PHP基于自定义函数生成笛卡尔积的方法示例

<"<pre>";
  print_r(combineDika($color, $size, $local));
  /**
   * 所有数组的笛卡尔积
   *
   * @param unknown_type $data
   */
  function combineDika() {
    $data = func_get_args();
    $cnt = count($data);
    $result = array();
    foreach($data[0] as $item) {
      $result[] = array($item);
    }
    for($i = 1; $i < $cnt; $i++) {
      $result = combineArray($result,$data[$i]);
    }
    return $result;
  }
  /**
   * 两个数组的笛卡尔积
   *
   * @param unknown_type $arr1
   * @param unknown_type $arr2
   */
  function combineArray($arr1,$arr2) {
    $result = array();
    foreach ($arr1 as $item1) {
      foreach ($arr2 as $item2) {
        $temp = $item1;
        $temp[] = $item2;
        $result[] = $temp;
      }
    }
    return $result;
  }
"htmlcode">

Array
(
  [0] => Array
    (
      [0] => red
      [1] => 39
      [2] => beijing
    )
  [1] => Array
    (
      [0] => red
      [1] => 39
      [2] => shanghai
    )
  [2] => Array
    (
      [0] => red
      [1] => 40
      [2] => beijing
    )
  [3] => Array
    (
      [0] => red
      [1] => 40
      [2] => shanghai
    )
  [4] => Array
    (
      [0] => red
      [1] => 41
      [2] => beijing
    )
  [5] => Array
    (
      [0] => red
      [1] => 41
      [2] => shanghai
    )
  [6] => Array
    (
      [0] => green
      [1] => 39
      [2] => beijing
    )
  [7] => Array
    (
      [0] => green
      [1] => 39
      [2] => shanghai
    )
  [8] => Array
    (
      [0] => green
      [1] => 40
      [2] => beijing
    )
  [9] => Array
    (
      [0] => green
      [1] => 40
      [2] => shanghai
    )
  [10] => Array
    (
      [0] => green
      [1] => 41
      [2] => beijing
    )
  [11] => Array
    (
      [0] => green
      [1] => 41
      [2] => shanghai
    )
)




PS：这里再为大家推荐几款计算工具供大家进一步参考借鉴：
在线一元函数（方程）求解计算工具：

http://tools.jb51.net/jisuanqi/equ_jisuanqi
科学计算器在线使用_高级计算器在线计算：

http://tools.jb51.net/jisuanqi/jsqkexue
在线计算器_标准计算器：

http://tools.jb51.net/jisuanqi/jsq
更多关于PHP相关内容感兴趣的读者可查看本站专题：《PHP数学运算技巧总结》、《PHP运算与运算符用法总结》、《php字符串(string)用法总结》、《PHP数组(Array)操作技巧大全》、《PHP数据结构与算法教程》、《php程序设计算法总结》及《php正则表达式用法总结》
希望本文所述对大家PHP程序设计有所帮助。