php xml to array

gistfile1.php

<?php 

function xmlToArray(string $xml)
{
    $doc = new DOMDocument();
    $doc->loadXML($xml);
    $root = $doc->documentElement;
    $output = domNodeToArray($root);
    $output['@root'] = $root->tagName;
    return $output;
}

function domNodeToArray($node)
{
    $output = [];
    switch ($node->nodeType) {
        case XML_CDATA_SECTION_NODE:
        case XML_TEXT_NODE:
            $output = trim($node->textContent);
            break;
        case XML_ELEMENT_NODE:
            for ($i = 0, $m = $node->childNodes->length; $i < $m; $i++) {
                $child = $node->childNodes->item($i);
                $v = domNodeToArray($child);
                if (isset($child->tagName)) {
                    $t = $child->tagName;
                    if (!isset($output[$t])) {
                        $output[$t] = [];
                    }
                    $output[$t][] = $v;
                } elseif ($v || $v === '0') {
                    $output = (string)$v;
                }
            }
            if ($node->attributes->length && !is_array($output)) { //Has attributes but isn't an array
                $output = ['@content' => $output]; //Change output into an array.
            }
            if (is_array($output)) {
                if ($node->attributes->length) {
                    $a = [];
                    foreach ($node->attributes as $attrName => $attrNode) {
                        $a[$attrName] = (string)$attrNode->value;
                    }
                    $output['@attributes'] = $a;
                }
                foreach ($output as $t => $v) {
                    if (is_array($v) && count($v) === 1 && $t !== '@attributes') {
                        $output[$t] = $v[0];
                    }
                }
            }
            break;
    }
    return $output;
}


$xml_string = <<<XML
<?xml version='1.0' standalone='yes'?>
<movies>
 <movie>
  <rating type="thumbs">7</rating>
  <rating type="stars">5</rating>
 </movie>
</movies>
XML;

$t = xmlToArray($xml_string);