Piwik\Site::clearCacheForSite PHP Method

    public static function clearCacheForSite($idSite)
    {
        $idSite = (int) $idSite;
        unset(self::$infoSites[$idSite]);
    }

 /**
  * Saves (persists) the current setting values in the database.
  */
 public function save($values)
 {
     $model = $this->getModel();
     foreach ($values as $key => $value) {
         if (!in_array($key, $this->allowedNames)) {
             unset($values[$key]);
             continue;
         }
         if (is_array($value) && in_array($key, $this->commaSeparatedArrayFields)) {
             $values[$key] = implode(',', $value);
         } elseif (is_bool($value)) {
             $values[$key] = (int) $value;
         }
     }
     if (!empty($values['urls'])) {
         $urls = array_unique($values['urls']);
         $values['main_url'] = array_shift($urls);
         $model->deleteSiteAliasUrls($this->idSite);
         foreach ($urls as $url) {
             $model->insertSiteUrl($this->idSite, $url);
         }
     }
     unset($values['urls']);
     $model->updateSite($values, $this->idSite);
     Site::clearCacheForSite($this->idSite);
 }