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This means that every request you make in a browser is anonymous in the sense that it is not tied to the previous request in any way.When you login to a website, the application must “remember” that you have logged in and you should be associated with an account.

Sessions are a critical component of creating dynamic websites or web applications.When you save data into the Session (such as being logged in), the Session will store that data into a file onto the server.The unique identifier is also stored as a cookie on the user’s computer.For newcomers to PHP—and those who feel in need of a refresher—Chapter 3 acts as a crash course in PHP basics.The first half of the chapter gives a high level overview of what you need to know before starting to handle PHP code.