啥是机器人！

define('ISROBOT', getrobot());if(defined('NOROBOT') && ISROBOT) {	exit(header("HTTP/1.1 403 Forbidden"));}

function getrobot() {	if(!defined('IS_ROBOT')) {		$kw_spiders = 'Bot|Crawl|Spider|slurp|sohu-search|lycos|robozilla';		$kw_browsers = 'MSIE|Netscape|Opera|Konqueror|Mozilla';		if(preg_match("/($kw_browsers)/", $_SERVER['HTTP_USER_AGENT'])) {			define('IS_ROBOT', FALSE);		} elseif(preg_match("/($kw_spiders)/", $_SERVER['HTTP_USER_AGENT'])) {			define('IS_ROBOT', TRUE);		} else {			define('IS_ROBOT', FALSE);		}	}	return IS_ROBOT;}