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<?php interface ListenerAggregate {} class EM { public function attach(callable $listener){ if($listener instanceof ListenerAggregate){ // this is indeed an aggregate! echo "Attached aggregate"; }else{ echo "Attached regular callable"; } } } 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 git.master, git.master_jit, rfc.property-hooks
Attached regular callableAttached aggregate

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