change css in php

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2Rename your style.css file to style.php, then add the following to the top of the file:
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4<?php header("Content-type: text/css"); ?>
5This line tells the browser that the file is CSS instead of HTML. 
6In your HTML files, change the stylesheet references from style.css to style.php. For example:
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8<link rel="stylesheet" type="text/css"
9 media="screen" href="style.php">