我有以下数组：

$original_array = [
            [
                "group" => "g1",
                "department" => "d1",
                "team" => null,
                "data_col1" => "some_data1",
                "data_col2" => "some_data2"
            ],
            [
                "group" => "g1",
                "department" => "d1",
                "team" => null,
                "data_col1" => "some_data3",
                "data_col2" => "some_data4"
            ],
            [
                "group" => "g1",
                "department" => "d1",
                "team" => "t3",
                "data_col1" => "some_data5",
                "data_col2" => "some_data6"
            ],
            [
                "group" => "g4",
                "department" => "d6",
                "team" => "t11",
                "data_col1" => "some_data7",
                "data_col2" => "some_data8"
            ]
        ];

我想将阵列"分组"到通用组/部门/团队中。
我尝试了以下方法：创建一个新数组，然后分配相关键（group/department/team），否则分配值：

$new_array = [];

    foreach ($original_array as $row) {
        foreach ($row as $key => $value) {
            if ($key === "group" || $key === "department" || $key === "team") {
                $new_array[$key] = $value;
            } else {
                $new_array[] = $value;
            }
        }
    }

预期结果为：

[
    0 => [
        group => "g1",
        department => "d1",
        team => null,
        data => [
            0 => [data_col1 => "some_data1", data_col2 => "some_data2"],     
            1 => [data_col1 => "some_data3", data_col2 => "some_data4"]
    ],
    1 => [
        group => "g1",
        department => "d1",
        team => "t3",
        data => [
            0 => [data_col1 => "some_data5", data_col2 => "some_data6"]                   
    ],  
    2 => [
        group => "g4",
        department => "d6",
        team => "t11",
        data => [
            0 => [data_col1 => "some_data7", data_col2 => "some_data8"]
    ]
]

但结果是：

[
  "group" => "g4"
  "department" => "d6"
  "team" => "t11"
  0 => "some_data1"
  1 => "some_data2"
  2 => "some_data3"
  3 => "some_data4"
  4 => "some_data5"
  5 => "some_data6"
  6 => "some_data7"
  7 => "some_data8"
]

为什么？看起来它只给原始数组的最后一行赋值