public function downimg()
    {
        $path = 'E:/phpstudy_pro/WWW/pachong/public/uploads/img/';
                
        $img ="https://zy.yaozh.com/instruct/imagesout/TB1_wMKSpXXXXalXXXXXXXXXXXX_!!0-item_pic.jpg_430x430q90.jpg" ;
        ob_clean();
        ob_start();
        readfile($img);     //读取图片
        $img = ob_get_contents();   //得到缓冲区中保存的图片
        ob_end_clean();     //清空缓冲区
        $fp = fopen($path.'test.jpg','w');  //写入图片
        if(fwrite($fp,$img))
        {
            fclose($fp);
            echo "图片保存成功";
        }else{

            echo "图片保存失败";
        }
    }