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Free PHP CAPTCHA Form Validation
Authenticate data was entered by a person, not a computer
Implementing an "email-a-friend" feature for the Antique Shop, I needed to verify the form was filled out by a person and not automatically by some script or computer. I was looking for a "CAPTCHA" (click for CAPTCHA defined). Basically it is an somewhat randomly generated set of characters and letters displayed as an image, the user has to enter the text to confirm they're an actual person.
“Completely Automated Public Turing test to tell Computers and Human Apart”
Some folks over at PHPCAPTCHA.org have put together a great FREE PHP CAPTCHA package with code examples and documentation. The code is easy to integrate, the image is easy to read and the process only took a few minutes.
How can I be sure a person is filling out my web form and not a computer?