| public static extractLanguageAndRegionCodeFromBrowserLanguage ( string $browserLanguage, array $validLanguages = [] ) : string | ||
| $browserLanguage | string | Browser's accepted langauge header |
| $validLanguages | array | array of valid language codes. Note that if the array includes "fr" then it will consider all regional variants of this language valid, such as "fr-ca" etc. |
| return | string | 2 letter ISO 639 code 'es' (Spanish) or if found, includes the region as well: 'es-ar' |
public static function extractLanguageAndRegionCodeFromBrowserLanguage($browserLanguage, $validLanguages = array())
{
$validLanguages = self::checkValidLanguagesIsSet($validLanguages);
if (!preg_match_all('/(?:^|,)([a-z]{2,3})([-][a-z]{2})?/', $browserLanguage, $matches, PREG_SET_ORDER)) {
return self::LANGUAGE_CODE_INVALID;
}
foreach ($matches as $parts) {
$langIso639 = $parts[1];
if (empty($langIso639)) {
continue;
}
// If a region tag is found eg. "fr-ca"
if (count($parts) == 3) {
$regionIso3166 = $parts[2];
// eg. "-ca"
if (in_array($langIso639 . $regionIso3166, $validLanguages)) {
return $langIso639 . $regionIso3166;
}
if (in_array($langIso639, $validLanguages)) {
return $langIso639 . $regionIso3166;
}
}
// eg. "fr" or "es"
if (in_array($langIso639, $validLanguages)) {
return $langIso639;
}
}
return self::LANGUAGE_CODE_INVALID;
} /**
* For better privacy we store only the main language code, instead of the whole browser language string.
*
* @param $acceptLanguagesString
* @return string
*/
protected function getSingleLanguageFromAcceptedLanguages($acceptLanguagesString)
{
if (empty($acceptLanguagesString)) {
return '';
}
$languageCode = Common::extractLanguageAndRegionCodeFromBrowserLanguage($acceptLanguagesString);
return $languageCode;
}
