Brand thumbnail modification

Model Layer Design

 public function _before_update(&$data,$option){
        if($_FILES['brand_logo']['tmp_name']){
            if($data['oldlogo']){
               if(file_exists($data['oldlogo'])){
                    @unlink($data['oldlogo']);
               }
            }

            $upload = new \Think\Upload();// 实例化上传类
            $upload->maxSize   =     3145728 ;// 设置附件上传大小
            $upload->exts      =     array('jpg', 'gif', 'png', 'jpeg');// 设置附件上传类型
            $upload->autoSub = false;
            $upload->savePath  =      './Public/Uploads/Brand/'; // 设置附件上传目录
            $upload->rootPath  =      './';
            $info   =   $upload->uploadOne($_FILES['brand_logo']);
            $logo=$info['savepath'].$info['savename'];
            $image = new \Think\Image();
            $image->open($logo);
            $image->thumb(100, 30)->save($logo);
            $data['brand_logo']=$logo;
        }
    }

Accept the pictures sent from the hidden domain. If the picture is not an old picture, then delete the previous picture and then upload it again.