Set a default locale for your application in Zend Framework 2

Module.php

<?php
namespace Application;

use Locale;
use Zend\EventManager\Event;
use Zend\ModuleManager\Feature;

class Module implements
    Feature\BootstrapListenerInterface
{
    public function onBootstrap(Event $e)
    {
        $default   = 'nl';
        $supported = array('en', 'en-GB');
        $app       = $e->getApplication();
        $headers   = $app->getRequest()->getHeaders();

        if ($headers->has('Accept-Language')) {
            $locales = $headers->get('Accept-Language')->getPrioritized();

            // Loop through all locales, highest priority first
            foreach ($locales as $locale) {
                if (!!($match = Locale::lookup($supported, $locale))) {
                    // The locale is one of our supported list
                    Locale::setDefault($match);
                    break;
                }
            }
            if (!$match) {
                // Nothing from the supported list is a match
                Locale::setDefault($default);
            }
        } else {
            Locale::setDefault($default);
        }
    }
}

Stumbled onto this, thanks. Had to make a slight revision to make it work.

$locales = $headers->get('Accept-Language')->getPrioritized();
/** @var LanguageFieldValuePart $locale */
foreach ($locales as $locale){
    if( !!($match = Locale::lookup($other_locales, $locale->getTypeString() )) )

Thanks very much vor this snippet, which has worked for us very well until now. Unfortunately, recently we discovered a bug.
Think of the following:

$default   = 'de_DE';
$supported = array('de_DE', 'en-GB');

The system also includes language files for exactly those locales.

Now, along comes a visitor:

Accept-Language: de,en-US;q=0.7,en;q=0.3`

Theory: He would get to see a German application.
Fact: He gets the English version.

We need to extend the snippet to also include sublocales or related locales (de_AT etc.) in its search. Currently working on that.