Make a variable available in all controllers - php

Question

I am not sure the title of the question is clear, so I will try to explain it in details.
I want to execute a piece of code in every controller automatically, assign the result to a variable that will be globally accessible everywhere.
So the code that need to be run will be like this:
function getLanguage() {
session('lang') ? session('lang') : 'en';
}
$LANG = getLanguage();
In any controller I need to access that variable like this:
myModel::all($LANG);
Also in the view, it would be helpful to access that variable as well (if possible)
<div> User language: {{$LANG}}</div>
Is there any place where I can execute that piece of code automatically?

Answer 1

Create a middleware
Add new middleware to App\Http\Kernels $middleware property, if you want it to run on every request. You may also put into $middlewareGroups property's web key.
Your middleware's handle method will be like this
public function handle(Request $request, Closure $next)
{
Config::set('some-name.some-sub-name', session('lang') ?: 'en');
return $next($request);
}
You will be updating a config in your middleware. This config has to be set only in this middleware to prevent possible problems of shared global state. (it is also important to be unique)
Then you can use it with config('some-name.some-sub-name')

Answer 2

In your use-case, you should implement a global middleware which sets the locale as you wish
<?php
namespace App\Http\Middleware;
use Closure;
use Illuminate\Session\SessionManager;
use Illuminate\Contracts\Foundation\Application;
class CheckLocale
{
/**
* The application instance.
*
* #var \Illuminate\Contracts\Foundation\Application
*/
protected $app;
/**
* The session manager instance.
*
* #var \Illuminate\Session\SessionManager
*/
protected $sessionManager;
public function __construct(Application $app, SessionManager $sessionManager)
{
$this->app = $app;
$this->sessionManager = $sessionManager;
}
/**
* Handle an incoming request.
*
* #param \Illuminate\Http\Request $request
* #param \Closure $next
* #param string|null $guard
* #return mixed
*/
public function handle($request, Closure $next, $guard = null)
{
$this->app->setLocale($this->sessionManager->get('lang', 'en'));
return $next($request);
}
}
After setting it as a global middleware, you can access it wherever you need it from a controller or view
Controller
public function foo(Application $app)
{
$lang = $app->getLocale();
}
In a Blade view
#inject('app', Illuminate\Contracts\Foundation\Application::class)
{{ $app->getLocale() }}
For any other variable, you may directly use Laravel container
In a service provider register method:
$this->app->singleton('lang', function ($app) {
return $app['session']->get('lang', 'en');
});
And wherever else
app('lang');