phpbb3 login integration

Hi,
I am working off a source, though I am re-making it a bit so it works a bit better..

Check the sources at the end as well.

<?php
define('IN_PHPBB', true);
$phpbb_root_path = '/home/user/public_html/forum/'; // Needs a trailing Slash!
$phpEx = substr(strrchr(__FILE__, '.'), 1);
include($phpbb_root_path . 'common.' . $phpEx);
// Start session management
$user->session_begin();
$auth->acl($user->data);
$user->setup();
?>

Thats just the basic bit, I'll get to the login form in a minute, now heres what we need to use to do a bit of checking:

<?php
if(!$user->data['is_registered']) {
    if ($user->data['user_id'] != ANONYMOUS) {
        trigger_error('NOT_AUTHORISED');
    }

    login_box('', $user->lang['NOT_AUTHORISED']);
}
// Or..

if($user->data['is_registered']) {
     echo 'Welcome ' . $user->data['username'];
} else {
     exit();
}
?>

A bit of HTML for the login form:
<form method="post" action="forum/ucp.php?mode=login">
<label for="username">Username: </label> <input type="text" name="username" id="username" size="40" /><br /><br />
<label for="password">Password: </label><input type="password" name="password" id="password" size="40" /><br /><br />
<label for="autologin">Remember Me?: </label><input type="checkbox" name="autologin" id="autologin"  /><br /><br />
<input type="submit" value="Log In" name="login" />
<input type="hidden" name="redirect" value="../index.php" />
</form>


Here is a little script that was called action.php:
<?php
define('IN_PHPBB', true);
$phpbb_root_path = '../forum/';
$phpEx = substr(strrchr(__FILE__, '.'), 1);
include($phpbb_root_path . 'common.' . $phpEx);
 
// Start session management
$user->session_begin();
$auth->acl($user->data);
$user->setup();

if($user->data['is_registered'])
{
    echo "Welcome " . $user->data['username']; //User is already logged in
}
else if(isset($_POST['login']))
{
    $username = request_var('username', '', true);
    $password = request_var('password', '', true);
    $autologin = (!empty($_POST['autologin'])) ? true : false;

    $result = $auth->login($username, $password, $autologin);

    if ($result['status'] == LOGIN_SUCCESS)
    {
        //User was successfully logged into phpBB
        $redirect = request_var('redirect', "{$phpbb_root_path}index.$phpEx");

        // append/replace SID
        $redirect = reapply_sid($redirect);

        meta_refresh(0, $redirect);
        trigger_error('You have been logged in');
    }
    else
    {
        echo 'Bad Login ' . $username; //User's login failed
    }
}
else
{
    echo '
        Please log in:<br />
        <form method="POST" action="_SELF">
        <p>Username: <input type="text" name="username" size="40"><br />
        Password: <input type="password" name="password" size="40"><br />
        Remember Me?: <input type="checkbox" name="autologin"><br />
        <input type="submit" value="Submit" name="login"></p>
        </form>';
}
?>

Sources:
http://forum.websitebaker2.org/index.php?topic=10222.0
http://www.phpbb.com/community/viewtopic.php?f=46&t=643075