gistfile1.php

<?php
class fooActions extends sfActions
{
  /**
   * Changes current user culture, and redirect the user to the translated doctrine 
   * route url he came from (especially useful when you have these pretty things 
   * called translated slugs in your I18nized doctrine models).
   *
   * PLEASE NOTE: it might be the most awful piece of code I ever produced, but... 
   * well, it works™
   *
   * @param  sfWebRequest  $request
   */
  public function executeChangeCulture(sfWebRequest $request)
  {
    $lang = $request->getParameter('lang', 'en');
    $redirect = '@homepage_culture?sf_culture='.$lang;
    $this->getUser()->setCulture($lang);
    
    // no referer available and we can't guess it? so we just change the user 
    // culture and redirect him to translated homepage
    if (!$referer = $request->getReferer())
    {
      $this->redirect($redirect);
    }

    // retrieve requested script name + path_info stripping protocol, domain and tld (omg)
    if (!$requestedUrl = substr($referer, strpos($referer, '/', 7)))
    {
      $this->redirect($redirect);
    }
    
    $requestedUrl = str_replace($_SERVER['SCRIPT_NAME'], '', $requestedUrl); // haha, scary
    $routing = $this->context->getRouting();
    $parameters = $routing->parse($requestedUrl);
    
    if (isset($parameters['_sf_route']))
    {
      $route = $parameters['_sf_route'];
      $routeName = $routing->getCurrentRouteName();
      if ($routeName && $route instanceof sfDoctrineRoute)
      {
        try
        {
          $object = $route->getObject();
        }
        catch (Exception $e)
        {
        }
        if (!$object instanceof Doctrine_Record)
        {
          break;
        }
        if ($object->getTable()->hasRelation('Translation'))
        {
          $translatedObject = $object->getTable()
            ->createQuery('o')
            ->leftJoin('o.Translation t WITH t.lang = ?', $lang)
            ->where('o.id = ?', $object->id)
            ->limit(1) // yeah, if you think I'm dumb have a look at code in Doctrine_Query::fetchOne()
            ->fetchOne()
          ;
          if ($translatedObject)
          {
            $redirect = $this->generateUrl($routeName, $translatedObject);
          }
        }
        else
        {
          $redirect = $this->generateUrl($routeName, $object);
        }
      }
    }
    else
    {
      $this->getUser()->setCulture($lang);
    
      $redirect = preg_replace(
        sprintf('`^(http|https)://([a-z\.]+)(/(\w)+_(dev|staging)\.php)?(/)?(%s)/?(.*)`', 
                implode('|', sfConfig::get('app_cultures_available', array('en')))), 
        sprintf('$1://$2$3/%s$6$8$9', $lang),
        $referer
      );
    
      if (preg_match(sprintf('#/%s/$#', $lang), $redirect))
      {
        $redirect = substr($redirect, 0, strlen($redirect) - 1);
      }
    }
    
    $this->redirect($redirect);
  }
}