Hook the language switcher and change the URLs it redirects to in Drupal 7 I have a multilanguage site in Drupal 7.

The language negotiation is based on URL. I have got translated content, so when I visit www.example.com/this-is-a-news in English, I can change to Spanish using the language switcher and go to www.example.com/esta-es-una-noticia, which is the URL of the translated node. However, I have some URLs which are dynamic, i.e., they are built in-the-fly, for example: www.example.com/this-is-a-news/on-the-fly-parameter...

As the part of the URL /on-the-fly-parameter is completely dynamic and can change, and because the translation is a non-Drupal table in the database which is updated independently, I want to hook the language switcher and add the translations of all of these URLs dynamically. How can I achieve this?
I have discovered how to do it. 

function MYTEMPLATE_language_switch_links_alter(array &amp;$links, $type, $path) {


 $extract_parameters_URL = explode("/", $_SERVER['REQUEST_URI']);

 $code_altered_url = process_URL_extracts($extract_parameters_URL);

 foreach ($links as $langcode =&gt; $link) {

    $links[$langcode]['href'] = $code_altered_url ;

 } // foreach