<?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