has_post_thumbnail( int|WP_Post $post = null ): bool

25function has_post_thumbnail( $post = null ) {26	$thumbnail_id  = get_post_thumbnail_id( $post );27	$has_thumbnail = (bool) $thumbnail_id;28 29	/**30	 * Filters whether a post has a post thumbnail.31	 *32	 * @since 5.1.033	 *34	 * @param bool             $has_thumbnail true if the post has a post thumbnail, otherwise false.35	 * @param int|WP_Post|null $post          Post ID or WP_Post object. Default is global `$post`.36	 * @param int|false        $thumbnail_id  Post thumbnail ID or false if the post does not exist.37	 */38	return (bool) apply_filters( 'has_post_thumbnail', $has_thumbnail, $post, $thumbnail_id );39}