Checking which `guard` is loggedin

One way to do this is to extend the Laravel authentication class in the IoC container to include, for instance, a name() method that check which guard is used for the current session, and calls user() on that Guard instance.

Another way is to simply use an if-statement in your Blade template:

@if(Auth::guard('admin')->check())
    Hello {{Auth::guard('admin')->user()->name}}
@elseif(Auth::guard('user')->check())
    Hello {{Auth::guard('user')->user()->name}}
@endif

However, this is a little dirty. You can clean this up a bit by using a partial, or by passing the view a variable containing the guard name, either directly from your Controller, or via a ViewComposer, and then doing:

Hello {{Auth::guard($guardName)->user()->name}}

in your View.

Extending Laravel's authentication is your best option, imo.

In new versions of laravel use:

Auth::getDefaultDriver()

I recommend to use global helper function like

function activeGuard(){

foreach(array_keys(config('auth.guards')) as $guard){

    if(auth()->guard($guard)->check()) return $guard;

}
return null;
}

This will get the guard name that is used for current logged in user

Auth::getDefaultDriver()

When you log in, by default it will get you the:

'web'

Dependable through which guard you've been logged in it will get you that guard name.

This is not applicable for APIs!!! Because APIs in laravel by default don't use session.

Since Laravel 5.5, this is easy to do with the @auth template directive.

@auth("user")
    You're a user!
@endauth

@auth("admin")
    You're an administrator!
@endauth

@guest
    You're not logged in!
@endguest

Reference: https://laravel.com/docs/5.6/blade#if-statements