PHP function for convert array to SimpleXMLElement object

arrayToXml.php

<?php

namespace Enso;

use SimpleXMLElement;

/**
 * Converts array to XML object.
 * Note: attribute keys must prefix '@'.
 *
 * @param iterable $data Source data.
 * @param string|SimpleXMLElement $parent Parent XML tag.
 * @param string $charset Encoding of the XML document.
 * @return SimpleXMLElement
 */
function arrayToXml(iterable $data, $parent, string $charset = 'UTF-8'): SimpleXMLElement
{ 
    if (\is_string($parent)) {
        $parent = new SimpleXMLElement(
            '<?xml version="1.0" encoding="' . $charset . '"?><' . $parent . '/>',
            \LIBXML_BIGLINES | \LIBXML_NONET
        );
    }

    foreach ($data as $name => $value) {
        if (\is_object($value) && !$value instanceof \Traversable) {
            $value = \method_exists($value, '__toString') ? (string) $value : \get_object_vars($value);
        }
        if (\is_iterable($value)) {
            arrayToXml($value, $parent->addChild($name), $charset);
        } elseif (\is_string($name) && $name[0] === '@') {
            $parent->addAttribute($name, \htmlspecialchars($value, \ENT_XML1, $charset));
        } else {
            $parent->addChild($name, \htmlspecialchars($value, \ENT_XML1, $charset));
        }
    }

    return $parent;
}