3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $foo = array( 'a' => 1, 'b' => '1', 'c' => 1, '1' => '2', 1 => 2, ); function change_keys($array, $callback) { return array_combine(array_map($callback, array_combine(array_keys($array), array_keys($array))), $array); } var_dump(change_keys($foo, function($v) { return '#' . $v; }));
based on VmeV2
Output for 5.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(4) { ["#a"]=> int(1) ["#b"]=> string(1) "1" ["#c"]=> int(1) ["#1"]=> int(2) }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/qi8qn on line 12
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 T_FUNCTION in /in/qi8qn on line 12
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/qi8qn on line 12
Process exited with code 255.