PHP 函数如何与 XML 交互

$xmlDoc = simpleXML_load_file('data.xml');
echo $xmlDoc->title; // 输出 XML 中的标题

$dom = new DOMDocument();
$dom->load('data.xml');
$title = $dom->getElementsByTagName('title')->item(0)->nodeValue;

$dom = new DOMDocument();
$root = $dom->createElement('item');
$dom->appendChild($root);

$name = $dom->createElement('name', 'John Doe');
$root->appendChild($name);

$dom->save('data.xml');

$dom = new DOMDocument();
$dom->load('data.xml');

$xpath = new DOMXPath($dom);
$node = $xpath->query("//item[@id='1']")->item(0);
$node->setAttribute('active', 'true');

$dom->save('data.xml');

<items>
  <item id="1">
    <title>Item A</title>
  </item>
  <item id="2">
    <title>Item B</title>
  </item>
</items>

$items = simpleXML_load_file('items.xml');
foreach ($items->item as $item) {
  echo $item->title . PHP_EOL;
}

$dom = new DOMDocument();
$dom->load('items.xml');

$xpath = new DOMXPath($dom);
$titles = $xpath->query("//item[@id='1']/title");
echo $titles->item(0)->nodeValue; // 输出 "Item A"