August 2000
Intermediate to advanced
800 pages
13h 15m
English
Content preview from Core PHP Programming: Using PHP to Build Dynamic Web SitesBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Random Identifiers
If you ever need to track users through a site, you will need to assign unique identifiers. In a database you can store all the information you know about the user and pass the identifier from page to page either through links or with cookies. You will have to generate these identifiers randomly, otherwise it is too easy for anyone to masquerade as a legitimate user. Fortunately, random identifiers are easy to generate.
Listing 15.11 illustrates how this works. A pool of characters to use in the session identifier is defined. Characters are picked randomly from the list to build a session identifier of the specified length. That identifier is used inside a link so that it is passed to the next page. This method works for any ...
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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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.