Minify_ImportProcessor::_importCB PHP Method

    private function _importCB($m)
    {
        $url = $m[1];
        $mediaList = preg_replace('/\\s+/', '', $m[2]);
        if (strpos($url, '://') > 0) {
            // protocol, leave in place for CSS, comment for JS
            return self::$_isCss ? $m[0] : "/* Minify_ImportProcessor will not include remote content */";
        }
        if ('/' === $url[0]) {
            // protocol-relative or root path
            $url = ltrim($url, '/');
            $file = realpath($_SERVER['DOCUMENT_ROOT']) . DIRECTORY_SEPARATOR . strtr($url, '/', DIRECTORY_SEPARATOR);
        } else {
            // relative to current path
            $file = $this->_currentDir . DIRECTORY_SEPARATOR . strtr($url, '/', DIRECTORY_SEPARATOR);
        }
        $obj = new Minify_ImportProcessor(dirname($file), $this->_currentDir);
        $content = $obj->_getContent($file, true);
        if ('' === $content) {
            // failed. leave in place for CSS, comment for JS
            return self::$_isCss ? $m[0] : "/* Minify_ImportProcessor could not fetch '{$file}' */";
        }
        return !self::$_isCss || preg_match('@(?:^$|\\ball\\b)@', $mediaList) ? $content : "@media {$mediaList} {\n{$content}\n}\n";
    }