function check_user()
{
   $phpbb_root_path = 'forum/'; 
   require_once($phpbb_root_path . 'extension.inc'); 
   require_once($phpbb_root_path . 'common.'.$phpEx); 
   $userdata = session_pagestart($user_ip, PAGE_INDEX); 
   init_userprefs($userdata); 
 
    if($userdata['session_logged_in'])
        return true;
    else
        return false;  
}