Manually created XML for soapVar()

getOrderResult.php

<?php

namespace SoapSapBridge\Server\Action\GetOrder\Nodes;

/**
 * Class GetOrdersResult
 * @package SoapSapBridge\Server\Model\GetOrdersModel
 */
class GetOrdersResult {
    /**
     * @var \ArrayObject
     */
    public $DOC;

    /**
     * Array of orders
     * GetOrdersResult constructor.
     */
    public function __construct()
    {
        $this->DOC = new \ArrayObject();
    }

    /**
     * DOM documents since lots of attributes needs to be added
     * @param DOC[] $ORDERS
     * @param int $orderId
     * @param string $orderDate
     * @param string $name
     * @param string $shipAddress
     * @param string|null $shipAddress2
     * @param string|null $shipState
     * @param string|null $shipCity
     * @param string|null $shipPostalCode
     * @param string|null $shipCountry
     * @param string $customerShippingCost
     * @param string $salesTax1
     * @param string $salesTax2
     * @param string $salesTax3
     * @param string|null $emailAddress
     * @param string|null $actualShippingCost
     * @param string|null $gateway
     * @param string|null $totalValue
     */
    public function addOrder(
        array $ORDERS,
        int $orderId,
        string $orderDate,
        string $name,
        string $shipAddress,
        string $shipAddress2 = null,
        string $shipState = null,
        string $shipCity = null,
        string $shipPostalCode = null,
        string $shipCountry = null,
        string $customerShippingCost = '0.0000',
        string $salesTax1 = '0.0000',
        string $salesTax2 = '0.0000',
        string $salesTax3 = '0.0000',
        string $emailAddress = null,
        string $actualShippingCost = null,
        string $gateway = 'UPS',
        string $totalValue = null
    ) {
        $xml = new \DOMDocument();
        $orderNode = $xml->createElement('ORDERS');
        $orderNode->setAttribute('ORDERID', $orderId);
        $orderNode->setAttribute('ORDERDATE', $orderDate);
        $orderNode->setAttribute('NAME', $name);
        $orderNode->setAttribute('SHIPADDRESS1', $shipAddress);
        $orderNode->setAttribute('SHIPADDRESS2', $shipAddress2);
        $orderNode->setAttribute('SHIPSTATE', $shipState);
        $orderNode->setAttribute('SHIPCITY', $shipCity);
        $orderNode->setAttribute('SHIPPOSTALCODE', $shipPostalCode);
        $orderNode->setAttribute('SHIPCOUNTRY', $shipCountry);
        $orderNode->setAttribute('CUSTOMERSHIPPINGCOST', $customerShippingCost);
        $orderNode->setAttribute('SALESTAX1', $salesTax1);
        $orderNode->setAttribute('SALESTAX2', $salesTax2);
        $orderNode->setAttribute('SALESTAX3', $salesTax3);
        $orderNode->setAttribute('EMAILADDRESS', $emailAddress);
        $orderNode->setAttribute('ACTUALSHIPPINGCOST', $actualShippingCost);
        $orderNode->setAttribute('GATEWAY', $gateway);
        $orderNode->setAttribute('TOTALVALUE', $totalValue);
        foreach ($ORDERS as $ORDER) {
            $imported = $xml->importNode($ORDER->ORDERDETAILS);
            $orderNode->appendChild($imported);

        }

        $this->DOC -> append(new \SoapVar($xml->saveXML($orderNode), XSD_ANYXML));
    }
}