the query is run.
	 *
	 * @since 4.4.0
	 *
	 * @param string $lastpostmodified Date the last post was modified.
	 *                                 Returning anything other than false will short-circuit the function.
	 * @param string $timezone         Location to use for getting the post modified date.
	 *                                 See get_lastpostdate() for accepted `$timezone` values.
	 * @param string $post_type        The post type to check.
	 */
	$lastpostmodified = apply_filters( 'pre_get_lastpostmodified', false, $timezone, $post_type );
	if ( false !== $lastpostmodified ) {
		return $lastpostmodified;
	}

	$lastpostmodified = _get_last_post_time( $timezone, 'modified', $post_type );

	$lastpostdate = get_lastpostdate($timezone);
	if ( $lastpostdate > $lastpostmodified ) {
		$lastpostmodified = $lastpostdate;
	}

	/**
	 * Filters the date the last post was modified.
	 *
	 * @since 2.3.0
	 *
	 * @param string $lastpostmodified Date the last post was modified.
	 * @param string $timezone         Location to use for getting the post modified date.
	 *                                 See get_lastpostdate() for accepted `$timezone` values.
	 */
	return apply_filters( 'get_lastpostmodified', $lastpostmodified, $timezone );
}

/**
 * Get the timestamp of the last time any post was modified or published.
 *
 * @since 3.1.0
 * @since 4.4.0 The `$post_type` argument was added.
 * @access private
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $timezone  The timezone for the timestamp. See get_lastpostdate().
 *                          for information on accepted values.
 * @param string $field     Post field to check. Accepts 'date' or 'modified'.
 * @param string $post_type Optional. The post type to check. Default 'any'.
 * @return string|false The timestamp.
 */
function _get_last_post_time( $timezone, $field, $post_type = 'any' ) {
	global $wpdb;

	if ( ! in_array( $field, array( 'date', 'modified' ) ) ) {
		return false;
	}

	$timezone = strtolower( $timezone );

	$key = "lastpost{$field}:$timezone";
	if ( 'any' !== $post_type ) {
		$key .= ':' . sanitize_key( $post_type );
	}

	$date = wp_cache_get( $key, 'timeinfo' );
	if ( false !== $date ) {
		return $date;
	}

	if ( 'any' === $post_type ) {
		$post_types = get_post_types( array( 'public' => true ) );
		array_walk( $post_types, array( $wpdb, 'escape_by_ref' ) );
		$post_types = "'" . implode( "', '", $post_types ) . "'";
	} else {
		$post_types = "'" . sanitize_key( $post_type ) . "'";
	}

	switch ( $timezone ) {
		case 'gmt':
			$date = $wpdb->get_var("SELECT post_{$field}_gmt FROM $wpdb->posts WHERE post_status = 'publish' AND post_type IN ({$post_types}) ORDER BY post_{$field}_gmt DESC LIMIT 1");
			break;
		case 'blog':
			$date = $wpdb->get_var("SELECT post_{$field} FROM $wpdb->posts WHERE post_status = 'publish' AND post_type IN ({$post_types}) ORDER BY post_{$field}_gmt DESC LIMIT 1");
			break;
		case 'server':
			$add_seconds_server = date( 'Z' );
			$date = $wpdb->get_var("SELECT DATE_ADD(post_{$field}_gmt, INTERVAL '$add_seconds_server' SECOND) FROM $wpdb->posts WHERE post_status = 'publish' AND post_type IN ({$post_types}) ORDER BY post_{$field}_gmt DESC LIMIT 1");
			break;
	}

	if ( $date ) {
		wp_cache_set( $key, $date, 'timeinfo' );

		return $date;
	}

	return false;
}

/**
 * Updates posts in cache.
 *
 * @since 1.5.1
 *
 * @param array $posts Array of post objects (passed by reference).
 */
function update_post_cache( &$posts ) {
	if ( ! $posts )
		return;

	foreach ( $posts as $post )
		wp_cache_add( $post->ID, $post, 'posts' );
}

/**
 * Will clean the post in the cache.
 *
 * Cleaning means delete from the cache of the post. Will call to clean the term
 * object cache associated with the post ID.
 *
 * This function not run if $_wp_suspend_cache_invalidation is not empty. See
 * wp_suspend_cache_invalidation().
 *
 * @since 2.0.0
 *
 * @global bool $_wp_suspend_cache_invalidation
 *
 * @param int|WP_Post $post Post ID or post object to remove from the cache.
 */
function clean_post_cache( $post ) {
	global $_wp_suspend_cache_invalidation;

	if ( ! empty( $_wp_suspend_cache_invalidation ) )
		return;

	$post = get_post( $post );
	if ( empty( $post ) )
		return;

	wp_cache_delete( $post->ID, 'posts' );
	wp_cache_delete( $post->ID, 'post_meta' );

	clean_object_term_cache( $post->ID, $post->post_type );

	wp_cache_delete( 'wp_get_archives', 'general' );

	/**
	 * Fires immediately after the given post's cache is cleaned.
	 *
	 * @since 2.5.0
	 *
	 * @param int     $post_id Post ID.
	 * @param WP_Post $post    Post object.
	 */
	do_action( 'clean_post_cache', $post->ID, $post );

	if ( 'page' == $post->post_type ) {
		wp_cache_delete( 'all_page_ids', 'posts' );

		/**
		 * Fires immediately after the given page's cache is cleaned.
		 *
		 * @since 2.5.0
		 *
		 * @param int $post_id Post ID.
		 */
		do_action( 'clean_page_cache', $post->ID );
	}

	wp_cache_set( 'last_changed', microtime(), 'posts' );
}

/**
 * Call major cache updating functions for list of Post objects.
 *
 * @since 1.5.0
 *
 * @param array  $posts             Array of Post objects
 * @param string $post_type         Optional. Post type. Default 'post'.
 * @param bool   $update_term_cache Optional. Whether to update the term cache. Default true.
 * @param bool   $update_meta_cache Optional. Whether to update the meta cache. Default true.
 */
function update_post_caches( &$posts, $post_type = 'post', $update_term_cache = true, $update_meta_cache = true ) {
	// No point in doing all this work if we didn't match any posts.
	if ( !$posts )
		return;

	update_post_cache($posts);

	$post_ids = array();
	foreach ( $posts as $post )
		$post_ids[] = $post->ID;

	if ( ! $post_type )
		$post_type = 'any';

	if ( $update_term_cache ) {
		if ( is_array($post_type) ) {
			$ptypes = $post_type;
		} elseif ( 'any' == $post_type ) {
			$ptypes = array();
			// Just use the post_types in the supplied posts.
			foreach ( $posts as $post ) {
				$ptypes[] = $post->post_type;
			}
			$ptypes = array_unique($ptypes);
		} else {
			$ptypes = array($post_type);
		}

		if ( ! empty($ptypes) )
			update_object_term_cache($post_ids, $ptypes);
	}

	if ( $update_meta_cache )
		update_postmeta_cache($post_ids);
}

/**
 * Updates metadata cache for list of post IDs.
 *
 * Performs SQL query to retrieve the metadata for the post IDs and updates the
 * metadata cache for the posts. Therefore, the functions, which call this
 * function, do not need to perform SQL queries on their own.
 *
 * @since 2.1.0
 *
 * @param array $post_ids List of post IDs.
 * @return array|false Returns false if there is nothing to update or an array
 *                     of metadata.
 */
function update_postmeta_cache( $post_ids ) {
	return update_meta_cache('post', $post_ids);
}

/**
 * Will clean the attachment in the cache.
 *
 * Cleaning means delete from the cache. Optionally will clean the term
 * object cache associated with the attachment ID.
 *
 * This function will not run if $_wp_suspend_cache_invalidation is not empty.
 *
 * @since 3.0.0
 *
 * @global bool $_wp_suspend_cache_invalidation
 *
 * @param int  $id          The attachment ID in the cache to clean.
 * @param bool $clean_terms Optional. Whether to clean terms cache. Default false.
 */
function clean_attachment_cache( $id, $clean_terms = false ) {
	global $_wp_suspend_cache_invalidation;

	if ( !empty($_wp_suspend_cache_invalidation) )
		return;

	$id = (int) $id;

	wp_cache_delete($id, 'posts');
	wp_cache_delete($id, 'post_meta');

	if ( $clean_terms )
		clean_object_term_cache($id, 'attachment');

	/**
	 * Fires after the given attachment's cache is cleaned.
	 *
	 * @since 3.0.0
	 *
	 * @param int $id Attachment ID.
	 */
	do_action( 'clean_attachment_cache', $id );
}

//
// Hooks
//

/**
 * Hook for managing future post transitions to published.
 *
 * @since 2.3.0
 * @access private
 *
 * @see wp_clear_scheduled_hook()
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string  $new_status New post status.
 * @param string  $old_status Previous post status.
 * @param WP_Post $post       Post object.
 */
function _transition_post_status( $new_status, $old_status, $post ) {
	global $wpdb;

	if ( $old_status != 'publish' && $new_status == 'publish' ) {
		// Reset GUID if transitioning to publish and it is empty.
		if ( '' == get_the_guid($post->ID) )
			$wpdb->update( $wpdb->posts, array( 'guid' => get_permalink( $post->ID ) ), array( 'ID' => $post->ID ) );

		/**
		 * Fires when a post's status is transitioned from private to published.
		 *
		 * @since 1.5.0
		 * @deprecated 2.3.0 Use 'private_to_publish' instead.
		 *
		 * @param int $post_id Post ID.
		 */
		do_action('private_to_published', $post->ID);
	}

	// If published posts changed clear the lastpostmodified cache.
	if ( 'publish' == $new_status || 'publish' == $old_status) {
		foreach ( array( 'server', 'gmt', 'blog' ) as $timezone ) {
			wp_cache_delete( "lastpostmodified:$timezone", 'timeinfo' );
			wp_cache_delete( "lastpostdate:$timezone", 'timeinfo' );
			wp_cache_delete( "lastpostdate:$timezone:{$post->post_type}", 'timeinfo' );
		}
	}

	if ( $new_status !== $old_status ) {
		wp_cache_delete( _count_posts_cache_key( $post->post_type ), 'counts' );
		wp_cache_delete( _count_posts_cache_key( $post->post_type, 'readable' ), 'counts' );
	}

	// Always clears the hook in case the post status bounced from future to draft.
	wp_clear_scheduled_hook('publish_future_post', array( $post->ID ) );
}

/**
 * Hook used to schedule publication for a post marked for the future.
 *
 * The $post properties used and must exist are 'ID' and 'post_date_gmt'.
 *
 * @since 2.3.0
 * @access private
 *
 * @param int     $deprecated Not used. Can be set to null. Never implemented. Not marked
 *                            as deprecated with _deprecated_argument() as it conflicts with
 *                            wp_transition_post_status() and the default filter for _future_post_hook().
 * @param WP_Post $post       Post object.
 */
function _future_post_hook( $deprecated, $post ) {
	wp_clear_scheduled_hook( 'publish_future_post', array( $post->ID ) );
	wp_schedule_single_event( strtotime( get_gmt_from_date( $post->post_date ) . ' GMT') , 'publish_future_post', array( $post->ID ) );
}

/**
 * Hook to schedule pings and enclosures when a post is published.
 *
 * Uses XMLRPC_REQUEST and WP_IMPORTING constants.
 *
 * @since 2.3.0
 * @access private
 *
 * @param int $post_id The ID in the database table of the post being published.
 */
function _publish_post_hook( $post_id ) {
	if ( defined( 'XMLRPC_REQUEST' ) ) {
		/**
		 * Fires when _publish_post_hook() is called during an XML-RPC request.
		 *
		 * @since 2.1.0
		 *
		 * @param int $post_id Post ID.
		 */
		do_action( 'xmlrpc_publish_post', $post_id );
	}

	if ( defined('WP_IMPORTING') )
		return;

	if ( get_option('default_pingback_flag') )
		add_post_meta( $post_id, '_pingme', '1' );
	add_post_meta( $post_id, '_encloseme', '1' );

	if ( ! wp_next_scheduled( 'do_pings' ) ) {
		wp_schedule_single_event( time(), 'do_pings' );
	}
}

/**
 * Return the post's parent's post_ID
 *
 * @since 3.1.0
 *
 * @param int $post_ID
 *
 * @return int|false Post parent ID, otherwise false.
 */
function wp_get_post_parent_id( $post_ID ) {
	$post = get_post( $post_ID );
	if ( !$post || is_wp_error( $post ) )
		return false;
	return (int) $post->post_parent;
}

/**
 * Check the given subset of the post hierarchy for hierarchy loops.
 *
 * Prevents loops from forming and breaks those that it finds. Attached
 * to the {@see 'wp_insert_post_parent'} filter.
 *
 * @since 3.1.0
 *
 * @see wp_find_hierarchy_loop()
 *
 * @param int $post_parent ID of the parent for the post we're checking.
 * @param int $post_ID     ID of the post we're checking.
 * @return int The new post_parent for the post, 0 otherwise.
 */
function wp_check_post_hierarchy_for_loops( $post_parent, $post_ID ) {
	// Nothing fancy here - bail.
	if ( !$post_parent )
		return 0;

	// New post can't cause a loop.
	if ( empty( $post_ID ) )
		return $post_parent;

	// Can't be its own parent.
	if ( $post_parent == $post_ID )
		return 0;

	// Now look for larger loops.
	if ( !$loop = wp_find_hierarchy_loop( 'wp_get_post_parent_id', $post_ID, $post_parent ) )
		return $post_parent; // No loop

	// Setting $post_parent to the given value causes a loop.
	if ( isset( $loop[$post_ID] ) )
		return 0;

