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<?php $a = new ArrayObject(array(), 1); $a['null'] = null; var_dump($a->offsetExists('null')); var_dump(isset($a['null']));
Output for 5.3.11 - 5.3.29, 5.4.1 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
bool(true) bool(false)
Output for 5.1.0 - 5.1.6, 5.2.0, 5.2.2 - 5.2.17, 5.3.0 - 5.3.10, 5.4.0
bool(true) bool(true)
Output for 5.2.1
bool(false) bool(true)
Output for 5.0.4 - 5.0.5

Process exited with code 139.
Output for 5.0.0 - 5.0.3
Warning: Wrong parameter count for __construct() in /in/aYAMk on line 2 bool(true) bool(true)
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.9
Fatal error: Cannot instantiate non-existent class: arrayobject in /in/aYAMk 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/aYAMk on line 2

preferences:
255.81 ms | 401 KiB | 329 Q