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Homephp教程PHP源码四种排序算法PHP实现类

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 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 < $count; $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 < $count-1; $i++) {
      $min = $i;
      for ($j = $i+1; $j < $count; $j++) {
        if ($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 < $count; $i++) {
      for ($j = $count-1; $j > $i; $j--) {
        if ($arr[$j] < $arr[$j-1]) {
          $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) <= 1) return $arr; 
    $key = $arr[0];
    $left_arr = array();
    $right_arr = array();
    for ($i = 1; $i < count($arr); $i++){
      if ($arr[$i] quick_sort($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 = &#39;date[&#39; . date(&#39;Y-m-d H:i:s&#39;) . &#39;] &#39; . $msg . &#39;\n&#39;;
    return @file_put_contents(&#39;sort_err.log&#39;, $msg, FILE_APPEND);
  }
}
/*End of file sort.php*/
/*Location htdocs/sort.php */

                   

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