php 递归数据，三维数组转换二维

 public function sortarea($area, $parent_id = 0, $lev = 1){
        static $list;
        foreach($area as $v){
            if($v[‘upid‘] == $parent_id){
                $v[‘lev‘] = $lev;
                $list[] = $v;
                $this->sortarea($area,$v[‘cid‘],$lev+1);
            }
        }
        return $list;
    }


   $newArr = array();
   foreach($Res as $key=>$val){
            foreach($val as $k=>$v){
                $newArr[] = $v;
            }
      }