In this example, the has_access function is being used to check whether the current user has access to the admin dashboard. If the user does have access, the admin dashboard will be displayed. If the user does not have access, they will be redirected to the homepage. The specific package and library used for the has_access function can vary depending on the authentication system being used. However, popular authentication libraries in PHP include Laravel's authentication system, Symfony's authentication system, and the PHP Authorization with JWT tutorial.