[翻译]  PHP: How to compare keys in one array with values in another, and return matches?

[CHINESE]  PHP:如何比较一个数组中的键与另一个数组中的值,并返回匹配?


I have the following two arrays:

我有以下两个数组:

$array_one = array('colorZero'=>'black', 'colorOne'=>'red', 'colorTwo'=>'green', 'colorThree'=>'blue', 'colorFour'=>'purple', 'colorFive'=>'golden');

$array_two = array('colorOne', 'colorTwo', 'colorThree');

I want an array from $array_one which only contains the key-value pairs whose keys are members of $array_two (either by making a new array or removing the rest of the elements from $array_one)

我想要一个来自$ array_one的数组,它只包含其键是$ array_two成员的键值对(通过创建一个新数组或从$ array_one中删除其余元素)

How can I do that?

我怎样才能做到这一点?

I looked into array_diff and array_intersect, but they compare values with values, and not the values of one array with the keys of the other.

我查看了array_diff和array_intersect,但是它们将值与值进行比较,而不是将一个数组的值与另一个数组的值进行比较。

4 个解决方案

#1


3  

If I am understanding this correctly:

如果我理解正确的话:

Returning a new array:

返回一个新数组:

$array_new = [];
foreach($array_two as $key)
{
    if(array_key_exists($key, $array_one))
    {
        $array_new[$key] = $array_one[$key];
    }
}

Stripping from $array_one:

从$ array_one中剥离:

foreach($array_one as $key => $val)
{
    if(array_search($key, $array_two) === false)
    {
        unset($array_one[$key]);
    }
}

#2


14  

As of PHP 5.1 there is array_intersect_key (manual).

从PHP 5.1开始,有array_intersect_key(手动)。

Just flip the second array from key=>value to value=>key with array_flip() and then compare keys.

只需使用array_flip()将第二个数组从key => value翻转到value => key,然后比较键。

So to compare OP's arrays, this would do:

因此,为了比较OP的数组,这将做:

$result = array_intersect_key( $array_one , array_flip( $array_two ) );

No need for any looping the arrays at all.

根本不需要任何循环数组。

#3


0  

Tell me if it works:

告诉我它是否有效:

for($i=0;$i<count($array_two);$i++){
  if($array_two[$i]==key($array_one)){
     $array_final[$array_two[$i]]=$array_one[$array_two[$i]];
     next($array_one);
  }
}

#4


0  

<?php 
$array_one = array('colorZero'=>'black', 'colorOne'=>'red', 'colorTwo'=>'green', 'colorThree'=>'blue', 'colorFour'=>'purple', 'colorFive'=>'golden');

$array_two = array('colorOne', 'colorTwo', 'colorThree');

print_r(array_intersect_key($array_one, array_flip($array_two))); 
?> 


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