CSS on the Fly

$csscache = 'cache/cache.css';
$cacheTime = filemtime($csscache);
 
if(isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) && strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) >= $cacheTime)
{
	header("HTTP/1.0 304 Not Modified");
}
else
{
	header('Content-type: text/css');
	header('Last-Modified: ' . gmdate("D, d M Y H:i:s",$cacheTime) . ' GMT');
 
	readfile($csscache);
}