一、控制器上面要加

use QrCode;

calss里面是如下下法：

 $data = QrCode::size(100)->color(255,0,255)->backgroundColor(255,255,0)->generate($res['url']);
        $url = base64_encode($data);
        echo base64_decode($url);

二、

laravel 使用扩展包生成二维码

https://www.baidu.com/link?url=gl2I1TC6f4lBtBPrevAYShCNzfVsMVwsM6rPO4n_lwP9-3Xfck3vTPwKFYSWViF3&wd=&eqid=8433740500052b74000000065cbad925