冒泡排序的PHP实现

<?php
function BubbleSort($str)
{
for ($i=0;$i<count($str);$i++)
{    
    for ($j=count($str)-2;$j>=$i;$j--)
    {
            if($str[$j+1]<$str[$j])
            {   
                $tmp = $str[$j+1];
                
                $str[$j+1]=$str[$j];
                $str[$j]=$tmp;
            }

    }

}
return $str;
}
$str = array(3,6,1,5,9,0,4,6,11);
print_r(BubbleSort($str));
?>