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run code in 150+ php & hhvm versions
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<?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($shipWithInterface instanceof ShipInterface); var_dump(class_implements($shipOnlyAbstract)); var_dump(class_implements($shipWithInterface)); var_dump(class_parents($shipOnlyAbstract)); var_dump(class_parents($shipWithInterface)); $refShipOnlyAbstract = new ReflectionClass("ShipOnlyAbstract"); $refShipWithInterface = new ReflectionClass("ShipWithInterface"); var_dump($refShipOnlyAbstract); var_dump($refShipWithInterface);
based on eDMhN
Output for 5.0.0 - 5.6.28, 7.0.0 - 7.1.0
bool(true) bool(true) bool(true) bool(true) array(1) { ["ShipInterface"]=> string(13) "ShipInterface" } array(1) { ["ShipInterface"]=> string(13) "ShipInterface" } array(1) { ["AbstractShip"]=> string(12) "AbstractShip" } array(1) { ["AbstractShip"]=> string(12) "AbstractShip" } object(ReflectionClass)#3 (1) { ["name"]=> string(16) "ShipOnlyAbstract" } object(ReflectionClass)#4 (1) { ["name"]=> string(17) "ShipWithInterface" }
Output for hhvm-3.12.0
bool(true) bool(true) bool(true) bool(true) array(1) { ["ShipInterface"]=> string(13) "ShipInterface" } array(1) { ["ShipInterface"]=> string(13) "ShipInterface" } array(1) { ["AbstractShip"]=> string(12) "AbstractShip" } array(1) { ["AbstractShip"]=> string(12) "AbstractShip" } object(ReflectionClass)#3 (2) { ["name"]=> string(16) "ShipOnlyAbstract" ["obj":"ReflectionClass":private]=> NULL } object(ReflectionClass)#4 (2) { ["name"]=> string(17) "ShipWithInterface" ["obj":"ReflectionClass":private]=> NULL }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING in /in/igIq7 on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING in /in/igIq7 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/igIq7 on line 3
Process exited with code 255.