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PHP for the Web: Visual QuickStart Guide, Fourth Edition by Larry Ullman

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9. Cookies and Sessions

Chapter 8, “Creating Web Applications,” covered a number of techniques for developing more fully realized Web sites. One missing piece—the focus of this chapter—is how to maintain “state” as the user traverses a multipage Web site. The Hypertext Transfer Protocol (HTTP) is a stateless technology, meaning that it has no built-in method for tracking a user or remembering data from one page of an application to the next. This is a serious problem, because e-commerce ...

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