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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 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 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 - 8.3.4, 8.3.6
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.
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 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.
Output for 5.6.0 - 5.6.40
object(MyChild)#2 (1) { ["gatewayFunction":"MyChild":private]=> NULL } Fatal error: Call to a member function __invoke() on null in /in/LPUsJ on line 28
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38
object(MyChild)#2 (1) { ["gatewayFunction":"MyChild":private]=> NULL } Fatal error: Call to a member function __invoke() on a non-object in /in/LPUsJ on line 28
Process exited with code 255.

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