Expire the previous page?

[Adrian28uk]

Is there a way to expire the previous page so that for example a user is not able to make changes to a database?

I have a webform that submits information to mysql and once complete goes to a page that says the information has been submitted. If you click the back button you can submit this information again to mysql. Just wondered if there some code in php I can use to stop this?

Thank you in advance!!

[hadoob024]

Here's what I did. I broke it up into 2 pages. I have the form page, and the form processing page. On the form page, I create a SESSION variable. Then on the form processing page, I check to make sure that the SESSION variable exists and has the correct value. I then clean my variables, add the info to the db, and then delete the SESSION. That way, if someone tries to go back, the SESSION variable won't be there, so they won't be able to re-submit the info.