如何删除重复的数组？ [英] How to delete duplicates in an array?

问题描述

我怎样才能在数组中删除重复？

How can I delete duplicates in array?

例如，如果我有以下数组：

For example if I had the following array:

$array = array('1','1','2','3');

我希望它成为

$array = array('2','3');

所以我希望它删除整个值，如果两个它被发现

so I want it to delete the whole value if two of it are found

推荐答案

根据PHP版本，这应该在PHP中的所有版本> = 4.0.6，因为它不要求需要PHP> = 5.3匿名函数：

Depending on PHP version, this should work in all versions of PHP >= 4.0.6 as it doesn't require anonymous functions that require PHP >= 5.3:

function moreThanOne($val) {
    return $val < 2;
}


$a1 = array('1','1','2','3');
print_r(array_keys(array_filter(array_count_values($a1), 'moreThanOne')));

演示（更改下拉PHP版本选择版本PHP的您正在使用）

DEMO (Change the PHP version in the drop-down to select the version of PHP you are using)

这工作，因为：

1. array_count_values​​ 将通过数组，每个值创建一个索引，每个再次遇到它时增加它。


2. array_filter 将采取制作的磁盘阵列，并使之通过前面定义的 moreThanOne 函数，如果返回假，键/值对将被删除。


3. array_keys 将丢弃值数组创造与价值是被定义键数组部分。最后一步给你一个结果，消除原来的阵列中存在一次以上的所有值。

1. array_count_values will go through the array and create an index for each value and increment it each time it encounters it again.
2. array_filter will take the created array and pass it through the moreThanOne function defined earlier, if it returns false, the key/value pair will be removed.
3. array_keys will discard the value portion of the array creating an array with the values being the keys that were defined. This final step gives you a result that removes all values that existed more than once within the original array.

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