SimpleSAML\Locale\Language::getDefaultLanguage PHP Method

    public function getDefaultLanguage()
    {
        return $this->defaultLanguage;
    }

 /**
  * Retrieve the preferred translation of a given text.
  *
  * @param array $translations The translations, as an associative array with language => text mappings.
  *
  * @return string The preferred translation.
  *
  * @throws \Exception If there's no suitable translation.
  */
 public function getPreferredTranslation($translations)
 {
     assert('is_array($translations)');
     // look up translation of tag in the selected language
     $selected_language = $this->language->getLanguage();
     if (array_key_exists($selected_language, $translations)) {
         return $translations[$selected_language];
     }
     // look up translation of tag in the default language
     $default_language = $this->language->getDefaultLanguage();
     if (array_key_exists($default_language, $translations)) {
         return $translations[$default_language];
     }
     // check for english translation
     if (array_key_exists('en', $translations)) {
         return $translations['en'];
     }
     // pick the first translation available
     if (count($translations) > 0) {
         $languages = array_keys($translations);
         return $translations[$languages[0]];
     }
     // we don't have anything to return
     throw new \Exception('Nothing to return from translation.');
 }