2010/6/16 Ashley Sheridan <ash@xxxxxxxxxxxxxxxxxxxx> > 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 <juan@xxxxxxxxxxxxxxxxxxxxx> > Sent: 16. cervna 2010 20:26 > To: php-general@xxxxxxxxxxxxx > Subject: 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 > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, visit: http://www.php.net/unsub.php > > > > > 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!. Juan
