How can the website know what social network (postal) a man came into PHP?

[Amritpal]

Subject matter: There's a website that registers through different services: yandex, mail, vk, facebook, etc. Rapid registration helps https://ulogin.ru/ Now, I need to find out what service a man comes from and uses some kind of activity as different for different services, to get a user avatar. In brief, I have to get a user avatar from services.

[Mystic]

I didn't work with the service, but it's all on the page of the viewing page and the pages of the documentation.

(1) That's right. https://ulogin.ru/help.php#fields )

You need avatar, you need a key. photo or photo_big parameter fields Your view. Accordingly, the supply code will be approximately as follows

<script src="//ulogin.ru/js/ulogin.js"></script>
<div id="uLogin" data-ulogin="display=small;fields=first_name,last_name,photo_big,photo;providers=vkontakte,odnoklassniki,mailru,facebook;hidden=other;redirect_uri=http%3A%2F%2F"></div>

(2) To obtain the necessary data ( https://ulogin.ru/help.php#custom )

On your website, where the services are being redirected, it is necessary to process the data from the service and request information on the user:

                $s = file_get_contents('http://ulogin.ru/token.php?token=' . $_POST['token'] . '&host=' . $_SERVER['HTTP_HOST']);
                $user = json_decode($s, true);
                //$user['network'] - соц. сеть, через которую авторизовался пользователь
                //$user['identity'] - уникальная строка определяющая конкретного пользователя соц. сети
                //$user['photo_big'] - большое фото
                //$user['photo'] - фото 100х100

If you were self-sustained to record through the service data (not cms with plastic), then you were supposed to get a token from the service and ask him for data on the user. https://ulogin.ru/help.php#custom You'll have enough to add the key to the view, and you'll see the data you need in the body.