ThinkPHP 多图片上传

public function feedback(){
        $loginck = A('Index')->check();
        
        //模块
        $adminmodule = session('adminmodule');
        //权限
        $adminaccess = session('adminaccess');
        //管理员id
        $adminid = session('adminid');
        
        $userquestion = D('userquestion');
        if($_GET['id'])
        {
            $data = $userquestion->get_question($_GET['id']);
            //判断此用户是否存在问题   和   此用户是否已经解答问题
            if(!$data || $data['state'] == 1){
                $this->error('未获得此用户问题');exit;
            }
        }
        //提交反馈答案
        if($_POST)
        {
            
            if($_POST['answer'] == '' ){
                $this->error('未填写内容');exit;
            }
            
            //上传多文件
            $var = $_FILES['photo']['name'];
            //删除空着的图片
            $var = array_filter($var);
            //不够3张
            if(count($var)<3){
                $this->error('图片上传不够3张');exit;
            }
            import('ORG.Net.UploadFile');
            $upload = new \Org\Net\UploadFile();
            
            foreach ($_FILES as $key=>$file)
            {
                if(!empty($file['name']))
                {
                    $upload->allowExts  = array('jpg', 'gif', 'png','jpeg');
                    $upload->savePath =  './Public/uploads/user/'.$_POST['uid'].'/';        
                    $info =  $upload->uploadOne($file);
                    if(!$info)
                    { // 保存附件信息
                        $this->error($upload->getErrorMsg());die;
                    }
                }
            }
            $dir='./Public/uploads/user/'.$_POST['uid'].'/';
            $file=scandir($dir);
            $savename = $file[2].','.$file[3].','.$file[4].',';

            $save = array();
            $save['aid'] = $adminid;
            $save['state'] = 1;
            $save['answer'] = $_POST['answer'];
            $save['pic'] = $savename;
            $rs = $userquestion->add_answer($_POST['uid'],$save);
            if(!$rs){
                $this->error('反馈信息失败，请重试');exit;
            }
            //反馈成功修改用户表用户状态
            $customer = D('customer');
            $customer->updatastate($_POST['uid'],array('state'=>'6'));
            //修改申请表用户状态
            $claim = D('claim');
            $rs1 = $claim->save_claim($_POST['uid'],6);
            
            $this->success('反馈信息成功',U('Cadmin/user_confirmlist'));exit;
            
        }
        $this->assign('data',$data);
        $this->display('Cadmin/feedback');
    }