Online PHP editor | refs for qZsVM

<?php interface ShipInterface {} abstract class AbstractShip implements ShipInterface {} class ShipOnlyAbstract extends AbstractShip {} class ShipWithInterface extends AbstractShip implements ShipInterface {} $shipOnlyAbstract = new ShipOnlyAbstract(); $shipWithInterface = new ShipWithInterface(); var_dump($shipOnlyAbstract instanceof AbstractShip); var_dump($shipWithInterface instanceof AbstractShip); var_dump($shipOnlyAbstract instanceof ShipInterface ); var_dump($shipWithInterface instanceof ShipInterface );