Auth_OpenID_FileStore::getAssociationFilename PHP Method

    function getAssociationFilename($server_url, $handle)
    {
        if (!$this->active) {
            trigger_error("FileStore no longer active", E_USER_ERROR);
            return null;
        }
        if (strpos($server_url, '://') === false) {
            trigger_error(sprintf("Bad server URL: %s", $server_url), E_USER_WARNING);
            return null;
        }
        list($proto, $rest) = explode('://', $server_url, 2);
        $parts = explode('/', $rest);
        $domain = Auth_OpenID_FileStore::_filenameEscape($parts[0]);
        $url_hash = Auth_OpenID_FileStore::_safe64($server_url);
        if ($handle) {
            $handle_hash = Auth_OpenID_FileStore::_safe64($handle);
        } else {
            $handle_hash = '';
        }
        $filename = sprintf('%s-%s-%s-%s', $proto, $domain, $url_hash, $handle_hash);
        return $this->association_dir . DIRECTORY_SEPARATOR . $filename;
    }