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do you really need to use subdomain/subfolder?
i think in PHP, most browser sends HTTP_ACCEPT_LANGUAGE to indicate what locale the surfer is in
$locale = Locale::acceptFromHttp($_SERVER['HTTP_ACCEPT_LANGUAGE']);
echo $locale; // returns "en_US"
then just use that to detect the correct language pack to use.
a common practice is to have a dropdown in the menu, so that users can choose what language to view the contents (and store that in cookie for their future visit)
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