/**
* Get fallback chain for a given language.
*
* @param string $lang Language code
* @return string[] List of one or more language codes
*/
public function getLangFallbacks($lang)
{
if (self::$fallbackCache === null) {
// Lazy-initialize
self::$fallbackCache = $this->fetchLangFallbacks();
}
$lang = $this->normalizeLang($lang);
return isset(self::$fallbackCache[$lang]) ? self::$fallbackCache[$lang] : array('en');
}