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run code in 150+ php & hhvm versions
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<?php class Profile { private $active = false; public function activate() { $this->active = true; } public function isActive() { return $this->active; } } interface Event { function execute($object); } class ProfileWasActivated implements Event { public function execute($profile) { if(!($profile instanceof Profile)) { throw new \InvalidArgumentException('Only Profiles allowed!'); } $profile->activate(); } } class EventDomainObjectLoader { public static function load($object, array $events) { foreach($events as $event) { if(!($event instanceof Event)) { throw new \InvalidArgumentException('Only Events allowed!'); } $event->execute($object); } return $object; } } $profile = EventDomainObjectLoader::load(new Profile(), [new ProfileWasActivated()]); var_dump($profile->isActive());
based on cOmgN
Output for 5.4.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
bool(true)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/31XET on line 41
Process exited with code 255.
Output for 5.1.0 - 5.2.17
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/31XET on line 22 Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/31XET on line 33 Parse error: syntax error, unexpected '[' in /in/31XET on line 41
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/31XET on line 22 Parse error: parse error, unexpected T_ARRAY, expecting '&' or T_VARIABLE in /in/31XET on line 30
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/31XET on line 4
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, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/31XET on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/31XET on line 4
Process exited with code 255.