The SitePoint PHP blog continues their series of tutorials showing how to authentication your users against various social networks. In the previous post they covered connecting to Google+ and in this latest post they move on to two other popular social networks: Facebook and Twitter.

In the previous parts of this series, we created our initial interfaces, set up our Google+ login functionality and talked about how we can merge our accounts together. In this article, we will integrate Twitter and Facebook within our application. You will see a lot of similarities with the Google+ article, so if you could follow that one easily, you won’t have much trouble with this one. If you haven’t read that article yet, I suggest you read it first before continuing this article.

He starts off with the Twitter authentication, creating a new "SocialLogin" object type for it and defining the three required properties it needs to connect. Code is included to make the OAuth connection, pass along the callback URL and forward on the user to the Twitter site for approval. Code is also included to store the data about the Twitter user in your application. Next up is Facebook. The connection is very similar to the others with only a slight difference in the data that's required. You can find the full code for the tutorial so far in this Github repository.