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<?php interface ListenerAggregate {} class EM { public function attach($listener) { if($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; $aggregate = new SomeAggregateListener; $em->attach($aggregate);
Output for git.master_jit, git.master, rfc.property-hooks
Attached an aggregate

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