php冒泡排序

<?php
function mysort($arr){
    for ($i=0;$i<count($arr);$i++){
        for ($j=0;$j<count($arr)-1;$j++){
            if($arr[$j]>$arr[$j+1]){
                $tmp = $arr[$j];
                $arr[$j] = $arr[$j+1];
                $arr[$j+1] = $tmp;
            }
        }
    }
    return $arr;
}
$arr = array(6,9,4,7,1,8,3);
print_r(mysort($arr));

?>