This filter tries to set the user culture by reading the domain part of the url. I use it for SEO, giving a different domain for each lang of my site.

Add this to your settings.yml :

    domain_culture:
       fr:   [.net, .fr, fr.mydomain.info]
       it:   [it.mydomain.info]
       en:   [.co.uk, .com, .mydomain.info]
 

Order is important : first match will assign the corresponding culture.

Create a lib/filters/domainCultureFilter.class.php file :

<?php
 
class domainCultureFilter extends sfFilter
{
    public function execute($filterChain)
    {
        $user = $this->getContext()->getUser();
        $request = $this->getContext()->getRequest();
        if (!$request->getParameter('sf_culture'))
        {
            if ($user->getAttribute('first_request', true))
            {
                $user->setAttribute('first_request', false);
                $domainCulture=sfConfig::get('sf_domain_culture');
                foreach ((array)$domainCulture as $culture=>$domains)
                {
                    foreach ((array)$domains as $domain)
                    {
                        $pattern = '/'.$domain.'/';
                        if (preg_match( $pattern ,  $_SERVER['HTTP_HOST']) )
                        {
                            $user->setCulture($culture);
                        }
                        break 2;
                    }
                }
            }
        }
        // Execute next filter
        $filterChain->execute();
    }
}
 

Add the filter to filters.yml :

# insert your own filters here
culture:
   class: domainCultureFilter
 

Comments are very welcome.