if sessionId, err := req.Cookie("frontend"); err == nil {
    if sessionData, err := redis.Get("PHPREDIS_SESSION:" + sessionId.Value); err == nil {
        decoder := php_session_decoder.NewPhpDecoder(sessionData.String())
        if sessionDataDecoded, err := decoder.Decode(); err == nil {
            //Do something with session data  
        }
    } else {
        //Can not load session - it can be expired
    }
}

data := make(PhpSession)
data["make some"] = " changes"
encoder := NewPhpEncoder(data)
if result, err := encoder.Encode(); err == nil {
    //Write data to redis/memcached/file/etc
}