Merge PHP array having same keys different values

Question

I am trying to merge arrays with the same keys with different values, like below.

Input:

$array1 = array('1933' => array(
    'nid' => '492811',
    'title' => 'NEW TITLE',
    'field_link_single_url' => 'abc',
    'field_link_single_title' => 'test' 
    ));
    
$array2 = array('1933' => array(
    'nid' => '492811',
    'title' => 'NEW TITLE',
    'field_link_single_url' => 'xyz',
    'field_link_single_title' => 'abcd' 
    ));

Expected output to be:

Array
(
    [nid] => 492811
    [title] => NEW TITLE
    [field_link_single_url] => [
          [0] => 'abc',
          [1] => 'xyz'
    ]
    [field_link_single_title] => [
          [0] => 'test',
          [1] => 'abcd'
    ]
)

I have tried array_merge and array_merge_recursive but it does not work as expected.

Output of array_merge_recursive($array1[1933], $array2[1933]) it is creating duplicates keys having same value

Array
(
    [nid] => Array
        (
            [0] => 492811
            [1] => 492811
        )

    [title] => Array
        (
            [0] => Hal  Louchheim
            [1] => Hal  Louchheim
        )

    [field_link_single_url] => Array
        (
            [0] => abc
            [1] => xyz
        )

    [field_link_single_title] => Array
        (
            [0] => test
            [1] => abcd
        )

)

Is that a typo? array_merge_recursive should do what you need — Andy Holmes
– Andy Holmes, Commented Aug 19, 2020 at 14:45
It is possible to use array_merge_recursive if you would leave first level of tree (with key "1933"). As long as you need to keep this structure there is not native one-line function and you have to write your own function and iterate it by your own. — Jax-p
– Jax-p, Commented Aug 19, 2020 at 14:50

gbalduzzi · Accepted Answer · 2020-08-19 14:56:41Z

2

I made some assumption. If these assumptions are not valid, you should add some additional checks:

Both $array1 and $array2 are really arrays
Both $array1 and $array2 have the exact same keys
The values inside $array1 and $array2 are primitive types, not complex objects (the === operator would not work to compare objects or arrays)

function mergeArrayValues($array1, $array2) {
  $output = [];
  foreach($array1 as $key => $value) {
    $output[$key] = $array1[$key] === $array2[$key] 
       ? $array1[$key]
       : [ $array1[$key], $array2[$key] ]
  }
  return $output;
}

mergeArrayValues($array1[1933], $array2[1933])

answered Aug 19, 2020 at 14:56

gbalduzzi

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