semoga bener

<!---
awalannya sudah salah sebenarnya.. tetapi saya juga salah kl memperbaiki seperti ini
at least jalan.. tp ini bukan solusi ya..
--->
connect.php
<?php

class database
{
    var $host;
    var $user;
    var $password;
    var $db_name;
    var $mysqli;

    public function __construct($new_host, $new_user, $new_password, $new_db_name)
    {
        $this->host     = $new_host;
        $this->user     = $new_user;
        $this->password = $new_password;
        $this->db_name  = $new_db_name;

        $mysqli = new mysqli($host, $user, $password, $db_name);
        if($mysqli->connect_error)
        {
            die("Terjadi kesalahan");
            exit;
        }else{
            return $mysqli;

        }
    }
}

?>

instantiate.php
<?php
function instantiate()
{
    $database = new database('localhost', 'root', '', 'tickit');
}
?>

user.php
<?php
require 'functions/instantiate.php';

class user
{
    var $username;
    private $password;
    var $email;
    var $firstname;
    var $lasname;
    var $address;
    var $town;
    var $country;
    var $postcode;

    private $repeat_password;

    private $query;


    function register($new_username, $new_password, $new_repeat_password, $new_email, $new_firstname, $new_lastname, $new_address, $new_town, $new_country, $new_postcode)
    {
        $this->username         = $new_username;
        $this->password         = $new_password;
        $this->repeat_password  = $new_repeat_password;
        $this->email            = $new_email;
        $this->firstname        = $new_firstname;
        $this->lasname          = $new_lastname;
        $this->address          = $new_address;
        $this->town             = $new_town;
        $this->country          = $new_country;
        $this->postcode         = $new_postcode;

        $database = new database('localhost', 'root', '', 'tickit');
        $selectUser = $database->prepare("SELECT username FROM user WHERE username=?");
        $selectUser->bind_param('s', $this->username);
        $selectUser->execute();
        $selectUser->store_result();

        if(!$selectUser->num_rows)
        {
            if($this->password === $this->repeat_password)
            {
                $inputUser = $mysqli->prepare("INSERT INTO user VALUES(?,?,?,?,?,?,?,?,?)");
                $inputUser->bind_param('sssssssss', $this->username, $this->password, $this->email, $this->firstname, $this->lastname, $this->address, $this->town, $this->country, $this->postcode);
                if($inputUser->execute())
                {
                    header("location:login.php");
                }
                else
                {
                    "Ada kesalahan saat mendaftar.";
                }
            }
            else
            {
                echo "Password tidak sama.";
            }
        }
        else
        {
            echo "Username tersebut sudah dipakai.";
        }
    }
}

?>