我如何在两个多维数组之间合并尊重他们的键

Question

假设我有以下数组：

Array
(
    [2001] => Array
        (
            [event_detail] => Array
                (
                    [1] => Array
                        (
                            [event_name] => Advocacy CPD 2019
                            [cpd_points] => 23
                        )

                    [5] => Array
                        (
                            [event_name] => Advocacy CPD 2019 new
                            [cpd_points] => 2
                        )

                )

        )

    [2002] => Array
        (
            [event_detail] => Array
                (
                    [2] => Array
                        (
                            [event_name] => Advocacy CPD 2011
                            [cpd_points] => 28
                        )

                    [4] => Array
                        (
                            [event_name] => Advocacy CPD 20195 new
                            [cpd_points] => 12
                        )

                )

        )

)

第二个：

Array
(
    [2001] => Array
        (
            [event_detail] => Array
                (
                    [1] => Array
                        (
                            [event_name] => Advocacy CPD 2020
                            [cpd_points] => 27
                        )

                )

        )

    [2052] => Array
        (
            [event_detail] => Array
                (
                    [2] => Array
                        (
                            [event_name] => Advocacy CPD 2052
                            [cpd_points] => 258
                        )

                    [4] => Array
                        (
                            [event_name] => Advocacy CPD 2019445 new
                            [cpd_points] => 78
                        )

                )

        )

)

所需的输出是：

Array
(
    [2001] => Array
        (
            [event_detail] => Array
                (
                    [1] => Array
                        (
                            [event_name] => Advocacy CPD 2019
                            [cpd_points] => 23
                        )

                    [5] => Array
                        (
                            [event_name] => Advocacy CPD 2019 new
                            [cpd_points] => 2
                        )

                    [6] => Array
                        (
                            [event_name] => Advocacy CPD 2020
                            [cpd_points] => 27
                        )

                )

        )

    [2002] => Array
        (
            [event_detail] => Array
                (
                    [2] => Array
                        (
                            [event_name] => Advocacy CPD 2011
                            [cpd_points] => 28
                        )

                    [4] => Array
                        (
                            [event_name] => Advocacy CPD 20195 new
                            [cpd_points] => 12
                        )

                )

        )

    [2052] => Array
        (
            [event_detail] => Array
                (
                    [2] => Array
                        (
                            [event_name] => Advocacy CPD 2052
                            [cpd_points] => 258
                        )

                    [4] => Array
                        (
                            [event_name] => Advocacy CPD 2019445 new
                            [cpd_points] => 78
                        )

                )

        )

)

问题是我想在同一个 id[2001,2005,2002] 上合并这些数组。所需的输出排序应与第一个数组中的排序相同。

我已经设法用不同的方式合并这些数组但失败了：

我怎样才能做到这一点？非常感谢任何帮助。

Answer 1

非常简单，只需循环第二个数组并使用第一个数组的键合并：

foreach($array2 as $key => $val) {
    $array1[$key]['event_detail'] = array_merge($array1[$key]['event_detail'],
                                                $val['event_detail']);
}