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CAPTCHA validation using PHP and Ajax

CAPTCHA has become a popular means of securing forms against automated submission, by requiring users to enter a string displayed in an automatically generated image. This implementation uses Ajax to conveniently combine CAPTCHA into normal pre-submission form verification. You'll need PHP to be installed with the GD image library (most PHP implementations will have this as standard).

Platform(s): Windows
Date: Dec, 20 2006
Author: The Mouse Whisperer, http://www.crackajax.net/captchaform.php

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Number of Ratings: 180 Votes