/**
 * PHP判断来访者是否是搜索引擎的蜘蛛
 *
 * @param 
 * @arrange 512-笔记网： 512Pic.com
 **/
function is_crawler() { 
	$userAgent = strtolower($_SERVER['HTTP_USER_AGENT']); 
	$spiders = array( 
		'Googlebot',// Google 爬虫 
		'Baiduspider',// 百度爬虫 
		'Yahoo! Slurp',// 雅虎爬虫 
		'YodaoBot',// 有道爬虫 
		'msnbot' // Bing爬虫 
		// 更多爬虫关键字 
	); 
	foreach ($spiders as $spider) { 
		$spider = strtolower($spider); 
		if (strpos($userAgent,$spider) !== false) { 
			return true; 
		} 
	} 
	return false; 
}
/***   来自编程之家 jb51.cc（jb51.cc）   ***/

/**
 * PHP判断来访者是否是搜索引擎的蜘蛛
 *
 * @param 
 * @arrange 512-笔记网： 512Pic.com
 **/
function isCrawler() { 
echo $agent= strtolower($_SERVER['HTTP_USER_AGENT']); 
if (!empty($agent)) { 
$spiderSite= array( 
		"TencentTraveler","Baiduspider+","BaiduGame","Googlebot","msnbot","Sosospider+","Sogou web spider","ia_archiver","Yahoo! Slurp","YoudaoBot","Yahoo Slurp","MSNBot","Java (Often spam bot)","BaiDuSpider","Voila","Yandex bot","BSpider","twiceler","Sogou Spider","Speedy Spider","Google AdSense","Heritrix","Python-urllib","Alexa (IA Archiver)","Ask","Exabot","Custo","OutfoxBot/YodaoBot","yacy","SurveyBot","legs","lwp-trivial","Nutch","StackRambler","The web archive (IA Archiver)","Perl tool","MJ12bot","Netcraft","MSIECrawler","WGet tools","larbin","Fish search",); 
foreach($spiderSite as $val) { 
		$str = strtolower($val); 
		if (strpos($agent,$str) !== false) { 
				return true; 
		} 
} 
} else { 
return false; 
} 
} 
if  (isCrawler()){ 
echo "你好蜘蛛精！"; 
} 
else{ 
echo "你不是蜘蛛精啊！"; 
} 
/***   来自编程之家 jb51.cc（jb51.cc）   ***/