Caching in PHP

furious5

I've got a script which displays messages and allows users to submit new messages.

On submitting the form, the message is inserted in to the db via a function and on the page being refreshed another function is called which displays all the messages.

What I am finding is the page is not refreshing properly and it is only when I refresh using ctrl + f5 that the new message appears.

At first I assume this was because I was buffering the output, so I took this out as it shouldn't have been in there is the first place. Next up I tried to enforce the browser to refresh using:

header("Pragma: no-cache"); 
header("Cache-Control:no-cache, must revalidate");

Still no joy, the only other thing I could think it was, was a flash animation which I took out and still no further joy.

Anyone got any ideas?

nemonoman

Different browsers require different headers: I use all of these:

    header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");    // Date in the past
    header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT"); // always modified
    header("Cache-Control: no-store, no-cache, must-revalidate");  // HTTP/1.1
    header("Cache-Control: post-check=0, pre-check=0", FALSE);
    header("Pragma: no-cache");                          // HTTP/1.0

And if anyone has any others, I'll add those as well!

furious5

Just added those, and given it another try. Still no joy.

Browser I'm testing on is IE5, will see how a few others perform

nemonoman

IE5 sucks.

HOWEVER:
CLEAR your own cache before you go too nuts...

If you cached the Old page with the OLD headers, you may not be seeing/caching the new Page with the new, don't cache headers.

Try that, and if it still doesn't work, go nuts with my blessings.

furious5

Still no joy. Cleared absolutely everything out.

Just tested in Firefox and I have exactly the same problem.

nemonoman

post the URL. Something's up somewhere.

furious5

Had another look through this, this morning with a fresh set of eyes and spotted a few problems which may have contributed to part of the problem.

I've made some amendments to these, however what I think is really the problem is that the function is not being refreshed on each page call, hence it is not showing the new inserted messages.