Source Interação com XenForo / Sistema de Login com XenForo

<?php
define('FORUM_ROOT', 'https://website.net/forum/'); // Seu site
define('XF_ROOT', './.');
class CXenforo
{
    function __construct(){       
        require_once(XF_ROOT . '/library/XenForo/Autoloader.php');   
        XenForo_Autoloader::getInstance()->setupAutoloader(XF_ROOT . '/library');
        XenForo_Application::initialize(XF_ROOT . '/library', XF_ROOT);
        XenForo_Application::set('page_start_time', TIMENOW);
    }
 
    public function sessionUsername(){
  
            $dependencies = new XenForo_Dependencies_Public();
            $dependencies->preLoadData();
            XenForo_Session::startPublicSession();
            $visitor = XenForo_Visitor::getInstance();
            return ($visitor->username);   
    }
    public function xf_userinfo(){
  
        $userModel = XenForo_Model::create('XenForo_Model_User');
        $criteria = array(
        'user_group_id' => array (1,2,3,4,5)
        );
        $options = array(
        'join' => XenForo_Model_User::FETCH_USER_FULL,
        'order' => 'user_id'
        );
    return  $userModel->getModelFromCache('XenForo_Model_User')->getUsers($criteria, $options);   
    }   
  
    public function xf_login($user, $pass){
  
        $db = XenForo_Application::getDb();
        $data = $db->fetchOne('SELECT auth.data FROM xf_user_authenticate AS auth INNER
        JOIN xf_user AS user ON (user.user_id = auth.user_id) WHERE user.username = ?', $user);
        $auth = XenForo_Authentication_Abstract::createDefault();
        $auth->setData($data);
        $check = $auth->authenticate($user, $pass);
        return $check;
    }
 
    public function userGroupID($usuario){
  
        $userModel = XenForo_Model::create('XenForo_Model_User');
        $user = $userModel->getUserByName($usuario);
        return $user['user_group_id'];
    }
    public function getUser_Info($username,$param)
    {
        $userModel = XenForo_Model::create('XenForo_Model_User');
        $user = $userModel->getUserByName($username);
        return $user[$param];   
    }
 
    public function getUser_Avatar($username, $size){
  
        $userModel = XenForo_Model::create('XenForo_Model_User');
        $user = $userModel->getUserByName($username);
        $group = floor($user['user_id'] / 1000);
        if($user[avatar_date] == 0)
            return FORUM_ROOT . "styles/default/xenforo/avatars/avatar_s.png";
        else
            return FORUM_ROOT . XenForo_Application::$externalDataUrl . "/avatars/$size/$group/$user[user_id].jpg?$user[avatar_date]";
    }
}
?>