三维数组把一维的值放进二维里

Question

Array
(
    [2] => Array
        (
            [0] => Array
                (
                    [order_id] => 20200403135140

                )

            [1] => Array
                (
                    [order_id] => 20200105000000

                )

        )

    [1] => Array
        (
            [0] => Array
                (
                    [order_id] => 20200222000000

                )

        )

    [0] => Array
        (
            [0] => Array
                (
                    [order_id] => 20200401000001

                )

        )

)

现在想把元素1、2里的参数
[0] => Array
(
[order_id] => 20200403135140

            )

        [1] => Array
            (
                [order_id] => 20200105000000

            )
                            [0] => Array
            (
                [order_id] => 20200222000000

            )

                            拿出来放进元素0里

                            最后形成的是一个大的数组
                            array{
                                    array{
                                    [0]
                                    [1]
                                    [2]
                                    [3]
                                    }
                            }

                            这样的 应该怎么搞  谢谢