PHP-使关联数组唯一，键->价值和价值->钥匙 [英] PHP - Make an associative array unique, key -> value and value -> key

问题描述

我在php中有一个小问题，我很难用语言来解释.我有一个包含键值的关联数组.我想制作一个函数(或者如果已经有一个函数)，该函数将数组作为输入并删除重复项，但是两种方式都可以.

I have a little problem in php, which i find hard to explain in words. I have an associative array which contains key-value. I would like to make a function (or if there is already one) which would take an array as input and remove the duplicates but both ways.

例如:

在我的数组中，我有{a-> b} {a-> c} {b-> a} {b-> c} ...

In my array I have {a -> b} {a -> c} {b -> a} {b -> c} ...

从这个角度看，似乎没有任何重复，但是对我来说{a-> b}和{b-> a}是重复的.因此，我希望函数将其视为重复项，并且只返回其中之一.

From this view it does not seem like there is any duplicate, but to me {a -> b} and {b -> a} are duplicate. So I would like the function to see it as a duplicate and only return one of them.

我试图在循环中使用array_flip/array_unique交换键和值，但效果不佳.

I tried to use array_flip / array_unique to exchange the key and the values, in a loop but didn't quite work.

即使数组长度很大，您能帮忙找到一种方法吗?或是否有执行此功能的php函数.

Could you help to find a way to do this even if it is array with a large length? or if there is a php function which does it.

非常感谢您的帮助.

有代码可以说明这个想法:

There is code to illustrate the idea:

对于这样的数组:

Array ( 
    [0] => Array ( [0] => a [1] => b)
    [1] => Array ( [0] => a [1] => c )
    [2] => Array ( [0] => b [1] => a )
    [3] => Array ( [0] => b [1] => c )
)

推荐答案

这将删除您的重复项

foreach($array as $key => $value){
     if (isset($array[$key])){
        if(isset($array[$value])){
            if($array[$value] == $key){
                unset($array[$value]);
            }
        }
     }
 }

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