<?php define('MY_ORDER', [0 => 2, 1 => 3, 2 => 0, 8 => 1]); function keyfn($v) { echo "called for $v\n"; return MY_ORDER[$v]; } $array = [2, 2, 2, 1, 1, 0, 0, 8]; $new = []; foreach ($array as $v) { $new[] = $cache[$v] ??= keyfn($v); } array_multisort($new, $array); var_export($array);
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