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<?php class A{ public $null = null; } $a = new A; var_dump(isset($a->null)); var_dump(array_key_exists((string) null, $a));
Output for git.master, git.master_jit, rfc.property-hooks
bool(false) Fatal error: Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, A given in /in/iiMtJ:8 Stack trace: #0 {main} thrown in /in/iiMtJ on line 8
Process exited with code 255.

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