一旦更多关于PHP中的多维数组删除重复值 [英] Once more about removing duplicate values from a multi-dimensional array in PHP

问题描述

在经过辛苦的搜索，我发现像我想解决一些类似的问题，但我不能用自己的答案。

After an exhausting search I found some similar problems like the one I would like to solve, but I could not use their answers.

海尔一些很好的例子：

<一个href=\"http://stackoverflow.com/questions/307674/how-to-remove-duplicate-values-from-a-multi-dimensional-array-in-php\">How从PHP中多维数组中删除重复值

How to remove duplicate values from a multi-dimensional array in PHP

<一个href=\"http://stackoverflow.com/questions/307674/how-to-remove-duplicate-values-from-a-multi-dimensional-array-in-php\">How从PHP中多维数组中删除重复值

How to remove duplicate values from a multi-dimensional array in PHP

<一个href=\"http://stackoverflow.com/questions/22139377/how-to-remove-duplicate-values-from-a-multi-dimensional-array-in-php-revisited\">How从PHP中的多维数组删除重复值重新

这一个是最相似的，但答案不知何故不工作我了。

This one is the most similar, but the answer somehow doesn't work to me.

<一个href=\"http://stackoverflow.com/questions/22001121/php-filter-array-values-and-remove-duplicates-from-multi-dimensional-array\">php滤镜阵列值并从多维数组复制

我的问题的主要区别是，当人们正在寻找一个解决方案，以从​​阵列中删除整个复制子阵，我试图删除子阵只有一个$键=> $ value对的子阵列是类似记者对另一子数组。其它对可以具有不同的值或者甚至相同。

The main difference to my issue is that while people are looking for a solution to delete an entire duplicated subarray from the array, I'm trying to delete the subarray when only one $key => $value pair of the subarray is similar to the correspondent pair of another subarray. The other pairs could have different values or even the same.

下面我的数组：

Array(

[0] => Array
    (
        [0] => AAA
        [1] => 500
    )

[1] => Array //Won't be delete 'cause [0] is different, although [1] is the same.
    (
        [0] => BBB
        [1] => 500
    )

[2] => Array //Will be delete 'cause [0] is the same.
    (
        [0] => AAA
        [1] => 500
    )

[3] => Array //Won't be delete 'cause [0] is different.
    (
        [0] => CCC
        [1] => 820
    )

[4] => Array
    (
        [0] => AAA //Will be delete 'cause [0] is the same. [1] is also different.
        [1] => 774
    )

我怎么能设法删除这些子阵，所以我有以下结果：

How could I manage to delete these subarrays so I have following result:

Array(

[0] => Array
    (
        [0] => AAA
        [1] => 500
    )

[1] => Array
    (
        [0] => BBB
        [1] => 500
    )

[2] => Array
    (
        [0] => CCC
        [1] => 820
    )

提前感谢！

推荐答案

最简单的方法（在我看来），而不是使用神奇的 array_filter 和 array_map 手工艺是难以维持，是写一个专门的功能自己：

The easiest solution (in my opinion), instead of using magical array_filter and array_map handicraft which is difficult to maintain, is to write a specialized function yourself:

$out = [];
$usedKeys = [];
foreach ($in as $element)
{
    list ($a, $b) = $element;
    if (!isset($usedKeys[$a]))
    {
        $usedKeys[$a] = true;
        $out[]= $element;
    }
}
var_dump($out);

这将只返回元素的第一对元素独特的（以第一位的，如果多个条目可用）。

This will return only elements whose first pair element is unique (taking first one, if multiple entries are available).

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