PHP自定义函数生成笛卡尔积

<?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
)

)

————————————————
版权声明：本文为CSDN博主「崇拜飞哥」的原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/tf198910/article/details/44957917