class DB {
  private static $db;
  public static function connect() {
    if (!self::$db) {
      self::$db = new mysqli("localhost","arownao7wqn_beopayx","arownao7wqn_beopayx","arownao7wqn_beopayx");
      self::$db->set_charset("utf8mb4");
    }
    return self::$db;
  }
}