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get_post_thumbnail_id() WP 1.0

Retrieve post thumbnail ID.

Since 4.4.0 $post can be a post ID or WP_Post object.

Is the basis for: get_the_post_thumbnail(), has_post_thumbnail(), get_the_post_thumbnail_url()

Works based on: get_post_meta()

✈ 1 time = 0.00126s = very slow | 50000 times = 0.28s = very fast PHP 7.1.5, WP 4.8.1

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` ^{VER 4.9.8}

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

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