fisher yates usage

<?php
/*
Answer to: http://stackoverflow.com/a/6557893/98057

Tested with PHP 5.4.13
*/
function fisherYatesShuffle(&$items, $seed=null)
{
    if ($seed !== null) {
        @mt_srand($seed);
    }
    for ($i = count($items) - 1; $i > 0; $i--)
    {
        $j = @mt_rand(0, $i);
        $tmp = $items[$i];
        $items[$i] = $items[$j];
        $items[$j] = $tmp;
    }
}

$arr = [0, 1,2,3,4,5,6,7,8,9];
fisherYatesShuffle($arr, 0);
print_r($arr);
/* will print:
Array
(
    [0] => 6
    [1] => 0
    [2] => 7
    [3] => 2
    [4] => 9
    [5] => 3
    [6] => 1
    [7] => 8
    [8] => 5
    [9] => 4
)
*/