3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $input = ["a", "b"]; function search($input) { $result = $input; foreach($input as $a) foreach($input as $b) $result []= $a . $b; array_walk($result, null); return array_unique($result); } echo json_encode(search($input));
Output for 5.4.0 - 5.6.28, 7.0.0 - 7.1.0
Warning: array_walk() expects parameter 2 to be a valid callback, no array or string given in /in/1SKcf on line 12 ["a","b","aa","ab","ba","bb"]
Output for hhvm-3.10.0 - 3.12.0
Warning: Invalid argument: function: not string, closure, or array in /in/1SKcf on line 12 ["a","b","aa","ab","ba","bb"]
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/1SKcf on line 3
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/1SKcf on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/1SKcf on line 3
Process exited with code 255.