Laravel: Only allowing one session per user at a time

Yeah, I did similar for my project.

So, you need add to your user model another attribute in this case: last_sessid.

public function swapping($user) {
    $new_sessid   = \Session::getId(); //get new session_id after user sign in
    $last_session = \Session::getHandler()->read($user->last_sessid); // retrive last session

    if ($last_session) {
        if (\Session::getHandler()->destroy($user->last_sessid)) {
            // session was destroyed
        }
    }

    $user->last_sessid = $new_sessid;
    $user->save();
}

Now, if the user has an active session, and signs in another browser, the first session will be removed.

P.S. Sorry for my bad english :)

For laravel 5.2 after executing the make:auth command you can create the method:public function authenticated(Request $request,User $user) in the AuthController.php and in that method you can do what you want after login. For a single session per user we add to the AuthController at top:

use Illuminate\Http\Request;
use Auth;

And add the function:

public function authenticated(Request $request,User $user){
    $previous_session = $user->session_id;

    if ($previous_session) {
        \Session::getHandler()->destroy($previous_session);
    }

    Auth::user()->session_id = \Session::getId();
    Auth::user()->save();
    return redirect()->intended($this->redirectPath());
}

Remember to add the migration for altering your users table with the session_id column.