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php排序算法?php排序经典算法

Jun 13, 2016 am 09:49 AM
php No several right Summarize sort article algorithm classic

本文章来给大家总结几个不错的php排序算法,希望这些算法对各位同学会有所帮助哦。

 代码如下 复制代码


1.冒泡算法,排序算法,由于在排序过程中总是小数往前放,大数往后放,相当于气泡往上升,所以称作冒泡排序

$array = array(a,f,c,b,e,h,j,i,g); 

   function maopao_fun($array){ 

       if($len

           return $arr; 

       } 

       $count = count($array); 

       for($i=0;$i

           for($j=$count-1;$j>$i;$j--){ 

               if($array[$j] > $array[$j-1]){ 

                   $tmp = $array[$j]; 

                   $array[$j] = $array[$j-1]; 

                   $array[$j-1] = $tmp; 

               } 

           } 

       } 

       return $array; 

   } 

2.快速排序,
快速排序(Quicksort)是对冒泡排序的一种改进。
由C. A. R. Hoare在1962年提出。它的基本思想是:通过一趟排序将要排序的数据分割成独立的两部分,
其中一部分的所有数据都比另外一部分的所有数据都要小,然后再按此方法对这两部分数据分别进行快速排序,
整个排序过程可以递归进行,以此达到整个数据变成有序序列。

function quickSort($arr){ 

       $len = count($arr); 

       if($len

           return $arr; 

       } 

       $key = $arr[0]; 

       $left_arr    = array(); 

       $right_arr    = array(); 

       for($i=1; $i

           if($arr[$i]

               $left_arr[] = $arr[$i]; 

           } else { 

               $right_arr[] = $arr[$i]; 

           } 

       } 

       $left_arr    = quickSort($left_arr); 

       $right_arr    = quickSort($right_arr); 

       return array_merge($left_arr, array($key), $right_arr); 

   } 

3.选择排序
每一趟从待排序的数据元素中选出最小(或最大)的一个元素,
顺序放在已排好序的数列的最后,直到全部待排序的数据元素排完。 选择排序是不稳定的排序方法

 代码如下 复制代码

function select_sort($arr){ 

    $count = count($arr); 

    for($i=0; $i

        for($j=$i+1; $j

            if ($arr[$i] > $arr[$j]){ 

                $tmp = $arr[$i]; 

                $arr[$i] = $arr[$j]; 

                $arr[$j] = $tmp; 

            } 

        } 

    } 

    return $arr; 

4.插入排序
  从第一个元素开始,该元素可以认为已经被排序
  取出下一个元素,在已经排序的元素序列中从后向前扫描
  如果该元素(已排序)大于新元素,将该元素移到下一位置
  重复步骤3,直到找到已排序的元素小于或者等于新元素的位置
  将新元素插入到下一位置中
  重复步骤2

 代码如下 复制代码

function insert_sort($arr){ 

        $count = count($arr); 

        for($i=1; $i

            $tmp = $arr[$i]; 

            $j = $i - 1; 

            while($arr[$j] > $tmp){ 

                $arr[$j+1] = $arr[$j]; 

                $arr[$j] = $tmp; 

                $j--; 

            } 

        } 

        return $arr; 

    } 

  

    $arr = array(49,38,65,97,76,13,27); 

    print_r(insert_sort($arr));


 

四种排序算法的PHP实现

1) 插入排序(Insertion Sort)的基本思想是:
每次将一个待排序的记录,按其关键字大小插入到前面已经排好序的子文件中的适当位置,直到全部记录插入完成为止。
2) 选择排序(Selection Sort)的基本思想是:
每一趟从待排序的记录中选出关键字最小的记录,顺序放在已排好序的子文件的最后,直到全部记录排序完毕。
3) 冒泡排序的基本思想是:
两两比较待排序记录的关键字,发现两个记录的次序相反时即进行交换,直到没有反序的记录为止。
4) 快速排序实质上和冒泡排序一样,都是属于交换排序的一种应用。所以基本思想和上面的冒泡排序是一样的。

 代码如下 复制代码

 /**
 * 四种排序算法设计(PHP)
 *
 * 1) 插入排序(Insertion Sort)的基本思想是:
   每次将一个待排序的记录,按其关键字大小插入到前面已经排好序的子文件中的适当位置,直到全部记录插入完成为止。
   2) 选择排序(Selection Sort)的基本思想是:
      每一趟从待排序的记录中选出关键字最小的记录,顺序放在已排好序的子文件的最后,直到全部记录排序完毕。
   3) 冒泡排序的基本思想是:
      两两比较待排序记录的关键字,发现两个记录的次序相反时即进行交换,直到没有反序的记录为止。
   4) 快速排序实质上和冒泡排序一样,都是属于交换排序的一种应用。所以基本思想和上面的冒泡排序是一样的。
 *
 * @author quanshuidingdang
 */
class Sort {
 private $arr  = array(); 
 private $sort = 'insert';
 private $marker = '_sort';
 
 private $debug = TRUE;
 
