Are you have problems with automated SPAM bots submitting to your PHP form? This can easily be fixed by adding a CAPTCHA to your form. CAPTCHA stands for: Completely Automated Public Turing test to tell Computers and Humans Apart. The main purpose of a CAPTCHA is to distinguish human from a computer. A code or image is presented in a way that only a human would be able to understand, so say good bye to automated SPAM!