Verify Googlebot with PHP

Posted on August 29, 2009, 4:06 PM, by Nitesh, under PHP.

Webmasters maynot be pleased if the content they want to be available to googlebot only is available to any users when they switch their user-agent to Googlebot. But webmaster can easily trackdown this diguised visits.

Here is a simple function in php to verify if the visit claiming to be from Googlebot is a true Googlebot visit.

  1. <?php
  2. function googleBot()
  3. {
  4.  
  5. if(preg_match("/Googlebot/",$_SERVER[‘HTTP_USER_AGENT’]))
  6. {
  7. //robot ip address is assigned to $ipaddress
  8. $ipaddress = $_SERVER[‘REMOTE_ADDR’];
  9.  
  10. //hostname is assigned to $hostname
  11. $hostname = gethostbyaddr($ipaddress);
  12.  
  13. if(preg_match("/googlebot.com/",$hostname))
  14. {
  15. // returns true if googlebot.com is found in hostname
  16. return true;
  17. }
  18. }
  19. return false;
  20. }

This function returns boolean true or false and can be used anywhere in your program to show wanted behavior.

The article is based on Verifying Googlebot

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One Comment

  1. Subash Chandra Poudel says:
    November 7, 2009 at 11:30 AM

    Great info. Thanks for the info.

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