1 
      2 
     1,'name'=>'安徽','pid'=>'0'), 5     array('id'=>2,'name'=>'北京','pid'=>'0'), 6     array('id'=>3,'name'=>'山东','pid'=>'0'), 7     array('id'=>4,'name'=>'昭阳区','pid'=>'2'), 8     array('id'=>5,'name'=>'合肥市','pid'=>'1'), 9     array('id'=>6,'name'=>'蜀山区','pid'=>'5'),10     array('id'=>7,'name'=>'烟台市','pid'=>'3'),11     );12 /**13  * @param $data array14  * @param $pid parent_id15  * @param $level16  * @author tian17  */18 function tree($data,$pid=0,$level=1){19     static $arr=array();20     foreach($data as $v){21         if($v['pid']==$pid){22             $v['level']=$level;23             $arr[]=$v;24             tree($data,$v['id'],$level+1);25         }26     }27 return $arr;28 }29 30 $list=tree($tree,0,1);31 var_dump($list);32  ?>