Re: Recommendations on image verification libraries?

laredotornado@xxxxxxxxxxx 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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