How to prevent Browser cache for php site

try this

<?phpheader("Cache-Control: no-store, no-cache, must-revalidate, max-age=0");header("Cache-Control: post-check=0, pre-check=0", false);header("Pragma: no-cache");?>

Here, if you want to control it through HTML: do like below Option 1:

<meta http-equiv="expires" content="Sun, 01 Jan 2014 00:00:00 GMT"/><meta http-equiv="pragma" content="no-cache" />

And if you want to control it through PHP: do it like below Option 2:

header('Expires: Sun, 01 Jan 2014 00:00:00 GMT');header('Cache-Control: no-store, no-cache, must-revalidate');header('Cache-Control: post-check=0, pre-check=0', FALSE);header('Pragma: no-cache');

AND Option 2 IS ALWAYS BETTER in order to avoid proxy based caching issue.

You can try this:

    header("Expires: Tue, 03 Jul 2001 06:00:00 GMT");    header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");    header("Cache-Control: no-store, no-cache, must-revalidate, max-age=0");    header("Cache-Control: post-check=0, pre-check=0", false);    header("Pragma: no-cache");    header("Connection: close");

Hopefully it will help prevent Cache, if any!