AppServiceProvider在laravel 5中不起作用

Question

Here is my app.php code where I use AppServiceProvider :

/*
     * Application Service Providers...
     */
    'App\Providers\AppServiceProvider',
    'App\Providers\BusServiceProvider',
    'App\Providers\ConfigServiceProvider',
    'App\Providers\EventServiceProvider',
    'App\Providers\RouteServiceProvider',

And here is my AppServiceProvider boot function. I want to use $a in pages.companyname page. I'm trying to do this so I can use that value on every page:

public function boot()
    {
        //
        $a = 10;
        view()->composer('pages.companyname', function($view)
    {
        $view->with('latest', $a);
    });    
    }

This is my pages/companyname.blade.php page :

{!! $latest !!}

But It's showing this error

"Undefined variable: latest "

I followed this example

How can I solve this? I want to use one variable across my pages..

N.B : Now $a is a demo variable. I will replace it by SQL query.

Answer 1

When you need to pass a variable into a closure, you use use.

$a = 10;
view()->composer('pages.companyname', function($view) use ($a)
{
    $view->with('latest', $a);
});