Updated User.session.php

I have added some more functions in the user.session.php file. Those codes are below. check it out bro.

    /*
    * Authorize function have has 4 level of checks 
        1.Check that the IP and User agent field is filled.
        2.Check if the session is correct and active.
        3.Check that the current IP is the same as the previous IP
        4.Check that the current user agent is the same as the previous user agent

        @return true else false;
    */
    public static function authorize($token)
    {
        try {
            $session = new UserSession($token);
            if (isset($_SERVER['REMOTE_ADDR']) and isset($_SERVER["HTTP_USER_AGENT"])) {
                if ($session->isValid() and $session->isActive()) {
                    if ($_SERVER['REMOTE_ADDR'] == $session->getIP()) {
                        if ($_SERVER['HTTP_USER_AGENT'] == $session->getUserAgent()) {
                            return true;
                        } else throw new Exception("User agent does't match");
                    } else throw new Exception("IP does't match");
                } else {
                    $session->removeSession();
                    throw new Exception("Invalid session");
                }
            } else throw new Exception("IP and User_agent is null");
        } catch (Exception $e) {
            return false;
        }
    }

    public function __construct($token)
    {
        $this->conn = Database::getConnection();
        $this->token = $token;
        $this->data = null;
        $sql = "SELECT * FROM `session` WHERE `token`='$token' LIMIT 1";
        $result = $this->conn->query($sql);
        if ($result->num_rows) {
            $row = $result->fetch_assoc();
            $this->data = $row;
            $this->uid = $row['uid']; //Updating this from database
        } else {
            throw new Exception("Session is invalid.");
        }
    }

    public function getUser()
    {
        return new User($this->uid);
    }

    /**
     * Check if the validity of the session is within one hour, else it inactive.
     *
     * @return boolean
     */
    public function isValid()
    {
        if (isset($this->data['login_time'])) {
            $login_time = DateTime::createFromFormat('Y-m-d H:i:s', $this->data['login_time']);
            if (3600 > time() - $login_time->getTimestamp()) {
                return true;
            } else {
                return false;
            }
        } else throw new Exception("login time is null");
    }

    public function getIP()
    {
        return isset($this->data["ip"]) ? $this->data["ip"] : false;
    }

    public function getUserAgent()
    {
        return isset($this->data["user_agent"]) ? $this->data["user_agent"] : false;
    }

    public function deactivate()
    {
        if (!$this->conn)
            $this->conn = Database::getConnection();
        $sql = "UPDATE `session` SET `active` = 0 WHERE `uid`=$this->uid";

        return $this->conn->query($sql) ? true : false;
    }

    public function isActive()
    {
        if (isset($this->data['active'])) {
            return $this->data['active'] ? true : false;
        }
    }

    //This function remove current session
    public function removeSession()
    {
        if (isset($this->data['id'])) {
            $id = $this->data['id'];
            if (!$this->conn) $this->conn = Database::getConnection();
            $sql = "DELETE FROM `session` WHERE `id` = $id;";
            if ($this->conn->query($sql)) {
                return true;
            } else return false;
        }
    }