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run code in 150+ php & hhvm versions
Bugs & Features
<?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)); var_dump(strtok(ReflectionClass::export("ShipOnlyAbstract", true), "\n")); var_dump(strtok(ReflectionClass::export("ShipWithInterface", true), "\n"));
based on PZASg
Output for 5.2.0 - 5.6.28, hhvm-3.12.0, 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" } string(87) "Class [ <user> class ShipOnlyAbstract extends AbstractShip implements ShipInterface ] {" string(88) "Class [ <user> class ShipWithInterface extends AbstractShip implements ShipInterface ] {"
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.1.6
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" } string(87) "Class [ <user> class ShipOnlyAbstract extends AbstractShip implements ShipInterface ] {" string(103) "Class [ <user> class ShipWithInterface extends AbstractShip implements ShipInterface, ShipInterface ] {"
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING in /in/QRCmg 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/QRCmg on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/QRCmg on line 3
Process exited with code 255.