catalog/controller/startup/language.php

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<?php
class ControllerStartupLanguage extends Controller {
	public function index() {
		if (isset($this->request->get['language_id']) && isset($this->request->get['route']) && $this->request->get['route'] != 'common/language/language') {

		}

		// Add rewrite to url class
		$this->url->addRewrite($this);
	}

	public function rewrite($link) {
		$url_info = parse_url(str_replace('&amp;', '&', $link));

		$url = '';

		$data = array();

		parse_str($url_info['query'], $data);

		if ($url) {
			unset($data['route']);

			$query = '';

			if ($data) {
				foreach ($data as $key => $value) {
					$query .= '&' . rawurlencode((string)$key) . '=' . rawurlencode((is_array($value) ? http_build_query($value) : (string)$value));
				}

				if ($query) {
					$query = '?' . str_replace('&', '&amp;', trim($query, '&'));
				}
			}

			return $url_info['scheme'] . '://' . $url_info['host'] . (isset($url_info['port']) ? ':' . $url_info['port'] : '') . str_replace('/index.php', '', $url_info['path']) . $url . $query;
		} else {
			return $link;
		}
	}
}