ements( $elements ) { $num = 0; $parent_field = $this->db_fields['parent']; foreach ( $elements as $e ) { if ( empty( $e->$parent_field ) ) { $num++; } } return $num; } /** * Unsets all the children for a given top level element. * * @since 2.7.0 * * @param object $element The top level element. * @param array $children_elements The children elements. */ public function unset_children( $element, &$children_elements ) { if ( ! $element || ! $children_elements ) { return; } $id_field = $this->db_fields['id']; $id = $element->$id_field; if ( ! empty( $children_elements[ $id ] ) && is_array( $children_elements[ $id ] ) ) { foreach ( (array) $children_elements[ $id ] as $child ) { $this->unset_children( $child, $children_elements ); } } unset( $children_elements[ $id ] ); } }