wp_check_post_hierarchy_for_loops() │ WP 3.1.0

Checks the given subset of the post hierarchy for hierarchy loops.

Prevents loops from forming and breaks those that it finds. Attached to the wp_insert_post_parent filter.

No Hooks.

Returns

Int. The new post_parent for the post, 0 otherwise.

Usage

wp_check_post_hierarchy_for_loops( $post_parent, $post_id );

$post_parent(int) (required)

ID of the parent for the post we're checking.

$post_id(int) (required)

ID of the post we're checking.

Notes

• See: wp_find_hierarchy_loop()

Changelog

wp_check_post_hierarchy_for_loops() wp check post hierarchy for loops code ^{WP 6.9.1}

function wp_check_post_hierarchy_for_loops( $post_parent, $post_id ) {
	// Nothing fancy here - bail.
	if ( ! $post_parent ) {
		return 0;
	}

	// New post can't cause a loop.
	if ( ! $post_id ) {
		return $post_parent;
	}

	// Can't be its own parent.
	if ( $post_parent === $post_id ) {
		return 0;
	}

	// Now look for larger loops.
	$loop = wp_find_hierarchy_loop( 'wp_get_post_parent_id', $post_id, $post_parent );
	if ( ! $loop ) {
		return $post_parent; // No loop.
	}

	// Setting $post_parent to the given value causes a loop.
	if ( isset( $loop[ $post_id ] ) ) {
		return 0;
	}

	// There's a loop, but it doesn't contain $post_id. Break the loop.
	foreach ( array_keys( $loop ) as $loop_member ) {
		wp_update_post(
			array(
				'ID'          => $loop_member,
				'post_parent' => 0,
			)
		);
	}

	return $post_parent;
}