Multivalue, Multidimensional Array as Single Array

Question

So I have a multidimensional array:

    Array
    (
        [0] => Array
            (
                [User_ID] => 1
                [Username] => A NAME
            )

        [1] => Array
            (
                [User_ID] => 2
                [Username] => ANOTHER NAME
            )
    )

I have seen how to flatten it...but say I want to do that and make it like so:

    Array
   (
       [1(As in the User_ID value)] => A NAME
       [2] => ANOTHER NAME
   )

Essentially creating a single array with the User_ID as the key and the Username as the value. How would I go about doing something like that? If it helps the list of IDs and Names could potentially be hundreds long, so it isn't a static number of items I am working with.

Community · Accepted Answer · 2020-06-20 09:12:55Z

3

If you have PHP 5.5+, then there is actually a built-in function that can do this! It's called array_column.

$newArray = array_column($yourArray, 'Username', 'User_ID');

DEMO: https://eval.in/182109

If you have a version of PHP lower than 5.5, then you can include this in your code to shim array_column in: https://github.com/ramsey/array_column

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Aug 22, 2014 at 15:03

gen_Eric

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4 Comments

Funk Forty Niner Over a year ago

Sweet. Now why didn't they think of that earlier? ;)

gen_Eric Over a year ago

@Fred-ii-: Because they wanted you to use a crazy mishmash of array_map and array_combine (or just a foreach) :-D

Funk Forty Niner Over a year ago

Their crazy little minds are constantly at work ;) Giving us better functions to work with later on, while eagerly waiting this happens (while) sipping Espressos and eating danishes at our favorite Café/Bistro.

Shaazaam Over a year ago

I guess I don't have PHP5.5, but the little shim you provided worked. I will keep the array_column in mind for the future. Thank you.

Community · Accepted Answer · 2017-05-23 12:05:02Z

3

For PHP versions < 5.5 or lacking the shim described by Rocket Hazmat, this will convert your array in to the necessary format:

<?php
$originalArray= array(
    0 => array(
        'User_ID' => 1,
        'Username' => 'A NAME'
    ),
    1 => array(
        'User_ID' => 2,
        'Username' => 'ANOTHER NAME'
    )
);

$newArray = array();
foreach ($originalArray as $element)
{
    $newArray[$element['User_ID']] = $element['Username'];
}
?>

edited May 23, 2017 at 12:05

CommunityBot

11 silver badge

answered Aug 22, 2014 at 15:07

George Cummins

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