3v4l.org

run code in 500+ PHP versions simultaneously
<?php $array = ['a' => 1, 'b' => 2, 0, 'f' => 4, '-f' => 5]; ksort($array); /** Array ( [-f] => 5 [0] => 0 [a] => 1 [b] => 2 [f] => 4 ) */ ?>
Output for 8.1.34, 8.2.0 - 8.2.31, 8.3.0 - 8.3.31, 8.4.1 - 8.4.22, 8.5.0 - 8.5.7

preferences:
50.15 ms | 857 KiB | 4 Q