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：
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<?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：
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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：
科学计算器在线使用_高级计算器在线计算：https://tool.tuohang.net/t/jsq/
希望本文所述对大家PHP程序设计有所帮助。
原文链接：http://blog.csdn.net/tf198910/article/details/44957917
