Apart the interaction between the website and the user, predefined variables can provide key information about the server environment and the user. In this course, you’ll learn how to make your website more interactive. First, you’ll discover how to create more robust forms, leveraging sessions that span multiple pages of data. Next, you’ll explore the ability to save cookies. Finally, you’ll learn how to upload files and other form data, which utilize these predefined variables. When you’re finished with this course, you’ll have a stronger understanding of the PHP programming language, and have the ability to create more interactive websites with predefined variables.