DRBImageVerification is a simple anti-spam image verification, or CAPTCHA, script.
Here are some key features of "DRBImageVerification":
· Quick and easy to install.
· Verification string length and character list are configurable.
· Requires a session cookie, for additional obscurity.
· Includes an example PHP page demonstrating how to add a verification image to a form.
· PHP 4.4 or higher
· GD library