PHP - Concatenate values of 2 arrays into 1 new array

Question

I have 2 separate multidimensional arrays that have the same structure. Example:

Array
(
    [0] => Array
        (
            [uploadData] => 1234 Main St
        )

    [1] => Array
        (
            [uploadData] => 5678 Elm St
        )

    [2] => Array
        (
            [uploadData] => 9879 New St
        )

    [3] => Array
        (
            [uploadData] => 9876 Shady Lane
        )

)

Array
(
    [0] => Array
        (
            [uploadData] => Orlando
        )

    [1] => Array
        (
            [uploadData] => Tampa
        )

    [2] => Array
        (
            [uploadData] => Miami
        )

    [3] => Array
        (
            [uploadData] => West Palm Beach
        )

)

I just need to get them into 1 new array that looks like this:

Array
(
    [0] => Array
        (
            [uploadData] => 1234 Main St Orlando
        )

    [1] => Array
        (
            [uploadData] => 5678 Elm St Tampa
        )

    [2] => Array
        (
            [uploadData] => 9879 New St Miami
        )

    [3] => Array
        (
            [uploadData] => 9876 Shady Lane West Palm Beach
        )

)

I've been trying to use array_merge but I cannot get it to work.

You're going to have to build a custom function to do this. Have you tried that yet? — Benjam
– Benjam, Commented Dec 20, 2012 at 23:06
No, I was not 100% sure what built in functions I should even be using. Trying to figure that out now. — Sequenzia
– Sequenzia, Commented Dec 20, 2012 at 23:08

dev-null-dweller · Accepted Answer · 2012-12-20 23:36:24Z

3

Simple, recursive, key-independent solution:

function array_concat_recursive($array1, $array2){
    $result = array();
    foreach($array1 as $key => $value){
        if(isset($array2[$key])){
            if(is_array($value)){
                $result[$key] = array_concat_recursive($value, $array2[$key]);
            }else{
                $result[$key] = $value . ' ' . $array2[$key];
            }
        }
    }
    return $result;
}

answered Dec 20, 2012 at 23:36

dev-null-dweller

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Comments

Benjam · Accepted Answer · 2012-12-20 23:27:13Z

2

Assuming that:

Your first array is assigned to a variable called $address
Your second array is assigned to a variable called $city
There are ALWAYS exact matches between the two arrays

EDIT:
Great catch by @dev-null-dweller - edited to catch full depth of arrays.

NOTE
Example code in question does not have quotes around uploadData key, so that is replicated here:

The following will do what you want:

foreach($address as $key=>$value) {
    $newarray = array(
         'uploadData'=>$value['uploadData'] . ' ' . $city[$key]['uploadData'];
    );
}

The $newarray will contain an array structured per your request.

edited Dec 20, 2012 at 23:27

Benjam

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answered Dec 20, 2012 at 23:09

random_user_name

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4 Comments

dev-null-dweller Over a year ago

Nope, you are missing one level of arrays. As it is now it will trigger warnings and result in array full of entries like Array Array

Sequenzia Over a year ago

Thanks cale_b. Your assumptions are correct but dev-null-dweller is right I got a bunch of - [0] => Array Array [1] => Array Array [2] => Array Array [3] => Array Array

mpen Over a year ago

Huh? You're just re-assigning $newarray over and over again... You want to do $newarray[] = and you need to initialize it before the loop.

Sequenzia Over a year ago

Yeah I ended up with an array with just the values from the last row. Thanks for the help though

hakre · Accepted Answer · 2012-12-20 23:40:41Z

1

Fetch from both arrays until everything is gone:

$final = [];
$key   = 'uploadData';
while ($array1 && $array2)
{
    $final[][$key] = array_shift($array1)[$key] . ' ' . array_shift($array2)[$key];
}

See array_shift and converting to booleans.

edited Dec 20, 2012 at 23:40

answered Dec 20, 2012 at 23:14

hakre

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4 Comments

dev-null-dweller Over a year ago

Nice way to alter array_merge with specific items order, but this not answer the questions, there is no concatenations of values here.

hakre Over a year ago

@dev-null-dweller: What do you mean? $final should be correct.

dev-null-dweller Over a year ago

no, for sample data posted by OP your final array will have 8 items, when only 4 are desired.

hakre Over a year ago

Ah, now seeing, well then my answer is totally wrong even. However, it can be quickly adopted. Edit: Done. Edit2: Demo: eval.in/5018

mickmackusa · Accepted Answer · 2023-12-20 22:09:33Z

0

Because the two arrays have the same size and there are no associative first level keys to preserve, they can be mapped together with array_map() and concatenated.

Code: (Demo)

$streets = [
    ['uploadData' => '1234 Main St'],
    ['uploadData' => '5678 Elm St'],
    ['uploadData' => '9879 New St'],
    ['uploadData' => '9876 Shady Lane'],
];

$cities = [
    ['uploadData' => 'Orlando'],
    ['uploadData' => 'Tampa'],
    ['uploadData' => 'Miami'],
    ['uploadData' => 'West Palm Beach'],
];

var_export(
    array_map(
        fn($s, $c) => ['uploadData' => "{$s['uploadData']} {$c['uploadData']}"],
        $streets,
        $cities
    )
);

answered Dec 20, 2023 at 22:09

mickmackusa♦

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