Create a Function to Check If User Is a Bot/Spider

1. /* Is Bot
2. ------------------------------------------------------*/
3. function is_bot(){
4.  
5. $bot_list= array("Ask Jeeves","Baiduspider","Butterfly","FAST","Feedfetcher-Google","Firefly","Gigabot","Googlebot","InfoSeek","Me.dium","Mediapartners-Google","NationalDirectory","Rankivabot","Scooter","Slurp","Sogou web spider","Spade","TECNOSEEK","TechnoratiSnoop","Teoma","TweetmemeBot","Twiceler","Twitturls","URL_Spider_SQL","WebAlta Crawler","WebBug","WebFindBot","ZyBorg","alexa","appie","crawler","froogle","girafabot","inktomi","looksmart","msnbot","rabaz","www.galaxy.com");
6. $user_agent= $_SERVER["HTTP_USER_AGENT"];
7.  
8.  
9. foreach($bot_list as $bot){
10.  
11. if(strpos($user_agent,$bot)!== false){
12.  
13. return true;
14.  
15. }
16.  
17.  
18. return false;
19.  
20. }
21.  
22. }

Simply run the function is_bot, and the user's $_SERVER["HTTP_USER_AGENT"] will be run through a list of commonly-known bots and return true if there's a match!