The uFlex class can be used to manage registrations and authenticate users with records in a MySQL database. It can perform several types of operations with registered users of a site. Currently, it can create or update registered user records, activate user accounts, reset passwords, authenticate a user and start a login session, end a login session, and automatically login. As its name implies, the class is very flexible as you can add, modify, and validate any field in the registration and updating process.
Swiftlet is a lightweight Web application framework written in PHP. It enables you to quickly deploy Web sites that are fast and secure. Swiftlet is extensible, flexible, and doesn't get in your way. Swiftlet requires zero configuration and has few conventions to which you must adhere. Swiftlet has all the features you would expect from a modern Web application framework. It implements the Model-View-Controller (MVC) architecture pattern to separate logic from design and takes advantage of the Object-Oriented Programming (OOP) capabilities of PHP 5.