	// There's a loop, but it doesn't contain $post_ID. Break the loop.
	foreach ( array_keys( $loop ) as $loop_member )
		wp_update_post( array( 'ID' => $loop_member, 'post_parent' => 0 ) );

	return $post_parent;
}

/**
 * Set a post thumbnail.
 *
 * @since 3.1.0
 *
 * @param int|WP_Post $post         Post ID or post object where thumbnail should be attached.
 * @param int         $thumbnail_id Thumbnail to attach.
 * @return int|bool True on success, false on failure.
 */
function set_post_thumbnail( $post, $thumbnail_id ) {
	$post = get_post( $post );
	$thumbnail_id = absint( $thumbnail_id );
	if ( $post && $thumbnail_id && get_post( $thumbnail_id ) ) {
		if ( wp_get_attachment_image( $thumbnail_id, 'thumbnail' ) )
			return update_post_meta( $post->ID, '_thumbnail_id', $thumbnail_id );
		else
			return delete_post_meta( $post->ID, '_thumbnail_id' );
	}
	return false;
}

/**
 * Remove a post thumbnail.
 *
 * @since 3.3.0
 *
 * @param int|WP_Post $post Post ID or post object where thumbnail should be removed from.
 * @return bool True on success, false on failure.
 */
function delete_post_thumbnail( $post ) {
	$post = get_post( $post );
	if ( $post )
		return delete_post_meta( $post->ID, '_thumbnail_id' );
	return false;
}

/**
 * Delete auto-drafts for new posts that are > 7 days old.
 *
 * @since 3.4.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 */
function wp_delete_auto_drafts() {
	global $wpdb;

	// Cleanup old auto-drafts more than 7 days old.
	$old_posts = $wpdb->get_col( "SELECT ID FROM $wpdb->posts WHERE post_status = 'auto-draft' AND DATE_SUB( NOW(), INTERVAL 7 DAY ) > post_date" );
	foreach ( (array) $old_posts as $delete ) {
		// Force delete.
		wp_delete_post( $delete, true );
	}
}

/**
 * Queues posts for lazy-loading of term meta.
 *
 * @since 4.5.0
 *
 * @param array $posts Array of WP_Post objects.
 */
function wp_queue_posts_for_term_meta_lazyload( $posts ) {
	$post_type_taxonomies = $term_ids = array();
	foreach ( $posts as $post ) {
		if ( ! ( $post instanceof WP_Post ) ) {
			continue;
		}

		if ( ! isset( $post_type_taxonomies[ $post->post_type ] ) ) {
			$post_type_taxonomies[ $post->post_type ] = get_object_taxonomies( $post->post_type );
		}

		foreach ( $post_type_taxonomies[ $post->post_type ] as $taxonomy ) {
			// Term cache should already be primed by `update_post_term_cache()`.
			$terms = get_object_term_cache( $post->ID, $taxonomy );
			if ( false !== $terms ) {
				foreach ( $terms as $term ) {
					if ( ! isset( $term_ids[ $term->term_id ] ) ) {
						$term_ids[] = $term->term_id;
					}
				}
			}
		}
	}

	if ( $term_ids ) {
		$lazyloader = wp_metadata_lazyloader();
		$lazyloader->queue_objects( 'term', $term_ids );
	}
}

/**
 * Update the custom taxonomies' term counts when a post's status is changed.
 *
 * For example, default posts term counts (for custom taxonomies) don't include
 * private / draft posts.
 *
 * @since 3.3.0
 * @access private
 *
 * @param string  $new_status New post status.
 * @param string  $old_status Old post status.
 * @param WP_Post $post       Post object.
 */
function _update_term_count_on_transition_post_status( $new_status, $old_status, $post ) {
	// Update counts for the post's terms.
	foreach ( (array) get_object_taxonomies( $post->post_type ) as $taxonomy ) {
		$tt_ids = wp_get_object_terms( $post->ID, $taxonomy, array( 'fields' => 'tt_ids' ) );
		wp_update_term_count( $tt_ids, $taxonomy );
	}
}

/**
 * Adds any posts from the given ids to the cache that do not already exist in cache
 *
 * @since 3.4.0
 * @access private
 *
 * @see update_post_caches()
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param array $ids               ID list.
 * @param bool  $update_term_cache Optional. Whether to update the term cache. Default true.
 * @param bool  $update_meta_cache Optional. Whether to update the meta cache. Default true.
 */
function _prime_post_caches( $ids, $update_term_cache = true, $update_meta_cache = true ) {
	global $wpdb;

	$non_cached_ids = _get_non_cached_ids( $ids, 'posts' );
	if ( !empty( $non_cached_ids ) ) {
		$fresh_posts = $wpdb->get_results( sprintf( "SELECT $wpdb->posts.* FROM $wpdb->posts WHERE ID IN (%s)", join( ",", $non_cached_ids ) ) );

		update_post_caches( $fresh_posts, 'any', $update_term_cache, $update_meta_cache );
	}
}

/**
 * Adds a suffix if any trashed posts have a given slug.
 *
 * Store its desired (i.e. current) slug so it can try to reclaim it
 * if the post is untrashed.
 *
 * For internal use.
 *
 * @since 4.5.0
 * @access private
 *
 * @param string $post_name Slug.
 * @param string $post_ID   Optional. Post ID that should be ignored. Default 0.
 */
function wp_add_trashed_suffix_to_post_name_for_trashed_posts( $post_name, $post_ID = 0 ) {
	$trashed_posts_with_desired_slug = get_posts( array(
		'name' => $post_name,
		'post_status' => 'trash',
		'post_type' => 'any',
		'nopaging' => true,
		'post__not_in' => array( $post_ID )
	) );

	if ( ! empty( $trashed_posts_with_desired_slug ) ) {
		foreach ( $trashed_posts_with_desired_slug as $_post ) {
			wp_add_trashed_suffix_to_post_name_for_post( $_post );
		}
	}
}

/**
 * Adds a trashed suffix for a given post.
 *
 * Store its desired (i.e. current) slug so it can try to reclaim it
 * if the post is untrashed.
 *
 * For internal use.
 *
 * @since 4.5.0
 * @access private
 *
 * @param WP_Post $post The post.
 * @return string New slug for the post.
 */
function wp_add_trashed_suffix_to_post_name_for_post( $post ) {
	global $wpdb;

	$post = get_post( $post );

	if ( '__trashed' === substr( $post->post_name, -9 ) ) {
		return $post->post_name;
	}
	add_post_meta( $post->ID, '_wp_desired_post_slug', $post->post_name );
	$post_name = _truncate_post_slug( $post->post_name, 191 ) . '__trashed';
	$wpdb->update( $wpdb->posts, array( 'post_name' => $post_name ), array( 'ID' => $post->ID ) );
	clean_post_cache( $post->ID );
	return $post_name;
}

/**
 * Sets the last changed time for the 'posts' cache group.
 *
 * @since 5.0.0
 */
function wp_cache_set_posts_last_changed() {
	wp_cache_set( 'last_changed', microtime(), 'posts' );
}
home/xbodynamge/crosstraining/wp-admin/post.php000064400000021574151132150210015730 0ustar00<?php
/**
 * Edit post administration panel.
 *
 * Manage Post actions: post, edit, delete, etc.
 *
 * @package WordPress
 * @subpackage Administration
 */

/** WordPress Administration Bootstrap */
require_once( dirname( __FILE__ ) . '/admin.php' );

$parent_file = 'edit.php';
$submenu_file = 'edit.php';

wp_reset_vars( array( 'action' ) );

if ( isset( $_GET['post'] ) && isset( $_POST['post_ID'] ) && (int) $_GET['post'] !== (int) $_POST['post_ID'] )
	wp_die( __( 'A post ID mismatch has been detected.' ), __( 'Sorry, you are not allowed to edit this item.' ), 400 );
elseif ( isset( $_GET['post'] ) )
 	$post_id = $post_ID = (int) $_GET['post'];
elseif ( isset( $_POST['post_ID'] ) )
 	$post_id = $post_ID = (int) $_POST['post_ID'];
else
 	$post_id = $post_ID = 0;

/**
 * @global string  $post_type
 * @global object  $post_type_object
 * @global WP_Post $post
 */
global $post_type, $post_type_object, $post;

if ( $post_id )
	$post = get_post( $post_id );

if ( $post ) {
	$post_type = $post->post_type;
	$post_type_object = get_post_type_object( $post_type );
}

if ( isset( $_POST['post_type'] ) && $post && $post_type !== $_POST['post_type'] ) {
	wp_die( __( 'A post type mismatch has been detected.' ), __( 'Sorry, you are not allowed to edit this item.' ), 400 );
}

if ( isset( $_POST['deletepost'] ) )
	$action = 'delete';
elseif ( isset($_POST['wp-preview']) && 'dopreview' == $_POST['wp-preview'] )
	$action = 'preview';

$sendback = wp_get_referer();
if ( ! $sendback ||
     strpos( $sendback, 'post.php' ) !== false ||
     strpos( $sendback, 'post-new.php' ) !== false ) {
	if ( 'attachment' == $post_type ) {
		$sendback = admin_url( 'upload.php' );
	} else {
		$sendback = admin_url( 'edit.php' );
		if ( ! empty( $post_type ) ) {
			$sendback = add_query_arg( 'post_type', $post_type, $sendback );
		}
	}
} else {
	$sendback = remove_query_arg( array('trashed', 'untrashed', 'deleted', 'ids'), $sendback );
}

switch($action) {
case 'post-quickdraft-save':
	// Check nonce and capabilities
	$nonce = $_REQUEST['_wpnonce'];
	$error_msg = false;

	// For output of the quickdraft dashboard widget
	require_once ABSPATH . 'wp-admin/includes/dashboard.php';

	if ( ! wp_verify_nonce( $nonce, 'add-post' ) )
		$error_msg = __( 'Unable to submit this form, please refresh and try again.' );

	if ( ! current_user_can( get_post_type_object( 'post' )->cap->create_posts ) ) {
		exit;
	}

	if ( $error_msg )
		return wp_dashboard_quick_press( $error_msg );

	$post = get_post( $_REQUEST['post_ID'] );
	check_admin_referer( 'add-' . $post->post_type );

	$_POST['comment_status'] = get_default_comment_status( $post->post_type );
	$_POST['ping_status']    = get_default_comment_status( $post->post_type, 'pingback' );

	edit_post();
	wp_dashboard_quick_press();
	exit;

case 'postajaxpost':
case 'post':
	check_admin_referer( 'add-' . $post_type );
	$post_id = 'postajaxpost' == $action ? edit_post() : write_post();
	redirect_post( $post_id );
	exit();

case 'edit':
	$editing = true;

	if ( empty( $post_id ) ) {
		wp_redirect( admin_url('post.php') );
		exit();
	}

	if ( ! $post )
		wp_die( __( 'You attempted to edit an item that doesn&#8217;t exist. Perhaps it was deleted?' ) );

	if ( ! $post_type_object )
		wp_die( __( 'Invalid post type.' ) );

	if ( ! in_array( $typenow, get_post_types( array( 'show_ui' => true ) ) ) ) {
		wp_die( __( 'Sorry, you are not allowed to edit posts in this post type.' ) );
	}

	if ( ! current_user_can( 'edit_post', $post_id ) )
		wp_die( __( 'Sorry, you are not allowed to edit this item.' ) );

	if ( 'trash' == $post->post_status )
		wp_die( __( 'You can&#8217;t edit this item because it is in the Trash. Please restore it and try again.' ) );

	if ( ! empty( $_GET['get-post-lock'] ) ) {
		check_admin_referer( 'lock-post_' . $post_id );
		wp_set_post_lock( $post_id );
		wp_redirect( get_edit_post_link( $post_id, 'url' ) );
		exit();
	}

	$post_type = $post->post_type;
	if ( 'post' == $post_type ) {
		$parent_file = "edit.php";
		$submenu_file = "edit.php";
		$post_new_file = "post-new.php";
	} elseif ( 'attachment' == $post_type ) {
		$parent_file = 'upload.php';
		$submenu_file = 'upload.php';
		$post_new_file = 'media-new.php';
	} else {
		if ( isset( $post_type_object ) && $post_type_object->show_in_menu && $post_type_object->show_in_menu !== true )
			$parent_file = $post_type_object->show_in_menu;
		else
			$parent_file = "edit.php?post_type=$post_type";
		$submenu_file = "edit.php?post_type=$post_type";
		$post_new_file = "post-new.php?post_type=$post_type";
	}

	$title = $post_type_object->labels->edit_item;

	/**
	 * Allows replacement of the editor.
	 *
	 * @since 4.9.0
	 *
	 * @param boolean      Whether to replace the editor. Default false.
	 * @param object $post Post object.
	 */
	if ( apply_filters( 'replace_editor', false, $post ) === true ) {
		break;
	}

	if ( use_block_editor_for_post( $post ) ) {
		include( ABSPATH . 'wp-admin/edit-form-blocks.php' );
		break;
	}

	if ( ! wp_check_post_lock( $post->ID ) ) {
		$active_post_lock = wp_set_post_lock( $post->ID );

		if ( 'attachment' !== $post_type )
			wp_enqueue_script('autosave');
	}

	$post = get_post( $post_id, OBJECT, 'edit' );

	if ( post_type_supports($post_type, 'comments') ) {
		wp_enqueue_script('admin-comments');
		enqueue_comment_hotkeys_js();
	}

	include( ABSPATH . 'wp-admin/edit-form-advanced.php' );

	break;

case 'editattachment':
	check_admin_referer('update-post_' . $post_id);

	// Don't let these be changed
	unset($_POST['guid']);
	$_POST['post_type'] = 'attachment';

	// Update the thumbnail filename
	$newmeta = wp_get_attachment_metadata( $post_id, true );
	$newmeta['thumb'] = wp_basename( $_POST['thumb'] );

	wp_update_attachment_metadata( $post_id, $newmeta );

case 'editpost':
	check_admin_referer('update-post_' . $post_id);

	$post_id = edit_post();

