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<?php class B extends ArrayObject { } $a = new B(); $a['null'] = null; var_dump($a->offsetExists('null')); var_dump(isset($a['null'])); var_dump(array_key_exists('null', $a));
Output for git.master, git.master_jit, rfc.property-hooks
bool(true) bool(false) Fatal error: Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, B given in /in/iBUGX:7 Stack trace: #0 {main} thrown in /in/iBUGX on line 7
Process exited with code 255.

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