How Can I Prevent Browser Caching of Assets Served Through PHP?

Avoiding Browser Caching of Assets Requested Through PHP Pages

When updating your site's CSS, JS, or image files, you may notice that the browser continues to display the old, cached versions. Here's how to prevent this issue when serving pages through PHP:

Using HTTP Headers

To prevent the browser from caching assets requested through PHP pages, modify your PHP code to add the following HTTP headers:

<?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");

?>

These headers instruct the browser:

• Not to store the asset in its cache.
• Not to use a cached version of the asset, even if it is older than the current version.
• Not to perform any caching checks before requesting the asset from the server.
• Not to cache the asset even if it is requested multiple times.

By adding these headers to your PHP code, the browser will be forced to fetch the latest version of the asset every time it is requested, ensuring that visitors always receive the most up-to-date version.

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