How can I prevent spam through a calculation?

Posted by ricky roy on Stack Overflow See other posts from Stack Overflow or by ricky roy
Published on 2010-05-21T12:06:39Z Indexed on 2010/05/21 12:20 UTC
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I have a contact form written in PHP that currently has a form field that tries to prevent spam through a calculation (3 + 1). I need that form field to have multiple calculations and at random so prevent spam.

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