Question about the Gravatar service

Question

PHP

At the request of the browser, the service returns either an avatar attached to the mail or a default picture.

Is it possible using PHP to find out if there is an attached avatar or not? If there is, we show it, if not, we don’t show anything at all (and not the default one).

Answer 1

Request an avatar with the parameter ?d=404. Then gravatar will return 404 if there is no avatar.

Answer 2

In the GET parameter d or default, you can specify the url of the image that will be displayed if there is no avatar, in your case it can be 1 transparent pixel.
Details here:
en.gravatar.com/site/implement/images/