如何将数据从DB传递到Laravel 5中除admin以外的所有视图？

I want to send data from database to my front end header menu for category listing. But I don't want to send these data to my Admin views as these are irrelevant. Should I use Service Providers or any better approach?

You can do something like the following within the boot method of the AppServiceProvider:

View::composer('*', function($view)
{
    if(Auth::user()->is_admin == false) {
        $view->with('menuCategories', Category::all());
    }
});

The * means all views will receive $menuCategories.

Later on you can extract it to a dedicated ServicePovider.