PHP数组遍历 sku属性值配对

    $skuattr = Array
    (
        '7' => Array
            (
                '6' => '22x33',
                '9' => '44x55',
            ),

        '8' => Array
            (
                '12' => '大小号'
            ),

        '9' => Array
            (
                '8' => '金属质',
                '13' => '塑料',
            ),

        '16' => Array
            (
                '14' => '圆形'
            )

    );

得到4个值
7:6;8:12;9:8;16:14;
7:9;8:12;9:8;16:14
7:6;8:12;9:13;16:14
7:9;8:12;9:13;16:14
因为键值是动态的，所以需要一个数组遍历的算法，得到结果，大神求助

---

原理就是要求笛卡尔积，写了一个简单的例子

phpfunction combineDika($data) {
    $result = array();
    foreach (array_shift($data) as $k=>$item) {
        $result[] = array($k=>$item);
    }


    foreach ($data as $k => $v) {
        $result2 = [];
        foreach ($result as $k1=>$item1) {
            foreach ($v as $k2=>$item2) {
                $temp     = $item1;
                $temp[$k2]   = $item2;
                $result2[] = $temp;
            }
        }
        $result = $result2;
    }
    return $result;
}

$skuattr = Array
(
    '7'  => Array
    (
        '6' => '22x33',
        '9' => '44x55',
    ),

    '8'  => Array
    (
        '12' => '大小号'
    ),

    '9'  => Array
    (
        '8'  => '金属质',
        '13' => '塑料',
    ),

    '16' => Array
    (
        '14' => '圆形'
    )

);

$a = combineDika($skuattr);
print_r($a);

phpArray
(
    [0] => Array
        (
            [6] => 22x33
            [12] => 大小号
            [8] => 金属质
            [14] => 圆形
        )

    [1] => Array
        (
            [6] => 22x33
            [12] => 大小号
            [13] => 塑料
            [14] => 圆形
        )

    [2] => Array
        (
            [9] => 44x55
            [12] => 大小号
            [8] => 金属质
            [14] => 圆形
        )

    [3] => Array
        (
            [9] => 44x55
            [12] => 大小号
            [13] => 塑料
            [14] => 圆形
        )

)