Compairing URL segment to show different content depending on segment.
<?php $uriSegments = explode("/", parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH)); ?>
<?php if ($uriSegments[1] == "en") { ?>
<?php $this->inc('elements/main-nav-english.php'); ?>
<?php } elseif ($uriSegments[1] == "de") { ?>
<?php $this->inc('elements/main-nav-german.php'); ?>
<?php } elseif ($uriSegments[1] == "ru") { ?>
<?php $this->inc('elements/main-nav-russian.php'); ?>
<?php } ?>