PHP屏蔽蜘蛛访问代码及常用搜索引擎的HTTP_USER_AGENT

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

    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; 
    }

下面的php代码附带了更多的蜘蛛标识

    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！"; 
    }

使用PHP实现蜘蛛访问日志统计

    $useragent = addslashes(strtolower($_SERVER['HTTP_USER_AGENT']));

     if (strpos($useragent, 'googlebot')!== false){$bot = 'Google';}
     elseif (strpos($useragent,'mediapartners-google') !== false){$bot = 'Google Adsense';}
     elseif (strpos($useragent,'baiduspider') !== false){$bot = 'Baidu';}
     elseif (strpos($useragent,'sogou spider') !== false){$bot = 'Sogou';}
     elseif (strpos($useragent,'sogou web') !== false){$bot = 'Sogou web';}
     elseif (strpos($useragent,'sosospider') !== false){$bot = 'SOSO';}
     elseif (strpos($useragent,'360spider') !== false){$bot = '360Spider';}
     elseif (strpos($useragent,'yahoo') !== false){$bot = 'Yahoo';}
     elseif (strpos($useragent,'msn') !== false){$bot = 'MSN';}
     elseif (strpos($useragent,'msnbot') !== false){$bot = 'msnbot';}
     elseif (strpos($useragent,'sohu') !== false){$bot = 'Sohu';}
     elseif (strpos($useragent,'yodaoBot') !== false){$bot = 'Yodao';}
     elseif (strpos($useragent,'twiceler') !== false){$bot = 'Twiceler';}
     elseif (strpos($useragent,'ia_archiver') !== false){$bot = 'Alexa_';}
     elseif (strpos($useragent,'iaarchiver') !== false){$bot = 'Alexa';}
     elseif (strpos($useragent,'slurp') !== false){$bot = '雅虎';}
     elseif (strpos($useragent,'bot') !== false){$bot = '其它蜘蛛';}
     if(isset($bot)){
       $fp = @fopen('bot.txt','a');
       fwrite($fp,date('Y-m-d H:i:s')."\t".$_SERVER["REMOTE_ADDR"]."\t".$bot."\t".'http://'.$_SERVER['SERVER_NAME'].$_SERVER["REQUEST_URI"]."\r\n");
       fclose($fp);
     }