php 判断来访是否是搜索引擎蜘蛛

这篇文章主要介绍了PHP判断来访是搜索引擎蜘蛛还是普通用户的代码小结，多种方法总有一种适合你，防止搜索引擎蜘蛛拖死搜索引擎，可以在备案是使用，具体效果如何有待测试，以前有写过一篇《备案不关站的小方法分享：js+css隐藏首页内容即可》也可以参考一下。下面说说今天的主题，代码如下：

<?php 
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！"; }?>