Phalcon\Avatar\Gravatar::setRating PHP Метод

    public function setRating($rating)
    {
        $rating = strtolower(trim($rating));
        if (!isset($this->validRatings[$rating])) {
            $allowed = array_keys($this->validRatings);
            $last = array_pop($allowed);
            $allowed = join(',', $allowed);
            throw new InvalidArgumentException(sprintf("Invalid rating '%s' specified. Available for use only: %s or %s", $rating, $allowed, $last));
        }
        $this->rating = $rating;
        return $this;
    }