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<?php var_dump(change('shmest', change('test', create()))); function create() { return ['type' => 'smth', 'property' => 'smth too']; } function &change($prop, &$obj) { $obj['property'] = $prop; return $obj; }
Output for 7.0.0 - 7.1.0RC5
Notice: Only variables should be passed by reference in /in/bM6q3 on line 3 array(2) { ["type"]=> string(4) "smth" ["property"]=> string(6) "shmest" }
Output for hhvm-3.12.0
array(2) { ["type"]=> string(4) "smth" ["property"]=> string(6) "shmest" }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.0 - 5.6.21
Strict Standards: Only variables should be passed by reference in /in/bM6q3 on line 3 array(2) { ["type"]=> string(4) "smth" ["property"]=> string(6) "shmest" }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/bM6q3 on line 6
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/bM6q3 on line 6
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/bM6q3 on line 6
Process exited with code 255.