code: public function convertToPhpValue($value, Doctrine\DBAL\Platforms\AbstractPlatform $platform)
      {
          if ($value !== null)
          {
              $value= unpack('H*', $value);
              $hash = array_shift($value);
              
              $uuid = substr($hash, 0, 8) . '-' . substr($hash, 8, 4) . '-' . substr($hash, 12, 4) .
                  '-' . substr($hash, 16, 4) . '-' . substr($hash, 20, 12);
                  Zend_Debug::Dump($uuid);
              return $uuid;
          }
      }
docs: {@inheritdoc}