laravel multi-language switch and change locale on load - laravel

Question

I've implemented the language switch functionality following this post and it works perfectly but just when you click on the language switch, though I would like to change the locale and store it in the App when the page is loaded.
My function it's a bit different from the one in the post, I've added an else if just to make sure that the locale it's in the accepted languages
App/Middleware/Localization.php
public function handle($request, Closure $next)
{
$availableLangs = array('en', 'hu', 'pt', 'ro', 'sv');
$userLangs = substr($request->server('HTTP_ACCEPT_LANGUAGE'), 0, 2);
if (\Session::has('locale'))
{
\App::setlocale(\Session::get('locale'));
}
else if (in_array($userLangs, $availableLangs))
{
\App::setLocale($userLangs);
// Session::push('locale', $userLangs);
}
return $next($request);
}
How can I reuse this function or create a new function to achieve the same result but when you load the website?
I have a lot of route so I think that I will need a function in order to don't repeat the same code over and over.
I don't use the locale on the URL and I don't want to use it, so please don't propose a solution that includes that option.
Example of my URLS (each URL can be view with all the available languages)
domain/city1/
domain/city1/dashboard/
domain/city2/
domain/city2/dashboard/
domain/admin/
I don't want:
domain/city1/en/...
domain/city1/pt/...

Answer 1

Probably you need something like this, whenever the page load initially there won't be any server value so it cannot set value for the $userLangs variable. So as per your code, the if statement fails since there is no session value and the elseif condition also fails since there is no value set for $userLangs which cannot be found in the $availableLangs. Just add one else condition to set a default lanuage of the website when there is no prefered user language.
public function handle($request, Closure $next)
{
$availableLangs = array('en', 'hu', 'pt', 'ro', 'sv');
$userLangs = substr($request->server('HTTP_ACCEPT_LANGUAGE'), 0, 2);
if (\Session::has('locale'))
{
\App::setlocale(\Session::get('locale'));
}
else if (in_array($userLangs, $availableLangs))
{
\App::setLocale($userLangs);
Session::put('locale', $userLangs);
}
else {
\App::setLocale('en');
Session::put('locale', 'en');
}
return $next($request);
}