December 2010
Intermediate to advanced
363 pages
12h 21m
English
book
Pro PHP Security: From Application Security Principles to the Implementation of XSS Defenses, Second Edition
by Chris Snyder, Michael Southwell, Thomas Myer
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Creating an Effective Captcha Test Using PHP
Given the complexity and difficulty of using advanced captcha techniques, we confine ourselves to using the simplest kind of visual captcha, which presents a nondistorted (or minimally distorted) image of a word to a user, who must enter that word into a form. Such a challenge is capable of being used effectively in the vast majority of situations, and is unlikely to exclude many legitimate users.
Let an External Web Service Manage the Captcha for You
There can be no question that the simplest way to use a captcha is to let someone else do all the work. We are now seeing commercial web services that, for a fee, will allow you to incorporate a captcha challenge based on their servers into your website. ...
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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.