sign in via facebook account (in codeigniter)
I have a simple website that calculates grades of college students. There are different subjects for each department. Each department has almost 42 subjects. I am thinking of providing a username/password authentication to users so that they don't have to input grades for each subject every time. But I do not want users to register on my site by filling a sign up form. I want them to log in via their face book account. I am thinking about it but I can't figure out how i can do this. I have developed my site in CodeIgniter.
I looked for the same solution, here is my blog post about it:
a3m for CodeIgniter is pretty good at doing what you want, plus it offers all the other openid providers (other than facebook)