yupe\components\urlManager\LangUrlManager::replaceLangInUrl PHP Method

    public function replaceLangInUrl($url, $lang = null)
    {
        $parsed = parse_url($url);
        $result = '';
        if (isset($parsed['scheme'])) {
            $result .= $parsed['scheme'] . '://';
        }
        if (isset($parsed['user'])) {
            $result .= $parsed['user'];
            if (isset($parsed['pass'])) {
                $result .= ':' . $parsed['pass'];
            }
            $result .= '@';
        }
        if (isset($parsed['host'])) {
            $result .= $parsed['host'] . '/';
        }
        if ('path' === $this->urlFormat && isset($parsed['path'])) {
            $path = trim($parsed['path'], '/');
            $replaced = preg_replace('#^(' . implode('|', $this->_languages) . '){1}#', $lang, $path);
            $replaced = trim($replaced, '/');
            if ($path === $replaced && null !== $lang) {
                $replaced = $lang;
                if ($path !== '') {
                    $replaced .= '/' . $path;
                }
            }
            $result .= $replaced;
            if ($result !== '') {
                if (strpos($url, '/') === 0) {
                    $result = '/' . $result;
                }
                if (substr($url, -1) === '/') {
                    $result .= '/';
                }
            }
        }
        if ('get' === $this->urlFormat) {
            $queryParams = [];
            if (isset($parsed['query'])) {
                parse_str($parsed['query'], $queryParams);
            }
            if (null === $lang && isset($queryParams[$this->langParam])) {
                unset($queryParams[$this->langParam]);
            } else {
                $queryParams[$this->langParam] = $lang;
            }
            $query = urldecode(http_build_query($queryParams));
            if ($query !== '') {
                $result .= '?' . $query;
            }
        }
        if ($result === '') {
            $result .= '/';
        }
        return $result;
    }

 /**
  * Обработка запроса
  *
  * @param mixed $event
  * @return void
  */
 public function handleLanguageBehavior($event)
 {
     /* @var $request \CHttpRequest */
     $request = Yii::app()->getRequest();
     $current = $this->lm->getCurrentLang();
     $this->setLanguage($current);
     $default = $this->lm->getDefaultLang();
     $fromUrl = $this->lm->getLangFromUrl();
     if (null === $fromUrl && $current !== $default) {
         $request->redirect($this->lm->replaceLangInUrl($request->getUrl(), $current));
     }
     if (null !== $fromUrl && $current === $default) {
         $request->redirect($this->lm->removeLangFromUrl($request->getUrl()));
     }
 }