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PHP自定义函数生成笛卡尔积 PHP基于自定义函数生成笛卡尔积的方法示例

崇拜飞哥 人气:0
想了解PHP基于自定义函数生成笛卡尔积的方法示例的相关内容吗,崇拜飞哥在本文为您仔细讲解PHP自定义函数生成笛卡尔积的相关知识和一些Code实例,欢迎阅读和指正,我们先划重点:PHP,自定义函数,生成,笛卡尔积,下面大家一起来学习吧。

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:

<?php
  $color = array('red', 'green');
  $size = array(39, 40, 41);
  $local = array('beijing', 'shanghai');
  echo "<pre>";
  print_r(combineDika($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;
  }
?>

运行结果:

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.softyun.net/jisuanqi/equ_jisuanqi

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

在线计算器_标准计算器:
http://tools.softyun.net/jisuanqi/jsq

希望本文所述对大家PHP程序设计有所帮助。

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