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run code in 150+ php & hhvm versions
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<?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(); $k = '123'; var_dump($x[$k = '123']); var_dump($x[$k = '123'] = 4); var_dump(isset($x[$k = '123'])); unset($x[$k = '123']);
based on A1g1f
Output for 5.0.0 - 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 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting '{' in /in/r1UOj 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/r1UOj on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `'{'' in /in/r1UOj on line 2
Process exited with code 255.