3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $foo = [ 'a' => '1', 'b' => '1', 'c' => '2', ]; $foo2 = array_combine($foo, $foo); var_dump($foo2); $foo3 = array_map(function($v) { return '#' . $v; }, $foo2); var_dump($foo3); $foo4 = array_fill_keys($foo3, $foo); var_dump($foo4);
based on 58riZ
Output for 5.4.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(2) { [1]=> string(1) "1" [2]=> string(1) "2" } array(2) { [1]=> string(2) "#1" [2]=> string(2) "#2" } array(2) { ["#1"]=> array(3) { ["a"]=> string(1) "1" ["b"]=> string(1) "1" ["c"]=> string(1) "2" } ["#2"]=> array(3) { ["a"]=> string(1) "1" ["b"]=> string(1) "1" ["c"]=> string(1) "2" } }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/Nkdl2 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/Nkdl2 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/Nkdl2 on line 3
Process exited with code 255.