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run code in 150+ php & hhvm versions
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<?php class Param extends ArrayObject { public function offsetGet($name) { //if (!$this->offsetExists($name)) return null; return parent::offsetGet($name); } } $data = new Param(array('foo' => 12)); var_dump($data['bar'], $data['foo']);
Output for 5.4.20 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Notice: Undefined index: bar in /in/I5dl1 on line 9 NULL int(12)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.8 - 5.4.19
Notice: Undefined index: bar in /in/EqGSO on line 9 NULL int(12)
Output for 5.0.4 - 5.3.27, 5.4.0 - 5.4.7
Notice: Undefined index: bar in /in/EqGSO on line 9 NULL int(12)
Output for 5.3.28 - 5.3.29
Notice: Undefined index: bar in /in/I5dl1 on line 9 NULL int(12)
Output for 5.0.0 - 5.0.3
Notice: Undefined index: bar in /in/EqGSO on line 14 NULL int(12)
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/EqGSO on line 5
Process exited with code 255.
Output for 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/EqGSO on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/EqGSO on line 5
Process exited with code 255.
Output for 4.3.0
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/I5dl1 on line 5
Process exited with code 255.