use varable on all site pages laravel

public function handle($request, Closure $next)
{
    if (!Session::has('website_name')) {
        // some logic
        Session::put('website_name', 'YOUR VALUE');
    }

    return $next($request);
}

{{Session::get('website_name', 'Value Goes Here')}}

# app/Providers/AppServiceProvider.php

public function boot()
{
   // add this
    view()->share('someKey', 'This is shared data');
}

View::composer('*', function($view)
{
    $view->with('website_name', 'My website');
});

Config::get('app.name')

php artisan make:middleware SomeMiddleware