PHP数组递归函数，用于对根类别下的子值进行分组

I want a recursive function to group all child categories under root category. I've an array like this;

Array
(
    [0] => Array
        (
            [uid] => 1
            [title] => Car
            [Child] => Array
        (
            [0] => Array
              (
                [uid] => 3
                [title] => Color
                [Child] => Array
                (
                    [0] => Array
                      (
                        [uid] => 5
                        [title] => Red 
                      )
                        [1] => Array
                      (
                        [uid] => 6
                        [title] => Blue
                      )
                )
              )
            [1] => Array
              (
                [uid] => 4
                [title] => Door
              )
        )
        )

    [1] => Array
        (
            [uid] => 2
            [title] => Two Wheeler
            [Child] => Array
        (
            [0] => Array
              (
                [uid] => 7
                [title] => Type
                [Child] => Array
                (
                    [0] => Array
                      (
                        [uid] => 9
                        [title] => Scooter 
                      )
                        [1] => Array
                      (
                        [uid] => 10
                        [title] => Bike
                      )
                )
              )
            [1] => Array
              (
                [uid] => 8
                [title] => Company
              )
        )
   )
)

My requirement is to bring all the subchild values to the main category child value. I mean I need the following structure;

Array
(
    [0] => Array
        (
            [uid] => 1
            [title] => Car
            [Child] => Array
                (
                  [0] => Array
                    (
                      [uid] => 3
                      [title] => Color
                    )
                  [1] => Array
                    (
                      [uid] => 4
                      [title] => Door
                    )
                  [2] => Array
                    (
                      [uid] => 5
                      [title] => Red 
                   )
                 [3] => Array
                   (
                     [uid] => 6
                     [title] => Blue
                   )
             )
       )

    [1] => Array
        (
            [uid] => 2
            [title] => Two Wheeler
            [Child] => Array
                  (
                    [0] => Array
                      (
                        [uid] => 7
                        [title] => Type
                      )
                    [1] => Array
                      (
                        [uid] => 8
                        [title] => Company
                      )
                    [2] => Array
                      (
                        [uid] => 9
                        [title] => Scooter 
                      )
                    [3] => Array
                      (
                        [uid] => 10
                        [title] => Bike
                      )
                 )
               )
           )
)

How can I achieve this using a PHP function?