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How can I add character recognition validation to my website?

I am getting some spam messages on my website. I would like to add one of the character recognition validation functions you see on websites which prevent bots from submitting spam.

Does anyone know where I can find an example in php?
Will, August 2007


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done
go to phpya.com there are some very good examples for "captcha". or google the word "Captcha examples in php".

sebage AV Arg, August 2008

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