Login with php and save users unique id

I have a website in which I am supposed to implement open Id . I am using smarty . Now I am totally messed up how to keep record of the user or to create session for the user since templates are htm file in my case 开发者_运维百科

and in the facebook example we used php files to extract data of the user (http://excoflare.com/dev2011/socialnetwork/index.php?menu=openid&cmd=fb)

This is what I want :

1. login using facebook ids
2. save useer unique id to database

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If you are using PHP SDK, you will find examples of how to get user data using the api. Or you will be able to get the user data by using

$userData = json_decode(file_get_contents('https://graph.facebook.com/me?access_token='.$accessToken)); 
var_dump($userData);