How to make a very basic captcha image and validate the form input to make sure the code matches. Does not use sessions of any sort. The image also just uses the built in PHP fonts so no need to load font files. I also put three random lines in the

Click Captcha Stop the form spammers Click Captcha is a randomly generated gif file that is dynamically displayed in a random area below form with 9 random color combinations and the click number is randomly displayed to the right or left making 18

The communication protocol is byte oriented. Both sending and receiving bytes are in hexadecimal format. The communication parameters are as follows, Baud rate: 19200 bps Data: 8 bits Stop: 1 bit Parity: None Flow control: None