AssetModel::serveCss PHP Method

    public function serveCss($themeType, $filename)
    {
        // Split the filename into filename and etag.
        if (preg_match('`([\\w-]+?)-(\\w+).css$`', $filename, $matches)) {
            $basename = $matches[1];
            $eTag = $matches[2];
        } else {
            throw notFoundException();
        }
        $basename = strtolower($basename);
        $this->EventArguments['Basename'] = $basename;
        $this->EventArguments['ETag'] = $eTag;
        $this->fireEvent('BeforeServeCss');
        if (function_exists('header_remove')) {
            header_remove('Set-Cookie');
        }
        // Get list of anchor files
        $anchors = $this->getAnchors();
        safeHeader("Content-Type: text/css");
        $anchorFileName = "{$basename}.css";
        if (!in_array($anchorFileName, $anchors)) {
            safeHeader("HTTP/1.0 404", true, 404);
            echo "/* Could not find {$basename}/{$eTag} */";
            die;
        }
        $requestETags = val('HTTP_IF_NONE_MATCH', $_SERVER);
        $requestETags = explode(',', $requestETags);
        foreach ($requestETags as $requestETag) {
            if ($requestETag == $eTag) {
                safeHeader("HTTP/1.0 304", true, 304);
                die;
            }
        }
        safeHeader("Cache-Control:public, max-age=14400");
        $currentETag = self::eTag();
        safeHeader("ETag: {$currentETag}");
        $cachePath = PATH_CACHE . '/css/' . CLIENT_NAME . '-' . $themeType . '-' . "{$basename}-{$currentETag}.css";
        if (!Debug() && file_exists($cachePath)) {
            readfile($cachePath);
            die;
        }
        // Include minify...
        set_include_path(PATH_LIBRARY . "/vendors/Minify/lib" . PATH_SEPARATOR . get_include_path());
        require_once PATH_LIBRARY . "/vendors/Minify/lib/Minify/CSS.php";
        ob_start();
        echo "/* CSS generated for etag: {$currentETag}.\n *\n";
        $notFound = [];
        $paths = $this->getCssFiles($themeType, $basename, $eTag, $notFound);
        // First, do a pass through the files to generate some information.
        foreach ($paths as $info) {
            list($path, $urlPath) = $info;
            echo " * {$urlPath}\n";
        }
        // Echo the paths that weren't found to help debugging.
        foreach ($notFound as $info) {
            list($filename, $folder) = $info;
            echo " * {$folder}/{$filename} NOT FOUND.\n";
        }
        echo " */\n\n";
        // Now that we have all of the paths we want to serve them.
        foreach ($paths as $info) {
            list($path, $urlPath, $options) = $info;
            echo "/* File: {$urlPath} */\n";
            $css = val('Css', $options);
            if (!$css) {
                $css = file_get_contents($path);
            }
            $css = Minify_CSS::minify($css, ['preserveComments' => true, 'prependRelativePath' => $this->UrlPrefix . asset(dirname($urlPath) . '/'), 'currentDir' => dirname($path), 'minify' => true]);
            echo $css;
            echo "\n\n";
        }
        // Create a cached copy of the file.
        $css = ob_get_flush();
        if (!file_exists(dirname($cachePath))) {
            mkdir(dirname($cachePath), 0775, true);
        }
        file_put_contents($cachePath, $css);
    }

 /**
  * Serve combined CSS assets
  *
  * @param string $themeType Either `desktop` or `mobile`.
  * @param string $filename The basename of the file to serve
  * @since 2.1
  */
 public function css($themeType, $filename)
 {
     $assetModel = new AssetModel();
     $assetModel->serveCss($themeType, $filename);
 }