Chapter 5. PHP and Sessions

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Sessions or state control are an important part of most web applications. Often you want to pass some information around during the life of a web application, such as a user ID. Many different PHP scripts in your web application might need that information. Such information is called session or state information. PHP also lets you pass such information back and forth to other web scripting languages such as ASP using a protocol called Web-Distributed Data eXchange (WDDX) if your web application is made up of different web scripting languages. WDDX is not limited to sharing session data. It can share any data between applications. This chapter looks first at how PHP handles session data and then at how PHP handles WDDX session data with ASP.

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