PHP: key->value from two array elements

Question

Basically, I have an array where each element is a key/value pair of elements, like this:

[myArray] => Array
        [0] => Array
                [id] => 121
                [name] => Value1
        [1] => Array
                [id] => 125
                [name] => Value2
        [2] => Array
                [id] => 129
                [name] => Value3
                ....

And I want to convert this to:

[myArray] => Array        
        [121] => Value1
        [125] => Value2
        [129] => Value3
        ....

so the 'id' element becomes the key, and the 'name' element becomes the value. Does PHP have something built in (or is there a clever trick) to do this? I'd like to avoid the obvious foreach() loop if there's something cleaner available...

I don't know if there is a built-in function to handle this task, but even if there is, it's definitely using some sort of loop structure to accomplish the task. A simple foreach loop should more than suffice. Is that a problem in your implementation? — HartleySan
– HartleySan, Commented Jul 17, 2013 at 1:04

Community · Accepted Answer · 2023-11-17 20:24:57Z

5

PHP 5.5 has an array_column() function which can do this for you, if you're lucky enough to be running that already. The developer who submitted it also has a forwards-compatible version you can download for earlier versions of PHP.

However, it's pretty easy to roll your own, or just use a foreach loop for the particular case you need.

edited Nov 17, 2023 at 20:24

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answered Jul 17, 2013 at 1:10

IMSoP

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1 Comment

Malek Over a year ago

Unfortunately we're running in a 5.3 environment and that's not getting changed any time soon. Thanks though, array_column() is EXACTLY what I needed =)

Bill Criswell · Accepted Answer · 2013-07-17 01:22:05Z

0

If you have array_column available you can do:

array_column($myArray, 'name', 'id')

I think the foreach is the much better option, though.

edited Jul 17, 2013 at 1:22

answered Jul 17, 2013 at 1:15

Bill Criswell

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2 Comments

Ben Over a year ago

why the complicated combine? array_column($myArray, 'name','id') would suffice..

Bill Criswell Over a year ago

Ah. Wasn't aware of the index argument. Nice.

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