	// Session cookie flag that the post was saved
	if ( isset( $_COOKIE['wp-saving-post'] ) && $_COOKIE['wp-saving-post'] === $post_id . '-check' ) {
		setcookie( 'wp-saving-post', $post_id . '-saved', time() + DAY_IN_SECONDS, ADMIN_COOKIE_PATH, COOKIE_DOMAIN, is_ssl() );
	}

	redirect_post($post_id); // Send user on their way while we keep working

	exit();

case 'trash':
	check_admin_referer('trash-post_' . $post_id);

	if ( ! $post )
		wp_die( __( 'The item you are trying to move to the Trash no longer exists.' ) );

	if ( ! $post_type_object )
		wp_die( __( 'Invalid post type.' ) );

	if ( ! current_user_can( 'delete_post', $post_id ) )
		wp_die( __( 'Sorry, you are not allowed to move this item to the Trash.' ) );

	if ( $user_id = wp_check_post_lock( $post_id ) ) {
		$user = get_userdata( $user_id );
		wp_die( sprintf( __( 'You cannot move this item to the Trash. %s is currently editing.' ), $user->display_name ) );
	}

	if ( ! wp_trash_post( $post_id ) )
		wp_die( __( 'Error in moving to Trash.' ) );

	wp_redirect( add_query_arg( array('trashed' => 1, 'ids' => $post_id), $sendback ) );
	exit();

case 'untrash':
	check_admin_referer('untrash-post_' . $post_id);

	if ( ! $post )
		wp_die( __( 'The item you are trying to restore from the Trash no longer exists.' ) );

	if ( ! $post_type_object )
		wp_die( __( 'Invalid post type.' ) );

	if ( ! current_user_can( 'delete_post', $post_id ) )
		wp_die( __( 'Sorry, you are not allowed to restore this item from the Trash.' ) );

	if ( ! wp_untrash_post( $post_id ) )
		wp_die( __( 'Error in restoring from Trash.' ) );

	wp_redirect( add_query_arg('untrashed', 1, $sendback) );
	exit();

case 'delete':
	check_admin_referer('delete-post_' . $post_id);

	if ( ! $post )
		wp_die( __( 'This item has already been deleted.' ) );

	if ( ! $post_type_object )
		wp_die( __( 'Invalid post type.' ) );

	if ( ! current_user_can( 'delete_post', $post_id ) )
		wp_die( __( 'Sorry, you are not allowed to delete this item.' ) );

	if ( $post->post_type == 'attachment' ) {
		$force = ( ! MEDIA_TRASH );
		if ( ! wp_delete_attachment( $post_id, $force ) )
			wp_die( __( 'Error in deleting.' ) );
	} else {
		if ( ! wp_delete_post( $post_id, true ) )
			wp_die( __( 'Error in deleting.' ) );
	}

	wp_redirect( add_query_arg('deleted', 1, $sendback) );
	exit();

case 'preview':
	check_admin_referer( 'update-post_' . $post_id );

	$url = post_preview();

	wp_redirect($url);
	exit();

case 'toggle-custom-fields':
	check_admin_referer( 'toggle-custom-fields' );

	$current_user_id = get_current_user_id();
	if ( $current_user_id ) {
		$enable_custom_fields = (bool) get_user_meta( $current_user_id, 'enable_custom_fields', true );
		update_user_meta( $current_user_id, 'enable_custom_fields', ! $enable_custom_fields );
	}

	wp_safe_redirect( wp_get_referer() );
	exit();

default:
	/**
	 * Fires for a given custom post action request.
	 *
	 * The dynamic portion of the hook name, `$action`, refers to the custom post action.
	 *
	 * @since 4.6.0
	 *
	 * @param int $post_id Post ID sent with the request.
	 */
	do_action( "post_action_{$action}", $post_id );

	wp_redirect( admin_url('edit.php') );
	exit();
} // end switch
include( ABSPATH . 'wp-admin/admin-footer.php' );
home/xbodynamge/dev/wp-admin/includes/post.php000060400000214371151135376400015440 0ustar00<?php
/**
 * WordPress Post Administration API.
 *
 * @package WordPress
 * @subpackage Administration
 */

/**
 * Rename $_POST data from form names to DB post columns.
 *
 * Manipulates $_POST directly.
 *
 * @since 2.6.0
 *
 * @param bool $update Are we updating a pre-existing post?
 * @param array $post_data Array of post data. Defaults to the contents of $_POST.
 * @return object|bool WP_Error on failure, true on success.
 */
function _wp_translate_postdata( $update = false, $post_data = null ) {

	if ( empty($post_data) )
		$post_data = &$_POST;

	if ( $update )
		$post_data['ID'] = (int) $post_data['post_ID'];

	$ptype = get_post_type_object( $post_data['post_type'] );

	if ( $update && ! current_user_can( 'edit_post', $post_data['ID'] ) ) {
		if ( 'page' == $post_data['post_type'] )
			return new WP_Error( 'edit_others_pages', __( 'Sorry, you are not allowed to edit pages as this user.' ) );
		else
			return new WP_Error( 'edit_others_posts', __( 'Sorry, you are not allowed to edit posts as this user.' ) );
	} elseif ( ! $update && ! current_user_can( $ptype->cap->create_posts ) ) {
		if ( 'page' == $post_data['post_type'] )
			return new WP_Error( 'edit_others_pages', __( 'Sorry, you are not allowed to create pages as this user.' ) );
		else
			return new WP_Error( 'edit_others_posts', __( 'Sorry, you are not allowed to create posts as this user.' ) );
	}

	if ( isset( $post_data['content'] ) )
		$post_data['post_content'] = $post_data['content'];

	if ( isset( $post_data['excerpt'] ) )
		$post_data['post_excerpt'] = $post_data['excerpt'];

	if ( isset( $post_data['parent_id'] ) )
		$post_data['post_parent'] = (int) $post_data['parent_id'];

	if ( isset($post_data['trackback_url']) )
		$post_data['to_ping'] = $post_data['trackback_url'];

	$post_data['user_ID'] = get_current_user_id();

	if (!empty ( $post_data['post_author_override'] ) ) {
		$post_data['post_author'] = (int) $post_data['post_author_override'];
	} else {
		if (!empty ( $post_data['post_author'] ) ) {
			$post_data['post_author'] = (int) $post_data['post_author'];
		} else {
			$post_data['post_author'] = (int) $post_data['user_ID'];
		}
	}

	if ( isset( $post_data['user_ID'] ) && ( $post_data['post_author'] != $post_data['user_ID'] )
		 && ! current_user_can( $ptype->cap->edit_others_posts ) ) {
		if ( $update ) {
			if ( 'page' == $post_data['post_type'] )
				return new WP_Error( 'edit_others_pages', __( 'Sorry, you are not allowed to edit pages as this user.' ) );
			else
				return new WP_Error( 'edit_others_posts', __( 'Sorry, you are not allowed to edit posts as this user.' ) );
		} else {
			if ( 'page' == $post_data['post_type'] )
				return new WP_Error( 'edit_others_pages', __( 'Sorry, you are not allowed to create pages as this user.' ) );
			else
				return new WP_Error( 'edit_others_posts', __( 'Sorry, you are not allowed to create posts as this user.' ) );
		}
	}

	if ( ! empty( $post_data['post_status'] ) ) {
		$post_data['post_status'] = sanitize_key( $post_data['post_status'] );

		// No longer an auto-draft
		if ( 'auto-draft' === $post_data['post_status'] ) {
			$post_data['post_status'] = 'draft';
		}

		if ( ! get_post_status_object( $post_data['post_status'] ) ) {
			unset( $post_data['post_status'] );
		}
	}

	// What to do based on which button they pressed
	if ( isset($post_data['saveasdraft']) && '' != $post_data['saveasdraft'] )
		$post_data['post_status'] = 'draft';
	if ( isset($post_data['saveasprivate']) && '' != $post_data['saveasprivate'] )
		$post_data['post_status'] = 'private';
	if ( isset($post_data['publish']) && ( '' != $post_data['publish'] ) && ( !isset($post_data['post_status']) || $post_data['post_status'] != 'private' ) )
		$post_data['post_status'] = 'publish';
	if ( isset($post_data['advanced']) && '' != $post_data['advanced'] )
		$post_data['post_status'] = 'draft';
	if ( isset($post_data['pending']) && '' != $post_data['pending'] )
		$post_data['post_status'] = 'pending';

	if ( isset( $post_data['ID'] ) )
		$post_id = $post_data['ID'];
	else
		$post_id = false;
	$previous_status = $post_id ? get_post_field( 'post_status', $post_id ) : false;

	if ( isset( $post_data['post_status'] ) && 'private' == $post_data['post_status'] && ! current_user_can( $ptype->cap->publish_posts ) ) {
		$post_data['post_status'] = $previous_status ? $previous_status : 'pending';
	}

	$published_statuses = array( 'publish', 'future' );

	// Posts 'submitted for approval' present are submitted to $_POST the same as if they were being published.
	// Change status from 'publish' to 'pending' if user lacks permissions to publish or to resave published posts.
	if ( isset($post_data['post_status']) && (in_array( $post_data['post_status'], $published_statuses ) && !current_user_can( $ptype->cap->publish_posts )) )
		if ( ! in_array( $previous_status, $published_statuses ) || !current_user_can( 'edit_post', $post_id ) )
			$post_data['post_status'] = 'pending';

	if ( ! isset( $post_data['post_status'] ) ) {
		$post_data['post_status'] = 'auto-draft' === $previous_status ? 'draft' : $previous_status;
	}

	if ( isset( $post_data['post_password'] ) && ! current_user_can( $ptype->cap->publish_posts ) ) {
		unset( $post_data['post_password'] );
	}

	if (!isset( $post_data['comment_status'] ))
		$post_data['comment_status'] = 'closed';

	if (!isset( $post_data['ping_status'] ))
		$post_data['ping_status'] = 'closed';

	foreach ( array('aa', 'mm', 'jj', 'hh', 'mn') as $timeunit ) {
		if ( !empty( $post_data['hidden_' . $timeunit] ) && $post_data['hidden_' . $timeunit] != $post_data[$timeunit] ) {
			$post_data['edit_date'] = '1';
			break;
		}
	}

	if ( !empty( $post_data['edit_date'] ) ) {
		$aa = $post_data['aa'];
		$mm = $post_data['mm'];
		$jj = $post_data['jj'];
		$hh = $post_data['hh'];
		$mn = $post_data['mn'];
		$ss = $post_data['ss'];
		$aa = ($aa <= 0 ) ? date('Y') : $aa;
		$mm = ($mm <= 0 ) ? date('n') : $mm;
		$jj = ($jj > 31 ) ? 31 : $jj;
		$jj = ($jj <= 0 ) ? date('j') : $jj;
		$hh = ($hh > 23 ) ? $hh -24 : $hh;
		$mn = ($mn > 59 ) ? $mn -60 : $mn;
		$ss = ($ss > 59 ) ? $ss -60 : $ss;
		$post_data['post_date'] = sprintf( "%04d-%02d-%02d %02d:%02d:%02d", $aa, $mm, $jj, $hh, $mn, $ss );
		$valid_date = wp_checkdate( $mm, $jj, $aa, $post_data['post_date'] );
		if ( !$valid_date ) {
			return new WP_Error( 'invalid_date', __( 'Invalid date.' ) );
		}
		$post_data['post_date_gmt'] = get_gmt_from_date( $post_data['post_date'] );
	}

	if ( isset( $post_data['post_category'] ) ) {
		$category_object = get_taxonomy( 'category' );
		if ( ! current_user_can( $category_object->cap->assign_terms ) ) {
			unset( $post_data['post_category'] );
		}
	}

	return $post_data;
}

/**
 * Returns only allowed post data fields
 *
 * @since 4.9.9
 *
 * @param array $post_data Array of post data. Defaults to the contents of $_POST.
 * @return object|bool WP_Error on failure, true on success.
 */
function _wp_get_allowed_postdata( $post_data = null ) {
	if ( empty( $post_data ) ) {
		$post_data = $_POST;
	}

	// Pass through errors
	if ( is_wp_error( $post_data ) ) {
		return $post_data;
	}

	return array_diff_key( $post_data, array_flip( array( 'meta_input', 'file', 'guid' ) ) );
}

/**
 * Update an existing post with values provided in $_POST.
 *
 * @since 1.5.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param array $post_data Optional.
 * @return int Post ID.
 */
function edit_post( $post_data = null ) {
	global $wpdb;

	if ( empty($post_data) )
		$post_data = &$_POST;

	// Clear out any data in internal vars.
	unset( $post_data['filter'] );

	$post_ID = (int) $post_data['post_ID'];
	$post = get_post( $post_ID );
	$post_data['post_type'] = $post->post_type;
	$post_data['post_mime_type'] = $post->post_mime_type;

	if ( ! empty( $post_data['post_status'] ) ) {
		$post_data['post_status'] = sanitize_key( $post_data['post_status'] );

		if ( 'inherit' == $post_data['post_status'] ) {
			unset( $post_data['post_status'] );
		}
	}

	$ptype = get_post_type_object($post_data['post_type']);
	if ( !current_user_can( 'edit_post', $post_ID ) ) {
		if ( 'page' == $post_data['post_type'] )
			wp_die( __('Sorry, you are not allowed to edit this page.' ));
		else
			wp_die( __('Sorry, you are not allowed to edit this post.' ));
	}

	if ( post_type_supports( $ptype->name, 'revisions' ) ) {
		$revisions = wp_get_post_revisions( $post_ID, array( 'order' => 'ASC', 'posts_per_page' => 1 ) );
		$revision = current( $revisions );

		// Check if the revisions have been upgraded
		if ( $revisions && _wp_get_post_revision_version( $revision ) < 1 )
			_wp_upgrade_revisions_of_post( $post, wp_get_post_revisions( $post_ID ) );
	}

	if ( isset($post_data['visibility']) ) {
		switch ( $post_data['visibility'] ) {
			case 'public' :
				$post_data['post_password'] = '';
				break;
			case 'password' :
				unset( $post_data['sticky'] );
				break;
			case 'private' :
				$post_data['post_status'] = 'private';
				$post_data['post_password'] = '';
				unset( $post_data['sticky'] );
				break;
		}
	}

