March 2002
Intermediate to advanced
592 pages
15h 52m
English
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Chapter 8. Sessions
A fundamental characteristic of the Web is the stateless interaction between browsers and web servers. As discussed in Chapter 1, HTTP is a stateless protocol. Each HTTP request a browser sends to a web server is independent of any other request. The stateless nature of HTTP allows users to browse the Web by following hypertext links and visiting pages in any order. HTTP also allows applications to distribute or even replicate content across multiple servers to balance the load generated by a high number of requests. These features are possible because of the stateless nature of HTTP.
This stateless nature suits applications that allow users to browse or search collections of documents. However, applications that require complex user interaction can’t be implemented as a series of unrelated, stateless web pages. An often-cited example is a shopping cart in which items are added to the cart while searching or browsing a catalog. The state of the shopping cart—the selected items—needs to be stored somewhere. When the user requests the order page, the items for that user need to be displayed.
Stateful web database applications can be built using sessions, and session management is the topic of this chapter. In this chapter we:
Discuss how sessions are managed in the stateless environment of the Web and introduce the three characteristics of server-side session management
Introduce cookies for storing state
Show how to use and configure the PHP session management ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.