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：

<?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.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。