	$post_data = _wp_translate_postdata( true, $post_data );
	if ( is_wp_error($post_data) )
		wp_die( $post_data->get_error_message() );
	$translated = _wp_get_allowed_postdata( $post_data );

	// Post Formats
	if ( isset( $post_data['post_format'] ) )
		set_post_format( $post_ID, $post_data['post_format'] );

	$format_meta_urls = array( 'url', 'link_url', 'quote_source_url' );
	foreach ( $format_meta_urls as $format_meta_url ) {
		$keyed = '_format_' . $format_meta_url;
		if ( isset( $post_data[ $keyed ] ) )
			update_post_meta( $post_ID, $keyed, wp_slash( esc_url_raw( wp_unslash( $post_data[ $keyed ] ) ) ) );
	}

	$format_keys = array( 'quote', 'quote_source_name', 'image', 'gallery', 'audio_embed', 'video_embed' );

	foreach ( $format_keys as $key ) {
		$keyed = '_format_' . $key;
		if ( isset( $post_data[ $keyed ] ) ) {
			if ( current_user_can( 'unfiltered_html' ) )
				update_post_meta( $post_ID, $keyed, $post_data[ $keyed ] );
			else
				update_post_meta( $post_ID, $keyed, wp_filter_post_kses( $post_data[ $keyed ] ) );
		}
	}

	if ( 'attachment' === $post_data['post_type'] && preg_match( '#^(audio|video)/#', $post_data['post_mime_type'] ) ) {
		$id3data = wp_get_attachment_metadata( $post_ID );
		if ( ! is_array( $id3data ) ) {
			$id3data = array();
		}

		foreach ( wp_get_attachment_id3_keys( $post, 'edit' ) as $key => $label ) {
			if ( isset( $post_data[ 'id3_' . $key ] ) ) {
				$id3data[ $key ] = sanitize_text_field( wp_unslash( $post_data[ 'id3_' . $key ] ) );
			}
		}
		wp_update_attachment_metadata( $post_ID, $id3data );
	}

	// Meta Stuff
	if ( isset($post_data['meta']) && $post_data['meta'] ) {
		foreach ( $post_data['meta'] as $key => $value ) {
			if ( !$meta = get_post_meta_by_id( $key ) )
				continue;
			if ( $meta->post_id != $post_ID )
				continue;
			if ( is_protected_meta( $meta->meta_key, 'post' ) || ! current_user_can( 'edit_post_meta', $post_ID, $meta->meta_key ) )
				continue;
			if ( is_protected_meta( $value['key'], 'post' ) || ! current_user_can( 'edit_post_meta', $post_ID, $value['key'] ) )
				continue;
			update_meta( $key, $value['key'], $value['value'] );
		}
	}

	if ( isset($post_data['deletemeta']) && $post_data['deletemeta'] ) {
		foreach ( $post_data['deletemeta'] as $key => $value ) {
			if ( !$meta = get_post_meta_by_id( $key ) )
				continue;
			if ( $meta->post_id != $post_ID )
				continue;
			if ( is_protected_meta( $meta->meta_key, 'post' ) || ! current_user_can( 'delete_post_meta', $post_ID, $meta->meta_key ) )
				continue;
			delete_meta( $key );
		}
	}

	// Attachment stuff
	if ( 'attachment' == $post_data['post_type'] ) {
		if ( isset( $post_data[ '_wp_attachment_image_alt' ] ) ) {
			$image_alt = wp_unslash( $post_data['_wp_attachment_image_alt'] );
			if ( $image_alt != get_post_meta( $post_ID, '_wp_attachment_image_alt', true ) ) {
				$image_alt = wp_strip_all_tags( $image_alt, true );
				// update_meta expects slashed.
				update_post_meta( $post_ID, '_wp_attachment_image_alt', wp_slash( $image_alt ) );
			}
		}

		$attachment_data = isset( $post_data['attachments'][ $post_ID ] ) ? $post_data['attachments'][ $post_ID ] : array();

		/** This filter is documented in wp-admin/includes/media.php */
		$translated = apply_filters( 'attachment_fields_to_save', $translated, $attachment_data );
	}

	// Convert taxonomy input to term IDs, to avoid ambiguity.
	if ( isset( $post_data['tax_input'] ) ) {
		foreach ( (array) $post_data['tax_input'] as $taxonomy => $terms ) {
			// Hierarchical taxonomy data is already sent as term IDs, so no conversion is necessary.
			if ( is_taxonomy_hierarchical( $taxonomy ) ) {
				continue;
			}

			/*
			 * Assume that a 'tax_input' string is a comma-separated list of term names.
			 * Some languages may use a character other than a comma as a delimiter, so we standardize on
			 * commas before parsing the list.
			 */
			if ( ! is_array( $terms ) ) {
				$comma = _x( ',', 'tag delimiter' );
				if ( ',' !== $comma ) {
					$terms = str_replace( $comma, ',', $terms );
				}
				$terms = explode( ',', trim( $terms, " \n\t\r\0\x0B," ) );
			}

			$clean_terms = array();
			foreach ( $terms as $term ) {
				// Empty terms are invalid input.
				if ( empty( $term ) ) {
					continue;
				}

				$_term = get_terms( $taxonomy, array(
					'name' => $term,
					'fields' => 'ids',
					'hide_empty' => false,
				) );

				if ( ! empty( $_term ) ) {
					$clean_terms[] = intval( $_term[0] );
				} else {
					// No existing term was found, so pass the string. A new term will be created.
					$clean_terms[] = $term;
				}
			}

			$translated['tax_input'][ $taxonomy ] = $clean_terms;
		}
	}

	add_meta( $post_ID );

	update_post_meta( $post_ID, '_edit_last', get_current_user_id() );

	$success = wp_update_post( $translated );
	// If the save failed, see if we can sanity check the main fields and try again
	if ( ! $success && is_callable( array( $wpdb, 'strip_invalid_text_for_column' ) ) ) {
		$fields = array( 'post_title', 'post_content', 'post_excerpt' );

		foreach ( $fields as $field ) {
			if ( isset( $translated[ $field ] ) ) {
				$translated[ $field ] = $wpdb->strip_invalid_text_for_column( $wpdb->posts, $field, $translated[ $field ] );
			}
		}

		wp_update_post( $translated );
	}

	// Now that we have an ID we can fix any attachment anchor hrefs
	_fix_attachment_links( $post_ID );

	wp_set_post_lock( $post_ID );

	if ( current_user_can( $ptype->cap->edit_others_posts ) && current_user_can( $ptype->cap->publish_posts ) ) {
		if ( ! empty( $post_data['sticky'] ) )
			stick_post( $post_ID );
		else
			unstick_post( $post_ID );
	}

	return $post_ID;
}

/**
 * Process the post data for the bulk editing of posts.
 *
 * Updates all bulk edited posts/pages, adding (but not removing) tags and
 * categories. Skips pages when they would be their own parent or child.
 *
 * @since 2.7.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param array $post_data Optional, the array of post data to process if not provided will use $_POST superglobal.
 * @return array
 */
function bulk_edit_posts( $post_data = null ) {
	global $wpdb;

	if ( empty($post_data) )
		$post_data = &$_POST;

	if ( isset($post_data['post_type']) )
		$ptype = get_post_type_object($post_data['post_type']);
	else
		$ptype = get_post_type_object('post');

	if ( !current_user_can( $ptype->cap->edit_posts ) ) {
		if ( 'page' == $ptype->name )
			wp_die( __('Sorry, you are not allowed to edit pages.'));
		else
			wp_die( __('Sorry, you are not allowed to edit posts.'));
	}

	if ( -1 == $post_data['_status'] ) {
		$post_data['post_status'] = null;
		unset($post_data['post_status']);
	} else {
		$post_data['post_status'] = $post_data['_status'];
	}
	unset($post_data['_status']);

	if ( ! empty( $post_data['post_status'] ) ) {
		$post_data['post_status'] = sanitize_key( $post_data['post_status'] );

		if ( 'inherit' == $post_data['post_status'] ) {
			unset( $post_data['post_status'] );
		}
	}

	$post_IDs = array_map( 'intval', (array) $post_data['post'] );

	$reset = array(
		'post_author', 'post_status', 'post_password',
		'post_parent', 'page_template', 'comment_status',
		'ping_status', 'keep_private', 'tax_input',
		'post_category', 'sticky', 'post_format',
	);

	foreach ( $reset as $field ) {
		if ( isset($post_data[$field]) && ( '' == $post_data[$field] || -1 == $post_data[$field] ) )
			unset($post_data[$field]);
	}

	if ( isset($post_data['post_category']) ) {
		if ( is_array($post_data['post_category']) && ! empty($post_data['post_category']) )
			$new_cats = array_map( 'absint', $post_data['post_category'] );
		else
			unset($post_data['post_category']);
	}

	$tax_input = array();
	if ( isset($post_data['tax_input'])) {
		foreach ( $post_data['tax_input'] as $tax_name => $terms ) {
			if ( empty($terms) )
				continue;
			if ( is_taxonomy_hierarchical( $tax_name ) ) {
				$tax_input[ $tax_name ] = array_map( 'absint', $terms );
			} else {
				$comma = _x( ',', 'tag delimiter' );
				if ( ',' !== $comma )
					$terms = str_replace( $comma, ',', $terms );
				$tax_input[ $tax_name ] = explode( ',', trim( $terms, " \n\t\r\0\x0B," ) );
			}
		}
	}

	if ( isset($post_data['post_parent']) && ($parent = (int) $post_data['post_parent']) ) {
		$pages = $wpdb->get_results("SELECT ID, post_parent FROM $wpdb->posts WHERE post_type = 'page'");
		$children = array();

		for ( $i = 0; $i < 50 && $parent > 0; $i++ ) {
			$children[] = $parent;

			foreach ( $pages as $page ) {
				if ( $page->ID == $parent ) {
					$parent = $page->post_parent;
					break;
				}
			}
		}
	}

	$updated = $skipped = $locked = array();
	$shared_post_data = $post_data;

	foreach ( $post_IDs as $post_ID ) {
		// Start with fresh post data with each iteration.
		$post_data = $shared_post_data;

		$post_type_object = get_post_type_object( get_post_type( $post_ID ) );

		if ( !isset( $post_type_object ) || ( isset($children) && in_array($post_ID, $children) ) || !current_user_can( 'edit_post', $post_ID ) ) {
			$skipped[] = $post_ID;
			continue;
		}

		if ( wp_check_post_lock( $post_ID ) ) {
			$locked[] = $post_ID;
			continue;
		}

		$post = get_post( $post_ID );
		$tax_names = get_object_taxonomies( $post );
		foreach ( $tax_names as $tax_name ) {
			$taxonomy_obj = get_taxonomy($tax_name);
			if ( isset( $tax_input[$tax_name]) && current_user_can( $taxonomy_obj->cap->assign_terms ) )
				$new_terms = $tax_input[$tax_name];
			else
				$new_terms = array();

			if ( $taxonomy_obj->hierarchical )
				$current_terms = (array) wp_get_object_terms( $post_ID, $tax_name, array('fields' => 'ids') );
			else
				$current_terms = (array) wp_get_object_terms( $post_ID, $tax_name, array('fields' => 'names') );

			$post_data['tax_input'][$tax_name] = array_merge( $current_terms, $new_terms );
		}

		if ( isset($new_cats) && in_array( 'category', $tax_names ) ) {
			$cats = (array) wp_get_post_categories($post_ID);
			$post_data['post_category'] = array_unique( array_merge($cats, $new_cats) );
			unset( $post_data['tax_input']['category'] );
		}

		$post_data['post_ID']        = $post_ID;
		$post_data['post_type'] = $post->post_type;
		$post_data['post_mime_type'] = $post->post_mime_type;

		foreach ( array( 'comment_status', 'ping_status', 'post_author' ) as $field ) {
			if ( ! isset( $post_data[ $field ] ) ) {
				$post_data[ $field ] = $post->$field;
			}
		}

		$post_data = _wp_translate_postdata( true, $post_data );
		if ( is_wp_error( $post_data ) ) {
			$skipped[] = $post_ID;
			continue;
		}
		$post_data = _wp_get_allowed_postdata( $post_data );

		if ( isset( $shared_post_data['post_format'] ) ) {
			set_post_format( $post_ID, $shared_post_data['post_format'] );
			unset( $post_data['tax_input']['post_format'] );
		}

		$updated[] = wp_update_post( $post_data );

		if ( isset( $post_data['sticky'] ) && current_user_can( $ptype->cap->edit_others_posts ) ) {
			if ( 'sticky' == $post_data['sticky'] )
				stick_post( $post_ID );
			else
				unstick_post( $post_ID );
		}
	}

	return array( 'updated' => $updated, 'skipped' => $skipped, 'locked' => $locked );
}

/**
 * Default post information to use when populating the "Write Post" form.
 *
 * @since 2.0.0
 *
 * @param string $post_type    Optional. A post type string. Default 'post'.
 * @param bool   $create_in_db Optional. Whether to insert the post into database. Default false.
 * @return WP_Post Post object containing all the default post data as attributes
 */
function get_default_post_to_edit( $post_type = 'post', $create_in_db = false ) {
	$post_title = '';
	if ( !empty( $_REQUEST['post_title'] ) )
		$post_title = esc_html( wp_unslash( $_REQUEST['post_title'] ));

	$post_content = '';
	if ( !empty( $_REQUEST['content'] ) )
		$post_content = esc_html( wp_unslash( $_REQUEST['content'] ));

