PHPでCSSコードを圧縮する方法について

<?php
header(&#39;Content-type: text/css&#39;);ob_start("compress");function compress($buffer) {
  /* remove comments */
  $buffer = preg_replace(&#39;!/\*[^*]*\*+([^/][^*]*\*+)*/!&#39;, &#39;&#39;, $buffer);
  /* remove tabs, spaces, newlines, etc. */
  $buffer = str_replace(array("
", "\r", "\n", "\t", &#39;  &#39;, &#39;    &#39;, &#39;    &#39;), &#39;&#39;, $buffer);
  return $buffer;}
 /* your css files */include(&#39;master.css&#39;);include(&#39;typography.css&#39;);include(&#39;grid.css&#39;);include(&#39;print.css&#39;);include(&#39;handheld.css&#39;);
 ob_end_flush();

<link rel="stylesheet" type="text/css" media="screen" href="style.css.php"/>