/**
* Shuffle with seed
* @param array $arr
* @param $seed
* @return array
*/
function shuffle($arr, $seed = -1)
{
if ($seed == -1) {
return $arr;
}
$mt = new MersenneTwister($seed);
$new = $arr;
for ($i = count($new) - 1; $i > 0; $i--) {
$j = $mt->getNext(0, $i);
$tmp = $new[$i];
$new[$i] = $new[$j];
$new[$j] = $tmp;
}
return $new;
}
