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@ 2015-02-20T07:55:29Z

<?php

class  BankTransfer {}
class  CreditCard {}

class Payment {
    
    private $creditCard;
    private $banTransfer;
    
    private function __construct(BankTransfer $bankTransfer = null, CreditCard $creditCard = null) {
        $this->bankTransfer = $bankTransfer;
        $this->creditCard = $creditCard;
    }
    
    public static function byCreditCard(CreditCard $creditCard) {
        $ccPayment = new self();
        $ccPayment->creditCard = $creditCard;
        
        return $ccPayment;
    }
    
    public static function byBankTransfer(BankTransfer $bankTransfer) {
        return new self($bankTransfer, null);
    }
    
    public function isCreditCard() {
        return isset($this->creditCard);
    }
     
    public function isBankTransfer() {
        return isset($this->bankTransfer);
    }   
    
    public function getBankTransfer() {
        if ($this->isBankTransfer()) {
            return $this->bankTransfer;
        }
        
        throw new \Exception();
    }
    
    public function getCreditCard() {
        if ($this->isCreditCard()) {
            return $this->creditCard;
        }
        
        throw new \Exception();
    }
}


class Booking {
    private $payment;
    public function __construct(Payment $payment) {
        $this->payment = $payment;
    }
    
    public function getPayment() {
        return $this->payment;
    }
}

//$payment = Payment::byBankTransfer(new BankTransfer());
$payment = Payment::byCreditCard(new CreditCard());

$booking = new Booking($payment);

if ($booking->getPayment()->isCreditCard()) {
    echo 'credit card';
}

if ($booking->getPayment()->isBankTransfer()) {
    echo 'bank transfer';
}

Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Deprecated: Creation of dynamic property Payment::$bankTransfer is deprecated in /in/iDq7G on line 12 credit card
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28: credit card
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17: Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/iDq7G on line 40 Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/iDq7G on line 48 credit card
Output for 5.0.0 - 5.0.5: Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/iDq7G on line 40 Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/iDq7G on line 48 Fatal error: Argument 1 must not be null in /in/iDq7G on line 11
Process exited with code 255.
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/iDq7G on line 8
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1: Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/iDq7G on line 8
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/iDq7G on line 8
Process exited with code 255.

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