PHP解析xml获取特定值

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

$xml = simplexml_load_string($xmlString);

// 获取第一个person的name值
$name = $xml->person[0]->name;
echo $name; // 输出：John Doe

// 获取所有person的age值
foreach ($xml->person as $person) {
    $age = $person->age;
    echo $age . "\n";
}
// 输出：
// 30
// 25

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

$dom = new DOMDocument();
$dom->loadXML($xmlString);

// 获取第一个person的name值
$person = $dom->getElementsByTagName('person')->item(0);
$name = $person->getElementsByTagName('name')->item(0)->nodeValue;
echo $name; // 输出：John Doe

// 获取所有person的age值
$persons = $dom->getElementsByTagName('person');
foreach ($persons as $person) {
    $age = $person->getElementsByTagName('age')->item(0)->nodeValue;
    echo $age . "\n";
}
// 输出：
// 30
// 25