RE: [PHP] preventing "back" button usage?

Good day, This can be accomplished in a few ways. The easiest way is to tell the client not to cache the page. And yep, you do this via headers. In PHP (attempting to hit as many types of browsers as possible): header("Cache-Control: no-store, no-cache, must-revalidate"); header("Pragma: no-cache"); You can also do some fancy redirection with Location headers. As a failsafe, you should have the processing page make sure that the user isn't submitting the same thing more than once. ============================ Darren Gamble Planner, Regional Services Shaw Cablesystems GP 630 - 3rd Avenue SW Calgary, Alberta, Canada T2P 4L4 (403) 781-4948 -----Original Message----- From: Erik Price [mailto:pricee@hhbrown.com] Sent: Wednesday, March 27, 2002 2:10 PM To: php-general@lists.php.net Subject: [PHP] preventing "back" button usage? Sorry to plague this list with questions today, but I was hoping someone could help me understand a fundamental thing about how browsers work -- how can I achieve the effect that many ecommerce sites (such as Amazon) use to prevent the user from going "back" in their history? For obvious reasons, I would like to avoid JavaScript to achieve this feat. I have some multi-part forms that I do not wish users to be able to repeat accidentally. I believe it has something to do with a header and the browser's cache, but I really don't know anything about it. TIA, Erik ---- Erik Price Web Developer Temp Media Lab, H.H. Brown pricee@hhbrown.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php