How to detect robots and spiders with PHP?

Here is the simple function for detecting spiders and robots. It will return true or false.

function is_bot(){     $bots = array(         'Googlebot',         'Baiduspider',         'ia_archiver',         'R6_FeedFetcher',         'NetcraftSurveyAgent',         'Sogou web spider',         'bingbot',         'Yahoo! Slurp',         'facebookexternalhit',         'PrintfulBot',         'msnbot',         'Twitterbot',         'UnwindFetchor',         'urlresolver',         'Butterfly',         'TweetmemeBot');      foreach($bots as $b){       if( stripos( $_SERVER['HTTP_USER_AGENT'], $b ) !== false ) return true;    }    return false; }

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