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Posted by Preventer of Work on 10/19/07 04:21
laredotornado@zipmail.com wrote:
> Hi,
>
> I'm using PHP 4.4.4. I want to block automatic submissions from
> spammers on our web site, so I'd like to use some PHP libraries that
> generate those image graphics and require the user to type the
> characters in the graphics. Do you have any recommendations on things
> you have used that are easy to implement and effective?
>
> Thanks for any advice or experiences you've had, - Dave
>
Google will find some libraries for you. And it will help as not all
spammers have the full set of tools.
You might consider two other options:
1) Ask a random question (you may want a lot of questions) such as 'How
many legs does a dog have?'. This is still accessible, easy for humans,
not so easy for bonehead spammers who only care about captcha graphics.
2) One place uses a wall of small thumbnails with pictures of puppies
and kittens. User has to say which ones are the kittens (maybe 3 out
36 images are kittens). I don't recall the site, but it would be easy
to implement.
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