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PHP and MySQL for Dynamic Web Sites: Visual QuickPro Guide, Fourth Edition by Larry Ullman

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12. Cookies and Sessions

In This Chapter

Making a Login Page 368

Making the Login Functions 371

Using Cookies 376

Using Sessions 388

Improving Session Security 396

Review and Pursue 400

The Hypertext Transfer Protocol (HTTP) is a stateless technology, meaning that each individual HTML page is an unrelated entity. HTTP has no method for tracking users or retaining variables as a person traverses a site. Without the server being able to track a user, there can be no shopping carts or custom Web-site personalization. Using a server-side technology like PHP, you can overcome the statelessness of the Web. The two best PHP tools for this purpose are cookies and sessions.

The key difference between cookies and sessions is that cookies store data in ...

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