function mytest($value, $param = [], $data = [], $field = []) {
        $html = '<img src="'.dr_qrcode($data['url']).'">';
        return $html; // 输出二维码
    }

function mytest($value, $param = [], $data = [], $field = []) {
$img = dr_qrcode($data['url']);
        $html = '<a href="'.dr_down_file(urlencode($img)).'"><img src="'.$img.'"></a>';
        return $html; // 输出二维码
    }

Not Found

The requested URL /uploadfile/http://ewm/index.php?s=api&c=api&m=qrcode&thumb=&text=%2Findex.php%3Fc%3Dshow%26id%3D24&size=5&level=H was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

dr_down_file(($img))