Sokil\Mongo\Cursor::byId PHP Method

    public function byId($id)
    {
        if ($id instanceof \MongoId) {
            $this->expression->where('_id', $id);
        } else {
            try {
                $this->expression->where('_id', new \MongoId($id));
            } catch (\MongoException $e) {
                $this->expression->where('_id', $id);
            }
        }
        return $this;
    }