PHP類變量

Question

我知道有一些關於它的線程，但似乎沒有任何工作......我試圖在PHP中創建類似全局類變量的東西，因此理論上我想要類似這樣的東西：

（PseudoCode後面）：

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; 
} 

} 

我該怎麼做？順便說一句：

我使用Laravel順便說一句，我不能設置在構造函數中這個值，因爲我有它尚不可用......，如果這使事情更容易...

編輯： 確切的說，這是我的代碼：

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 = \App\User::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]); 
    } 

所以我做了支付寶付款。在函數payVoucher中，我從request獲得了憑證值（這是應該可以在其他函數中訪問的變量），然後在函數getDone中，我需要訪問它才能將其輸入到數據庫中。我怎樣才能做到這一點？

Answer 1

基於您的評論，第二種方法是重定向後調用。這是一個新的請求，並且當腳本完成時，您在腳本中設置的所有變量均不再存在，則您設置的屬性的原始對象將不再存在。

有幾種方法可以將值傳遞給新請求，如url中的查詢變量，會話變量或數據庫存儲。

使用會話或一些其他類型的服務器端存儲保留在服務器上的值，這就是我會建議：

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']); 
    ... 
} 

請注意，我假設一個會話已在已經啓動腳本的頂部。

Answer 2

嘗試這樣

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; 
} 

}