public static function renderStatic(array $arguments, \Closure $renderChildrenClosure, RenderingContextInterface $renderingContext)
{
$email = $arguments['email'];
$size = $arguments['size'];
$imageSet = $arguments['imageSet'];
$maximumRating = $arguments['maximumRating'];
$secure = (bool) $arguments['secure'];
$url = true === $secure ? self::GRAVATAR_SECURE_BASEURL : self::GRAVATAR_BASEURL;
$url .= md5(strtolower(trim($email)));
$query = http_build_query(array('s' => $size, 'd' => $imageSet, 'r' => $maximumRating));
$url .= false === empty($query) ? '?' . $query : '';
return $url;
}