	$post_excerpt = '';
	if ( !empty( $_REQUEST['excerpt'] ) )
		$post_excerpt = esc_html( wp_unslash( $_REQUEST['excerpt'] ));

	if ( $create_in_db ) {
		$post_id = wp_insert_post( array( 'post_title' => __( 'Auto Draft' ), 'post_type' => $post_type, 'post_status' => 'auto-draft' ) );
		$post = get_post( $post_id );
		if ( current_theme_supports( 'post-formats' ) && post_type_supports( $post->post_type, 'post-formats' ) && get_option( 'default_post_format' ) )
			set_post_format( $post, get_option( 'default_post_format' ) );
	} else {
		$post = new stdClass;
		$post->ID = 0;
		$post->post_author = '';
		$post->post_date = '';
		$post->post_date_gmt = '';
		$post->post_password = '';
		$post->post_name = '';
		$post->post_type = $post_type;
		$post->post_status = 'draft';
		$post->to_ping = '';
		$post->pinged = '';
		$post->comment_status = get_default_comment_status( $post_type );
		$post->ping_status = get_default_comment_status( $post_type, 'pingback' );
		$post->post_pingback = get_option( 'default_pingback_flag' );
		$post->post_category = get_option( 'default_category' );
		$post->page_template = 'default';
		$post->post_parent = 0;
		$post->menu_order = 0;
		$post = new WP_Post( $post );
	}

	/**
	 * Filters the default post content initially used in the "Write Post" form.
	 *
	 * @since 1.5.0
	 *
	 * @param string  $post_content Default post content.
	 * @param WP_Post $post         Post object.
	 */
	$post->post_content = (string) apply_filters( 'default_content', $post_content, $post );

	/**
	 * Filters the default post title initially used in the "Write Post" form.
	 *
	 * @since 1.5.0
	 *
	 * @param string  $post_title Default post title.
	 * @param WP_Post $post       Post object.
	 */
	$post->post_title = (string) apply_filters( 'default_title', $post_title, $post );

	/**
	 * Filters the default post excerpt initially used in the "Write Post" form.
	 *
	 * @since 1.5.0
	 *
	 * @param string  $post_excerpt Default post excerpt.
	 * @param WP_Post $post         Post object.
	 */
	$post->post_excerpt = (string) apply_filters( 'default_excerpt', $post_excerpt, $post );

	return $post;
}

/**
 * Determine if a post exists based on title, content, and date
 *
 * @since 2.0.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $title Post title
 * @param string $content Optional post content
 * @param string $date Optional post date
 * @return int Post ID if post exists, 0 otherwise.
 */
function post_exists($title, $content = '', $date = '') {
	global $wpdb;

	$post_title = wp_unslash( sanitize_post_field( 'post_title', $title, 0, 'db' ) );
	$post_content = wp_unslash( sanitize_post_field( 'post_content', $content, 0, 'db' ) );
	$post_date = wp_unslash( sanitize_post_field( 'post_date', $date, 0, 'db' ) );

	$query = "SELECT ID FROM $wpdb->posts WHERE 1=1";
	$args = array();

	if ( !empty ( $date ) ) {
		$query .= ' AND post_date = %s';
		$args[] = $post_date;
	}

	if ( !empty ( $title ) ) {
		$query .= ' AND post_title = %s';
		$args[] = $post_title;
	}

	if ( !empty ( $content ) ) {
		$query .= ' AND post_content = %s';
		$args[] = $post_content;
	}

	if ( !empty ( $args ) )
		return (int) $wpdb->get_var( $wpdb->prepare($query, $args) );

	return 0;
}

/**
 * Creates a new post from the "Write Post" form using $_POST information.
 *
 * @since 2.1.0
 *
 * @global WP_User $current_user
 *
 * @return int|WP_Error
 */
function wp_write_post() {
	if ( isset($_POST['post_type']) )
		$ptype = get_post_type_object($_POST['post_type']);
	else
		$ptype = get_post_type_object('post');

	if ( !current_user_can( $ptype->cap->edit_posts ) ) {
		if ( 'page' == $ptype->name )
			return new WP_Error( 'edit_pages', __( 'Sorry, you are not allowed to create pages on this site.' ) );
		else
			return new WP_Error( 'edit_posts', __( 'Sorry, you are not allowed to create posts or drafts on this site.' ) );
	}

	$_POST['post_mime_type'] = '';

	// Clear out any data in internal vars.
	unset( $_POST['filter'] );

	// Edit don't write if we have a post id.
	if ( isset( $_POST['post_ID'] ) )
		return edit_post();

	if ( isset($_POST['visibility']) ) {
		switch ( $_POST['visibility'] ) {
			case 'public' :
				$_POST['post_password'] = '';
				break;
			case 'password' :
				unset( $_POST['sticky'] );
				break;
			case 'private' :
				$_POST['post_status'] = 'private';
				$_POST['post_password'] = '';
				unset( $_POST['sticky'] );
				break;
		}
	}

	$translated = _wp_translate_postdata( false );
	if ( is_wp_error($translated) )
		return $translated;
	$translated = _wp_get_allowed_postdata( $translated );

	// Create the post.
	$post_ID = wp_insert_post( $translated );
	if ( is_wp_error( $post_ID ) )
		return $post_ID;

	if ( empty($post_ID) )
		return 0;

	add_meta( $post_ID );

	add_post_meta( $post_ID, '_edit_last', $GLOBALS['current_user']->ID );

	// Now that we have an ID we can fix any attachment anchor hrefs
	_fix_attachment_links( $post_ID );

	wp_set_post_lock( $post_ID );

	return $post_ID;
}

/**
 * Calls wp_write_post() and handles the errors.
 *
 * @since 2.0.0
 *
 * @return int|null
 */
function write_post() {
	$result = wp_write_post();
	if ( is_wp_error( $result ) )
		wp_die( $result->get_error_message() );
	else
		return $result;
}

//
// Post Meta
//

/**
 * Add post meta data defined in $_POST superglobal for post with given ID.
 *
 * @since 1.2.0
 *
 * @param int $post_ID
 * @return int|bool
 */
function add_meta( $post_ID ) {
	$post_ID = (int) $post_ID;

	$metakeyselect = isset($_POST['metakeyselect']) ? wp_unslash( trim( $_POST['metakeyselect'] ) ) : '';
	$metakeyinput = isset($_POST['metakeyinput']) ? wp_unslash( trim( $_POST['metakeyinput'] ) ) : '';
	$metavalue = isset($_POST['metavalue']) ? $_POST['metavalue'] : '';
	if ( is_string( $metavalue ) )
		$metavalue = trim( $metavalue );

	if ( ( ( '#NONE#' != $metakeyselect ) && ! empty( $metakeyselect ) ) || ! empty( $metakeyinput ) ) {
		/*
		 * We have a key/value pair. If both the select and the input
		 * for the key have data, the input takes precedence.
		 */
 		if ( '#NONE#' != $metakeyselect )
			$metakey = $metakeyselect;

		if ( $metakeyinput )
			$metakey = $metakeyinput; // default

		if ( is_protected_meta( $metakey, 'post' ) || ! current_user_can( 'add_post_meta', $post_ID, $metakey ) )
			return false;

		$metakey = wp_slash( $metakey );

		return add_post_meta( $post_ID, $metakey, $metavalue );
	}

	return false;
} // add_meta

/**
 * Delete post meta data by meta ID.
 *
 * @since 1.2.0
 *
 * @param int $mid
 * @return bool
 */
function delete_meta( $mid ) {
	return delete_metadata_by_mid( 'post' , $mid );
}

/**
 * Get a list of previously defined keys.
 *
 * @since 1.2.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @return mixed
 */
function get_meta_keys() {
	global $wpdb;

	$keys = $wpdb->get_col( "
			SELECT meta_key
			FROM $wpdb->postmeta
			GROUP BY meta_key
			ORDER BY meta_key" );

	return $keys;
}

/**
 * Get post meta data by meta ID.
 *
 * @since 2.1.0
 *
 * @param int $mid
 * @return object|bool
 */
function get_post_meta_by_id( $mid ) {
	return get_metadata_by_mid( 'post', $mid );
}

/**
 * Get meta data for the given post ID.
 *
 * @since 1.2.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int $postid
 * @return mixed
 */
function has_meta( $postid ) {
	global $wpdb;

	return $wpdb->get_results( $wpdb->prepare("SELECT meta_key, meta_value, meta_id, post_id
			FROM $wpdb->postmeta WHERE post_id = %d
			ORDER BY meta_key,meta_id", $postid), ARRAY_A );
}

/**
 * Update post meta data by meta ID.
 *
 * @since 1.2.0
 *
 * @param int    $meta_id
 * @param string $meta_key Expect Slashed
 * @param string $meta_value Expect Slashed
 * @return bool
 */
function update_meta( $meta_id, $meta_key, $meta_value ) {
	$meta_key = wp_unslash( $meta_key );
	$meta_value = wp_unslash( $meta_value );

	return update_metadata_by_mid( 'post', $meta_id, $meta_value, $meta_key );
}

//
// Private
//

/**
 * Replace hrefs of attachment anchors with up-to-date permalinks.
 *
 * @since 2.3.0
 * @access private
 *
 * @param int|object $post Post ID or post object.
 * @return void|int|WP_Error Void if nothing fixed. 0 or WP_Error on update failure. The post ID on update success.
 */
function _fix_attachment_links( $post ) {
	$post = get_post( $post, ARRAY_A );
	$content = $post['post_content'];

	// Don't run if no pretty permalinks or post is not published, scheduled, or privately published.
	if ( ! get_option( 'permalink_structure' ) || ! in_array( $post['post_status'], array( 'publish', 'future', 'private' ) ) )
		return;

	// Short if there aren't any links or no '?attachment_id=' strings (strpos cannot be zero)
	if ( !strpos($content, '?attachment_id=') || !preg_match_all( '/<a ([^>]+)>[\s\S]+?<\/a>/', $content, $link_matches ) )
		return;

	$site_url = get_bloginfo('url');
	$site_url = substr( $site_url, (int) strpos($site_url, '://') ); // remove the http(s)
	$replace = '';

	foreach ( $link_matches[1] as $key => $value ) {
		if ( !strpos($value, '?attachment_id=') || !strpos($value, 'wp-att-')
			|| !preg_match( '/href=(["\'])[^"\']*\?attachment_id=(\d+)[^"\']*\\1/', $value, $url_match )
			|| !preg_match( '/rel=["\'][^"\']*wp-att-(\d+)/', $value, $rel_match ) )
				continue;

		$quote = $url_match[1]; // the quote (single or double)
		$url_id = (int) $url_match[2];
		$rel_id = (int) $rel_match[1];

		if ( !$url_id || !$rel_id || $url_id != $rel_id || strpos($url_match[0], $site_url) === false )
			continue;

		$link = $link_matches[0][$key];
		$replace = str_replace( $url_match[0], 'href=' . $quote . get_attachment_link( $url_id ) . $quote, $link );

		$content = str_replace( $link, $replace, $content );
	}

	if ( $replace ) {
		$post['post_content'] = $content;
		// Escape data pulled from DB.
		$post = add_magic_quotes($post);

		return wp_update_post($post);
	}
}

/**
 * Get all the possible statuses for a post_type
 *
 * @since 2.5.0
 *
 * @param string $type The post_type you want the statuses for
 * @return array As array of all the statuses for the supplied post type
 */
function get_available_post_statuses($type = 'post') {
	$stati = wp_count_posts($type);

	return array_keys(get_object_vars($stati));
}

/**
 * Run the wp query to fetch the posts for listing on the edit posts page
 *
 * @since 2.5.0
 *
 * @param array|bool $q Array of query variables to use to build the query or false to use $_GET superglobal.
 * @return array
 */
function wp_edit_posts_query( $q = false ) {
	if ( false === $q )
		$q = $_GET;
	$q['m'] = isset($q['m']) ? (int) $q['m'] : 0;
	$q['cat'] = isset($q['cat']) ? (int) $q['cat'] : 0;
	$post_stati  = get_post_stati();

	if ( isset($q['post_type']) && in_array( $q['post_type'], get_post_types() ) )
		$post_type = $q['post_type'];
	else
		$post_type = 'post';

	$avail_post_stati = get_available_post_statuses($post_type);
	$post_status      = '';
	$perm             = '';

	if ( isset($q['post_status']) && in_array( $q['post_status'], $post_stati ) ) {
		$post_status = $q['post_status'];
		$perm = 'readable';
	}

	$orderby = '';

	if ( isset( $q['orderby'] ) ) {
		$orderby = $q['orderby'];
	} elseif ( isset( $q['post_status'] ) && in_array( $q['post_status'], array( 'pending', 'draft' ) ) ) {
		$orderby = 'modified';
	}

	$order = '';

	if ( isset( $q['order'] ) ) {
		$order = $q['order'];
	} elseif ( isset( $q['post_status'] ) && 'pending' == $q['post_status'] ) {
		$order = 'ASC';
	}

	$per_page = "edit_{$post_type}_per_page";
	$posts_per_page = (int) get_user_option( $per_page );
	if ( empty( $posts_per_page ) || $posts_per_page < 1 )
		$posts_per_page = 20;

	/**
	 * Filters the number of items per page to show for a specific 'per_page' type.
	 *
	 * The dynamic portion of the hook name, `$post_type`, refers to the post type.
	 *
	 * Some examples of filter hooks generated here include: 'edit_attachment_per_page',
	 * 'edit_post_per_page', 'edit_page_per_page', etc.
	 *
	 * @since 3.0.0
	 *
	 * @param int $posts_per_page Number of posts to display per page for the given post
	 *                            type. Default 20.
	 */
	$posts_per_page = apply_filters( "edit_{$post_type}_per_page", $posts_per_page );

	/**
	 * Filters the number of posts displayed per page when specifically listing "posts".
	 *
	 * @since 2.8.0
	 *
	 * @param int    $posts_per_page Number of posts to be displayed. Default 20.
	 * @param string $post_type      The post type.
	 */
	$posts_per_page = apply_filters( 'edit_posts_per_page', $posts_per_page, $post_type );

	$query = compact('post_type', 'post_status', 'perm', 'order', 'orderby', 'posts_per_page');

