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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', $a));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
bool(true) bool(false) Fatal error: Uncaught TypeError: array_key_exists(): Argument #2 ($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.
Output for 7.4.0 - 7.4.33
bool(true) bool(false) Deprecated: array_key_exists(): Using array_key_exists() on objects is deprecated. Use isset() or property_exists() instead in /in/iBUGX on line 7 bool(true)
Output for 5.3.11 - 5.3.29, 5.4.1 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
bool(true) bool(false) bool(true)
Output for 5.0.0 - 5.0.5, 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) bool(true)
Output for 5.2.1
bool(false) bool(true) bool(true)
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.9
Fatal error: Class b: Cannot inherit from undefined class arrayobject in /in/iBUGX on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Class b: Cannot inherit from undefined class arrayobject in /in/iBUGX on line 2

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