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Adding this bit of PHP to the end of a stylesheet or script incorporation will dynamically append the UTC time to the URL - making it "unique" on every load. EXTREMELY helpful for clients who might not know how to clear their browser cache.
<link rel="stylesheet" type="text/css" href="path/to/stylesheet.css?r=<?php echo time(); ?>" />
<script type="text/javascript" href="path/to/javascript.js?r=<?php echo time(); ?>"></script>
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