https://www.mrdocs.com/docs/mrdocs/reference/mrdocs/NamespaceSymbol/IsAnonymous.html
mrdocs::NamespaceSymbol::IsAnonymous :: Mr.Docs
mrdocsisanonymous
https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Session%21UserSession.php/function/UserSession%3A%3AisAnonymous/11.x
function UserSession::isAnonymous | Drupal API
functionusersessionisanonymousdrupalapi