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<?php $a = new ArrayObject(); $a['null'] = null; var_dump($a->offsetExists('null')); var_dump(isset($a['null'])); var_dump(array_key_exists('null', $a));
Output for 5.3.11 - 5.3.29, 5.4.1 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
bool(true) bool(false) bool(true)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.2.0, 5.2.2 - 5.3.10, 5.4.0
bool(true) bool(true) bool(true)
Output for 5.2.1
bool(false) bool(true) bool(true)
Output for 4.3.2 - 4.4.9
Fatal error: Cannot instantiate non-existent class: arrayobject in /in/cjchh on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Cannot instantiate non-existent class: arrayobject in /in/cjchh on line 2