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wp_check_post_hierarchy_for_loops › WordPress Function

Since3.1.0
Deprecatedn/a
› wp_check_post_hierarchy_for_loops ( $post_parent, $post_id )
Parameters: (2)
  • (int) $post_parent ID of the parent for the post we're checking.
    Required: Yes
  • (int) $post_id ID of the post we're checking.
    Required: Yes
See:
Returns:
  • (int) The new post_parent for the post, 0 otherwise.
Defined at:
Codex:

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

Prevents loops from forming and breaks those that it finds. Attached to the {@see 'wp_insert_post_parent'} filter.


Related Functions: wp_check_term_hierarchy_for_loops, wp_find_hierarchy_loop, wp_check_post_lock, wp_check_comment_flood, wp_check_widget_editor_deps

Source 

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;
}