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how to put canonical tag on wordpress category page?

Hey,

does anybody know how to put a canonical tag on wordpress blog category page?

currently the urls are like below, which is creating a duplicate content issues in webmaster tool...

site.com/blog/category/name1
site.com/blog/category/name2
and so on..

These all urls have same meta title and content, I think putting canonical on this page should resolve the problem?

Thanks
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david_php
Asked:
david_php
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1 Solution
 
jeremyjared74Commented:
To ensure that every page uses a unique URL, you should put this code after the opening <header> tag and before it closes:
<?php 
    if ( is_singular() ) 
    echo '<link rel="canonical" href="' . get_permalink() . '" />'; 
?>

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There may be additional steps required depending on your permalink settings or the .htaccess file (if you;re on Linux Server, and it's being utilized).
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david_phpAuthor Commented:
sorry where exactly? in which file? and i think if i add this code manually, then it will be overwritten whenever blog is upgraded next time?
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jeremyjared74Commented:
It would go in the header.php file. Notice where I said

"To ensure that every page uses a unique URL, you should put this code after the opening <header> tag and before it closes:"


You can create a child theme to avoid it being over-written. To create a child theme you only need to create two files for now, the header.php file and a style.css file.

The style.css file would require this in the top of the file:
/* 
Theme Name: Conanical
Theme URI: http://www.yoursite.com/
Description: Not Required
Author: YOU
Author URI: Your URL
Template: twentyten
Version: 1.1
Tags: fixed
*/

/*Nothing required here, but is the optimal place for making edits to CSS so it doesn't get overwritten.*/

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Just be sure to replace twentyten with the exact theme name for your current theme.

The header.php file would be your header.php copied and pasted into the new file. Then replace the code between the <title>THE CODE I SHOW ABOVE GOES HERE</title>. Save the file as header.php. Now create a folder and name it whatever. Place both the new files in this folder and upload it to the theme directory. Activate the theme. Now changes won't be overwritten.
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jeremyjared74Commented:
CORRECTION:


The code doesn't go in the title tags, it goes just after the closing </title> tag.
EXAMPLE:
<title>SOME TITLE STUFF HERE</title>
<?php 
    if ( is_singular() ) 
    echo '<link rel="canonical" href="' . get_permalink() . '" />'; 
?>

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david_phpAuthor Commented:
it din't work, any idea why?
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jeremyjared74Commented:
How are your permalinks structured? If you go to Settings>Permalinks, what do you have them set to?
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david_phpAuthor Commented:
custom structure = /%postname%/
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jeremyjared74Commented:
I'm not sure why it's not working for you. Maybe you are better off going with a plug-in. All in One SEO is a very good Plug-in. It will help with more than your titles.
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jeremyjared74Commented:
Try this for the title tag in the header.php file:
<title><?php if (is_home() ) { 
  bloginfo( 'name' ); 
  }
elseif (is_category( ) ) { 
  single_cat_title( ) ; echo ' - ' ; 
  bloginfo( 'name' ) ; 
  }
elseif (is_single() ) { 
  single_post_title() ; 
  }
elseif (is_page( ) ) { 
  bloginfo('name' ) ; echo ' : ' ; 
  single_post_title() ; 
  } else { 
  wp_title( '' , true ); 
  } 
?></title>

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gwkgCommented:
It didn't work because jeremy inadvertently used is_singular() instead of is_category().

That said, I don't think using a canonical link is a solution.  You need to make unique titles and descriptions for each category.

I prefer the SEO Plugin from Yoast.com http://yoast.com/wordpress/canonical/ 
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david_phpAuthor Commented:
ok thanks
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