private function buildPriceOption(TPPriceOption $po, $index)
 {
     $map = array();
     $map["price"] = $this->nuller($po->getPrice());
     $map["exp"] = $this->nuller($po->getAccessPeriod());
     if ($po->getStartDateInSecs() != null && $po->getStartDateInSecs() != 0) {
         $map["sd"] = $this->nuller($po->getStartDateInSecs());
     }
     if ($po->getEndDateInSecs() != null && $po->getEndDateInSecs() != 0) {
         $map["ed"] = $this->nuller($po->getEndDateInSecs());
     }
     $map["cpt"] = $this->nuller($po->getCaption());
     if (count($po->getSplitPays()) > 0) {
         $splits = array();
         foreach ($po->getSplitPays() as $email => $amount) {
             array_push($splits, "{$email}={$amount}");
         }
         $map["splits"] = $splits;
     }
     return $map;
 }