	// Hierarchical types require special args.
	if ( is_post_type_hierarchical( $post_type ) && empty( $orderby ) ) {
		$query['orderby'] = 'menu_order title';
		$query['order'] = 'asc';
		$query['posts_per_page'] = -1;
		$query['posts_per_archive_page'] = -1;
		$query['fields'] = 'id=>parent';
	}

	if ( ! empty( $q['show_sticky'] ) )
		$query['post__in'] = (array) get_option( 'sticky_posts' );

	wp( $query );

	return $avail_post_stati;
}

/**
 * Get all available post MIME types for a given post type.
 *
 * @since 2.5.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $type
 * @return mixed
 */
function get_available_post_mime_types($type = 'attachment') {
	global $wpdb;

	$types = $wpdb->get_col($wpdb->prepare("SELECT DISTINCT post_mime_type FROM $wpdb->posts WHERE post_type = %s", $type));
	return $types;
}

/**
 * Get the query variables for the current attachments request.
 *
 * @since 4.2.0
 *
 * @param array|false $q Optional. Array of query variables to use to build the query or false
 *                       to use $_GET superglobal. Default false.
 * @return array The parsed query vars.
 */
function wp_edit_attachments_query_vars( $q = false ) {
	if ( false === $q ) {
		$q = $_GET;
	}
	$q['m']   = isset( $q['m'] ) ? (int) $q['m'] : 0;
	$q['cat'] = isset( $q['cat'] ) ? (int) $q['cat'] : 0;
	$q['post_type'] = 'attachment';
	$post_type = get_post_type_object( 'attachment' );
	$states = 'inherit';
	if ( current_user_can( $post_type->cap->read_private_posts ) ) {
		$states .= ',private';
	}

	$q['post_status'] = isset( $q['status'] ) && 'trash' == $q['status'] ? 'trash' : $states;
	$q['post_status'] = isset( $q['attachment-filter'] ) && 'trash' == $q['attachment-filter'] ? 'trash' : $states;

	$media_per_page = (int) get_user_option( 'upload_per_page' );
	if ( empty( $media_per_page ) || $media_per_page < 1 ) {
		$media_per_page = 20;
	}

	/**
	 * Filters the number of items to list per page when listing media items.
	 *
	 * @since 2.9.0
	 *
	 * @param int $media_per_page Number of media to list. Default 20.
	 */
	$q['posts_per_page'] = apply_filters( 'upload_per_page', $media_per_page );

	$post_mime_types = get_post_mime_types();
	if ( isset($q['post_mime_type']) && !array_intersect( (array) $q['post_mime_type'], array_keys($post_mime_types) ) ) {
		unset($q['post_mime_type']);
	}

	foreach ( array_keys( $post_mime_types ) as $type ) {
		if ( isset( $q['attachment-filter'] ) && "post_mime_type:$type" == $q['attachment-filter'] ) {
			$q['post_mime_type'] = $type;
			break;
		}
	}

	if ( isset( $q['detached'] ) || ( isset( $q['attachment-filter'] ) && 'detached' == $q['attachment-filter'] ) ) {
		$q['post_parent'] = 0;
	}

	if ( isset( $q['mine'] ) || ( isset( $q['attachment-filter'] ) && 'mine' == $q['attachment-filter'] ) ) {
		$q['author'] = get_current_user_id();
	}

	// Filter query clauses to include filenames.
	if ( isset( $q['s'] ) ) {
		add_filter( 'posts_clauses', '_filter_query_attachment_filenames' );
	}

	return $q;
}

/**
 * Executes a query for attachments. An array of WP_Query arguments
 * can be passed in, which will override the arguments set by this function.
 *
 * @since 2.5.0
 *
 * @param array|false $q Array of query variables to use to build the query or false to use $_GET superglobal.
 * @return array
 */
function wp_edit_attachments_query( $q = false ) {
	wp( wp_edit_attachments_query_vars( $q ) );

	$post_mime_types = get_post_mime_types();
	$avail_post_mime_types = get_available_post_mime_types( 'attachment' );

	return array( $post_mime_types, $avail_post_mime_types );
}

/**
 * Returns the list of classes to be used by a meta box.
 *
 * @since 2.5.0
 *
 * @param string $id
 * @param string $page
 * @return string
 */
function postbox_classes( $id, $page ) {
	if ( isset( $_GET['edit'] ) && $_GET['edit'] == $id ) {
		$classes = array( '' );
	} elseif ( $closed = get_user_option('closedpostboxes_'.$page ) ) {
		if ( !is_array( $closed ) ) {
			$classes = array( '' );
		} else {
			$classes = in_array( $id, $closed ) ? array( 'closed' ) : array( '' );
		}
	} else {
		$classes = array( '' );
	}

	/**
	 * Filters the postbox classes for a specific screen and screen ID combo.
	 *
	 * The dynamic portions of the hook name, `$page` and `$id`, refer to
	 * the screen and screen ID, respectively.
	 *
	 * @since 3.2.0
	 *
	 * @param array $classes An array of postbox classes.
	 */
	$classes = apply_filters( "postbox_classes_{$page}_{$id}", $classes );
	return implode( ' ', $classes );
}

/**
 * Get a sample permalink based off of the post name.
 *
 * @since 2.5.0
 *
 * @param int    $id    Post ID or post object.
 * @param string $title Optional. Title to override the post's current title when generating the post name. Default null.
 * @param string $name  Optional. Name to override the post name. Default null.
 * @return array Array containing the sample permalink with placeholder for the post name, and the post name.
 */
function get_sample_permalink($id, $title = null, $name = null) {
	$post = get_post( $id );
	if ( ! $post )
		return array( '', '' );

	$ptype = get_post_type_object($post->post_type);

	$original_status = $post->post_status;
	$original_date = $post->post_date;
	$original_name = $post->post_name;

	// Hack: get_permalink() would return ugly permalink for drafts, so we will fake that our post is published.
	if ( in_array( $post->post_status, array( 'draft', 'pending', 'future' ) ) ) {
		$post->post_status = 'publish';
		$post->post_name = sanitize_title($post->post_name ? $post->post_name : $post->post_title, $post->ID);
	}

	// If the user wants to set a new name -- override the current one
	// Note: if empty name is supplied -- use the title instead, see #6072
	if ( !is_null($name) )
		$post->post_name = sanitize_title($name ? $name : $title, $post->ID);

	$post->post_name = wp_unique_post_slug($post->post_name, $post->ID, $post->post_status, $post->post_type, $post->post_parent);

	$post->filter = 'sample';

	$permalink = get_permalink($post, true);

	// Replace custom post_type Token with generic pagename token for ease of use.
	$permalink = str_replace("%$post->post_type%", '%pagename%', $permalink);

	// Handle page hierarchy
	if ( $ptype->hierarchical ) {
		$uri = get_page_uri($post);
		if ( $uri ) {
			$uri = untrailingslashit($uri);
			$uri = strrev( stristr( strrev( $uri ), '/' ) );
			$uri = untrailingslashit($uri);
		}

		/** This filter is documented in wp-admin/edit-tag-form.php */
		$uri = apply_filters( 'editable_slug', $uri, $post );
		if ( !empty($uri) )
			$uri .= '/';
		$permalink = str_replace('%pagename%', "{$uri}%pagename%", $permalink);
	}

	/** This filter is documented in wp-admin/edit-tag-form.php */
	$permalink = array( $permalink, apply_filters( 'editable_slug', $post->post_name, $post ) );
	$post->post_status = $original_status;
	$post->post_date = $original_date;
	$post->post_name = $original_name;
	unset($post->filter);

	/**
	 * Filters the sample permalink.
	 *
	 * @since 4.4.0
	 *
	 * @param array   $permalink Array containing the sample permalink with placeholder for the post name, and the post name.
	 * @param int     $post_id   Post ID.
	 * @param string  $title     Post title.
	 * @param string  $name      Post name (slug).
	 * @param WP_Post $post      Post object.
	 */
	return apply_filters( 'get_sample_permalink', $permalink, $post->ID, $title, $name, $post );
}

/**
 * Returns the HTML of the sample permalink slug editor.
 *
 * @since 2.5.0
 *
 * @param int    $id        Post ID or post object.
 * @param string $new_title Optional. New title. Default null.
 * @param string $new_slug  Optional. New slug. Default null.
 * @return string The HTML of the sample permalink slug editor.
 */
function get_sample_permalink_html( $id, $new_title = null, $new_slug = null ) {
	$post = get_post( $id );
	if ( ! $post )
		return '';

	list($permalink, $post_name) = get_sample_permalink($post->ID, $new_title, $new_slug);

	$view_link = false;
	$preview_target = '';

	if ( current_user_can( 'read_post', $post->ID ) ) {
		if ( 'draft' === $post->post_status || empty( $post->post_name ) ) {
			$view_link = get_preview_post_link( $post );
			$preview_target = " target='wp-preview-{$post->ID}'";
		} else {
			if ( 'publish' === $post->post_status || 'attachment' === $post->post_type ) {
				$view_link = get_permalink( $post );
			} else {
				// Allow non-published (private, future) to be viewed at a pretty permalink, in case $post->post_name is set
				$view_link = str_replace( array( '%pagename%', '%postname%' ), $post->post_name, $permalink );
			}
		}
	}

	// Permalinks without a post/page name placeholder don't have anything to edit
	if ( false === strpos( $permalink, '%postname%' ) && false === strpos( $permalink, '%pagename%' ) ) {
		$return = '<strong>' . __( 'Permalink:' ) . "</strong>\n";

		if ( false !== $view_link ) {
			$display_link = urldecode( $view_link );
			$return .= '<a id="sample-permalink" href="' . esc_url( $view_link ) . '"' . $preview_target . '>' . esc_html( $display_link ) . "</a>\n";
		} else {
			$return .= '<span id="sample-permalink">' . $permalink . "</span>\n";
		}

		// Encourage a pretty permalink setting
		if ( '' == get_option( 'permalink_structure' ) && current_user_can( 'manage_options' ) && !( 'page' == get_option('show_on_front') && $id == get_option('page_on_front') ) ) {
			$return .= '<span id="change-permalinks"><a href="options-permalink.php" class="button button-small" target="_blank">' . __('Change Permalinks') . "</a></span>\n";
		}
	} else {
		if ( mb_strlen( $post_name ) > 34 ) {
			$post_name_abridged = mb_substr( $post_name, 0, 16 ) . '&hellip;' . mb_substr( $post_name, -16 );
		} else {
			$post_name_abridged = $post_name;
		}

		$post_name_html = '<span id="editable-post-name">' . esc_html( $post_name_abridged ) . '</span>';
		$display_link = str_replace( array( '%pagename%', '%postname%' ), $post_name_html, esc_html( urldecode( $permalink ) ) );

		$return = '<strong>' . __( 'Permalink:' ) . "</strong>\n";
		$return .= '<span id="sample-permalink"><a href="' . esc_url( $view_link ) . '"' . $preview_target . '>' . $display_link . "</a></span>\n";
		$return .= '&lrm;'; // Fix bi-directional text display defect in RTL languages.
		$return .= '<span id="edit-slug-buttons"><button type="button" class="edit-slug button button-small hide-if-no-js" aria-label="' . __( 'Edit permalink' ) . '">' . __( 'Edit' ) . "</button></span>\n";
		$return .= '<span id="editable-post-name-full">' . esc_html( $post_name ) . "</span>\n";
	}

	/**
	 * Filters the sample permalink HTML markup.
	 *
	 * @since 2.9.0
	 * @since 4.4.0 Added `$post` parameter.
	 *
	 * @param string  $return    Sample permalink HTML markup.
	 * @param int     $post_id   Post ID.
	 * @param string  $new_title New sample permalink title.
	 * @param string  $new_slug  New sample permalink slug.
	 * @param WP_Post $post      Post object.
	 */
	$return = apply_filters( 'get_sample_permalink_html', $return, $post->ID, $new_title, $new_slug, $post );

	return $return;
}

/**
 * Output HTML for the post thumbnail meta-box.
 *
 * @since 2.9.0
 *
 * @param int $thumbnail_id ID of the attachment used for thumbnail
 * @param mixed $post The post ID or object associated with the thumbnail, defaults to global $post.
 * @return string html
 */
function _wp_post_thumbnail_html( $thumbnail_id = null, $post = null ) {
	$_wp_additional_image_sizes = wp_get_additional_image_sizes();

	$post               = get_post( $post );
	$post_type_object   = get_post_type_object( $post->post_type );
	$set_thumbnail_link = '<p class="hide-if-no-js"><a href="%s" id="set-post-thumbnail"%s class="thickbox">%s</a></p>';
	$upload_iframe_src  = get_upload_iframe_src( 'image', $post->ID );

	$content = sprintf( $set_thumbnail_link,
		esc_url( $upload_iframe_src ),
		'', // Empty when there's no featured image set, `aria-describedby` attribute otherwise.
		esc_html( $post_type_object->labels->set_featured_image )
	);

	if ( $thumbnail_id && get_post( $thumbnail_id ) ) {
		$size = isset( $_wp_additional_image_sizes['post-thumbnail'] ) ? 'post-thumbnail' : array( 266, 266 );

		/**
		 * Filters the size used to display the post thumbnail image in the 'Featured Image' meta box.
		 *
		 * Note: When a theme adds 'post-thumbnail' support, a special 'post-thumbnail'
		 * image size is registered, which differs from the 'thumbnail' image size
		 * managed via the Settings > Media screen. See the `$size` parameter description
		 * for more information on default values.
		 *
		 * @since 4.4.0
		 *
		 * @param string|array $size         Post thumbnail image size to display in the meta box. Accepts any valid
		 *                                   image size, or an array of width and height values in pixels (in that order).
		 *                                   If the 'post-thumbnail' size is set, default is 'post-thumbnail'. Otherwise,
		 *                                   default is an array with 266 as both the height and width values.
		 * @param int          $thumbnail_id Post thumbnail attachment ID.
		 * @param WP_Post      $post         The post object associated with the thumbnail.
		 */
		$size = apply_filters( 'admin_post_thumbnail_size', $size, $thumbnail_id, $post );

