More removes.

css-compress.php

<?php
/**
 * On-the-fly CSS Compression
 * Copyright (c) 2009 and onwards, Manas Tungare.
 * Creative Commons Attribution, Share-Alike.
 *
 * In order to minimize the number and size of HTTP requests for CSS content,
 * this script combines multiple CSS files into a single file and compresses
 * it on-the-fly.
 *
 * To use this in your HTML, link to it in the usual way:
 * <link rel="stylesheet" type="text/css" media="screen, print, projection" href="/css/compressed.css.php" />
 */

/* Add your CSS files to this array (THESE ARE ONLY EXAMPLES) */
$cssFiles = array(
    'ads.css',
    'formatting.css',
    'pagesections.css',
    'print.css',
    'screen.css',
    'sidebar.css',
);

$buffer = '';
foreach ($cssFiles as $cssFile) {
    $buffer .= file_get_contents($cssFile);
}

// Remove comments
$buffer = preg_replace('!/\*[^*]*\*+([^/][^*]*\*+)*/!', '', $buffer);

// Remove whitespace
$buffer = str_replace(array("\r\n", "\r", "\n", "\t"), '', $buffer);

// Collapse adjacent spaces into a single space
$buffer = preg_replace('/ {2,}/', ' ', $buffer);

// Remove spaces that might still be left where we know they aren't needed
$buffer = str_replace(array(' }', '} '), '}', $buffer);
$buffer = str_replace(array(' {', '{ '), '{', $buffer);
$buffer = str_replace(array(' :', ': '), ':', $buffer);
$buffer = str_replace(array(' ;', '; '), ';', $buffer);
$buffer = str_replace(array(' ,', ', '), ',', $buffer);
$buffer = str_replace(array(' >', '> '), '>', $buffer);
$buffer = str_replace(' [', '[', $buffer);

// Remove space after colons
$buffer = str_replace(': ', ':', $buffer);

// Remove useless semicolon
$buffer = str_replace(';}', '}', $buffer);

// Remove useless units
$buffer = preg_replace('/([:,])0(ch|cm|em|ex|in|mm|pc|pt|px|rem|vh|vmin|vmax|vw%)/', '${1}0', $buffer);

// Remove trailing 0 in values
$buffer = preg_replace('/([\(:; ])0\./', '${1}.', $buffer);  // 0.1 => .1
$buffer = preg_replace('/(\.\d+?)0+\b/', '$1', $buffer);     // 10.500 => 10.5

// Outout data
ob_start('ob_gzhandler');
header('Cache-Control: public');
header('Expires: '.gmdate('D, d M Y H:i:s', time() + 86400).' GMT');
header('Content-type: text/css');
echo($buffer);

?>