在PHP中将1D数组转换为多维数组

I have this array:

我有这个数组:

Array
(
    [1] => animal
    [1-1] => turtle
    [1-1-1] => sea turtle
    [1-1-2] => box turtle
    [1-1-3] => green turtle
    [1-1-3-1] => green turtle with brown tail
)
Array
(
    [1]