这篇文章主要介绍了PHP基于自定义函数生成笛卡尔积的方法,结合具体实例形式分析了php使用数组运算模拟集合实现笛卡尔积运算的相关操作技巧,需要的朋友可以参考下
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);
$local = array('beijing', 'shanghai');
echo "<pre class="brush:php;toolbar:false">";
print_r(combineDika($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
)
)以上是php自定义函数生成笛卡尔积的方法的详细内容。更多信息请关注PHP中文网其他相关文章！
