get_post_thumbnail_id( int|WP_Post $post = null )

Retrieves the post thumbnail ID.


Parameters

$post

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

Default value: null


Return

(int|false) Post thumbnail ID (which can be 0 if the thumbnail is not set), or false if the post does not exist.


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
5.5.0 The return value for a non-existing post was changed to false instead of an empty string.
4.4.0 $post can be a post ID or WP_Post object.
2.9.0 Introduced.