array to xml string and xml string to array helpers

helpers.php

<?php

if (!function_exists('array2xml')) {
    /**
     * Конвертирует массив в xml
     *
     * @param $array
     * @param null|string|SimpleXMLElement $root
     * @param string $version
     * @param string $encoding
     *
     * @return SimpleXMLElement
     */
    function array2xml($array, $root = null, $version = '1.0', $encoding = 'UTF-8')
    {
        if (!($root instanceof \SimpleXMLElement)) {
            $rootName = is_string($root) ? $root : 'root';
            $root = new \SimpleXMLElement('<?xml version="' . $version . '" encoding="' . $encoding . '" ?><' . $rootName . '></' . $rootName . '>');
        }
        foreach ($array as $key => $value) {
            if (is_array($value)) {
                $sub_node = $root->addChild(is_numeric($key) ? 'item' . $key : (string) $key);
                array2xml($value, $sub_node);
            } else {
                $root->addChild((string) $key, htmlspecialchars((string) $value));
            }
        }
        
        return $root->asXML();
    }
}

if (!function_exists('xml2array')) {
    /**
     * Конвертирует xml в массив
     *
     * @param string|SimpleXMLElement $xml
     * @param bool $simplifyFlag
     * @param array $array
     *
     * @return array
     */
    function xml2array($xml, $simplifyFlag = true, $array = [])
    {
        if (!($xml instanceof \SimpleXMLElement)) {
            $xml = new \SimpleXMLElement((string) $xml);
        }
        foreach ($xml->attributes() as $attr => $val) {
            $array['@attributes'][$attr] = (string) $val;
        }
        
        $has_child = false;
        foreach ($xml as $index => $node) {
            $has_child = true;
            $array[$index][] = xml2array($node, $simplifyFlag);
        }
        if (!$has_child) {
            $array['@value'] = (string) $xml;
        }
        foreach ($array as $key => $val) {
            if (is_array($val) && count($val) === 1 && array_key_exists(0, $val)) {
                if ($simplifyFlag && isset($val[0]['@value'])) {
                    $array[$key] = $val[0]['@value'];
                } else {
                    $array[$key] = $val[0];
                }
            }
        }
        
        return $array;
    }
}