News Feed
Sections




News Archive
Looking for more information on how to do PHP the right way? Check out PHP: The Right Way

Utah PHP Users Group:
PHP-CAPTCHA
July 13, 2006 @ 05:34:24

On the Utah PHP Users Group website today, there's a quick new tutorial concerning the creation of a CAPTCHA image for your site (using the GD functionality in PHP).

The following article includes code and examples on how to prevent bots from taking part in online polls, registering for free email accounts, more recently, preventing bot-generated spam by requiring that the (unrecognized) sender pass a CAPTCHA test before the email message is delivered [implemented in Yahoo]. They have also been used to prevent people from using bots to assist with massive downloading of content from multimedia websites.

First, they create the form the entire example centers around before even looking at the code. With that laid down and explained, they get into the image creation and addition of the string to make the "humans only" image. Finally, they show how to check the word entered for the CAPTCHA verification against a session variable to see if they're a match.

0 comments voice your opinion now!
captcha image tutorial form verification gd session captcha image tutorial form verification gd session


blog comments powered by Disqus

Similar Posts

IBM developerWorks: Understanding the Zend Framework, Part 3: The feeds

PHPFreaks.com: Sessions and cookies: Adding state to a stateless protocol

PHPFreaks.com: PHP Add Text To Image

Sanisoft Blog: Radio button issues while migrating from cakePHP-1.2alpha app to 1.2prebeta

Gonzalo Ayuso's Blog: Watermarks in our images with PHP and Gearman


Community Events





Don't see your event here?
Let us know!


release install introduction series configure experience language threedevsandamaybe community podcast framework refactor testing developer laravel unittest code opinion list interview

All content copyright, 2014 PHPDeveloper.org :: info@phpdeveloper.org - Powered by the Solar PHP Framework