Alert: This function’s access is marked private. This means it is not intended for use by plugin or theme developers, only in other core functions. It is listed here for completeness.
_wp_preview_post_thumbnail_filter( null|array|string $value, int $post_id, string $meta_key ): null|array
Filters post thumbnail lookup to set the post thumbnail.
Parameters
-
$valuenull|array|string Required -
The value to return - a single metadata value, or an array of values.
-
$post_idint Required -
Post ID.
-
$meta_keystring Required -
Meta key.
Return
null|array The default return value or the post thumbnail meta array.
Source
File: wp-includes/revision.php.
View all references
function _wp_preview_post_thumbnail_filter( $value, $post_id, $meta_key ) {
$post = get_post();
if ( ! $post ) {
return $value;
}
if ( empty( $_REQUEST['_thumbnail_id'] ) ||
empty( $_REQUEST['preview_id'] ) ||
$post->ID != $post_id ||
'_thumbnail_id' !== $meta_key ||
'revision' === $post->post_type ||
$post_id != $_REQUEST['preview_id'] ) {
return $value;
}
$thumbnail_id = (int) $_REQUEST['_thumbnail_id'];
if ( $thumbnail_id <= 0 ) {
return '';
}
return (string) $thumbnail_id;
}
Changelog
| Version | Description |
|---|---|
| 4.6.0 | Introduced. |