3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array(0 => 'a', 'str' => 'b'); $b = array('str' => 'b', 0 => 'a'); ksort($a); ksort($b); $c = array(0, 'str'); $d = array('str', 0); sort($c); sort($d); print_r($a); echo "\n"; print_r($b); echo "\n"; print_r($c); echo "\n"; print_r($d);

preferences:
36.64 ms | 402 KiB | 5 Q