easyui递归下拉树

 /***** 部门选择下拉框字典2 *****/
 function buMen2(){
     $department =M('department');//部门表
       $org_code =$this->organization_code;
     $where['org_code'] = $org_code;
     
     $data = $department->where($where)->select();

     $res = $this->bumenTree2($department,0);
       dump($res);die;
       
       $res = json_encode($res);
       return $res; 
     
 } 


function bumenTree2($db,$dep_poid=0){
     
     $where['org_code']=1000;
     $where['dep_poid']= $dep_poid;
     
    $data=$db->where($where)->select();
//  dump($data);
//  die;
    $all=array(); 
     foreach($data as $k=>$v)
     {
         $all[$k]['id']=$v['dep_oid'];
         $all[$k]['text']=$v['dep_name'];
         $whe['dep_poid']=$v['dep_oid'];
         $res=$db->where($whe)->count();
         if($res>0)
         {
            $all[$k]['children']=$this->bumenTree2($db,$v['dep_oid']);
         }
     } 
     return $all;
     
 }