PHP merge associative arrays with duplicate keys - php

Question

I have an array like this:
$array1 = [
['State'=>'Utah', 'users'=>5],
['State'=>'California', 'users'=>10]
]
$array2 = [
['State'=>'Utah', 'emails'=>18],
['State'=>'Arizona', 'emails'=>32],
['State'=>'California', 'emails'=>28],
]
How would I merge them so that it will become like this:
$mergedArray = [
['State'=>'Utah', 'users'=>5, 'emails'=>18],
['State'=>'Arizona', 'emails'=>32],
['State'=>'California', 'users'=>10, 'emails'=>28]
]
I tried array_merge but it only kept data from the first array.
Edit: Notice how the length and order of the array can be different.

Answer 1

Use array_replace_recursive function:
$array1 = ['Utah'=>['users'=>5],'California'=>['users'=>10]];
$array2 = ['Utah'=>['emails'=>18],'California'=>['emails'=>28]];
$result = array_replace_recursive($array1, $array2);
print_r($result);
The output:
Array
(
[Utah] => Array
(
[users] => 5
[emails] => 18
)
[California] => Array
(
[users] => 10
[emails] => 28
)
)
Update:
Though you have changed your initial requirements I also have solution for your new input data.Used functions: array_merge and array_values
// user data
$array1 = [
['State'=>'Utah', 'users'=>5],
['State'=>'California', 'users'=>10]
];
// email data
$array2 = [
['State'=>'Utah', 'emails'=>18],
['State'=>'Arizona', 'emails'=>32],
['State'=>'California', 'emails'=>28],
];
$result = [];
foreach (array_merge($array1, $array2) as $item) {
if (isset($result[$item['State']])) {
$result[$item['State']] = array_merge($result[$item['State']], $item);
} else {
$result[$item['State']] = $item;
}
}
$result = array_values($result);
print_r($result);
The output:
Array
(
[0] => Array
(
[State] => Utah
[users] => 5
[emails] => 18
)
[1] => Array
(
[State] => California
[users] => 10
[emails] => 28
)
[2] => Array
(
[State] => Arizona
[emails] => 32
)
)