A McGraw Hill Book Plug-in PHP: 100 Power Solutions
By Robin Nixon (McGraw Hill 2010, ISBN 978-0071666596)

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Chapter 6: Plug-in 34 - Check Captcha

Once you have created a Captcha image and asked a user to type it in you can use this plug-in to verify their input, and determine whether they entered the correct word.

The Figure shows one Captcha attempt that has failed, and another that is successful.