wp_get_post_parent_id( int|WP_Post|null $post = null )

Returns the ID of the post’s parent.

Parameters

$post

(Optional) Post ID or post object. Defaults to global $post.

Default value: null

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

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Changelog

Changelog
Version	Description
5.9.0	The `$post` parameter was made optional.
3.1.0	Introduced.