input代码

<input type="radio" value="weixin" checked="checked" class="weui_check" name="gateway" id="wxpay">

我如何 ID判断 使得控制器的参数不同

if ($request->isMethod('post')) {

if(!$request->input('stake', null)){
    return view('application.info', [
        'title' => '支付失敗',
        'icon' => 'warn',
        'content' => '参数提交不全'
    ]);
}

$orderNo = date("YmdHis").rand(10000,99999);
$payRequest = new PayRequest;
$payRequest->id_user = $user->id;
$payRequest->body_stake = $request->input('stake');
$payRequest->body_gateway = $request->input('gateway');
$payRequest->skl_order = $orderNo;
$payRequest->save();


$webApp=new \webApp();

$pay_memberid = "10104";   //商户ID
$pay_orderid = $orderNo;    //订单号
$pay_amount = $request->input('stake');    //交易金额
$pay_applydate = date("Y-m-d H:i:s");  //订单时间
$pay_bankcode = "xxxxxx";   //银行编码
$pay_notifyurl = "xxxxxxx";   //服务端返回地址
$pay_callbackurl = "xxxxxx";  //页面跳转返回地址
$Md5key = "xxxxxxx";   //密钥

$requestarray = array(
    "pay_memberid" => $pay_memberid,
    "pay_orderid" => $pay_orderid,
    "pay_amount" => $pay_amount,
    "pay_applydate" => $pay_applydate,
    "pay_bankcode" => $pay_bankcode,
    "pay_notifyurl" => $pay_notifyurl,
    "pay_callbackurl" => $pay_callbackurl
);

ksort($requestarray);
reset($requestarray);
$md5str = "";
foreach ($requestarray as $key => $val) {
    $md5str = $md5str . $key . "=>" . $val . "&";
}
$sign = strtoupper(md5($md5str . "key=" . $Md5key)); 
$requestarray["pay_md5sign"] = $sign;
$requestarray["tongdao"] = "xxxxx";

$url="xxxxxxxxx";

$result = $webApp->api($url,$requestarray);

//QRcode::png($result['data']['trade_qrcode']);

return view('application.accountPayRedirect', [
    'qrcode' => $result['data']['trade_qrcode'],
    'money' => $request->input('stake'),
    'gateway' =>$request->input('gateway')
]);

}

我需要 $pay_bankcode 跟$requestarray["tongdao"] 2个参数ID不同而不同

感谢 。如果可以 能帮我把应该写的代码写一下吗？