You can delete the browser cache by setting these headers:
<?php
header("Expires: Tue, 01 Jan 2000 00:00:00 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");
?>
It seams you need to versionate, so when some change happens browser will catch something new and user won't need to clear browser's cache.
You can do it by subfolders (example /css/v1/style.css) or by filename (example: css/style_v1.css) or even by setting different folders for your website, example:
www.mywebsite.com/site1
www.mywebsite.com/site2
www.mywebsite.com/site3
And use a .htaccess or even change httpd.conf to redirect to your current application.
If's about one image or page:
<?$time = date("H:i:s");?>
<img src="myfile.jpg?time=<?$time;?>">
You can use $time on parts when you don't wanna cache. So it will always pull a new image. Versionate it seams a better approach, otherwise it can overload your server. Remember, browser's cache it's not only good to user experience, but also for your server.
With recent browser support of "Clear-Site-Data" headers, you can clear different types of data: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Clear-Site-Data
header('Clear-Site-Data: "cache", "cookies", "storage", "executionContexts"');
Source: Stackoverflow.com