Array merge and removal of duplicate values - php

Question

I have this foreach loop that outputs the below array, and I'm having a senior moment, I need it to return one array with no duplicate values, and I just can't it right.
foreach ( $post_groups as $post_group => $id ) {
group = $wpdb->get_row( $wpdb->prepare("SELECT * FROM $table_name WHERE ID = %d", $id), ARRAY_A);
$groups[$group['group_name']] = $group['group_name'] = unserialize( $group['group_users'] );
}
output:
array(2) {
["Registered Users"]=>
array(1) {
[0]=>
string(1) "2"
}
["Admin Users"]=>
array(2) {
[0]=>
string(1) "1"
[1]=>
string(1) "2"
}
}
Cheers

Answer 1

I believe the following is what you're after. Simply merge the arrays together and then ensure the result is unique.
$userIds = [
'Registered Users' => array(1,2,3),
'Admin Users' => array(3,4,5),
];
$allUserIds = array_unique(call_user_func_array('array_merge', $userIds));
var_dump($userIds);
/*
array(2) {
["Registered Users"]=>
array(3) {
[0]=>
int(1)
[1]=>
int(2)
[2]=>
int(3)
}
["Admin Users"]=>
array(3) {
[0]=>
int(3)
[1]=>
int(4)
[2]=>
int(5)
}
}
*/
var_dump($allUserIds);
/*
array(5) {
[0]=>
int(1)
[1]=>
int(2)
[2]=>
int(3)
[4]=>
int(4)
[5]=>
int(5)
}
*/

Answer 2

Use to php functions : array_unique(array_merge())
test code:
$userIds = array('RegisteredUsers' => array('A','a','b','B'),'AdminUsers' => array('C','c','B','d','a'));
$allUserIds = array_unique(array_merge($userIds['RegisteredUsers'], $userIds['AdminUsers']));
echo "<br><br>";
var_dump($userIds);
var_dump($allUserIds);