in Application\Module.php
public function onBootstrap(MvcEvent $e) {
$translator = $e->getApplication()->getServiceManager()->get('translator');
$lang = $e->getRequest()->getQuery('lang'); // new language
$session = new Container('base');
if($lang == null && $lang == ''){
if ($session->offsetExists('lang')) {
$lang = $session->offsetGet('lang'); // current language
}else{
$lang = Settings::DEFAULT_LANGUAGE; // default language
}
}
$session->offsetSet('lang', $lang);
$loc = Settings::$locations[$lang];
$translator
->setLocale($loc)
->setFallbackLocale(Settings::DEFAULT_LANGUAGE .'_' . Settings::DEFAULT_LOCATION);
}
and Settings class
class Settings{
const DEFAULT_LOCATION = 'IR';
const DEFAULT_LANGUAGE = 'fa';
public static $locations = array(
'fa'=>'fa_IR',
'sa'=>'sa_SA',//Arabic (sa, sa-SA)
'tr'=>'tr_TR',
'en'=>'en_US'
);
}