Performs language negotiation.

@todo Determine whether string|false or string|null should be the normalized result across all implementations and update the

Parameters

\Symfony\Component\HttpFoundation\Request $request: (optional) The current request. Defaults to NULL if it has not been initialized yet.

Return value

string|null|false A valid language code if the negotiation was successful and either NULL or FALSE otherwise.

and its comment accordingly.

Overrides LanguageNegotiationMethodInterface::getLangcode

File

core/modules/user/src/Plugin/LanguageNegotiation/LanguageNegotiationUserAdmin.php, line 102

Class

LanguageNegotiationUserAdmin

Identifies admin language from the user preferences.

Namespace

Drupal\user\Plugin\LanguageNegotiation

Code

public function getLangcode(?Request $request = NULL) {
  $langcode = NULL;
  // User preference (only for administrators).
  if (($this->currentUser
    ->hasPermission('access administration pages') || $this->currentUser
    ->hasPermission('view the administration theme')) && ($preferred_admin_langcode = $this->currentUser
    ->getPreferredAdminLangcode(FALSE)) && $this->isAdminPath($request)) {
    $langcode = $preferred_admin_langcode;
  }
  // Not an admin, no admin language preference or not on an admin path.
  return $langcode;
}

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