connect arrays into one - php

Question

How i can transform this first array [ONE}: Into second array [TWO} where i can call meta_key and than i get var: i get this array by calling specified sql rows and i am using this query: $user_data = $wpdb->get_results("SELECT * FROM $wpdb->usermeta WHERE user_id = $fivesdraft->user_id "); maybe its another better way to connect it in query? not in PHP
Array ONE
(
[0] => stdClass Object
(
[umeta_id] => 16
[user_id] => 2
[meta_key] => nickname
[meta_value] => user1
)
[1] => stdClass Object
(
[umeta_id] => 17
[user_id] => 2
[meta_key] => first_name
[meta_value] => testname
)
[2] => stdClass Object
(
[umeta_id] => 18
[user_id] => 2
[meta_key] => last_name
[meta_value] => testlastname
)
[3] => stdClass Object
(
[umeta_id] => 19
[user_id] => 2
[meta_key] => description
[meta_value] => user desc
)
)
Array TWO
(
[nickname] => 'user1'
[first_name] => 'user desc'
[last_name] => 'user desc'
[description] => 'user desc'
...
)

Answer 1

You can use array_reduce:
$myArray = array_reduce($arrayOne, function ($result, $item) {
$result[$item->meta_key] = $item->meta_value;
return $result;
}, array());

Answer 2

Just loop over the array and write the values in a new array
$two = array();
foreach ($one as $item) {
$two[$item->meta_key] = $item->meta_value;
}