What are the common challenges faced when attempting to disable caching in PHP for browser refreshes?

When attempting to disable caching in PHP for browser refreshes, one common challenge is ensuring that the browser fetches the latest version of a file instead of using a cached version. This can be achieved by setting appropriate headers to indicate that the content should not be cached by the browser. 

<?php
header("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1
header("Expires: Sat, 26 Jul 1997 05:00:00 GMT"); // Date in the past
?>

Keywords

PHP caching browser refresh headers cache-control

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