slim-locale.php

/* Set default locale from the first parameter in url. */
$app->add(function ($request, $response, $next) {
    $params = $request->getAttribute("routeInfo")[2];
    if (empty($params["locale"])) {
        Locale::setDefault("et");
    } else {
        Locale::setDefault($params["locale"]);
    }
    return $next($request, $response);
});

$app->get("/{locale:et|lv|lt|ru-ee|ru-lv|ru-lt}[/{dealer}]", function ($request, $response, $arguments) {
    $data["locale"] = Locale::getDefault(); /* ru-ee */
    $data["language"] = Locale::getPrimaryLanguage($data["locale"]); /* ru */
});