Category: PHP Script Codes > Math Captcha image validation
With all the Captcha decoders these days, its impossible to build a solid Captcha image validator with a string. The solution? Have a captcha that asks simple math addition questions! Decoders are not very good at breaking these.

This tutorial will show you how to make a basic math CAPTCHA validtion form.

This requires that you have the GD library for PHP installed to work.