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<?php interface PaymentGatewayInterface { public function pay(array $bill); public function processNotification($notification); } class Payment { protected $gateway; public function __construct(PaymentGatewayInteface $gateway) { $this->gateway = $gateway; } public function pay(array $bill) { return $this->gateway->pay($bill); } public function processNotification($notification) { return $this->gateway->processNotification($notification); } } class Paypal implements PaymentGatewayInterface { public function pay(array $bill) { } public function processNotification($notification) { } } $a = new Payment(new Paypal);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
Fatal error: Uncaught TypeError: Payment::__construct(): Argument #1 ($gateway) must be of type PaymentGatewayInteface, Paypal given, called in /in/UC65P on line 43 and defined in /in/UC65P:14 Stack trace: #0 /in/UC65P(43): Payment->__construct(Object(Paypal)) #1 {main} thrown in /in/UC65P on line 14
Process exited with code 255.
Output for 7.0.0 - 7.0.31, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Fatal error: Uncaught TypeError: Argument 1 passed to Payment::__construct() must be an instance of PaymentGatewayInteface, instance of Paypal given, called in /in/UC65P on line 43 and defined in /in/UC65P:14 Stack trace: #0 /in/UC65P(43): Payment->__construct(Object(Paypal)) #1 {main} thrown in /in/UC65P on line 14
Process exited with code 255.
Output for 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.30
Catchable fatal error: Argument 1 passed to Payment::__construct() must be an instance of PaymentGatewayInteface, instance of Paypal given, called in /in/UC65P on line 43 and defined in /in/UC65P on line 14
Process exited with code 255.
Output for 5.1.0 - 5.1.6
Fatal error: Class 'PaymentGatewayInteface' not found in /in/UC65P on line 14
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_ARRAY, expecting '&' or T_VARIABLE in /in/UC65P on line 5
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING in /in/UC65P on line 3
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 in /in/UC65P on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/UC65P on line 3
Process exited with code 255.

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