{{indexmenu_n>20}}

====== Canonical alias (SUMA) ======

**Blanks doubled content to avoid it and then shows the preferred version of the URL during indexing.**


Goolge placed a new Metatag for the search engines: <link rel="canonical", which avoids double content and shows a preferred version of an indexed URL. In large sitemap.php the webmaster tools often shows dozens of doubly indicated pages. Often pages are indexed with the category ID, then with a category alias or with index.php? + article ID´s at the same time. The contents is always the same.


Explaining link: 
[[http://googlewebmastercentral.blogspot.com/2009/02/specify-your-canonical.html]]
----

**rt_canonical_alias** V1.0  03.03.09  

Docu: -- \\
Forum: [[http://forum.phpwcms.org/viewtopic.php?p=114312#p114312]]


**Autor:**  K.Heermann (flip-flop) http://planmatrix.de \\
**CMS Version:** >= 1.3 \\ 
**Version:** V1.0 \\

 

Tag: -- \\

Filename: **rt_canonical_alias.php** 

Folder:  ** template/inc_script/frontend_render/ ** 

**Condition:** -> [[http://www.phpwcms-docu.de/config_dateien.phtml|/config/phpwcms/conf.inc.php]] \\

  * ##$phpwcms['allow_ext_render'] = 1;## 


----
----


<code php |h rt_canonical_alias |h >
<?php
/* ================================================================
03.03.2008 (KH) flip-flop
Output: <link rel="canonical" href="index.php?{CATEGORY_ALIAS}" />

Filename: rt_canonical_alias.php
Folder:   /template/inc_script/frontend_render/
Switch:   $phpwcms['allow_ext_render'] = 1; (/config/phpwcms/conf.inc.php)

Forum:   http://forum.phpwcms.org/viewtopic.php?p=114327#p114327
   ================================================================ */
// ----------------------------------------------------------------
// obligate check for phpwcms constants
if (!defined('PHPWCMS_ROOT')) {
   die("You Cannot Access This Script Directly, Have a Nice Day."); }
// ----------------------------------------------------------------

$block['custom_htmlhead']['index.php']   = '  <link rel="canonical" href="index.php?'.$content["struct"][$content["cat_id"]]["acat_alias"].'" />';
// -----------[ CLOSE ]----------------
?>
</code>