function register() {
        $connector = new dbConnector();
        foreach ($_POST as $key => $value) {
           $_POST[$key] = mysql_real_escape_string($value);
        }

        $user = $_POST['username'];
        $password = md5($_POST['password']);
        $email = $_POST['email'];
        $fname = $_POST['fname'];
        $lname = $_POST['lname'];
        $addr = $_POST['addr'];
        $number = $_POST['number'];

        if(empty($number)) {
            return -8;
        }
        if(empty($addr)) {
            return -7;
        }
        if(empty($lname)) {
            return -6;
        }
        if(empty($fname)) {
            return -5;
        }
        if(empty($email)) {
            return -4;
        }
        if(empty($user)) {
            return -3;
        }
        if(empty($password)) {
            return -2;
        }
        if($_POST['password'] != $_POST['password2']) {
            return -1;
        }

        $query = $connector->query("SELECT * FROM user WHERE username='" . $user . "'");
        $result = $connector->fetchArray($query);
        if(($connector->rows($query)) > 0){
            return 1;
        }
        else {
            $query = $connector->query("INSERT INTO users (username, password, fname, lname, address, phone) VALUES ('".$user."', '".$password."','".$fname."','".$lname."','".$address."','".$phone."'); ");
            return 0;
        }
    }