二维数组把某一相同健值进行归类

用PHP把一个二维数组的相同健值进行归类，如下：

//原始二维数组$info
Array
(
    [0] => Array
        (
            [last_number] => 1
            [goods_id] => 4028
            [self_category_id] => 399
        )

    [1] => Array
        (
            [last_number] => 1
            [goods_id] => 4031
            [self_category_id] => 254
        )

    [2] => Array
        (
            [last_number] => 1
            [goods_id] => 4023
            [self_category_id] => 548
        )

    [3] => Array
        (
            [last_number] => 1
            [goods_id] => 4027
            [self_category_id] => 399
        )

)

需要把上面的数组进行归类成如下形式：

//结果$result
Array
(
    [399] => Array
        (
            [0] => Array
                (
                    [last_number] => 1
                    [goods_id] => 4028
                    [self_category_id] => 399
                )

            [1] => Array
                (
                    [last_number] => 1
                    [goods_id] => 4027
                    [self_category_id] => 399
                )
        )

    [254] => Array
        (
            [0] => Array
                (
                    [last_number] => 1
                    [goods_id] => 4031
                    [self_category_id] => 254
                )
        )

    [548] => Array
        (
            [0] => Array
                (
                    [last_number] => 1
                    [goods_id] => 4023
                    [self_category_id] => 548
                )
        )
)

处理可以使用下面方法

$result= array();
if($info)
foreach ($info as $key => $value) {
    $result[$value["self_category_id"]][] = $value;
}