Minify_CSS_UriRewriter::prepend PHP Method

    public static function prepend($css, $path)
    {
        self::$_prependPath = $path;
        $css = self::_trimUrls($css);
        $css = self::_owlifySvgPaths($css);
        // append
        $pattern = '/@import\\s+([\'"])(.*?)[\'"]/';
        $css = preg_replace_callback($pattern, array(self::$className, '_processUriCB'), $css);
        $pattern = '/url\\(\\s*([\'"](.*?)[\'"]|[^\\)\\s]+)\\s*\\)/';
        $css = preg_replace_callback($pattern, array(self::$className, '_processUriCB'), $css);
        $css = self::_unOwlify($css);
        self::$_prependPath = null;
        return $css;
    }

 /**
  * Minify a CSS string
  * 
  * @param string $css
  * 
  * @param array $options available options:
  * 
  * 'preserveComments': (default true) multi-line comments that begin
  * with "/*!" will be preserved with newlines before and after to
  * enhance readability.
  * 
  * 'prependRelativePath': (default null) if given, this string will be
  * prepended to all relative URIs in import/url declarations
  * 
  * 'currentDir': (default null) if given, this is assumed to be the
  * directory of the current CSS file. Using this, minify will rewrite
  * all relative URIs in import/url declarations to correctly point to
  * the desired files. For this to work, the files *must* exist and be
  * visible by the PHP process.
  *
  * 'symlinks': (default = array()) If the CSS file is stored in 
  * a symlink-ed directory, provide an array of link paths to
  * target paths, where the link paths are within the document root. Because 
  * paths need to be normalized for this to work, use "//" to substitute 
  * the doc root in the link paths (the array keys). E.g.:
  * <code>
  * array('//symlink' => '/real/target/path') // unix
  * array('//static' => 'D:\\staticStorage')  // Windows
  * </code>
  * 
  * @return string
  */
 static public function minify($css, $options = array()) 
 {
     require_once 'Minify/CSS/Compressor.php';
     if (isset($options['preserveComments']) 
         && !$options['preserveComments']) {
         $css = Minify_CSS_Compressor::process($css, $options);
     } else {
         require_once 'Minify/CommentPreserver.php';
         $css = Minify_CommentPreserver::process(
             $css
             ,array('Minify_CSS_Compressor', 'process')
             ,array($options)
         );
     }
     if (! isset($options['currentDir']) && ! isset($options['prependRelativePath'])) {
         return $css;
     }
     require_once 'Minify/CSS/UriRewriter.php';
     if (isset($options['currentDir'])) {
         return Minify_CSS_UriRewriter::rewrite(
             $css
             ,$options['currentDir']
             ,isset($options['docRoot']) ? $options['docRoot'] : $_SERVER['DOCUMENT_ROOT']
             ,isset($options['symlinks']) ? $options['symlinks'] : array()
         );  
     } else {
         return Minify_CSS_UriRewriter::prepend(
             $css
             ,$options['prependRelativePath']
         );
     }
 }