update_language_list

update_language_list($flags = LanguageInterface::STATE_CONFIGURABLE)

function update_language_list($flags = LanguageInterface::STATE_CONFIGURABLE) {

  $languages = &drupal_static(__FUNCTION__);

  // Initialize master language list.
  if (!isset($languages)) {
    // Initialize local language list cache.
    $languages = array();

    // Fill in master language list based on current configuration.
    $default = \Drupal::languageManager()->getDefaultLanguage();
    if (\Drupal::languageManager()->isMultilingual() || \Drupal::moduleHandler()->moduleExists('language')) {
      // Use language module configuration if available. We can not use
      // entity_load_multiple() because this breaks during updates.
      $language_entities = \Drupal::configFactory()->listAll('language.entity.');

      // Initialize default property so callers have an easy reference and can
      // save the same object without data loss.
      foreach ($language_entities as $langcode_config_name) {
        $langcode = substr($langcode_config_name, strlen('language.entity.'));
        $info = \Drupal::config($langcode_config_name)->get();
        $languages[$langcode] = new Language(array(
          'default' => ($info['id'] == $default->getId()),
          'name' => $info['label'],
          'id' => $info['id'],
          'direction' => $info['direction'],
          'locked' => $info['locked'],
          'weight' => $info['weight'],
        ));
      }
      Language::sort($languages);
    }
    else {
      // No language module, so use the default language only.
      $languages = array($default->getId() => $default);
      // Add the special languages, they will be filtered later if needed.
      $languages += \Drupal::languageManager()->getDefaultLockedLanguages($default->getWeight());
    }
  }

  // Filter the full list of languages based on the value of the $all flag. By
  // default we remove the locked languages, but the caller may request for
  // those languages to be added as well.
  $filtered_languages = array();

  // Add the site's default language if flagged as allowed value.
  if ($flags & LanguageInterface::STATE_SITE_DEFAULT) {
    $default = \Drupal::languageManager()->getDefaultLanguage();
    // Rename the default language.
    $default->setName(t("Site's default language (@lang_name)", array('@lang_name' => $default->getName())));
    $filtered_languages[LanguageInterface::LANGCODE_SITE_DEFAULT] = $default;
  }

  foreach ($languages as $langcode => $language) {
    if (($language->isLocked() && !($flags & LanguageInterface::STATE_LOCKED)) || (!$language->isLocked() && !($flags & LanguageInterface::STATE_CONFIGURABLE))) {
      continue;
    }
    $filtered_languages[$langcode] = $language;
  }

  return $filtered_languages;
}