PHP / Magento Convert array to XML

ArrayToXML.php

<?php


class Helper_Xml
{
    protected function _arrayToXmlRecursive($arrData, $addCdata = false, $parentKey = '', &$isNumericCallback = false)
    {
        $xml = '';
        $xmlModel = new Varien_Simplexml_Element('<node></node>');
        foreach ($arrData as $fieldName => $fieldValue) {
            $isNumericChildArr = false;

            if (!empty($parentKey) AND is_numeric($fieldName)) {
                $fieldName = $parentKey;
            }

            if (is_array($fieldValue)) {

                $isNumericChildArr = !$this->_isAssoc($fieldValue);
                $fieldValue = $this->_arrayToXmlRecursive($fieldValue, $addCdata, $fieldName);
            }

            if ($addCdata === true) {
                $fieldValue = "<![CDATA[$fieldValue]]>";
            }

            if ($isNumericChildArr) {
                $xml .= "$fieldValue";
            } else {
                $xml .= "<$fieldName>$fieldValue</$fieldName>";
            }

        }

        return $xml;
    }

    protected function _isAssoc(array $arr)
    {
        if (array() === $arr) return false;
        return array_keys($arr) !== range(0, count($arr) - 1);
    }

    public function toXml($arrData, $rootName = 'item', $addOpenTag = false, $addCdata = true)
    {
        $xml = '';
        if ($addOpenTag) {
            $xml .= '<?xml version="1.0" encoding="UTF-8"?>' . "\n";
        }
        if (!empty($rootName)) {
            $xml .= '<' . $rootName . '>';
        }

        $xml .= $this->_arrayToXmlRecursive($arrData, $rootName, $addOpenTag, $addCdata);

        if (!empty($rootName)) {
            $xml .= '</' . $rootName . '>';
        }
        return $xml;
    }
}