PHP将stdClass对象转换为数组并按值进行分组

Question

我正在研究一个多维数组。我如何按价值分组？在下面的数组[0] [1]中有相同的group_id。在这种情况下，我想将这些组合在一起。

Array
(
    [0] => stdClass Object
        (
            [id] => 142
            [city_name] => Abhayapuri
            [state_id] => 4
            [group_id] => 2
        )

    [1] => stdClass Object
        (
            [id] => 494
            [city_name] => Achabbal
            [state_id] => 15
            [group_id] => 2
        )

    [2] => stdClass Object
        (
            [id] => 1302
            [city_name] => Achhnera
            [state_id] => 34
            [group_id] => 1
        )
)

有没有办法实现它。