PHWinfo - Afficher un message - Recommendations on image verification libraries?

19/10/2007, 05h21

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 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.

19/10/2007, 05h21	#4
Preventer of Work Messages: n/a Hébergeur:	Re: Recommendations on image verification libraries? 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 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.