Pure-PHP language tag library, conforming to BCP-47

Usage

use LanguageTag\LanguageTag;

$canonicalForm = LanguageTag::fromRaw('zh-classical')->getCanonical();
print $canonicalForm;
# 'lzh'

$availablePageLanguages = array('zh', 'lzh');
$browserAcceptedLanguages = array('en', 'zh-classical', 'fr');
$renderLanguage = LanguageTag::lookupBestLang($browserAcceptedLanguages, $availablePageLanguages);
print $renderLanguage;
# 'lzh'