function isAdmin() { if(isset($_SESSION['user_role']) && $_SESSION['user_role'] == 'admin') { return true; } else { return false; } }In this code example, we are checking if the user's session variable 'user_role' is set and if it is equal to 'admin'. If it is, we return true, indicating that the user is an administrator. Otherwise, we return false. Package Library: The package library associated with this function could vary, as it could be implemented in any PHP application or framework that requires user authentication and authorization. It is important to ensure that proper security measures are in place to protect administrator privileges.