php递归获取顶级父类id

获取顶级父类id<pre name="code" class="php">/** * 获取顶级父类id * @param  [type] $id [description] * @return [type]     [description] */function get_top_parentid($id){$r = M('Category')->where('id = '.$id)->field('id,parentid')->find();if($r['parentid'] != '0') return get_top_parentid($r['parentid']);return $r['id'];}