How to read data via a URL with PHP

Question

I am trying to make my online app communicate with Facebook. According to their documentation in order to authenticate my users I need to redirect them to the oAuth dialog, with this URL:

https://www.facebook.com/dialog/oauth?client_id=YOUR_APP_ID&redirect_uri=YOUR_URL

So far so good. If the user grants me permission Facebook will redirect him to the URL I specified on my request, appending a code to it. Like this:

http://YOUR_URL?code=A_CODE_GENERATED_BY_SERVER

Question: how do I read that code with my PHP script?

Answer 1

So the response URL should be like http://youdomain.com/controller.php?code=A_CODE_GENERATED_BY_SERVER

in your controller.php

$_REQUEST['code']

Answer 2

With $_GET:

echo $_GET['code'];