php batch operation data

//从分组中删除熊猫public function panda_del(){
 //var_dump($_POST);die;
     $panda=M('chain_panda');
         $where['id']=array('in',$_POST['panda_id']);
             $data['group_id']=0;
                 if($_POST){
                        $del=$panda->where($where)->save($data);
                        if($del){
                            $this->success('移除分组成功');
                    }else{
                             $this->error('移除分组失败');
                            }
                             }
                           echo '从分组中删除熊猫';
                           }