class DBconn {

    var $host = 'localhost';
    var $user = 'user';
    var $pass = 'password';
    var $db = 'database';

    function connectdb() {

        $conn = @mysqli_connect($this->host, $this->user, $this->pass, $this->db);
        if(!$conn) {
            echo "There has been an error with the application: " . mysqli_error($conn);
        }

    }

}