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本文實例講述了PHP基于自定義函數生成笛卡爾積的方法。分享給大家供大家參考，具體如下：

<?php
  $color = array('red', 'green');
  $size = array(39, 40, 41);
  $local = array('beijing', 'shanghai');
  echo "<pre>";
  print_r(combineDika($color, $size, $local));
  /**
   * 所有數組的笛卡爾積
   *
   * @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;
  }
  /**
   * 兩個數組的笛卡爾積
   *
   * @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;
  }
?>

運行結果：

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：這里再為大家推薦幾款計算工具供大家進一步參考借鑒：

在線一元函數（方程）求解計算工具：
http://tools.gimoo.net/jisuanqi/equ_jisuanqi

科學計算器在線使用_高級計算器在線計算：
http://tools.gimoo.net/jisuanqi/jsqkexue

在線計算器_標準計算器：
http://tools.gimoo.net/jisuanqi/jsq

更多關于PHP相關內容感興趣的讀者可查看本站專題：《PHP數學運算技巧總結》、《PHP運算與運算符用法總結》、《php字符串(string)用法總結》、《PHP數組(Array)操作技巧大全》、《PHP數據結構與算法教程》、《php程序設計算法總結》及《php正則表達式用法總結》

希望本文所述對大家PHP程序設計有所幫助。