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run code in 150+ php & hhvm versions
Bugs & Features
<?php class C implements ArrayAccess { public function offsetGet($k) { echo "offsetGet: "; var_dump($k); } public function offsetSet($k, $v) {} public function offsetExists($k) { echo "offsetExists: "; var_dump($k); } public function offsetUnset($k) {} } $x = new C(); var_dump($x['123']); var_dump(isset($x['123']));
Output for 5.4.0 - 5.6.28, 7.0.0 - 7.1.0
offsetGet: int(123) NULL offsetExists: int(123) bool(false)
Output for 5.0.0 - 5.3.29, hhvm-3.12.0
offsetGet: string(3) "123" NULL offsetExists: string(3) "123" bool(false)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting '{' in /in/bC4tX on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting '{' in /in/bC4tX on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `'{'' in /in/bC4tX on line 2
Process exited with code 255.