使用PHP获取所有重复值的键 [英] Get all keys for duplicate values using PHP

问题描述

我有一个如下所示的PHP数组

I have a PHP array like below

Array
(
    [825] => ca_knife_features 
    [838] => ca_knife_features 
    [795] => ca_knife_handle_materials 
    [853] => ca_knife_handle_materials 
)

我想将所有键组合为一个相同的值，并将该值作为键，如下所示:

and I want to combine all the keys for a same values and make the value as key as below

Array
(
[ca_knife_features]=>array(825,838)
[ca_knife_handle_materials]=>array(795,853)
)

我该怎么做?

推荐答案

获取所有值的所有键很容易.

Getting all the keys for all the values is easy.

foreach ($array as $key => $value) {
    $result[$value][] = $key;
}

但是，这不仅会得到重复的值.有不同的方法可以做到这一点.一种方法是过滤结果，使其仅显示具有多个键的值.

But that doesn't get only the duplicate values. There are different ways to do that. One way is by filtering the result to only show values with more than one key.

$result = array_filter($result, function($item) {
    return count($item) > 1;
});

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