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<?php
/**
* Preview functions.
*
* @package zerif-lite
*/
/**
* Get a random image from demo content
* Can be recursive if a specific img size is not found
*
* @param int $i Maximum number of recalls.
*
* @return string
*/
function zerif_get_prevdem_img_src( $i = 0 ) {
// prevent infinite loop
if ( 10 == $i ) {
return '';
}
$path = get_template_directory() . '/ti-prevdem/img/';
// Build or re-build the global dem img array
if ( ! isset( $GLOBALS['prevdem_img'] ) || empty( $GLOBALS['prevdem_img'] ) ) {
$imgs = array();
$candidates = array();
if ( is_dir( $path ) ) {
$imgs = scandir( $path );
}
if ( ! $imgs || empty( $imgs ) ) {
return array();
}
foreach ( $imgs as $img ) {
if ( '.' === $img[0] || is_dir( $path . $img ) ) {
continue;
}
$candidates[] = $img;
}
$GLOBALS['prevdem_img'] = $candidates;
}
$candidates = $GLOBALS['prevdem_img'];
// get a random image name
$rand_key = array_rand( $candidates );
$img_name = $candidates[ $rand_key ];
// if file does not exists, reset the global and recursively call it again
if ( ! file_exists( $path . $img_name ) ) {
unset( $GLOBALS['prevdem_img'] );
$i++;
return zerif_get_prevdem_img_src( $i );
}
// unset all sizes of the img found and update the global
$new_candidates = $candidates;
foreach ( $candidates as $_key => $_img ) {
if ( substr( $_img, 0, strlen( "{$img_name}" ) ) === "{$img_name}" ) {
unset( $new_candidates[ $_key ] );
}
}
$GLOBALS['prevdem_img'] = $new_candidates;
return get_template_directory_uri() . '/ti-prevdem/img/' . $img_name;
}
/**
* Filter thumbnail image
*
* @param string $input Post thumbnail.
*/
function zerif_the_post_thumbnail( $input ) {
if ( empty( $input ) ) {
$placeholder = zerif_get_prevdem_img_src();
return '<img width="250" height="250" src="' . esc_url( $placeholder ) . '" class="attachment-zerif-post-thumbnail size-zerif-post-thumbnail wp-post-image">';
}
return $input;
}
add_filter( 'post_thumbnail_html', 'zerif_the_post_thumbnail' );