function LanguageNegotiationBrowser::getLangcode

Overrides LanguageNegotiationMethodInterface::getLangcode

File

core/modules/language/src/Plugin/LanguageNegotiation/LanguageNegotiationBrowser.php, line 49

Class

LanguageNegotiationBrowser

Class for identifying language from the browser Accept-language HTTP header.

Namespace

Drupal\language\Plugin\LanguageNegotiation

Code

public function getLangcode(?Request $request = NULL) {
    $langcode = NULL;
    if ($this->languageManager && $request && $request->server
        ->get('HTTP_ACCEPT_LANGUAGE')) {
        $http_accept_language = $request->server
            ->get('HTTP_ACCEPT_LANGUAGE');
        $langcodes = array_keys($this->languageManager
            ->getLanguages());
        $mappings = $this->config
            ->get('language.mappings')
            ->get('map');
        $langcode = UserAgent::getBestMatchingLangcode($http_accept_language, $langcodes, $mappings);
    }
    // Internal page cache with multiple languages and browser negotiation
    // could lead to wrong cached sites. Therefore disabling the internal page
    // cache.
    // @todo Solve more elegantly in https://www.drupal.org/node/2430335.
    $this->pageCacheKillSwitch
        ->trigger();
    return $langcode;
}