How can I force browser to refresh the cache with php?

Question

I am a beginner web "developer". I'm making the site of our dog kennel. I've been facing the cache problem for days. I found out PHP filemtime could do the job, I just want to ask, if I put the PHP code like this, would it work? If not, could you help me please, how to do this?

<link rel="stylesheet" type="text/css" href="../../../styles/basic.css?v=<?php filemtime('../../../styles/basic.css') ?>"/>

Answer 1

A typical web server, such as Apache, uses the time of file modification to inform a web browser of a requested page's age, allowing the browser to take appropriate caching action. With dynamic web pages, the actual PHP script

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Solutions

There are two possible approaches we could take to solving this problem: using HTML meta tags , and using HTTP headers .

HTML meta tags

 <meta http-equiv="expires" content="Mon, 26 Jul 1997 05:00:00 GMT"/> <meta http-equiv="pragma" content="no-cache" />

HTTP headers

<?php
header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');
header('Pragma: no-cache');
?>