  JohnCMS "CanonicalPage"
: 1.0b
: Krite ( http://johncms.com )
       
<link rel="canonical" href="  "/>
      .
      Yandex  Google      ,     .
   JohnCMS   , 
forum/index.php, forum/index.php?page=1, forum/index.php?start=0 -     forum/
 ..

 :
   .
  .
     head.php,
       head.php  <head></head>

if(!$user_id) {
	require($rootpath . 'incfiles/canonical.php');
	$canonical = new Canonical($kmess, $home);
}

P.s.      mode rewrite  .