Posted by Erwin Moller on 11/10/06 13:02

Matthew Wilson wrote:

> Hi, we are getting a lot of spam through our PHP Feedback form, and have
> set up a new field 'prove you're human', asking them to do some simple
> maths.
>
> What is the command for the PHP script itself, to say "this field must be
> equal to 9 or return the error page"?
>
> Thanks!
>
> Matt

Hi Matt,

Go to Wikipedia or something like that and search for an approach named
captcha.
It boils down to the fact that a simple Turingtest (with distored images) is
used to make sure the user is human and not a (simple) bot.
Don't buy a solution, many free captcha alternatives are out there. :-)

Regards,
Erwin Moller

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