		$thumbnail_html = wp_get_attachment_image( $thumbnail_id, $size );

		if ( ! empty( $thumbnail_html ) ) {
			$content = sprintf( $set_thumbnail_link,
				esc_url( $upload_iframe_src ),
				' aria-describedby="set-post-thumbnail-desc"',
				$thumbnail_html
			);
			$content .= '<p class="hide-if-no-js howto" id="set-post-thumbnail-desc">' . __( 'Click the image to edit or update' ) . '</p>';
			$content .= '<p class="hide-if-no-js"><a href="#" id="remove-post-thumbnail">' . esc_html( $post_type_object->labels->remove_featured_image ) . '</a></p>';
		}
	}

	$content .= '<input type="hidden" id="_thumbnail_id" name="_thumbnail_id" value="' . esc_attr( $thumbnail_id ? $thumbnail_id : '-1' ) . '" />';

	/**
	 * Filters the admin post thumbnail HTML markup to return.
	 *
	 * @since 2.9.0
	 * @since 3.5.0 Added the `$post_id` parameter.
	 * @since 4.6.0 Added the `$thumbnail_id` parameter.
	 *
	 * @param string $content      Admin post thumbnail HTML markup.
	 * @param int    $post_id      Post ID.
	 * @param int    $thumbnail_id Thumbnail ID.
	 */
	return apply_filters( 'admin_post_thumbnail_html', $content, $post->ID, $thumbnail_id );
}

/**
 * Check to see if the post is currently being edited by another user.
 *
 * @since 2.5.0
 *
 * @param int $post_id ID of the post to check for editing.
 * @return int|false ID of the user with lock. False if the post does not exist, post is not locked,
 *                   the user with lock does not exist, or the post is locked by current user.
 */
function wp_check_post_lock( $post_id ) {
	if ( ! $post = get_post( $post_id ) ) {
		return false;
	}

	if ( ! $lock = get_post_meta( $post->ID, '_edit_lock', true ) ) {
		return false;
	}

	$lock = explode( ':', $lock );
	$time = $lock[0];
	$user = isset( $lock[1] ) ? $lock[1] : get_post_meta( $post->ID, '_edit_last', true );

	if ( ! get_userdata( $user ) ) {
		return false;
	}

	/** This filter is documented in wp-admin/includes/ajax-actions.php */
	$time_window = apply_filters( 'wp_check_post_lock_window', 150 );

	if ( $time && $time > time() - $time_window && $user != get_current_user_id() ) {
		return $user;
	}

	return false;
}

/**
 * Mark the post as currently being edited by the current user
 *
 * @since 2.5.0
 *
 * @param int $post_id ID of the post being edited.
 * @return array|false Array of the lock time and user ID. False if the post does not exist, or
 *                     there is no current user.
 */
function wp_set_post_lock( $post_id ) {
	if ( ! $post = get_post( $post_id ) ) {
		return false;
	}

	if ( 0 == ( $user_id = get_current_user_id() ) ) {
		return false;
	}

	$now = time();
	$lock = "$now:$user_id";

	update_post_meta( $post->ID, '_edit_lock', $lock );

	return array( $now, $user_id );
}

/**
 * Outputs the HTML for the notice to say that someone else is editing or has taken over editing of this post.
 *
 * @since 2.8.5
 * @return none
 */
function _admin_notice_post_locked() {
	if ( ! $post = get_post() )
		return;

	$user = null;
	if (  $user_id = wp_check_post_lock( $post->ID ) )
		$user = get_userdata( $user_id );

	if ( $user ) {

		/**
		 * Filters whether to show the post locked dialog.
		 *
		 * Returning a falsey value to the filter will short-circuit displaying the dialog.
		 *
		 * @since 3.6.0
		 *
		 * @param bool         $display Whether to display the dialog. Default true.
		 * @param WP_Post      $post    Post object.
		 * @param WP_User|bool $user    WP_User object on success, false otherwise.
		 */
		if ( ! apply_filters( 'show_post_locked_dialog', true, $post, $user ) )
			return;

		$locked = true;
	} else {
		$locked = false;
	}

	if ( $locked && ( $sendback = wp_get_referer() ) &&
		false === strpos( $sendback, 'post.php' ) && false === strpos( $sendback, 'post-new.php' ) ) {

		$sendback_text = __('Go back');
	} else {
		$sendback = admin_url( 'edit.php' );

		if ( 'post' != $post->post_type )
			$sendback = add_query_arg( 'post_type', $post->post_type, $sendback );

		$sendback_text = get_post_type_object( $post->post_type )->labels->all_items;
	}

	$hidden = $locked ? '' : ' hidden';

	?>
	<div id="post-lock-dialog" class="notification-dialog-wrap<?php echo $hidden; ?>">
	<div class="notification-dialog-background"></div>
	<div class="notification-dialog">
	<?php

	if ( $locked ) {
		$query_args = array();
		if ( get_post_type_object( $post->post_type )->public ) {
			if ( 'publish' == $post->post_status || $user->ID != $post->post_author ) {
				// Latest content is in autosave
				$nonce = wp_create_nonce( 'post_preview_' . $post->ID );
				$query_args['preview_id'] = $post->ID;
				$query_args['preview_nonce'] = $nonce;
			}
		}

		$preview_link = get_preview_post_link( $post->ID, $query_args );

		/**
		 * Filters whether to allow the post lock to be overridden.
		 *
		 * Returning a falsey value to the filter will disable the ability
		 * to override the post lock.
		 *
		 * @since 3.6.0
		 *
		 * @param bool    $override Whether to allow overriding post locks. Default true.
		 * @param WP_Post $post     Post object.
		 * @param WP_User $user     User object.
		 */
		$override = apply_filters( 'override_post_lock', true, $post, $user );
		$tab_last = $override ? '' : ' wp-tab-last';

		?>
		<div class="post-locked-message">
		<div class="post-locked-avatar"><?php echo get_avatar( $user->ID, 64 ); ?></div>
		<p class="currently-editing wp-tab-first" tabindex="0">
		<?php
			if ( $override ) {
				/* translators: %s: user's display name */
				printf( __( '%s is already editing this post. Do you want to take over?' ), esc_html( $user->display_name ) );
			} else {
				/* translators: %s: user's display name */
				printf( __( '%s is already editing this post.' ), esc_html( $user->display_name ) );
			}
		?>
		</p>
		<?php
		/**
		 * Fires inside the post locked dialog before the buttons are displayed.
		 *
		 * @since 3.6.0
		 *
		 * @param WP_Post $post Post object.
		 */
		do_action( 'post_locked_dialog', $post );
		?>
		<p>
		<a class="button" href="<?php echo esc_url( $sendback ); ?>"><?php echo $sendback_text; ?></a>
		<?php if ( $preview_link ) { ?>
		<a class="button<?php echo $tab_last; ?>" href="<?php echo esc_url( $preview_link ); ?>"><?php _e('Preview'); ?></a>
		<?php
		}

		// Allow plugins to prevent some users overriding the post lock
		if ( $override ) {
			?>
			<a class="button button-primary wp-tab-last" href="<?php echo esc_url( add_query_arg( 'get-post-lock', '1', wp_nonce_url( get_edit_post_link( $post->ID, 'url' ), 'lock-post_' . $post->ID ) ) ); ?>"><?php _e('Take over'); ?></a>
			<?php
		}

		?>
		</p>
		</div>
		<?php
	} else {
		?>
		<div class="post-taken-over">
			<div class="post-locked-avatar"></div>
			<p class="wp-tab-first" tabindex="0">
			<span class="currently-editing"></span><br />
			<span class="locked-saving hidden"><img src="<?php echo esc_url( admin_url( 'images/spinner-2x.gif' ) ); ?>" width="16" height="16" alt="" /> <?php _e( 'Saving revision&hellip;' ); ?></span>
			<span class="locked-saved hidden"><?php _e('Your latest changes were saved as a revision.'); ?></span>
			</p>
			<?php
			/**
			 * Fires inside the dialog displayed when a user has lost the post lock.
			 *
			 * @since 3.6.0
			 *
			 * @param WP_Post $post Post object.
			 */
			do_action( 'post_lock_lost_dialog', $post );
			?>
			<p><a class="button button-primary wp-tab-last" href="<?php echo esc_url( $sendback ); ?>"><?php echo $sendback_text; ?></a></p>
		</div>
		<?php
	}

	?>
	</div>
	</div>
	<?php
}

/**
 * Creates autosave data for the specified post from $_POST data.
 *
 * @since 2.6.0
 *
 * @param mixed $post_data Associative array containing the post data or int post ID.
 * @return mixed The autosave revision ID. WP_Error or 0 on error.
 */
function wp_create_post_autosave( $post_data ) {
	if ( is_numeric( $post_data ) ) {
		$post_id = $post_data;
		$post_data = $_POST;
	} else {
		$post_id = (int) $post_data['post_ID'];
	}

	$post_data = _wp_translate_postdata( true, $post_data );
	if ( is_wp_error( $post_data ) )
		return $post_data;
	$post_data = _wp_get_allowed_postdata( $post_data );

	$post_author = get_current_user_id();

	// Store one autosave per author. If there is already an autosave, overwrite it.
	if ( $old_autosave = wp_get_post_autosave( $post_id, $post_author ) ) {
		$new_autosave = _wp_post_revision_data( $post_data, true );
		$new_autosave['ID'] = $old_autosave->ID;
		$new_autosave['post_author'] = $post_author;

		// If the new autosave has the same content as the post, delete the autosave.
		$post = get_post( $post_id );
		$autosave_is_different = false;
		foreach ( array_intersect( array_keys( $new_autosave ), array_keys( _wp_post_revision_fields( $post ) ) ) as $field ) {
			if ( normalize_whitespace( $new_autosave[ $field ] ) != normalize_whitespace( $post->$field ) ) {
				$autosave_is_different = true;
				break;
			}
		}

		if ( ! $autosave_is_different ) {
			wp_delete_post_revision( $old_autosave->ID );
			return 0;
		}

		/**
		 * Fires before an autosave is stored.
		 *
		 * @since 4.1.0
		 *
		 * @param array $new_autosave Post array - the autosave that is about to be saved.
		 */
		do_action( 'wp_creating_autosave', $new_autosave );

		return wp_update_post( $new_autosave );
	}

	// _wp_put_post_revision() expects unescaped.
	$post_data = wp_unslash( $post_data );

	// Otherwise create the new autosave as a special post revision
	return _wp_put_post_revision( $post_data, true );
}

/**
 * Saves a draft or manually autosaves for the purpose of showing a post preview.
 *
 * @since 2.7.0
 *
 * @return string URL to redirect to show the preview.
 */
function post_preview() {

	$post_ID = (int) $_POST['post_ID'];
	$_POST['ID'] = $post_ID;

	if ( ! $post = get_post( $post_ID ) ) {
		wp_die( __( 'Sorry, you are not allowed to edit this post.' ) );
	}

	if ( ! current_user_can( 'edit_post', $post->ID ) ) {
		wp_die( __( 'Sorry, you are not allowed to edit this post.' ) );
	}

	$is_autosave = false;

	if ( ! wp_check_post_lock( $post->ID ) && get_current_user_id() == $post->post_author && ( 'draft' == $post->post_status || 'auto-draft' == $post->post_status ) ) {
		$saved_post_id = edit_post();
	} else {
		$is_autosave = true;

		if ( isset( $_POST['post_status'] ) && 'auto-draft' == $_POST['post_status'] )
			$_POST['post_status'] = 'draft';

		$saved_post_id = wp_create_post_autosave( $post->ID );
	}

	if ( is_wp_error( $saved_post_id ) )
		wp_die( $saved_post_id->get_error_message() );

	$query_args = array();

	if ( $is_autosave && $saved_post_id ) {
		$query_args['preview_id'] = $post->ID;
		$query_args['preview_nonce'] = wp_create_nonce( 'post_preview_' . $post->ID );

		if ( isset( $_POST['post_format'] ) ) {
			$query_args['post_format'] = empty( $_POST['post_format'] ) ? 'standard' : sanitize_key( $_POST['post_format'] );
		}

		if ( isset( $_POST['_thumbnail_id'] ) ) {
			$query_args['_thumbnail_id'] = ( intval( $_POST['_thumbnail_id'] ) <= 0 ) ? '-1' : intval( $_POST['_thumbnail_id'] );
		}
	}

	return get_preview_post_link( $post, $query_args );
}

/**
 * Save a post submitted with XHR
 *
 * Intended for use with heartbeat and autosave.js
 *
 * @since 3.9.0
 *
 * @param array $post_data Associative array of the submitted post data.
 * @return mixed The value 0 or WP_Error on failure. The saved post ID on success.
 *               The ID can be the draft post_id or the autosave revision post_id.
 */
function wp_autosave( $post_data ) {
	// Back-compat
	if ( ! defined( 'DOING_AUTOSAVE' ) )
		define( 'DOING_AUTOSAVE', true );

	$post_id = (int) $post_data['post_id'];
	$post_data['ID'] = $post_data['post_ID'] = $post_id;

	if ( false === wp_verify_nonce( $post_data['_wpnonce'], 'update-post_' . $post_id ) ) {
		return new WP_Error( 'invalid_nonce', __( 'Error while saving.' ) );
	}

	$post = get_post( $post_id );

	if ( ! current_user_can( 'edit_post', $post->ID ) ) {
		return new WP_Error( 'edit_posts', __( 'Sorry, you are not allowed to edit this item.' ) );
	}

	if ( 'auto-draft' == $post->post_status )
		$post_data['post_status'] = 'draft';

	if ( $post_data['post_type'] != 'page' && ! empty( $post_data['catslist'] ) )
		$post_data['post_category'] = explode( ',', $post_data['catslist'] );

	if ( ! wp_check_post_lock( $post->ID ) && get_current_user_id() == $post->post_author && ( 'auto-draft' == $post->post_status || 'draft' == $post->post_status ) ) {
		// Drafts and auto-drafts are just overwritten by autosave for the same user if the post is not locked
		return edit_post( wp_slash( $post_data ) );
	} else {
		// Non drafts or other users drafts are not overwritten. The autosave is stored in a special post revision for each user.
		return wp_create_post_autosave( wp_slash( $post_data ) );
	}
}

