The SitePoint PHP blog has a recent tutorial showing you how you can use one of three different ways to embed badges into your site. These "badges" are a common practice among sites allowing other sites/applications to embed small statistics such as number of Tweets or Likes about a page.

One great way of organically promoting your application is to provide “badges”; snippets of content that people can embed on their own websites. [...] This can contain up-to-the-minute information from your application about a user, piece of content or another object, dynamically generated and inserted into other websites. In this article I’m going to take a look at some of the ways you can implement this.

He walks you through the creation of a simple application based on Silex, using Twig for template rendering and the WideImage library for creating the images. His datastore, a static array, lists an image, rank and number of "trophies" for each user of the system. He creates a main page showing all of the badges at once, making use of an "iframe" to contain the dynamically created image. He shows how to use the WideImage library to pull in the background, avatar and trophy images, merge them together and add a bit of text with the username and level ranking. Finally he includes the Javascript needed so the remote site can just use a "script" tag to pull in the rendered image and place it on their page.