News Feed
Sections




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

Codewalkers.com:
Creating a CAPTCHA with PHP
June 07, 2006 @ 05:58:57

Codewalkers.com has a new tutorial posted today showing the creation of a CAPTCHA image with PHP.

You may be thinking just exactly what is a captcha? Well you are likely to have already seen them across the web. They are those little images with a code on the front that you type into a box in order to submit something. This kind of system helps to prevent automatic submitting of an operation by some kind of program or robot. In this tutorial I will show you how to make a CAPTCHA [just like the one below]. Its not the most advanced captcha available because it uses a simple system font and nothing more.

They start with a look at how CAPTCHAs work before even looking at the code. The next steps include the creation of the random string of characters and placing them in the image (with a standard background in this case). The image is built with the GD functionality in PHP. Finally, they add the functionality in, checking a session variable, to ensure that the user has inputted the text from the image correctly.

1 comment voice your opinion now!
captcha tutorial image gd session png captcha tutorial image gd session png


blog comments powered by Disqus

Similar Posts

Jeremy Cook's Blog: Installing Imagick under Apache on Windows

DevShed: Understanding Static Properties with PHP 5

DevShed: File Security and Resources with PHP

Josh Holmes' Blog: Zend SimpleCloud and Azure

DZone.com: How to send emails from PHP on Windows


Community Events





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


language laravel tips interview opinion community zendserver update framework release library introduction list install deployment series api symfony package podcast

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