商品规格笛卡尔积PHP

<?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
        )

)

https://blog.csdn.net/tf198910/article/details/44957917