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CodedFX.com:
Creating a CAPTCHA for Your Site
April 04, 2006 @ 13:02:51

Via a pointer from the Zend Developer Zone, there's a new bit of code over on CodedFX.com to help you generate a CAPTCHA image to prevent spam messages from bots in your comments.

There's two files in his example - the main PHP that does the work and a font file to pull the text from. The code is pretty straight-forward, and can almost be cut and paste into any kind of application. Working with the font file is a little tricky, but GD has built-in functionality to work with it.

The script allows for any kind of true-type font input, multiple color schemes, transparency, and the ability to angle the letters to make them harder to interpret. The resulting output from his script is a PNG image, but with a few modifications, it could create JPEGs as well.

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