Filters post thumbnail lookup to set the post thumbnail.
Parameters
$valuenull|array|stringrequired- The value to return – a single metadata value, or an array of values.
$post_idintrequired- Post ID.
$meta_keystringrequired- Meta key.
Source
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 || $post_id !== (int) $_REQUEST['preview_id']
|| '_thumbnail_id' !== $meta_key || 'revision' === $post->post_type
) {
return $value;
}
$thumbnail_id = (int) $_REQUEST['_thumbnail_id'];
if ( $thumbnail_id <= 0 ) {
return '';
}
return (string) $thumbnail_id;
}
Changelog
| Version | Description |
|---|---|
| 4.6.0 | Introduced. |
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