asd

        public function UserIsLogged()
        {
            if (isset($_SESSION['user_id'], $_SESSION['username'], $_SESSION['login_string']))
            {
                $user_id = $_SESSION['user_id'];
                $login_string = $_SESSION['login_string'];
                $username = $_SESSION['username'];
                $user_hash = hash('sha512', $username . $user_id);
                if ($stmt = $this->db->prepare("SELECT pass FROM users WHERE id = ? LIMIT 1"))
                {
                    $stmt->bindParam(1, $user_id,PDO::PARAM_INT);
                    $stmt->execute();
                    if ($stmt->rowCount() == 1)
                    {
                        while($row=$stmt->fetch())
                        {
                            $password = $row['pass'];
                            $login_check = hash('sha512', $password . $user_hash);
                            if ($login_check == $login_string)
                                return true;
                            else return false;
                        }
                    }
                    else
                        return false;
                }
                else
                    return false;
            }
            else
                return false;
        }