php数组排序几个程序实例

A.内部排序（直接加载到内存进行排序）:包括交换式排序（冒泡和快速法）、选择式排序、插入式排序
B.外部排序（因数据量大，需借助外部存储进行排序）：包括合并排序、直接合并排序

 【选择排序：第二个数至第n个数分别与第一个数比较，进行交换，第三个数至第n个数分别与第二个数比较，进行交换，直到排完】

代码如下

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function selectSort($arr,$style)              {                  $temp=0;                  for($i=0;$i                 {                      for($j=$i+1;$j                     {                          if($style=='bts') $op=$arr[$i]                         else if($style=='stb') $op=$arr[$i]>$arr[$j];                          if($op)                          {                              $temp=$arr[$i];                              $arr[$i]=$arr[$j];                              $arr[$j]=$temp;                          }                      }                  }                  foreach ($arr as $key => $value)                  {                      echo $value.',';                     }              }              $arr1=array(21.5,33,90,7,-4,5,55,11);              selectSort($arr1,'stb');

【默认传递的是值，不是地址。如果在$arr前加个&，则和$arr1指向同一个地址，函数外的$arr1也被排好了】

代码如下

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function maoPao($arr,$style)    {                  $temp=0;                  for($i=0;$i                 {                      for($j=0;$j                     {                          if($style=='bts') $op=$arr[$j]                         else if($style=='stb') $op=$arr[$j]>$arr[$j+1];                          if($op)                          {                              $temp=$arr[$j];                              $arr[$j]=$arr[$j+1];                              $arr[$j+1]=$temp;                          }                      }                  }                  foreach ($arr as $key => $value)                  {                      echo $value.',';                     }              }              $arr1=array(101,101,-9,-8,0,76,1,57,43,90,23,-56);              maoPao($arr1,'stb');//small to big

【插入排序：第二个与第一个比较，交换，第三个与前两个比较，交换。。。。第n个与前n-1个比较，交换】

代码如下

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function insertSort($arr,$style)              {                  $temp=0;                  for($i=1;$i                 {                      for($j=0;$j                     {                          if($style=='bts') $op=$arr[$j]                         else if($style=='stb') $op=$arr[$j]>$arr[$i];                          if($op)                          {                              $temp=$arr[$j];                              $arr[$j]=$arr[$i];                              $arr[$i]=$temp;                          }                      }                  }                  foreach ($arr as $key => $value)                  {                      echo $value.',';                     }              }              $arr1=array(4,7,0,-7,1,14,5);              insertSort($arr1,'bts');