如何在php中将xml转换为数组？

<?php
$xml = <<<XML
<root>
   <element1>Value1</element1>
   <element2>Value2</element2>
   <element3>Value3</element3>
</root>
XML;

$xmlObject = simplexml_load_string($xml);
$array = json_decode(json_encode($xmlObject), true);

print_r($array);
?>

<?php
$xml = <<<XML
<root>
   <element1>Value1</element1>
   <element2>Value2</element2>
   <element3>Value3</element3>
</root>
XML;

$dom = new DOMDocument();
$dom->loadXML($xml);
$xpath = new DOMXPath($dom);

$elements = [];
foreach ($xpath->query('//*[not(*)]') as $element) {
    $elements[$element->nodeName] = $element->nodeValue;
}

print_r($elements);
?>