php冒泡排序解决思路

php冒泡排序
搜索了哈php冒泡排序，网上写的不知道第二层循环都是递减的，很不符合我的习惯，既然是冒泡肯定是从下往上啊，所以索性自己写了个分享哈！

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<br />
<?php<br />
  $ar = array(1,3,2,8,3,5,6,10,13,27,24);<br />
bubble_sort($ar);<br />
print_r($ar);<br />
 function bubble_sort(&$ar)<br />
{<br />
   $ar_count = count($ar);<br />
   $temp = null;<br />
   for($i= 0 ; $i < $ar_count; $i ++)<br />
   {<br />
      for($j = 0 ; $j < $ar_count - $i - 1; $j++)<br />
      {<br />
          if($ar[$j] > $ar[$j+1])<br />
          {<br />
              $temp = $ar[$j];<br />
              $ar[$j] = $ar[$j+1];<br />
              $ar[$j+1] = $temp;<br />
          }<br />
      }<br />
   }<br />
}<br />

php 冒泡排序
------解决方案--------------------

$ar = array(24,1,3,2,8,3,5,6,10,13,27);<br />
bubble_sort($ar);<br />
<br />
function bubble_sort(&$ar)<br />
{<br />
   $ar_count = count($ar);<br />
   $temp = null;<br />
   for($i= 0 ; $i < $ar_count; $i ++)<br />
   {<br />
      for($j = 0 ; $j < $ar_count - $i - 1; $j++)<br />
      {<br />
          if($ar[$j] > $ar[$j+1])<br />
          {<br />
              $temp = $ar[$j];<br />
              $ar[$j] = $ar[$j+1];<br />
              $ar[$j+1] = $temp;<br />
          }<br />
      }<br />
echo join(',', $ar), PHP_EOL; //观察这里的输出<br />
   }<br />
}

1,3,2,8,3,5,6,10,13,24,27
1,2,3,3,5,6,8,10,13,24,27 到这里排序已经结束
1,2,3,3,5,6,8,10,13,24,27 从这里开始，以下都是无效劳动
1,2,3,3,5,6,8,10,13,24,27
1,2,3,3,5,6,8,10,13,24,27
1,2,3,3,5,6,8,10,13,24,27
1,2,3,3,5,6,8,10,13,24,27
1,2,3,3,5,6,8,10,13,24,27
1,2,3,3,5,6,8,10,13,24,27
1,2,3,3,5,6,8,10,13,24,27
1,2,3,3,5,6,8,10,13,24,27

大有优化的余地