PHP基于自定义函数生成笛卡尔积的方法示例

<?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：

科学计算器在线使用_高级计算器在线计算：

在线计算器_标准计算器：

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》