Habari\Site::get_dir PHP Method

    public static function get_dir($name, $trail = false)
    {
        $path = '';
        switch (strtolower($name)) {
            case 'config_file':
                $path = Site::get_dir('config') . '/config.php';
                break;
            case 'config':
                if (self::$config_path) {
                    return self::$config_path;
                }
                self::$config_path = HABARI_PATH;
                $config_dirs = preg_replace('/^' . preg_quote(HABARI_PATH, '/') . '\\/user\\/sites\\/(.*)/', '$1', Utils::glob(HABARI_PATH . '/user/sites/*', GLOB_ONLYDIR));
                if (empty($config_dirs)) {
                    return self::$config_path;
                }
                // Collect host parts
                $server = InputFilter::parse_url(Site::get_url('habari'));
                $request = array();
                if (isset($server['port']) && $server['port'] != '' && $server['port'] != '80') {
                    $request[] = $server['port'];
                }
                $request = array_merge($request, explode('.', $server['host']));
                // Collect the subdirectory(s) the core is located in to determine the base path later
                // Don't add them to $request, they will be added with $_SERVER['REQUEST_URI']
                $basesegments = count($request);
                if (!empty($server['path'])) {
                    $coresubdir = explode('/', trim($server['path'], '/'));
                    $basesegments += count($coresubdir);
                }
                // Preserve $request without directories for fallback
                $request_base = $request;
                // Add directory part
                if (!empty(trim($_SERVER['REQUEST_URI'], '/'))) {
                    $subdirectories = explode('/', trim($_SERVER['REQUEST_URI'], '/'));
                    $request = array_merge($request, $subdirectories);
                }
                // Now cut parts until we found a matching site directory
                $cuts = 0;
                $dir_cuts = 0;
                do {
                    $match = implode('.', $request);
                    if (in_array($match, $config_dirs)) {
                        self::$config_dir = $match;
                        self::$config_path = HABARI_PATH . '/user/sites/' . self::$config_dir;
                        self::$config_type = isset($subdirectories) && array_intersect($subdirectories, $request) == $subdirectories ? Site::CONFIG_SUBDIR : Site::CONFIG_SUBDOMAIN;
                        self::$config_urldir = implode('/', array_slice($request, $basesegments + $cuts));
                        break;
                    }
                    // Cut a part from the beginning
                    array_shift($request);
                    $cuts--;
                    // Do not fallback to only the directory part, instead, cut one and start over
                    if ($basesegments + $cuts <= 0 && isset($subdirectories) && $dir_cuts < count($subdirectories)) {
                        $cuts = 0;
                        $dir_cuts++;
                        $request = array_merge($request_base, array_slice($subdirectories, 0, count($subdirectories) - $dir_cuts));
                    }
                    // What does the following check do?!
                    if ($cuts < -10) {
                        echo $cuts;
                        var_dump($request);
                        die('too many ');
                    }
                } while (count($request) > 0);
                $path = self::$config_path;
                break;
            case 'user':
                if (Site::get_dir('config') == HABARI_PATH) {
                    $path = HABARI_PATH . '/user';
                } else {
                    $path = Site::get_dir('config');
                }
                break;
            case 'theme':
                $theme = Themes::get_theme_dir();
                if (file_exists(Site::get_dir('config') . '/themes/' . $theme)) {
                    $path = Site::get_dir('user') . '/themes/' . $theme;
                } elseif (file_exists(HABARI_PATH . '/user/themes/' . $theme)) {
                    $path = HABARI_PATH . '/user/themes/' . $theme;
                } elseif (file_exists(HABARI_PATH . '/3rdparty/themes/' . $theme)) {
                    $path = Site::get_dir('habari') . '/3rdparty/themes/' . $theme;
                } else {
                    $path = HABARI_PATH . '/system/themes/' . $theme;
                }
                break;
            case 'admin_theme':
                $path = HABARI_PATH . '/system/admin';
                break;
            case 'vendor':
                $path = HABARI_PATH . '/system/vendor';
                break;
        }
        $path .= Utils::trail($trail);
        $path = Plugins::filter('site_dir_' . $name, $path);
        return $path;
    }