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 )
Filters post thumbnail lookup to set the post thumbnail.
Parameters
- $value
-
(null|array|string) (Required) The value to return
- a single metadata value, or an array of values.
- $post_id
-
(int) (Required) Post ID.
- $meta_key
-
(string) (Required) Meta key.
Return
(null|array) The default return value or the post thumbnail meta array.
Source
File: wp-includes/revision.php
function _wp_preview_post_thumbnail_filter( $value, $post_id, $meta_key ) {
if ( ! $post = get_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 = intval( $_REQUEST['_thumbnail_id'] );
if ( $thumbnail_id <= 0 ) {
return '';
}
return strval( $thumbnail_id );
}
Changelog
| Version | Description |
|---|---|
| WP-4.6.0 | Introduced. |