Qiniu\Http\Client::userAgent PHP Method

    private static function userAgent()
    {
        $sdkInfo = "QiniuPHP/" . Config::SDK_VER;
        $systemInfo = php_uname("s");
        $machineInfo = php_uname("m");
        $envInfo = "({$systemInfo}/{$machineInfo})";
        $phpVer = phpversion();
        $ua = "{$sdkInfo} {$envInfo} PHP/{$phpVer}";
        return $ua;
    }