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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->getInterfaceNames()); var_dump($refShipWithInterface->getInterfaceNames()); var_dump($refShipOnlyAbstract->implementsInterface("ShipInterface ")); var_dump($refShipWithInterface->implementsInterface("ShipInterface "));
based on M6d10
Output for 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" } array(1) { [0]=> string(13) "ShipInterface" } array(1) { [0]=> string(13) "ShipInterface" } Fatal error: Uncaught ReflectionException: Interface ShipInterface does not exist in /in/CuH2k:33 Stack trace: #0 /in/CuH2k(33): ReflectionClass->implementsInterface('ShipInterface ') #1 {main} thrown in /in/CuH2k on line 33
Process exited with code 255.
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" } array(1) { [0]=> string(13) "ShipInterface" } array(1) { [0]=> string(13) "ShipInterface" } Fatal error: Uncaught exception 'ReflectionException' with message 'Interface ShipInterface does not exist' in /in/CuH2k:33 Stack trace: #0 /in/CuH2k(33): ReflectionClass->implementsInterface() #1 {main}
Process exited with code 255.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.2.0 - 5.6.28
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" } array(1) { [0]=> string(13) "ShipInterface" } array(1) { [0]=> string(13) "ShipInterface" } Fatal error: Uncaught exception 'ReflectionException' with message 'Interface ShipInterface does not exist' in /in/CuH2k:33 Stack trace: #0 /in/CuH2k(33): ReflectionClass->implementsInterface('ShipInterface ') #1 {main} thrown in /in/CuH2k on line 33
Process exited with code 255.
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" } Fatal error: Call to undefined method ReflectionClass::getInterfaceNames() in /in/CuH2k on line 30
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING in /in/CuH2k 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/CuH2k on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/CuH2k on line 3
Process exited with code 255.