Merge two multidimensional arrays in PHP

Question

Supposing I've this array:

Array
(
    [country] => Array
        (
            [0] => France
            [1] => Canada
        )
    [capital] => Array
        (
            [0] => Paris
            [1] => Ottawa
        )
    [other] => value
)

Is it possible to merge the country and capital arrays ?

The desired output is the following:

Array
(
    [countries] => Array
        (
            Array 
                (
                    [country] => France
                    [capital] => Paris
            )
            Array 
                (
                    [country] => Canada
                    [capital] => Ottawa
            )
        )
    [other] => value
)

What I tried:

$result = array();

foreach($arr as $key=>$array) {
    $result[$key] = array_merge($array, $arr2[$key]);
}

What about the [other] => value? how do you know which field to combine? — dWinder
– dWinder, Commented May 30, 2019 at 12:21
@dWinder, [other] => value should remain in the new array. For how to combine, the value should be merged in the key order. So the first of country should go with the first of capital... — Thomas
– Thomas, Commented May 30, 2019 at 12:23

dWinder · Accepted Answer · 2019-05-30 12:46:56Z

1

If you have known field to modify use:

$arr = ["country" => ["France", "Canada"], "capital" => ["Paris", "Ottawa"], "other" => "value"];
$keys = ["country", "capital"];

foreach($arr as $k => $v) {
    if (in_array($k, $keys)) {
        $slice[] = $v; // get the array which need to be merge
        unset($arr[$k]); // remove him from the original array
    }
}

$arr["countries"] = array_map(function ($e) use ($keys) {return array_combine($keys, $e);}, array_map(null, ...$slice));

And now $arr is set.

Notice the use of ... operator to explode the $slice array and the array_map with null which combine according to int keys.

This is the most generic way because if you want to change the field to merge you only need to do so in 1 place...

edited May 30, 2019 at 12:46

answered May 30, 2019 at 12:24

dWinder

11.7k3 gold badges27 silver badges40 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Thomas Over a year ago

What's the difference with your first approach ?

dWinder Over a year ago

Now the code is more generic - in the first post I used the country and capital string 3 times

Vitalii · Accepted Answer · 2019-05-30 12:24:28Z

1

If countries -> capitals keys and length are the same and you need only those values to be combined you can simply increment through one of arrays. For example:

$result = ['countries' => [], 'other' => $arr['other']];
for ($i = 0; $i < count($arr['country']); $i++) {
    $result['countries'][] = [
        'country' => $arr['country'][$i],
        'capital' => $arr['capital'][$i]
    ];
}

answered May 30, 2019 at 12:24

Vitalii

1,17514 silver badges25 bronze badges

Comments

Vamshi Rockzz · Accepted Answer · 2019-05-30 12:29:42Z

0

Try to use below code it will works 100%

thank you.

<?php

$arr = [
    "country"=>["France","Canada"],
    "capital"=>["Paris","Ottawa"],
    "other"=>[]
];


$result = [
    "countries"=>[]
];

for($i=0;$i<count($arr["country"]);$i++){
    $data = [
        "country"=>$arr["country"][$i],
        "capital"=>$arr["capital"][$i]
    ];
    array_push($result["countries"],$data);
}


echo "<pre>";
print_r($result);
echo "</pre>";

answered May 30, 2019 at 12:29

Vamshi Rockzz

716 bronze badges

Collectives™ on Stack Overflow

Merge two multidimensional arrays in PHP

3 Answers 3

2 Comments

Comments

Comments

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

2 Comments

Comments

Comments

Related