yii\redis\Session::calculateKey PHP Метод

Generates a unique key used for storing session data in cache.

protected calculateKey ( string $id ) : string
$id	string	session variable name
Результат	string	a safe cache key associated with the session variable name

    protected function calculateKey($id)
    {
        return $this->keyPrefix . md5(json_encode([__CLASS__, $id]));
    }

Session