How to avoid "Warning: Page Has Expired" ?

Boxers

Can anyone help me nail this error message once and for all.

I have various forms which are submitted using POST - which I do on forms which will result in a database update. The problem is that when people use the back button to get back to a page which resulted from a POSTed form they get the above standard IE warning message.

I've played around with the session_cache_limiter function but don't seem to get what I want.

I don't want the browser to cache results. i.e. if the update being made is to delete an item from a list, then I don't want them to press the back button only to see the item is still there from the cache.

Not sure all that is clear, but does anyone know an elegent way to avoid the Warning message ?

Many thanks

Boxers

Sorry, sorry, sorry - I've put this in the wrong forum.

Could the administrator delete this and I'll put it in the right place.

Sorry again.

bpat1434

Well before any output is thrown, set some headers:

header("Cache-Control: no-cache, must-revalidate"); // disable the cache
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); // Date in the past so it's expired

Then, in your page, just constantly check to see if there are POSTed vars, if not, display (or redirect to) an error page.

Plus, you could also just empty the $_POST array.....

~Brett