Discuz是否搜索引擎蜘蛛

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

此函数来源于dz论坛程序. IS_ROBOT 被定义为一个常量.

IS_ROBOT?:'你是搜索引擎蜘蛛吧':'你是人';