public function fingerprint($raw = false){
		$option = $this->getip(1);
		if(isset($_SERVER["HTTP_USER_AGENT"]))
			$option .= $_SERVER["HTTP_USER_AGENT"];
		if(isset($_SERVER["HTTP_ACCEPT"]))
			$option .= $_SERVER["HTTP_ACCEPT"];
		if(isset($_SERVER["HTTP_ACCEPT_LANGUAGE"]))
			$option .= $_SERVER["HTTP_ACCEPT_LANGUAGE"];
		if(isset($_SERVER["HTTP_ACCEPT_CHARSET"]))
			$option .= $_SERVER["HTTP_ACCEPT_CHARSET"];
		
		return md5($option, ($raw ? true : false));
	}