How to group array by parent id

Here is my array output

这是我的数组输出

Array
(
    [1] => Array
        (
            [id] => 1
            [name] => Category A
            [parent] => 0
        )
    [2] => Array
        (
            [id] => 2
            [name] => Sub Cat A - 1
            [parent] => 1
        )
    [3] => Array
        (
            [id] => 3
            [name] => Sub Cat A - 2
            [parent] => 1
        )
    [4] => Array
        (
            [id] => 4
            [name] => Sub Cat A 2 - 1
            [parent] => 3
        )
    [5] => Array
        (
            [id] => 5
            [name] => Category B
            [parent] => 0
        )
    [6] => Array
        (
            [id] => 6
            [name] => Sub Cat B - 1
            [parent] => 5
        )
    [7] => Array
        (
            [id] => 7
            [name] => Category C
            [parent] => 0
        )
)
Array
(