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<?php class A{} class B{} class CustomList extends ArrayObject{ protected $validType = 'A'; public function offsetSet($index, $val) { if(! $val instanceof $this->validType) { throw new \Exception('Cannot add item object of class '.get_class($val)); } } } $list = new CustomList(); $a = new A(); $b = new B(); $list[] = $a; $list[] = $b;
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: Return type of CustomList::offsetSet($index, $val) should either be compatible with ArrayObject::offsetSet(mixed $key, mixed $value): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/P7J2N on line 9 Fatal error: Uncaught Exception: Cannot add item object of class B in /in/P7J2N:11 Stack trace: #0 /in/P7J2N(20): CustomList->offsetSet(NULL, Object(B)) #1 {main} thrown in /in/P7J2N on line 11
Process exited with code 255.

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