Walker::unset_children( object $e, array $children_elements )

	public function unset_children( $e, &$children_elements ){
		if ( ! $e || ! $children_elements ) {
			return;
		}

		$id_field = $this->db_fields['id'];
		$id = $e->$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 ] );
	}