2010/6/16 Ashley Sheridan <a...@ashleysheridan.co.uk>

>  On Wed, 2010-06-16 at 20:36 +0200, David Cesal wrote:
> Please, don't forget IP address can be same for many users. I see only way 
> with cookies. When user deletes cookies, form pops up again. I don't know any 
> better way.
> David
> Sent from my HTC
> -----Original Message-----
> From: Juan Rodriguez Monti <j...@rodriguezmonti.com.ar>
> Sent: 16. cervna 2010 20:26
> To: php-general@lists.php.net
> Subject: [PHP] User's IP Validation
> Hi people,
> I would like to know the best way to perform some kind of validation
> for an application that I've written.
> I have a system that ask through an HTML Form some questions to users.
> I use some cookies to save some information from the user side.
> However, I would like to implement some code in PHP that would let me
> limit to 1 the number of times that the page with the questions was
> executed.
> I mean, the user fills the HTML's Form, then send it through an HTML
> Button, then PHP receives this informations and send an Email
> containing the replies to the questions. I would like to limit to one,
> the times one single user is able to execute this form.
> I thought getting the IP Address, then doing some kind of validation
> with it. However I don't know if using cookies is the best idea. I
> don't have access to a DataBase for this. So I thought might be a good
> idea write to a file in the server the IP, then perform some if to
> know if the user already replied the form.
> As far as I don't know which is the best way to code this, I felt free
> to ask you guys.
> Thanks a lot.
> Juan
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> Like others have said, unless you have specific user logins, there's no way
> to prevent people from viewing the form more than once. As you are emailing
> them the answers, I assume there is some form of login system being used, so
> you could use that, with some sort of flag to indicate the email has been
> sent. If you want to future-proof the system, you could use some sort of
> binary bit flag to indicate what forms they've been sent answers to, for
> example:
> 0 - no answers have been sent
> 1 - only the first set of answers
> 4 - the 3rd set of answers only
> 5 - the 3rd and 1st set of answers

Yes, tha't s true. However I'm not using a DB for this little job.

There's no login system. There's a little script that runs the form, and
then send an email to some directions, but not for the user's Email address.

I thought I should use cookies, however is far from secure.

Thanks a lot people!.


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