How can I use variables globally in Blade templates

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I want use $unreadMessages in my layout but I don't know which controller is used globally for layouts. It is in dashboardController, but I get this error:

Undefined variable: unreadMessages (View: /myhost/resources/views/layouts/app.blade.php) (View: / myhost/resources/views/layouts/app.blade.php)

In which controller can I define this variable so I can use it globally?

This code is for $unreadMessages in the dashboardController:


class DashboardController extends Controller

    public function index()
        $unreadMessages = TicketMessage::where(['is_read' => 0])->whereIn('ticket_id', $ticketIds)->whereNotIn('user_id', [Auth::user()->id])->count();

        return view('dashboard', compact(

you can resolve this issue by using the following code in Route.php file:

view()->share('unreadMessages', $unreadMessages);

How can I use variables globally in Blade templates, you can resolve this issue by using the following code in Route.php file: view()->​share('unreadMessages', $unreadMessages);. You may specify which attributes should be considered data variables using the @props directive at the top of your component's Blade template. All other attributes on the component will be available via the component's attribute bag.

How to set a variable inside Laravel's blade template, It is not recommended to declare variables inside blade templates, blade's Use the Blade @php directive to execute a block of plain PHP within your template:. It is not recommended to declare variables inside blade templates, blade’s purpose is to render the view with the values which comes from the controller., but there arise a situation you may need some iterators or flags to declare inside the blade., you can declare using the following syntax. if it is a single line.,

You can do that with a ServiceProvider, in the boot function, for example :

 public function boot() {

    view()->composer([''],function($view) {
        $unreadMessages = TicketMessage::where(['is_read' => 0])->whereIn('ticket_id', $ticketIds)->whereNotIn('user_id', [Auth::user()->id])->count();

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