PHP简单实现冒泡排序的方法

<?php$files = array("file11.txt","file22.txt","file1.txt","file2.txt");function mySort($arr,$nat=false) {    for($i=0;$i<count($arr);$i++) {      for($j=0;$j<count($arr)-$i-1;$j++) {        if($nat) {          //按照strnatcmp()自然排序函数          if(strnatcmp($arr[$j], $arr[$j+1])>0) {            $tmp = $arr[$j];            $arr[$j] = $arr[$j+1];//从小到大排            $arr[$j+1] = $tmp;          }        } else {          //按照strcmp()自然排序函数          if(strcmp($arr[$j], $arr[$j+1])>0) {            $tmp = $arr[$j];            $arr[$j] = $arr[$j+1];//从小到大排            $arr[$j+1] = $tmp;          }        }      }    }    return $arr;}//Array ( [0] => file1.txt [1] => file11.txt [2] => file2.txt [3] => file22.txt )print_r(mySort($files,false));echo "<br/>";//2<11//Array ( [0] => file1.txt [1] => file2.txt [2] => file11.txt [3] => file22.txt )print_r(mySort($files,true));?>