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); $local = array('beijing', 'shangh/【一个开发人员，能懂服务器量好，反之一个服务器维护人员，也应该懂开发】/ai'); echo "<pre>"; print_r(combineDika($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 ) )