get_post_thumbnail_id( int|WP_Post $post = null )

Retrieve post thumbnail ID.


Parameters

$post

(Optional) Post ID or WP_Post object. Default is global $post.

Default value: null


Return

(string|int) Post thumbnail ID or empty string.


Source

File: wp-includes/post-thumbnail-template.php

function get_post_thumbnail_id( $post = null ) {
	$post = get_post( $post );
	if ( ! $post ) {
		return '';
	}
	return get_post_meta( $post->ID, '_thumbnail_id', true );
}


Changelog

Changelog
Version Description
WP-4.4.0 $post can be a post ID or WP_Post object.
WP-2.9.0 Introduced.