3v4l.org

run code in 300+ PHP versions simultaneously
<?php define('MY_ORDER', [0 => 2, 1 => 3, 2 => 0, 8 => 1]); $array = [2, 2, 2, 1, 1, 0, 0, 8]; usort($array, function ($a, $b) { static $cache; return ($cache[$a] ??= keyfn($a)) <=> ($cache[$b] ??= keyfn($b)); }); var_export($array); function keyfn($v) { echo "called for $v\n"; return MY_ORDER[$v]; }
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
called for 2 called for 1 called for 0 called for 8 array ( 0 => 2, 1 => 2, 2 => 2, 3 => 8, 4 => 0, 5 => 0, 6 => 1, 7 => 1, )

preferences:
146.86 ms | 402 KiB | 117 Q