Merge PHP array having same keys different values - php

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
)
)

Answer 1

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])