PHP基于自定义函数生成笛卡尔积的方法示例

本文实例讲述了PHP基于自定义函数生成笛卡尔积的方法。分享给大家供大家参考，具体如下：

rush:PHP;"> PHP $color = array('red','green'); $size = array(39,40,41); $local = array('beijing','shanghai'); echo "

";
  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;
  }
?>

运行结果：

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：

科学计算器在线使用_高级计算器在线计算：

在线计算器_标准计算器：

更多关于PHP相关内容感兴趣的读者可查看本站专题：《》、《》、《》、《》、《》、《》及《》

希望本文所述对大家PHP程序设计有所帮助。