PHP: create an array from values in two arrays based on matching keys

Question

The Problem

I would like to create a new associative array with respective values from two arrays where the keys from each array match.

For example:

// first (data) array:
["key1" => "value 1", "key2" => "value 2", "key3" => "value 3"];

// second (map) array:
["key1" => "map1", "key3" => "map3"];

// resulting (combined) array:
["map1" => "value 1", "map3" => "value 3"];

What I've Tried

$combined = array();
foreach ($data as $key => $value) {
    if (array_key_exists($key, $map)) {
        $combined[$map[$key]] = $value;
    }
}

The Question

Is there a way to do this using native PHP functions? Ideally one that is not more convoluted than the code above...

This question is similar to Combining arrays based on keys from another array. But not exact.

It's also not as simple as using array_merge() and/or array_combine(). Note the arrays are not necessarily equally in length.

Community · Accepted Answer · 2023-11-17 19:22:09Z

3

You can use array_intersect_key() (https://www.php.net/manual/en/function.array-intersect-key.php). Something like that:

$int = array_intersect_key($map, $data);
$combined = array_combine(array_values($map), array_values($int));

Also it would be a good idea ksort() both $map and $data.

edited Nov 17, 2023 at 19:22

CommunityBot

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answered Feb 12, 2014 at 20:04

cyadvert

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2 Comments

Jason McCreary Over a year ago

Why is ksort() a good idea? I assume you think it will optimize performance?

cyadvert Over a year ago

Well, just to play safe... so when array_combine() runs it will combine them in proper keys orders... Just to play safe.

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