Browser Cache Problem

[ahoo75]

I am writing an web application using php and mysql on linux server. I encountered few times that the browser cache the result of the data query and made the impression that the update command is not success. I have already put following code
<META HTTP-EQUIV="PRAGMA" CONTENT="NO-CACHE">
<META HTTP-EQUIV="Expires" CONTENT="0">
<META HTTP-EQUIV="CACHE-CONTROL" CONTENT="NO-CACHE">

in between head section and after body closing tag. but the result seems to be same. anyone has similar experience and any advice on how to tackle this problem? thanks

[bradgrafelman]

Well, on the page before the one that's being cached, you could randomize the URL a bit so that the browser might be fooled into requesting the data again, i.e.

echo '<a href="myScript.php?rand=' . rand(100,100000) . '">click</a>';

Also, instead of using META tags (which are not enforced - browsers can ignore them if they so choose), why not send actual HTTP headers?

<?PHP
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Pragma: No-cache');
header('Expires: Thu, 01 Dec 1994 16:00:00 GMT');