 /**
  * 构造函数
  *
  * @param array 例如: $config = array (
         'arr' => array(22,3,41,18) ,  //需要排序的数组值
         'sort' => 'insert',      //可能值: insert, select, bubble, quick
         'debug' => TRUE        //可能值: TRUE, FALSE
         )
  */
 public function __construct($config = array()) {
  if ( count($config) > 0) {
   $this->_init($config);
  }
 }
 
 /**
  * 获取排序结果
  */
 public function display() {
  return $this->arr;
 }
 
 /**
  * 初始化
  *
  * @param array
  * @return  bool
  */
 private function _init($config = array()) {
  //参数判断
  if ( !is_array($config) OR count($config) == 0) {
   if ($this->debug === TRUE) {
    $this->_log("sort_init_param_invaild");
   }
   return FALSE;
  }
  
  //初始化成员变量
  foreach ($config as $key => $val) {
   if ( isset($this->$key)) {
    $this->$key = $val;
   }
  }
  
  //调用相应的成员方法完成排序
  $method = $this->sort . $this->marker;
  if ( ! method_exists($this, $method)) {
   if ($this->debug === TRUE) {
    $this->_log("sort_method_invaild");
   }
   return FALSE;
  }
  
  if ( FALSE === ($this->arr = $this->$method($this->arr)))
   return FALSE;
  return TRUE;
 }
 
 /**
  * 插入排序
  *
  * @param array
  * @return bool
  */
 private function insert_sort($arr) {
  //参数判断
  if ( ! is_array($arr) OR count($arr) == 0) {
   if ($this->debug === TRUE) {
    $this->_log("sort_array(insert)_invaild");
   }
   return FALSE;
  }
  
  //具体实现
  $count = count($arr);
  for ($i = 1; $i    $tmp = $arr[$i];
   for($j = $i-1; $j >= 0; $j--) { 
    if($arr[$j] > $tmp) {
     $arr[$j+1] = $arr[$j];
     $arr[$j] = $tmp;
    }
   }
  }
  return $arr;
 }
 
 /**
  * 选择排序
  *
  * @param array
  * @return bool
  */
 private function select_sort($arr) {
  //参数判断
  if ( ! is_array($arr) OR count($arr) == 0) {
   if ($this->debug === TRUE) {
    $this->_log("sort_array(select)_invaild");
   }
   return FALSE;
  }
  
  //具体实现
  $count = count($arr);
  for ($i = 0; $i    $min = $i;
   for ($j = $i+1; $j     if ($arr[$min] > $arr[$j])  $min = $j;
   }
   if ($min != $i) {
    $tmp = $arr[$min];
    $arr[$min] = $arr[$i];
    $arr[$i] = $tmp;
   }
  }
  return $arr;
 }
 
 /**
  * 冒泡排序
  *
  * @param array
  * @return bool
  */
 private function bubble_sort($arr) {
  //参数判断
  if ( ! is_array($arr) OR count($arr) == 0) {
   if ($this->debug === TRUE) {
    $this->_log("sort_array(bubble)_invaild");
   }
   return FALSE;
  }
  
  //具体实现
  $count = count($arr);
  for ($i = 0; $i    for ($j = $count-1; $j > $i; $j--) {
    if ($arr[$j]      $tmp = $arr[$j];
     $arr[$j] = $arr[$j-1];
     $arr[$j-1] = $tmp;
    }
   }
  }
  return $arr; 
 }
 
 /**
  * 快速排序
  *
  * @param array
  * @return bool
  */
 private function quick_sort($arr) {
  //具体实现
  if (count($arr)   $key = $arr[0];
  $left_arr = array();
  $right_arr = array();
  for ($i = 1; $i    if ($arr[$i]     $left_arr[] = $arr[$i];
   else
    $right_arr[] = $arr[$i];
  }
  $left_arr = $this->quick_sort($left_arr);
  $right_arr = $this->quick_sort($right_arr);

  return array_merge($left_arr, array($key), $right_arr);
 }
 
 /**
  * 日志记录
  */
 private function _log($msg) {
  $msg = 'date[' . date('Y-m-d H:i:s') . '] ' . $msg . 'n';
  return @file_put_contents('sort_err.log', $msg, FILE_APPEND);
 }
}

/*End of file sort.php*/
/*Location htdocs/sort.php */

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