Browser language detection

LocaleMiddleware.php

<?php

namespace App\Http\Middleware;

use Closure;
use Carbon\Carbon;

/**
 * Class LocaleMiddleware.
 */
class LocaleMiddleware
{
    /**
     * Handle an incoming request.
     *
     * @param \Illuminate\Http\Request $request
     * @param \Closure                 $next
     *
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        /*
         * Locale is enabled and allowed to be changed
         */
        if (config('locale.status')) {

            // Do we have a session locale ?
            if(session()->has('locale')) {
                $locale_temp = session()->get('locale');
                if(in_array($locale_temp, array_keys(config('locale.languages')))) {
                    $locale = $locale_temp;
                }
            } else {
                // Else, get the browser locale
                $locale_temp = substr(locale_accept_from_http($request->server('HTTP_ACCEPT_LANGUAGE')), 0, 2);
                if(in_array($locale_temp, array_keys(config('locale.languages')))) {
                    $locale = $locale_temp;
                }
            }

            if (isset($locale)) {

                /*
                 * Set the Laravel locale
                 */
                app()->setLocale($locale);

                /*
                 * setLocale for php. Enables ->formatLocalized() with localized values for dates
                 */
                setlocale(LC_TIME, config('locale.languages')[$locale][1]);

                /*
                 * setLocale to use Carbon source locales. Enables diffForHumans() localized
                 */
                Carbon::setLocale(config('locale.languages')[$locale][0]);

                /*
                 * Set the session variable for whether or not the app is using RTL support
                 * for the current language being selected
                 * For use in the blade directive in BladeServiceProvider
                 */
                if (config('locale.languages')[$locale][2]) {
                    session(['lang-rtl' => true]);
                } else {
                    session()->forget('lang-rtl');
                }
            }
        }

        return $next($request);
    }
}