thinkphp3.2.3----图片上传并生成缩率图

 public function uploadify(){
     if(!IS_POST){
         $this->error('非法！');
     }
     $upload = $this->_upload();
 }

 protected function _upload(){
     $obj = new \Think\Upload();
     $obj->exts = array('jpg', 'gif', 'png', 'jpeg');// 设置附件上传类型
     $obj->rootPath = './data/upload/';    //upload类、image类的./入口目录
     $obj->savePath = 'face/';
     $obj->saveRule = 'uniqid';
     $obj->uploadReplace = true;
     $obj->autoSub = true;
     $obj->subType = 'date';
     $obj->dateFormat = 'Y_m';
     $info = $obj->upload();
     $userinfo = $this->users_model->where(array('id' => $this->userid))->find();
     if(!$info) {// 上传错误提示错误信息
         $this->error($obj->getError());
     }else{// 上传成功
         $face = './data/upload/'.$info['face']['savepath'].$info['face']['savename'];
         // 生成缩略图128*128；
         $image = new \Think\Image();
         $image->open($face);
         // 按照原图的比例生成一个最大为150*150的缩略图并保存为thumb.jpg
         $image->thumb(128, 128)->save($face);
       M('users')->where(array('id' => $this->userid))->save(array('avatar' => $info['face']['savepath'].$info['face']['savename']));
       if($userinfo['avatar']){
            @unlink('./data/upload/'.$userinfo['avatar']);//删除旧图
       }
       redirect(U('user/profile/upload_face'));
     }
 }