source: Dev/branches/cakephp/app/webroot/css.php @ 126

<?php
/**
 * CSS helping functions
 *
 * PHP versions 4 and 5
 *
 * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
 * Copyright 2005-2011, Cake Software Foundation, Inc. (http://cakefoundation.org)
 *
 * Licensed under The MIT License
 * Redistributions of files must retain the above copyright notice.
 *
 * @copyright     Copyright 2005-2011, Cake Software Foundation, Inc. (http://cakefoundation.org)
 * @link          http://cakephp.org CakePHP(tm) Project
 * @package       cake
 * @subpackage    cake.app.webroot
 * @since         CakePHP(tm) v 0.2.9
 * @license       MIT License (http://www.opensource.org/licenses/mit-license.php)
 */
if (!defined('CAKE_CORE_INCLUDE_PATH')) {
        header('HTTP/1.1 404 Not Found');
        exit('File Not Found');
}

/**
 * Ensure required classes are available.
 */
if (!class_exists('File')) {
        uses('file');
}

/**
 * Make clean CSS
 *
 * @param unknown_type $path
 * @param unknown_type $name
 * @return unknown
 */
        function make_clean_css($path, $name) {
                App::import('Vendor', 'csspp' . DS . 'csspp');
                $data = file_get_contents($path);
                $csspp = new csspp();
                $output = $csspp->compress($data);
                $ratio = 100 - (round(strlen($output) / strlen($data), 3) * 100);
                $output = " /* file: $name, ratio: $ratio% */ " . $output;
                return $output;
        }
/**
 * Write CSS cache
 *
 * @param unknown_type $path
 * @param unknown_type $content
 * @return unknown
 */
        function write_css_cache($path, $content) {
                if (!is_dir(dirname($path))) {
                        mkdir(dirname($path));
                }
                $cache = new File($path);
                return $cache->write($content);
        }

        if (preg_match('|\.\.|', $url) || !preg_match('|^ccss/(.+)$|i', $url, $regs)) {
                die('Wrong file name.');
        }

        $filename = 'css/' . $regs[1];
        $filepath = CSS . $regs[1];
        $cachepath = CACHE . 'css' . DS . str_replace(array('/','\\'), '-', $regs[1]);

        if (!file_exists($filepath)) {
                die('Wrong file name.');
        }

        if (file_exists($cachepath)) {
                $templateModified = filemtime($filepath);
                $cacheModified = filemtime($cachepath);

                if ($templateModified > $cacheModified) {
                        $output = make_clean_css($filepath, $filename);
                        write_css_cache($cachepath, $output);
                } else {
                        $output = file_get_contents($cachepath);
                }
        } else {
                $output = make_clean_css($filepath, $filename);
                write_css_cache($cachepath, $output);
                $templateModified = time();
        }

        header("Date: " . date("D, j M Y G:i:s ", $templateModified) . 'GMT');
        header("Content-Type: text/css");
        header("Expires: " . gmdate("D, d M Y H:i:s", time() + DAY) . " GMT");
        header("Cache-Control: max-age=86400, must-revalidate"); // HTTP/1.1
        header("Pragma: cache");        // HTTP/1.0
        print $output;