quick sort php

1<?php
2function quick_sort($my_array)
3 {
4	$loe = $gt = array();
5	if(count($my_array) < 2)
6	{
7		return $my_array;
8	}
9	$pivot_key = key($my_array);
10	$pivot = array_shift($my_array);
11	foreach($my_array as $val)
12	{
13		if($val <= $pivot)
14		{
15			$loe[] = $val;
16		}elseif ($val > $pivot)
17		{
18			$gt[] = $val;
19		}
20	}
21	return array_merge(quick_sort($loe),array($pivot_key=>$pivot),quick_sort($gt));
22}
23