Moazzam

I want a PHP code to find the userID of a Facebook Account using Access Token. My form is like this:

I have 100 Active Facebook access tokens. For each account I have more than one access token. I want to keep only one token for each account and want to delete the others. And i don't want to do this manually so please post a PHP script which check all the tokens and keep only one active token for each account. These tokens are present in a folder named "tok3ns".