PHP Captcha Security Images Script

PHP Captcha Security Images Script
      for creating the php captcha security image script visit here and download the script.
    http://www.white-hat-web-design.co.uk/articles/php-captcha.php

This script generates images (known as "Captcha's") which contain security codes used for protecting a form from spam bots. By encoding a 'password' inside an image and asking the user to re-enter what they see you can verify the user is a human and not automated software submitting your form. Why not try out the following form with valid and invalid codes to see how it works.

for more pls visit

    http://www.white-hat-web-design.co.uk/articles/php-captcha.php