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<?php abstract class EventManagerBase { abstract protected function attach(string $event); } final class EventManager extends EventManagerBase { protected function attach(string $event) { echo "attaching $event\n"; } } final class EventConfigurator extends EventManagerBase { private EventManagerBase $eventManager; public function __construct(EventManagerBase $eventManager, array $config) { $this->eventManager = $eventManager; foreach ($config as $event) { $this->attach($event); } } protected function attach(string $event) { $this->eventManager->attach($event); } } $eventManager = new EventManager(); $configurator = new EventConfigurator($eventManager, ['event1', 'event2']);
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.27, 8.3.0 - 8.3.15, 8.4.1 - 8.4.2
attaching event1 attaching event2
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33
Parse error: syntax error, unexpected 'EventManagerBase' (T_STRING), expecting function (T_FUNCTION) or const (T_CONST) in /in/k1e2l on line 18
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33
Parse error: syntax error, unexpected 'EventManagerBase' (T_STRING), expecting variable (T_VARIABLE) in /in/k1e2l on line 18
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected T_STRING, expecting T_VARIABLE in /in/k1e2l on line 18
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_STRING, expecting T_VARIABLE in /in/k1e2l on line 18
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_CLASS in /in/k1e2l on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_CLASS in /in/k1e2l on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/k1e2l on line 3
Process exited with code 255.
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157.05 ms | 415 KiB | 5 Q