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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, $v) { echo "offsetSet: "; var_dump($k); } public function offsetExists($k) { echo "offsetExists: "; var_dump($k); } public function offsetUnset($k) { echo "offsetUnset: "; var_dump($k); } } $x = new C(); function id($k) { return $k; } var_dump($x[id('123')]); var_dump($x[id('123')] = 4); var_dump(isset($x[id('123')])); unset($x[id('123')]);
Output for 5.0.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
offsetGet: string(3) "123" NULL offsetSet: string(3) "123" int(4) offsetExists: string(3) "123" bool(false) offsetUnset: string(3) "123"
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/NSY4d 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/NSY4d on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `'{'' in /in/NSY4d on line 2
Process exited with code 255.