What are the best practices for ensuring that externally called PHP files are immune to caching issues?

When externally called PHP files are prone to caching issues, it is essential to include cache-control headers in the response to prevent the file from being cached by the browser or any intermediate caches. This can be achieved by setting the appropriate headers using the header() function in PHP. By setting the cache-control header to 'no-cache', the browser will always request the latest version of the file from the server, ensuring that caching issues are avoided. 

<?php
header("Cache-Control: no-cache, no-store, must-revalidate");
header("Pragma: no-cache");
header("Expires: 0");

// Your PHP code here
?>

Keywords

cache-control headers timestamp filemtime cache-busting

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