doRegister.php #1 [Mike M. tutorial]

<?php
require("functions.class.php");
$functions = new functions;

@$username = strip_tags($_POST['username']);
@$password = strip_tags($_POST['password']);

/*WARNING LIST
1:Username and/or password might be empty
2:Username is not alphanumeric OR haven't got the correct length
3:Password haven't got the correct length, or does not contact a-z A-Z 0-9 ! @ # $ % ^ & *
4:Username already in use
5:Registration Failed
*/

//echo($functions->username_exists("admin"));
//echo($functions->receive_password("admin"));
//echo($functions->receive_salt("admin"));
//echo($functions->equal_password("admin","password"));

if(!empty($username) && !empty($password)){
    //username and password is filled in.
    if($functions->check_username($username) == true){
        //username is valid
        if($functions->check_password($password) == true){
            //password is valid
            if($functions->username_exists($username) == false){
                //remember this must be FALSE else the username already exists! <this is pretty much the only function that may return false in the register
                //username does not exist
                if($functions->register($username, $password) == true){
                    //username and password is registered
                    echo('<strong>Successfully Registered!</strong><br />You can now <a href="login.php">login</a>!');
                }else{
                    //username and password could not be registered.
                    header("Location: register.php?id=5");
                    echo("Reloading...");
                }
            }else{
                //username exists
                header("Location: register.php?id=4");
                echo("Reloading...");
            }
        }else{
            //password is invalid
            header("Location: register.php?id=3");
            echo("Reloading...");
        }
    }else{
        //username is invalid
        header("Location: register.php?id=2");
        echo("Reloading...");
    }
}else{
    header("Location: register.php?id=1");
    echo("Reloading...");
}

?>