Laravel Referer Tracking

Hello @tolgayigit , I'll suggest to use Middleware where you could check for ?ref_id=10 and make a cookie using the queue method, that way Laravel will set it for you with the next response.

Here are the steps to reproduce:

1. go in terminal and type php artisan make:middleware Referrer and Laravel will generate a class Referrer in app/Http/Middleware
2. in handle method of that class type in the following:

    public function handle($request, Closure $next)
    {
        if($request->has('ref_id')) {
            Cookie::queue('ref_id', $request->get('ref_id'), 43200); // 43200 in minutes are 30 days
        }
        return $next($request);
    }

1. register your middleware in app/Http/Kernel as route middleware, e.g. append 'referrer' => App\Http\Middleware\Referrer::class into protected $routeMiddleware

2. assign 'referrer' to your "home" route in routes/web.php, for example Route::get('/home', 'HomeController@index')->name('home')->middleware('referrer');

And whenever there is ref_id query parameter in your home route (http://www.example.com?ref_id=10) a cookie will be set on the client's browser.

Cheers