News Feed
Jobs 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

phpPatterns.com: Creating XUL applications with PHP

Brian Nelson's Blog: Writing A Reverse Proxy in PHP5

Chris Jones: Offline Processing in PHP with Advanced Queuing

DevShed: Unit Testing

Zend Developer Zone: AJAX Chat Tutorial Pt 5: Javascript, Sending Chat Messages, Screen Name Changes


Community Events











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


language unittest overview database symfony2 opinion composer security hhvm component performance release application introduction framework facebook podcast package hack install

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