/** * F5 validation procedure */ private function F5Validation() { $operation_code = self::GetParameter('operation_code'); if ($operation_code != '' && Session::IsExists($this->uPrefix . '_operation_code') && Session::Get($this->uPrefix . '_operation_code') == $operation_code) { $this->error = _OPERATION_WAS_ALREADY_COMPLETED; return false; } return true; }