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run code in 300+ PHP versions simultaneously
<?php class I extends ArrayIterator { public function current() { return parent::current(); } } $a = new ArrayObject([1, 2, 3], 0, I::class); foreach ($a as $key => &$value) { $value += 10; } unset($value); var_dump($a);
Output for 8.1.0 - 8.1.9
Deprecated: Return type of I::current() should either be compatible with ArrayIterator::current(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/00Z3F on line 5 Fatal error: Uncaught Error: An iterator cannot be used with foreach by reference in /in/00Z3F:12 Stack trace: #0 {main} thrown in /in/00Z3F on line 12
Process exited with code 255.
Output for 8.0.0 - 8.0.22
Fatal error: Uncaught Error: An iterator cannot be used with foreach by reference in /in/00Z3F:12 Stack trace: #0 {main} thrown in /in/00Z3F on line 12
Process exited with code 255.
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.30
Fatal error: Uncaught RuntimeException: An iterator cannot be used with foreach by reference in /in/00Z3F:12 Stack trace: #0 {main} thrown in /in/00Z3F on line 12
Process exited with code 255.
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33
Fatal error: An iterator cannot be used with foreach by reference in /in/00Z3F on line 12
Process exited with code 255.

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