How can I hide the active language in the language switcher block?

Question

I have a site with two languages, but it's pointless to show the name of the currently selected language in the language switcher block. How can I hide it?

Answer 1

The links generated by the Language API are alterable via hook_language_switch_links_alter(), so you can do this:

/**
 * Implements hook_language_switch_links_alter().
 */
function MYMODULE_language_switch_links_alter(array &$links, $type, $path) {
  global $language;

  unset($links[$language->language]);
}

Answer 2

[Drupal 8]:

Implement hook_language_switch_links_alter in a custom module like this:

 /**
 * Perform alterations on language switcher links.
 *
 * A language switcher link may need to point to a different path or use a
 * translated link text before going through the link generator, which will
 * just handle the path aliases.
 *
 * @param array $links
 *   Nested array of links keyed by language code.
 * @param string $type
 *   The language type the links will switch.
 * @param \Drupal\Core\Url $url
 *   The URL the switch links will be relative to.
 */
function hook_language_switch_links_alter(array &$links, $type, \Drupal\Core\Url $url) {
  $language_interface = \Drupal::languageManager()->getCurrentLanguage();
  $current_language_id = $language_interface->getId();
  unset($links[$current_language_id]);
}