如何区分Google Bot访问和Bing Bot访问

Question

I am planning to have 2 versions(A/B) of a page. If the visit comes from the Google Bot visit, the response should be the A version or If the visit comes from the Bing Bot visit, the response should be a the B version. How do I know if the visit is from the Google Bot or Bing Bot in PHP?

Thanks.

Answer 1

First figure out what the User Agent string is for the bots by going here: http://www.robotstxt.org/db.html

Next check the user agent using PHP:

if (strpos($_SERVER['HTTP_USER_AGENT'],"Googlebot")){
    //Show Page A 
}else if(strpos($_SERVER['HTTP_USER_AGENT'],"MSNBOT")){
    //Show Page B
}

But why? The bots are supposed to see what people see so they can index the site on the search engine.