<?PHP

class DBconnect
{

    private $host   = "";
    private $username = "";
    private $password = "";
    private $database = "";

    private $mysqli;

    protected function connect()
    {
        $this->mysqli = new mysqli($this->host, $this->username, $this->password, $this->database) or die(mysql_error());

        return $this->mysqli;

    }

    protected function close()
    {
        $this->mysqli->close();
    }

}

?>