How can PHP be used to force a browser to reload a page instead of using cached data?

When a browser caches a webpage, it stores a local copy of the page to reduce loading times on subsequent visits. However, this can sometimes lead to outdated content being displayed. To force a browser to reload a page and bypass the cached data, you can append a unique query string to the URL each time the page is loaded. This tricks the browser into thinking it's a new page and forces it to fetch the latest version from the server. 

<?php
echo '<meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" />';
echo '<meta http-equiv="Pragma" content="no-cache" />';
echo '<meta http-equiv="Expires" content="0" />';
?>

Keywords

PHP browser reload cached data header manipulation

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