如何在PHP中从包含xml数据的变量中提取子字符串

$xmlData = '<root>
    <person>
        <name>John Doe</name>
        <age>30</age>
    </person>
    <person>
        <name>Jane Smith</name>
        <age>25</age>
    </person>
</root>';

// 将XML数据加载到SimpleXMLElement对象中
$xml = new SimpleXMLElement($xmlData);

// 提取子字符串
$name = $xml->person[0]->name;
$age = $xml->person[0]->age;

echo "Name: " . $name . "<br>";
echo "Age: " . $age . "<br>";