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<?php interface ListenerAggregate {} class EM { public function attach(callable $listener) { if($listener instanceof ListenerAggregate){ echo "Attached an aggregate\n"; }else{ echo "Attached regular callable\n"; } } } class SomeAggregateListener implements ListenerAggregate { public function __invoke() { // look ma, I'm a callable! } } $em = new EM; $em->attach(function(){}); $aggregate = new SomeAggregateListener; $em->attach($aggregate);
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.5 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Attached regular callable Attached an aggregate
Output for 5.3.0 - 5.3.29
Catchable fatal error: Argument 1 passed to EM::attach() must be an instance of callable, instance of Closure given, called in /in/UCsG3 on line 23 and defined in /in/UCsG3 on line 5
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION, expecting ')' in /in/UCsG3 on line 23
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION, expecting ')' in /in/UCsG3 on line 23
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING in /in/UCsG3 on line 2
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_STRING in /in/UCsG3 on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/UCsG3 on line 2
Process exited with code 255.
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