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wp_get_post_parent_id( int|WP_Post $post )

Returns the ID of the post’s parent.

Parameters

$post

(int|WP_Post) (Required) Post ID or post object. Defaults to global $post.

Return

(int|false) Post parent ID (which can be 0 if there is no parent), or false if the post does not exist.

Source

File: wp-includes/post.php 

function wp_get_post_parent_id( $post ) {
	$post = get_post( $post );
	if ( ! $post || is_wp_error( $post ) ) {
		return false;
	}
	return (int) $post->post_parent;
}

Uses

Uses Description
wp-includes/post.php: get_post()

Retrieves post data given a post ID or post object.
wp-includes/load.php: is_wp_error()

Check whether variable is a WordPress Error.

Changelog

Version Description
3.1.0 Introduced.

© 2003–2019 WordPress Foundation
Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/functions/wp_get_post_parent_id