3v4l.org

run code in 500+ PHP versions simultaneously
<?php $one = array(4, 1, 2, 2, 3, 3, 1); $two = array(13, 12, 13, 12); print_r(array_udiff($one, $two, function($a, $b) { $ret = ($a % 10) - ($b % 10); echo "{$a} <=> {$b} == {$ret}\n"; return $ret; }));

preferences:
19.96 ms | 475 KiB | 4 Q