How can I directly log in into phpBB3 from my website?

I integrated phpbb3 into my site.When a user login into my website then there is a tab called forum. If he clicks on the forum it will take to a page where it asking user name and password to login. But 开发者_StackOverflowi want when the user clicks on the forum then he has to directly go to forum with his account details without logging again.

Please help me......

I actually did this exact same thing, A user registers on my site and at the same time i would automaticaly create them a phpbb account as well.

Here is the code I use to register them (I don't use the phphash function for passwords, I use my hash functions. The md5 hash for the password is actually hashing a already hashed password):

//Register the user on the forum code

global $phpbb_root_path, $phpEx, $user, $db, $config, $cache, $template,$auth;             

 define('IN_PHPBB', true);
$phpbb_root_path = (defined('PHPBB_ROOT_PATH')) ? PHPBB_ROOT_PATH : './Forums/';
$phpEx = substr(strrchr(__FILE__, '.'), 1);
include($phpbb_root_path . 'common.' . $phpEx);
require('./Forums/includes/functions_user.php');

// Start session management
$user->session_begin();
$auth->acl($user->data);
$user->setup('viewtopic');

$user_row = array(
     'username'                => $username,                //REQUIRED IN FORM
     'user_password'           => md5($password_1),            //REQUIRED IN FORM
     'user_email'              => $email,            //REQUIRED IN FORM
     'group_id'                => 2,//(int) $group_id,
     'user_timezone'           => $timezone = date(Z) / 3600,//(float) $data[tz],
     'user_dst'                => date(I),//$is_dst,
     'user_lang'               => $user->lang_name,//$data[lang],
     'user_type'               => USER_NORMAL,//$user_type,
     'user_actkey'             => '',//$user_actkey,
     'user_ip'                 => $user->ip,
     'user_regdate'            => time(),
     'user_inactive_reason'    => 0,//$user_inactive_reason,
     'user_inactive_time'      => 0,//$user_inactive_time,
);


 //Register user on the forum
 $forum_user_id = user_add($user_row);

 return "both_registered";

Then to log them in I use this:

//Now log them into the forum
global $phpbb_root_path, $phpEx, $user, $db, $config, $cache, $template, $auth;             

define('IN_PHPBB', true);
$phpbb_root_path = (defined('PHPBB_ROOT_PATH')) ? PHPBB_ROOT_PATH : getcwd().'/Forums/';
$phpEx = substr(strrchr(__FILE__, '.'), 1);
include($phpbb_root_path . 'common.' . $phpEx);
require(getcwd().'/Forums/includes/functions_user.php');

// Start session management
$user->session_begin();
$auth->acl($user->data);
$user->setup();

// Begin phpBB login
if(!$user->data['is_registered'])
{
  $username = $username;
  $password = $password;
  $autologin = 1;

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

Obviously you might need to change this around a little, I do alot of checks before it even gets to registering them or logging them in. Hopefully this helps and if anyone sees something i am not doing right then please let me know.