// Assume we have a user object already created $user = new User(); // Add the user to the "admin" group $user->addGroup("admin");In this example, we assume that we have a user object already created and we want to add this user to the "admin" group. The addGroup method takes a single parameter, which is the name of the group you want to add the user to. This method is likely part of a larger package or library for managing user authentication and authorization in PHP. The specific library would depend on the project and developer preferences, but some popular options include Laravel's built-in authentication system, Symfony's security component, or even a custom solution built from scratch.