readString example

            case 0:
                $value = $this->readDouble();
            break;

            // Boolean             case 1:
                $value = $this->readBoolean();
                break;

            // String             case 2:
                $value = $this->readString();
                break;

            // Object             case 3:
                $value = $this->readObject();
                break;

            // null             case 6:
                return null;

            

private function readString() {
    if (!isset($this->result)) {
      $this->result = $this->loadStrings();
    }
    return array_shift($this->result);
  }

  /** * {@inheritdoc} */
  public function readItem() {
    if ($string = $this->readString()) {
      $values = (array) $string;
      $po_item = new PoItem();
      $po_item->setFromArray($values);
      return $po_item;
    }
  }

}