class DB_Class {
    public $connection;

    function __construct() {
        $this->connection = new mysqli(DB_SERVER, DB_USERNAME, DB_PASSWORD, DB_DATABASE);

        if ($this->connection->connect_error) {
            die('Oops connection error -> ' . $this->connection->connect_error);
        }

        $this->connection->set_charset("utf8");
    }
}
?>
<br />
<b>Fatal error</b>:  Uncaught ArgumentCountError: Too few arguments to function User::__construct(), 0 passed in /home/admin/domains/siamtechno.ac.th/public_html/event/signin.php on line 14 and exactly 1 expected in /home/admin/domains/siamtechno.ac.th/public_html/event/include/functions.php:9
Stack trace:
#0 /home/admin/domains/siamtechno.ac.th/public_html/event/signin.php(14): User-&gt;__construct()
#1 {main}
  thrown in <b>/home/admin/domains/siamtechno.ac.th/public_html/event/include/functions.php</b> on line <b>9</b><br />