Source code for using CSS via PHP

The style sheet

The file name is mystyle.php.


<?php header("Content-type: text/css");
$color1 = "yellow";
if ($color1 == "yellow") $color2 = "lightgreen";
?>
body {background-color: <?=$color1?>;}
h2,h3,h4 {background-color: <?=$color2?>;}
#id1 {color: darkgreen; text-align: center; font-weight: bold}

The web page


<HTML>
<HEAD>
<link rel="stylesheet" type="text/css" href="mystyle.php">
</HEAD>
<BODY>
<h1>Welcome to my page!</h1>
Some text.

<h2 id="id1">I am still working on it...</h2>
Some more text...
</BODY>
</HTML>