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<?php version_compare(PHP_VERSION, '7.1', '<') && die; class MyClass extends ArrayIterator { public function __debugInfo() { return $this->storage; } } $x = new MyClass([1]); var_dump($x);
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: Return type of MyClass::__debugInfo() should either be compatible with ArrayIterator::__debugInfo(): array, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/PBdjk on line 5 Warning: Undefined property: MyClass::$storage in /in/PBdjk on line 7 object(MyClass)#1 (0) { }

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