How to determine the provider when authorizing through social networks?

Question

PHP

I made authorization through social networks (Vkontakte for example):
If you want to log in through VK, the user clicks on a link like this:

http://oauth.vk.com/authorize?client_id=3333333&redirect_uri=http://mysite/index.php?do=auth_social&provider=vk&response_type=code

And everything seems to be fine, authorization works, but I get this in response:

http://mysite/index.php?do=auth_social&code=1428c3455fg4c9cc9ab

those. is not returned to me $_GET['provider'] == 'vk', so I cannot determine through which social network the user logged in.
Or is it done in some other way?

Answer 1

Try like this:
You are trying to pass url to urle.
For url arguments in php use php.net/manual/ru/function.urlencode.php

Answer 2

in your case, I see an option, just check the href attribute with js and send the post to the server with Ajax,
but in general, I would do this: I would
force users to click on links like
/auth/provider/vkontakte
...
And there already Location: oauth.vk. co ...