If this is an open site, using the IP won't be any good. We have over 200 people behind our NAT firewall, all of which would show up as coming from the same IP on your server. Many other networks have the same or a similar configuration. If you only allow registered users, add a couple of flags to your user table and set one of them when they fill out the form. Don't show them the form after it is set. Having a couple, you can do a couple of questionnaires simultaneously, and clear the matching flag when you close the form. Bob McConnell -----Original Message----- From: Juan Rodriguez Monti [mailto:juan@xxxxxxxxxxxxxxxxxxxxx] Sent: Wednesday, June 16, 2010 2:26 PM 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 -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
