I\'m having two arrays as follows:
$user_ids = Array
(
    [0] => 159a8a6f1c00c5c4d5d0daaab2aa4227
    [1] => a39777761f7816031aec676c80c3a8ad
    [2] =>         
        
You're close. Since both arrays contain an even amount of values, you can get the $key while looping the elements as such:
 $user_ids = explode(',', $request['items']);
  $user_statuses = explode(',', $request['user_status']);
  $count = 0;
  foreach ($user_ids as $key => $user_id) {
    // $key contains the number between the brackets
      if($user_statuses[$key]=='disable') {
        $objAdminUsers->UpdateUserStatus($user_id, $user_statuses[$key]); 
    $count++;
      }
    }
  }
This way you don't need a second foreach loop but you simply read the other array simultaneously