重命名多维数组相关联的钥匙 [英] Renaming the keys in multidimensional associate arrays

问题描述

我已搜查SO和谷歌已经发现很多类似的问题，但没有适合我的确切使用情况。

I have searched SO and Google and have found lots of similar questions, but nothing that fits my exact use case.

我有数组这样的数组：

Array
(
    [0] => Array
        (
            [id] => c80c5133-1140-8187-ad3b-524b4ed0f1a8
            [date_entered] => 10/01/2013 03:38pm
        )

    [1] => Array
        (
            [id] => 176815c6-b57f-7643-0f08-524b4f22b51c
            [date_entered] => 10/01/2013 03:42pm
        )

    [2] => Array
        (
            [id] => df0f8824-0b12-b92e-1d2e-524c6cb19c41
            [date_entered] => 10/02/2013 11:56am
        )

)

我需要重新命名的第一个维度的关键是在第二维数组像这样date_entered键的值，这样我可以（希望）阵列的最近日期排序。我需要preserve每个数组的内容，因为我需要抓住对应于正确的日期编号。

I need to rename the keys of the first dimension to be the value of the date_entered key in the second dimension arrays like this so that I can (hopefully) sort the array by the most recent date. I need to preserve the contents of each array because I will need to grab the ID that corresponds to the correct date.

Array
(
    [10/01/2013 03:38pm] => Array
        (
            [id] => c80c5133-1140-8187-ad3b-524b4ed0f1a8
            [date_entered] => 10/01/2013 03:38pm
        )

    [10/01/2013 03:42pm] => Array
        (
            [id] => 176815c6-b57f-7643-0f08-524b4f22b51c
            [date_entered] => 10/01/2013 03:42pm
        )

    [10/02/2013 11:56am] => Array
        (
            [id] => df0f8824-0b12-b92e-1d2e-524c6cb19c41
            [date_entered] => 10/02/2013 11:56am
        )

)

我试图做这样的（这显然是不正确的），但我的生活我仍然不能得到它。

I am trying to do it like this (which is obviously not correct) but for the life of me I still can't get it.

foreach ($array as $key) {
    foreach ($key as $subkey => $subvalue) {
        if ($subkey == 'date_entered') {
            // change the name of the key?
        }
    }
}

我真的多维数组挣扎，操纵他们，不管我读了多少和实践！谁能帮助？

I am really struggling with multidimensional arrays and manipulating them, no matter how much I read and practice! Can anyone help?

推荐答案

这code应该这样做：

This code should do it:

$newArray = array();

foreach ($array as $id => $dataset) {
  $newArray[ $dataset['date_entered'] ] = $dataset;
}

我创建了一个新的数组因为这里的改变foreach循环中的数组可能会导致意外的行为的（的来源）。

如果你真的需要preserve你原来的数组，你可以使用数字索引来访问元素：

If you really need to preserve your original array, you can use your numeric indices for accessing the elements:

$arrCount = count($array);
for ($i=0; $i<$arrCount; $i++) {
  $array[ $dataset['date_entered'] ] = $array[$i];
  unset($array[$i]);
}

所有的元素被复制，他们得到取消设置前/在previous键删除。

All elements get copied before they get unset/deleted at the previous key.

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