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/**
*    判断是否为搜索引擎蜘蛛
*
*    @author    Eddy
*    @return    bool
*/
function isCrawler() {
        $agent= strtolower($_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;
        }
}