Blocking "Blocked Referrer' -- how to

Is there anyway to block Blocked Referrers from your site with htaccess?

 

you can do it with php easily

 

Could you point me in the right direction on how to do this?

 

You can use a regular expression to validate the Referer header.

preg_match(
  '/^(http|https|ftp):\/\/(([A-Z0-9][A-Z0-9_-]*)(\.[A-Z0-9][A-Z0-9_-]*)+)(:(\d+))?\//i',
  $_SERVER['HTTP_REFERER'],
  $captures
);
if (count($captures[0]) == 0) {
  exit('Sorry, you cannot access this page.');
}

PHP:

Note that you may also be blocking legitimate visitors, as user agents are not required to send the referrer header.

- P