A highly customizable PHP CAPTCHA image class for generating CAPTCHA images to prevent programs from filling out your forms. This does everything from create and output the image, to validate the code entered by the user in the form. It can show an image in just 3 lines of code, and validate the text in about 6 lines. This supports variable length codes, custom TTF fonts, custom colors, optional lines to obfuscate text, angled text, transparent text and more. Includes several examples.