Merging Arrays With the Same Keys

Merging arrays with the same keys

Try with array_merge_recursive

$A = array('a' => 1, 'b' => 2, 'c' => 3);
$B = array('c' => 4, 'd'=> 5);
$c = array_merge_recursive($A,$B);

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

will return

Array
(
    [a] => 1
    [b] => 2
    [c] => Array
        (
            [0] => 3
            [1] => 4
        )

    [d] => 5
)

Merging two PHP arrays with same numeric key

You can try below code to merge array. Code generates desired output required to you. I have used sample array as given by you:

<?php
    $arr1=array(
        "384"=>array("name"=>"SomeMovieName1","age"=>"12.2 hrs","IMDBLink"=>"","IMDBRating"=>"", "coverArt"=>""),
        "452"=>array("name"=>"SomeMovieName2","age"=>"15.2 hrs","IMDBLink"=>"","IMDBRating"=>"", "coverArt"=>""),
        "954"=>array("name"=>"SomeMovieName3","age"=>"4.2 hrs","IMDBLink"=>"","IMDBRating"=>"", "coverArt"=>"")
    );
    $arr2=array(
       "384" => array("IMDBLink" => "7.2", "IMDBRating" => "http://www.imdb.com/LinkToMovie1", "coverArt" => "http://www.SomeLinkToCoverArt.com/1"),
       "452" => array("IMDBLink" => "5","IMDBRating" => "http://www.imdb.com/LinkToMovie2", "coverArt" => "http://www.SomeLinkToCoverArt.com/2"),
       "954"=>array("IMDBLink" => "8","IMDBRating" => "http://www.imdb.com/LinkToMovie3", "coverArt" => "http://www.SomeLinkToCoverArt.com/3")
    );
    $arr3 = array();
    foreach($arr1 as $key=>$val)
    {
         $arr3[] = array_merge($val, $arr2[$key]);
    }
    echo "<pre>";
    print_r($arr3);
?>

Combining values from two arrays with same keys

If you can guarantee these two arrays will always have the same keys:

$arr3 = array();
foreach ($arr1 as $key => $val1) {
  $val2 = $arr2[$key];
  $arr3[$key] = $val1 . "-" . $val2;
}

Now, assuming the two have different keys and you want to do a "joined" array with only the keys that exist in both arrays:

$arr3 = array();
foreach (array_intersect(array_keys($arr1), array_keys($arr2)) as $key) {
  $arr3[$key] = $arr1[$key] . "-" . $arr2[$key];
}

This is similar to a SQL inner join.

If you want to do a "joined" array with the keys in either of the arrays, hyphen-joining only the ones that exist in both:

$arr3 = array();
foreach (array_merge(array_keys($arr1), array_keys($arr2)) as $key) {
  if (isset($arr1[$key]) && isset($arr2[$key])) {
    $arr3[$key] = $arr1[$key] . "-" . $arr2[$key];
  } else {
    $arr3[$key] = (isset($arr1[$key]) ? $arr1[$key] : $arr2[$key]);
  }
}

This is similar to a SQL outer join.

Try all of the above online!

How to merge two arrays and sum the values of duplicate keys?

I think the problem is simpler than it looks. You really only need a conditional to preclude undefined offset notices. Just iterate all keys and values in both arrays and add the values to the corresponding key in the merged array.

foreach ([$a1, $a2] as $a) {                             // iterate both arrays
    foreach ($a as $key => $value) {                     // iterate all keys+values
        $merged[$key] = $value + ($merged[$key] ?? 0);   // merge and add
    }
}

Really, the line that actually does the addition ($merged[$key] = $value + ($merged[$key] ?? 0);) could be reduced to $merged[$key] += $value;. That would still work, but it would produce a bunch of undefined offset notices. So instead we can set the key equal to the value plus either the previous value (if it exists) or zero.

If you're still using PHP 5, you can use a ternary instead of the null coalescing operator (??), like this:

$merged[$key] = $value + (isset($merged[$key]) ? $merged[$key] : 0);

The output won't be in the same order shown in your desired result, but you can use ksort($merged); to accomplish that

Merging couple different arrays with same keys into one array

If you want merge two records in single array take one array variable and change your loop as below.

$skus = [];
foreach($apiS->sku as $skuname=>$skuvalue) {
  $skus[$skuname]['promotion_price'] =  $skuvalue->price->priceText;
  $skus[$skuname]['quantity'] =  $skuvalue->quantity;
}
foreach($apiD->sku as $skuname=>$skuvalue) {
  $skus[$skuname]['price'] = $skuvalue->price->priceText;
}

Merge arrays under same key

You can use the following :

map(to_entries) | add | group_by(.key) | map({ key: (.[0].key), value:([.[].value | add]) }) | from_entries

Try it here.

map(to_entries) change each of your files into an array of key/value pairs.

add merge those two arrays into one.

group_by(.key) changes the content of the array into multiple arrays that regroup the objects with the same key.

map({ key: (.[0].key), value:([.[].value | add]) }) transforms those arrays into an object with a key/value pair whose key is the original key and the value is the merged values of the different objects with that key.

from_entries recreates an object from the array of key/value objects.

Merge two arrays of objects with the same keys in JavaScript

Your third try [arr1, arr2] was really close to a right answer, you can use the new spread syntax (...) to concat the arrays by doing to following:

const arr1 = [{ label: "one", value: "one", type: "arr1" }];
const arr2 = [{ label: "two", value: "two", type: "arr1" }];

console.log([...arr1, ...arr2]);

// array_column will conveniently rekey when the second argument is null
$array1 = array_column($array1, null, 'code');
$array2 = array_column($array2, null, 'model');

// array_map is a more complicated way to extract a column from an array
// and array_combine will do the rekeying
$array1 = array_combine(
              array_map(function($i) { return $i['code']; }, $array1),
              $array1);
$array2 = array_combine(
              array_map(function($i) { return $i['model']; }, $array2),
              $array2);

$result = array_merge_recursive($array1, $array2);