PHP屏蔽蜘蛛访问代码及常用搜索引擎的HTTP_USER_AGENT
屏蔽蜘蛛相信每一位站长都不希望这样做吧，因为蜘蛛的访问就没有用户的浏览，直接会给我们带来一定损失，不过也有例外，某些网站就不希望被蜘蛛爬行，接下来为你介绍屏蔽蜘蛛的php代码
PHP屏蔽蜘蛛访问代码代码：
常用搜索引擎名与 HTTP_USER_AGENT对应值
百度baiduspider
谷歌googlebot
搜狗sogou
腾讯SOSOsosospider
雅虎slurp
有道youdaobot
Bingbingbot
MSNmsnbot
Alexais_archiver
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