function getUserType($username) { // Query the database or other source of user data // to determine the user's role, e.g.: $userRole = 'regular'; if ($username === 'admin') { $userRole = 'admin'; } // Return the user's role as a string return $userRole; }In this example, the function takes a parameter of the user's username and returns their role as either 'regular' or 'admin', depending on whether the username is 'admin' or not. This function can be used in various PHP applications like content management systems (CMS), e-commerce websites, forums, social networks, etc. It is not associated with any specific package or library, as it is a custom function that can be implemented by the developer. However, there are many PHP libraries and frameworks that provide similar functionality for user authentication and authorization, such as Symfony Security Component, Laravel Auth, CodeIgniter Authentication, etc.