PHP Class Variable

Question

我知道已经有一些线程，但似乎没有用...那：

（伪代码如下）：

class GlobalVarClass{
globalVar $price;
function doSomethingWithThePrice(){
    //get some Values, etc..
    $this->price = $xyz;
}
function needThePriceNow(){
    //this is where the price is needed now, so something like
    echo $this->price;
}
}

我该怎么做？顺便说一句：我无法在构造函数中设置此值，因为我还没有它。...

我正在使用laravel btw。

编辑：确切地说，这是我拥有的代码：

class VoucherController extends Controller
{
    private $_apiContext;
    protected $voucherValue;
    public function __construct()
    {
        $this->_apiContext = PayPal::ApiContext(
            config('services.paypal.client_id'),
            config('services.paypal.secret'));
        $this->_apiContext->setConfig(array(
            'mode' => 'sandbox',
            'service.EndPoint' => 'https://api.sandbox.paypal.com',
            'http.ConnectionTimeOut' => 30,
            'log.LogEnabled' => true,
            'log.FileName' => storage_path('logs/paypal.log'),
            'log.LogLevel' => 'FINE'
        ));
    }
    public function index(){
        return view('voucher.createVoucher');
    }
    public function payVoucher(Request $request){
        $userInfo = AppUser::where('id','=',Auth::user()->id)
            ->first();
        if($userInfo->street == ""){
            $request->session()->flash('alert-info', 'Vor der ersten Bestellung müssen Sie erst Ihre Daten vervollständigen');
            return redirect('/editData');
        }
        $itemList = PayPal::itemList();
        $payPalItem = PayPal::item();
        $payPalItem->setName('Gutschein')->setDescription('Gutschein für Shopping Portal')->setCurrency('EUR')->setQuantity(1)->setPrice($request->input('voucherValue'));
        $total = $request->input('voucherValue');
        $this->voucherValue = $total;
        $itemList->addItem($payPalItem);
        $payer = PayPal::Payer();
        $payer->setPaymentMethod('paypal');
        $details = PayPal::details();
        $details->setShipping("0")
            ->setSubtotal($total);
        $amount = PayPal:: Amount();
        $amount->setCurrency('EUR');
        $amount->setTotal(($total));
        $amount->setDetails($details);
        $transaction = PayPal::Transaction();
        $transaction->setAmount($amount);
        $transaction->setItemList($itemList);
        $transaction->setDescription('Ihr Gutschein');
        $redirectUrls = PayPal:: RedirectUrls();
        $redirectUrls->setReturnUrl(action('VoucherController@getDone'));
        $redirectUrls->setCancelUrl(action('VoucherController@getCancel'));
        $payment = PayPal::Payment();
        $payment->setIntent('sale');
        $payment->setPayer($payer);
        $payment->setRedirectUrls($redirectUrls);
        $payment->setTransactions(array($transaction));
        $response = $payment->create($this->_apiContext);
        $redirectUrl = $response->links[1]->href;
        return Redirect::to($redirectUrl);
    }

    public function getDone(Request $request)
    {
        $id = $request->get('paymentId');
        $token = $request->get('token');
        $payer_id = $request->get('PayerID');
        $payment = PayPal::getById($id, $this->_apiContext);
        $paymentExecution = PayPal::PaymentExecution();
        $paymentExecution->setPayerId($payer_id);
        $executePayment = $payment->execute($paymentExecution, $this->_apiContext);
        // Clear the shopping cart, write to database, send notifications, etc.
        // Thank the user for the purchase
        //Gutscheincode generieren, in DB eintragen, und per Mail verschicken
        $voucherCode = substr(base_convert(sha1(uniqid(mt_rand())), 16, 36), 0, 12);
        $voucher = new Voucher;
        $voucher->voucherValue = $this->voucherValue;
        $voucher->voucherCode = $voucherCode;
        $voucher->save();
        return view('voucher.buyDone', ['voucherCode' => $voucherCode, 'payment' => $payment]);
    }

所以我正在进行贝宝付款。在函数payVoucher中，我从 request中获得了凭证（应该在其他函数中可以访问的变量），然后在函数getDone中，我需要访问它以将其输入到DB中。我该怎么做？

Answer 1

基于您的评论，第二种方法是在重定向后调用的。这是一个新请求，随着您在脚本中设置的所有变量在脚本完成后不再存在，您设置的属性将不再存在。

有几种方法可以将值传递给新请求，例如URL中的查询变量，会话变量或例如数据库存储。

使用会话或其他类型的服务器端存储保持服务器上的值，因此我建议这样做：

public function payVoucher(Request $request){
    ...
    $_SESSION['PayPal']['voucherValue'] = $total;
    ...
}

public function getDone(Request $request)
{
    ...
    $voucher->voucherValue = $_SESSION['PayPal']['voucherValue'];
    // You need to delete it?
    unset($_SESSION['PayPal']['voucherValue']);
    ...
}

请注意，我假设已经在脚本的顶部开始了会话。

Answer 2

尝试像这样

protected $price;

Answer 3

class GlobalVarClass{
public $price;
public function __construct(){
   $this->price = 123;
}

function needThePriceNow(){
    //this is where the price is needed now, so something like
    echo $this->price; //This will give 123;
}
}