3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $some_array = array (0 => 1, 'x'=> 1, 2 => 1, 'a'=> 1, 1 => 1, 'z'=> 1); ksort($some_array); echo(join("", array_keys($some_array)));
based on dBtmc
Output for 7.0.0 - 7.2.0
0axz12
Output for 5.3.21 - 5.6.21
az0x12