How Can I Prevent Browser Caching of Assets Loaded via PHP?

Resolving Browser Caching Issues for Assets Loaded via PHP

When updating CSS, JS, or image files, you may encounter cached files being served by the browser, preventing the updated assets from displaying correctly. This issue can be resolved by implementing PHP headers to control browser caching behavior.

PHP Header Implementation

To prevent browser caching of assets loaded from PHP pages, you can use the following PHP code:

<?php

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");

?>

Explanation

• Cache-Control: no-store, no-cache, must-revalidate, max-age=0: This header instructs the browser to avoid storing the assets in its cache.
• Cache-Control: post-check=0, pre-check=0: This header prevents the browser from validating the unmodified assets from the server.
• Pragma: no-cache: This header is deprecated but is still supported by some browsers to enforce the "no-cache" behavior.

By implementing these headers, the browser will be forced to fetch the latest versions of your CSS, JS, and image files from the server, ensuring that the updated versions are always displayed.

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