Posted by Francois Bonzon on 06/14/06 23:16

After a Google search, I see that quite a few CAPTCHA implementations
in PHP are available. I'd like one that's not (easily) OCR-able, or
otherwise crackable. Open source or commercial is not important. Any
recommendations, or experience with a specific one to share?

I get a lot of SPAM entries on a guestbook, and want to protect it.
I'll require users to solve a CAPTCHA before their entry is accepted. I
might use CAPTCHAs to protect other form submissions, though.

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