从多维数组中删除重复键

问题描述

我有一个相当大的数组，其中包含留言板上所有论坛的数据，不幸的是，我遇到了一个问题，我有一些键的重复条目.数组按父级按层次结构排序，这就是为什么它在某些点上会变深.

I have a rather large array that contains data for all of the forums on a message board, unfortunately I am running into an issue where I am having repeat entries for some keys. The array is ordered in an hierarchy by parents, which is why it gets deep at some points.

Array
(
    [0] => Array
        (
            [cat_data] => Array()
            [forum_data] => Array
                (
                    [2] => Array
                        (
                            [subforums] => Array
                                (
                                    [6] => Array
                                        (
                                            [subforums] => Array
                                                (
                                                    [15] => Array()
                                                    [16] => Array()
                                                )
                                        )
                                    [7] => Array()
                                    [15] => Array()
                                    [16] => Array()
                                )
                        )
                    [3] => Array()
                )
        )
)

论坛 id 6 上的子论坛作为论坛 id 2 的子论坛重复.我需要删除数组最低级别的重复键.所以在这个例子中，我想将 15 和 16 保留为 6 的子集，但将它们删除为 2 的子集.

The subforums on the forum id 6 are repeated as subforums for forum id 2. I need to remove the repeated keys that are in the lowest level of the array. So in this example, I would like to keep 15 and 16 as subs of 6 but remove them as subs of 2.

请注意，我正在为板子编写一个应用程序，我不是在生成数组，它是由板子生成的，这就是为什么在创建数组时我无法删除重复项.

Just a note, I am writing an application for the board, I am not generating the array, it is generated by the board, that is why I can't remove the duplicates while the array is being created.

感谢大家的帮助.

推荐答案

应该这样做:

function remove_dup_keys(array &$array) {
    $keys = array();
    foreach ($array as $key => &$value) {
        if (is_array($value)) {
            $keys = array_merge($keys, remove_dup_keys($value));
        }
    }

    foreach ($keys as $key) {
        if (is_numeric($key) && in_array($key, $keys)) {
            unset($array[$key]);
        }
    }

    $keys = array_merge($keys, array_keys($array));
    return $keys;
}

remove_dup_keys($yourarray);

你得到:

Array
(
    [0] => Array
        (
            [cat_data] => Array
                (
                )
            [forum_data] => Array
                (
                    [2] => Array
                        (
                            [subforums] => Array
                                (
                                    [6] => Array
                                        (
                                            [subforums] => Array
                                                (
                                                    [15] => Array
                                                        (
                                                        )
                                                    [16] => Array
                                                        (
                                                        )
                                                )
                                        )
                                    [7] => Array
                                        (
                                        )
                                )
                        )
                    [3] => Array
                        (
                        )
                )
        )
)

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