基于密钥范围的PHP分割数组

I've an array.

我一个数组。

    Array
    (
        [initial] => MSS
        [hour] => 5.2
        [row_checker_1] => 1
        [project_name_1] => KGD001
        [project_shortcode_1] => KGD001
        [5_1] => 23
        [6_1] => 3.3
        [4_1] => 23.2
        [remarks_1] =>  on going
        [task_id] => 76
        [row_checker_2] => 2
        [project_name_2] => DG001
        [project_shortcode_2] => DG001
        [5_2] => 1.1
        [6_2] => 2.2
        [4_2] => 3.1
        [remarks_2] =>   on going
    )


    Array
    (