<?php

 return [
     //...
     'github' => [
         'client_id'     => 'your-app-id',
         'client_secret' => 'your-app-secret',
         'redirect'      => 'http://localhost/socialite/callback.php',
     ],
     //...
 ];

<?php

namespace App\Http\Controllers;

use Socialite;
use Illuminate\Http\Request;
use Illuminate\Routing\Controller;

class AuthController extends Controller
{
    /**
     * Redirect the user to the GitHub authentication page.
     */
    public function redirectToProvider()
    {
        return redirect()->to(Socialite::create('github')->redirect());
    }

    /**
     * Obtain the user information from GitHub.
     */
    public function handleProviderCallback(Request $request)
    {
        $user = Socialite::create('github')->userFromCode($request->query('code'));

        // $user->getId();
        // $user->getNickname();
        // ...
    }
}

Route::get('/oauth/github', 'AuthController@redirectToProvider');
Route::get('/oauth/github/callback', 'AuthController@handleProviderCallback');