php sort non ufo

sort.php

<?php
$c = [
    '6.9.3-1' => '10',
    '6.9.3-10' => '10',
    '6.9.3-2' => '10',
];

uksort($c, function ($a, $b) {
    $a = preg_split('/[^0-9]/', $a);
    $b = preg_split('/[^0-9]/', $b);
    if ($a == $b) return 0;
    return $a > $b ? -1 : 1;
});
var_dump($c);