Category: PHP Script Codes > RainCaptcha
Advanced CAPTCHA class which does not require any image processing extensions (GD/ImageMagick/etc). Developed to be readable by humans and resistant to OCR software. It generates black-and-white images with 5 distorted letters on them and noise. Checking algorithm is case-insensitive. It has very simple API (documentation is available on download page) which makes it easy to implement it on new and existing websites.