// Retrieve an instance of the context class $context = Context::getInstance(); // Set an authentication token in the context $context->set('auth_token', 'my_auth_token'); // Retrieve the authentication token from the context $auth_token = $context->get('auth_token');In this example, we retrieve an instance of the Context class using the Context::getInstance() method. We then set an authentication token in the context using the set() method and retrieve it using the get() method. It is difficult to determine the package library for this example code snippet as it does not provide enough information. However, the Context class is often used in web development frameworks such as Laravel and Symfony.