求助， php 数组中，要得到任意划分为$n 份的所有情况，求代码。

[lindun17]

已知
$words = array('1','2','3','4','5','6','7','8');
$day = 3;
要得到任意分成$day组的情况
例如
这样的结果
Array
(
[0] => Array
(
[0] => Array
(
[0] => 1
)
[1] => Array
(
[0] => 23
)
[2] => Array
(
[0] => 4567
)
)

[1] => Array
    (
        [0] => Array
        (
            [0] => 1
        )
        [1] => Array
        (
            [0] => 56
        )
                [2] => Array
        (
            [0] => 2347
        )
    )
[2] => Array
    (
        [0] => Array
        (
            [0] => 12
        )
        [1] => Array
        (
            [0] => 56
        )
                    [2] => Array
        (
            [0] => 347
        )
    )

..。

[lindun17]

有大牛吗？