Minimize and combine css files to optimize file loading.

<?php

header('Content-type: text/css');
  header ("cache-control: must-revalidate");
  ob_start("compress");
  function compress($buffer) {
    /* remove comments */
    $buffer = preg_replace('!/\*[^*]*\*+([^/][^*]*\*+)*/!', '', $buffer);
    /* remove tabs, spaces, newlines, etc. */
    $buffer = str_replace(array("\r\n", "\r", "\n", "\t", '  ', '    ', '    '), '', $buffer);
    return $buffer;
  }
	
  /* your css files */
  include('voorbeeld.css');

  ob_end_flush();

?>