Role ID for anonymous users; should match what's in the "role" table.
in Drupal 8.0.0, will be removed before Drupal 9.0.0. Use Drupal\Core\Session\AccountInterface::ANONYMOUS_ROLE or \Drupal\user\RoleInterface::ANONYMOUS_ID instead.
const DRUPAL_ANONYMOUS_RID = AccountInterface::ANONYMOUS_ROLE;
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https://api.drupal.org/api/drupal/core!includes!bootstrap.inc/constant/DRUPAL_ANONYMOUS_RID/8.1.x