Creating custom permalink structure for languages

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I’ve written a simple multi-language system, whereby clicking on a flag icon sets a one year cookie containing a two letter language code (e.g. nl, de, etc).

I hook into the wp action to read the cookie value, then use the the_title and the_content filters to show the correct language (the different languages are entered via metaboxes on the page/post edit screen).

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This all works great except I’d also like to have permalinks for each language version whereby the two letter language code is between the domain name and the usual permalink structure. I’m using the %postname% permalink structure, so all the following would be valid: 

http://example.com/nl/about-us
http://example.com/de
http://example.com/fr/2012/03
http://example.com/es/this-is-a-post-title

If the current language is English, then no two letter code should be used (it will just be the normal permalink).

So far I have used the query_vars filter to add a query var called lang, but that’s sa far a I’ve got, I’m unsure what the next steps are. Any advice much appreciated!

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2 comments

  1. Your question is complicated enough to answer by myself, but I would suggest you to install qTranslate plugin. As the plugin’s description says:

    Choose one of 3 Modes to make your URLs pretty and SEO-friendly. – The
    everywhere compatible ?lang=en, simple and beautiful /en/foo/ or nice
    and neat en.yoursite.com

    So you can try to inspect the plugin’s code and see how they do it, or just use it at all.

  2. This is the filter I’m using:

    function em_wpml_dbem_taxonomy_category_slug($option){
$lang = get_bloginfo('language');

if( $lang === 'es-ES' ){
    $option = 'eventos/categorias';
} else {
    $option = 'events/categories';
}
return $option;
}
add_filter('pre_option_dbem_taxonomy_category_slug', 'em_wpml_dbem_taxonomy_category_slug');