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<?php $a = array('foo' => "xyz", null => "abc"); var_dump(isset($a[null])); var_dump(isset($a['foo'])); var_dump(array_key_exists($a, null));
Output for git.master, git.master_jit, rfc.property-hooks
bool(true) bool(true) Fatal error: Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, null given in /in/P7VFV:7 Stack trace: #0 {main} thrown in /in/P7VFV on line 7
Process exited with code 255.

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