/**
 * Redirect to previous page.
 *
 * @param int $post_id Optional. Post ID.
 */
function redirect_post($post_id = '') {
	if ( isset($_POST['save']) || isset($_POST['publish']) ) {
		$status = get_post_status( $post_id );

		if ( isset( $_POST['publish'] ) ) {
			switch ( $status ) {
				case 'pending':
					$message = 8;
					break;
				case 'future':
					$message = 9;
					break;
				default:
					$message = 6;
			}
		} else {
			$message = 'draft' == $status ? 10 : 1;
		}

		$location = add_query_arg( 'message', $message, get_edit_post_link( $post_id, 'url' ) );
	} elseif ( isset($_POST['addmeta']) && $_POST['addmeta'] ) {
		$location = add_query_arg( 'message', 2, wp_get_referer() );
		$location = explode('#', $location);
		$location = $location[0] . '#postcustom';
	} elseif ( isset($_POST['deletemeta']) && $_POST['deletemeta'] ) {
		$location = add_query_arg( 'message', 3, wp_get_referer() );
		$location = explode('#', $location);
		$location = $location[0] . '#postcustom';
	} else {
		$location = add_query_arg( 'message', 4, get_edit_post_link( $post_id, 'url' ) );
	}

	/**
	 * Filters the post redirect destination URL.
	 *
	 * @since 2.9.0
	 *
	 * @param string $location The destination URL.
	 * @param int    $post_id  The post ID.
	 */
	wp_redirect( apply_filters( 'redirect_post_location', $location, $post_id ) );
	exit;
}

/**
 * Return whether the post can be edited in the block editor.
 *
 * @since 5.0.0
 *
 * @param int|WP_Post $post Post ID or WP_Post object.
 * @return bool Whether the post can be edited in the block editor.
 */
function use_block_editor_for_post( $post ) {
	$post = get_post( $post );

	if ( ! $post ) {
		return false;
	}

	// We're in the meta box loader, so don't use the block editor.
	if ( isset( $_GET['meta-box-loader'] ) ) {
		check_admin_referer( 'meta-box-loader' );
		return false;
	}

	// The posts page can't be edited in the block editor.
	if ( absint( get_option( 'page_for_posts' ) ) === $post->ID && empty( $post->post_content ) ) {
		return false;
	}

	$use_block_editor = use_block_editor_for_post_type( $post->post_type );

	/**
	 * Filter whether a post is able to be edited in the block editor.
	 *
	 * @since 5.0.0
	 *
	 * @param bool    $use_block_editor Whether the post can be edited or not.
	 * @param WP_Post $post             The post being checked.
	 */
	return apply_filters( 'use_block_editor_for_post', $use_block_editor, $post );
}

/**
 * Return whether a post type is compatible with the block editor.
 *
 * The block editor depends on the REST API, and if the post type is not shown in the
 * REST API, then it won't work with the block editor.
 *
 * @since 5.0.0
 *
 * @param string $post_type The post type.
 * @return bool Whether the post type can be edited with the block editor.
 */
function use_block_editor_for_post_type( $post_type ) {
	if ( ! post_type_exists( $post_type ) ) {
		return false;
	}

	if ( ! post_type_supports( $post_type, 'editor' ) ) {
		return false;
	}

	$post_type_object = get_post_type_object( $post_type );
	if ( $post_type_object && ! $post_type_object->show_in_rest ) {
		return false;
	}

	/**
	 * Filter whether a post is able to be edited in the block editor.
	 *
	 * @since 5.0.0
	 *
	 * @param bool   $use_block_editor  Whether the post type can be edited or not. Default true.
	 * @param string $post_type         The post type being checked.
	 */
	return apply_filters( 'use_block_editor_for_post_type', true, $post_type );
}

/**
 * Returns all the block categories that will be shown in the block editor.
 *
 * @since 5.0.0
 *
 * @param WP_Post $post Post object.
 * @return array Array of block categories.
 */
function get_block_categories( $post ) {
	$default_categories = array(
		array(
			'slug'  => 'common',
			'title' => __( 'Common Blocks' ),
			'icon'  => null,
		),
		array(
			'slug'  => 'formatting',
			'title' => __( 'Formatting' ),
			'icon'  => null,
		),
		array(
			'slug'  => 'layout',
			'title' => __( 'Layout Elements' ),
			'icon'  => null,
		),
		array(
			'slug'  => 'widgets',
			'title' => __( 'Widgets' ),
			'icon'  => null,
		),
		array(
			'slug'  => 'embed',
			'title' => __( 'Embeds' ),
			'icon'  => null,
		),
		array(
			'slug'  => 'reusable',
			'title' => __( 'Reusable Blocks' ),
			'icon'  => null,
		),
	);

	/**
	 * Filter the default array of block categories.
	 *
	 * @since 5.0.0
	 *
	 * @param array   $default_categories Array of block categories.
	 * @param WP_Post $post               Post being loaded.
	 */
	return apply_filters( 'block_categories', $default_categories, $post );
}

/**
 * Prepares server-registered blocks for the block editor.
 *
 * Returns an associative array of registered block data keyed by block name. Data includes properties
 * of a block relevant for client registration.
 *
 * @since 5.0.0
 *
 * @return array An associative array of registered block data.
 */
function get_block_editor_server_block_settings() {
	$block_registry = WP_Block_Type_Registry::get_instance();
	$blocks         = array();
	$keys_to_pick   = array( 'title', 'description', 'icon', 'category', 'keywords', 'supports', 'attributes' );

	foreach ( $block_registry->get_all_registered() as $block_name => $block_type ) {
		foreach ( $keys_to_pick as $key ) {
			if ( ! isset( $block_type->{ $key } ) ) {
				continue;
			}

			if ( ! isset( $blocks[ $block_name ] ) ) {
				$blocks[ $block_name ] = array();
			}

			$blocks[ $block_name ][ $key ] = $block_type->{ $key };
		}
	}

	return $blocks;
}

/**
 * Renders the meta boxes forms.
 *
 * @since 5.0.0
 */
function the_block_editor_meta_boxes() {
	global $post, $current_screen, $wp_meta_boxes;

	// Handle meta box state.
	$_original_meta_boxes = $wp_meta_boxes;

	/**
	 * Fires right before the meta boxes are rendered.
	 *
	 * This allows for the filtering of meta box data, that should already be
	 * present by this point. Do not use as a means of adding meta box data.
	 *
	 * @since 5.0.0
	 *
	 * @param array $wp_meta_boxes Global meta box state.
	 */
	$wp_meta_boxes = apply_filters( 'filter_block_editor_meta_boxes', $wp_meta_boxes );
	$locations     = array( 'side', 'normal', 'advanced' );
	$priorities    = array( 'high', 'sorted', 'core', 'default', 'low' );

	// Render meta boxes.
	?>
	<form class="metabox-base-form">
	<?php the_block_editor_meta_box_post_form_hidden_fields( $post ); ?>
	</form>
	<form id="toggle-custom-fields-form" method="post" action="<?php echo esc_attr( admin_url( 'post.php' ) ); ?>">
		<?php wp_nonce_field( 'toggle-custom-fields' ); ?>
		<input type="hidden" name="action" value="toggle-custom-fields" />
	</form>
	<?php foreach ( $locations as $location ) : ?>
		<form class="metabox-location-<?php echo esc_attr( $location ); ?>" onsubmit="return false;">
			<div id="poststuff" class="sidebar-open">
				<div id="postbox-container-2" class="postbox-container">
					<?php
					do_meta_boxes(
						$current_screen,
						$location,
						$post
					);
					?>
				</div>
			</div>
		</form>
	<?php endforeach; ?>
	<?php

	$meta_boxes_per_location = array();
	foreach ( $locations as $location ) {
		$meta_boxes_per_location[ $location ] = array();

		if ( ! isset( $wp_meta_boxes[ $current_screen->id ][ $location ] ) ) {
			continue;
		}

		foreach ( $priorities as $priority ) {
			if ( ! isset( $wp_meta_boxes[ $current_screen->id ][ $location ][ $priority ] ) ) {
				continue;
			}

			$meta_boxes = (array) $wp_meta_boxes[ $current_screen->id ][ $location ][ $priority ];
			foreach ( $meta_boxes as $meta_box ) {
				if ( false == $meta_box || ! $meta_box['title'] ) {
					continue;
				}

				// If a meta box is just here for back compat, don't show it in the block editor.
				if ( isset( $meta_box['args']['__back_compat_meta_box'] ) && $meta_box['args']['__back_compat_meta_box'] ) {
					continue;
				}

				$meta_boxes_per_location[ $location ][] = array(
					'id'    => $meta_box['id'],
					'title' => $meta_box['title'],
				);
			}
		}
	}

	/**
	 * Sadly we probably can not add this data directly into editor settings.
	 *
	 * Some meta boxes need admin_head to fire for meta box registry.
	 * admin_head fires after admin_enqueue_scripts, which is where we create our
	 * editor instance.
	 */
	$script = 'window._wpLoadBlockEditor.then( function() {
		wp.data.dispatch( \'core/edit-post\' ).setAvailableMetaBoxesPerLocation( ' . wp_json_encode( $meta_boxes_per_location ) . ' );
	} );';

	wp_add_inline_script( 'wp-edit-post', $script );

	/**
	 * When `wp-edit-post` is output in the `<head>`, the inline script needs to be manually printed. Otherwise,
	 * meta boxes will not display because inline scripts for `wp-edit-post` will not be printed again after this point.
	 */
	if ( wp_script_is( 'wp-edit-post', 'done' ) ) {
		printf( "<script type='text/javascript'>\n%s\n</script>\n", trim( $script ) );
	}

	/**
	 * If the 'postcustom' meta box is enabled, then we need to perform some
	 * extra initialization on it.
	 */
	$enable_custom_fields = (bool) get_user_meta( get_current_user_id(), 'enable_custom_fields', true );
	if ( $enable_custom_fields ) {
		$script = "( function( $ ) {
			if ( $('#postcustom').length ) {
				$( '#the-list' ).wpList( {
					addBefore: function( s ) {
						s.data += '&post_id=$post->ID';
						return s;
					},
					addAfter: function() {
						$('table#list-table').show();
					}
				});
			}
		} )( jQuery );";
 		wp_enqueue_script( 'wp-lists' );
		wp_add_inline_script( 'wp-lists', $script );
	}

	// Reset meta box data.
	$wp_meta_boxes = $_original_meta_boxes;
}

/**
 * Renders the hidden form required for the meta boxes form.
 *
 * @since 5.0.0
 *
 * @param WP_Post $post Current post object.
 */
function the_block_editor_meta_box_post_form_hidden_fields( $post ) {
	$form_extra = '';
	if ( 'auto-draft' === $post->post_status ) {
		$form_extra .= "<input type='hidden' id='auto_draft' name='auto_draft' value='1' />";
	}
	$form_action  = 'editpost';
	$nonce_action = 'update-post_' . $post->ID;
	$form_extra  .= "<input type='hidden' id='post_ID' name='post_ID' value='" . esc_attr( $post->ID ) . "' />";
	$referer      = wp_get_referer();
	$current_user = wp_get_current_user();
	$user_id      = $current_user->ID;
	wp_nonce_field( $nonce_action );

	/*
	 * Some meta boxes hook into these actions to add hidden input fields in the classic post form. For backwards
	 * compatibility, we can capture the output from these actions, and extract the hidden input fields.
	 */
	ob_start();
	/** This filter is documented in wp-admin/edit-form-advanced.php */
	do_action( 'edit_form_after_title', $post );
	/** This filter is documented in wp-admin/edit-form-advanced.php */
	do_action( 'edit_form_advanced', $post );
	$classic_output = ob_get_clean();

	$classic_elements = wp_html_split( $classic_output );
	$hidden_inputs    = '';
	foreach( $classic_elements as $element ) {
		if ( 0 !== strpos( $element, '<input ') ) {
			continue;
		}

		if ( preg_match( '/\stype=[\'"]hidden[\'"]\s/', $element ) ) {
			echo $element;
		}
	}
	?>
	<input type="hidden" id="user-id" name="user_ID" value="<?php echo (int) $user_id; ?>" />
	<input type="hidden" id="hiddenaction" name="action" value="<?php echo esc_attr( $form_action ); ?>" />
	<input type="hidden" id="originalaction" name="originalaction" value="<?php echo esc_attr( $form_action ); ?>" />
	<input type="hidden" id="post_type" name="post_type" value="<?php echo esc_attr( $post->post_type ); ?>" />
	<input type="hidden" id="original_post_status" name="original_post_status" value="<?php echo esc_attr( $post->post_status ); ?>" />
	<input type="hidden" id="referredby" name="referredby" value="<?php echo $referer ? esc_url( $referer ) : ''; ?>" />

	<?php
	if ( 'draft' !== get_post_status( $post ) ) {
		wp_original_referer_field( true, 'previous' );
	}
	echo $form_extra;
	wp_nonce_field( 'meta-box-order', 'meta-box-order-nonce', false );
	wp_nonce_field( 'closedpostboxes', 'closedpostboxesnonce', false );
	// Permalink title nonce.
	wp_nonce_field( 'samplepermalink', 'samplepermalinknonce', false );

	/**
	 * Add hidden input fields to the meta box save form.
	 *
	 * Hook into this action to print `<input type="hidden" ... />` fields, which will be POSTed back to
	 * the server when meta boxes are saved.
	 *
	 * @since 5.0.0
	 *
	 * @params WP_Post $post The post that is being edited.
	 */
	do_action( 'block_editor_meta_box_hidden_fields', $post );
}