Update alert!

Thanks to some enterprising individuals seeking free advertising, a banning feature has been added to the guestbook.

Available to admins only, clicking the left-most icon removes the offending entry and adds the author's IP address to a banned list.



Furthermore, additions to the guestbook must originate from the guestbook page.  I'm rather proud of the software that tests for this.  Check it out...

$referrer = isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : null;

if(preg_replace("/^http://[-.0-9A-Z_a-z]+(.*?)/", "\\1", $referrer) == $_SERVER['PHP_SELF'])
{
  ...
}

I don't think I've ever seen a domain name with an underscore, but it's there anyway.