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<?php class Observer { protected function callme() { } } class MyParent extends Observer { function createChild() { $this->callme(); // this is OK return new MyChild (function() { $this->callme(); }); } } class MyChild { private $gatewayFunction; public function __constructor (Closure $gatewayFunction) { $this->gatewayFunction = $gatewayFunction; } public function __destroy() { $this->gatewayFunction->__invoke(); } } $p = new MyParent(); $c = $p->createChild(); var_dump($c); $c->__destroy();
Output for git.master, git.master_jit, rfc.property-hooks
object(MyChild)#2 (1) { ["gatewayFunction":"MyChild":private]=> NULL } Fatal error: Uncaught Error: Call to a member function __invoke() on null in /in/LPUsJ:28 Stack trace: #0 /in/LPUsJ(35): MyChild->__destroy() #1 {main} thrown in /in/LPUsJ on line 28
Process exited with code 255.

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