get_post_thumbnail_id() WP 1.0

Retrieve post thumbnail ID.

No Hooks.

Return

String/Int. Post thumbnail ID or empty string.

Usage

get_post_thumbnail_id( $post );

$post(int/WP_Post)

Post ID or WP_Post object.
Default: global $post

Code of get post thumbnail id: wp-includes/post-thumbnail-template.php ^{WP 5.2.1}

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

Related Functions

From tag: Thumbnail (images)

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