Question

我有一个XML字符串，下面的代码段：

<?xml version="1.0"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"
       xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
    <soap:Body>
        <SendPurchases xmlns="urn:services.insurance">
            <Partner>
                <UserID>MyCompany</UserID>
                <Password>ABC123</Password>
            </Partner>
            <PurchasesRequest>
                <Total>100</Total> 
            </PurchasesRequest>
        </SendPurchases>
    </soap:Body>
</soap:Envelope>

我正在将XML转换为DOMDocument以使操作“更容易”：

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

然后我想操纵某些值，最好使用它们的路径：

$elements = $xpath->query('/soap:Envelope/soap:Body/SendPurchases/Partner/UserID');

但是上面的查询没有返回任何结果。

事实上，当我遍历文档中的所有元素时：

foreach ($doc->getElementsByTagName('*') as $node) {
    echo $node->getNodePath() . "\n";
}

它返回如下内容：

/soap:Envelope/soap:Body
/soap:Envelope/soap:Body/*
/soap:Envelope/soap:Body/*/*[1]
/soap:Envelope/soap:Body/*/*[1]/*[1]
/soap:Envelope/soap:Body/*/*[1]/*[2]
/soap:Envelope/soap:Body/*/*[2]
/soap:Envelope/soap:Body/*/*[2]/*[1]

正如您所看到的，<soap:Body>内的所有元素都被替换为星号和索引而不是元素名称。

沿着该路径查询有效，但对我来说维护并不容易，我更倾向于使用元素名称。

Answer 1

感谢@Dekel的提示。我需要注册两个名称空间，然后在查询时指定名称空间：

$xpath = new DOMXPath($doc);
$xpath->registerNamespace('soap', 'http://schemas.xmlsoap.org/soap/envelope/');
$xpath->registerNamespace('insr', 'urn:services.insurance');

$elements = $xpath->query('/soap:Envelope/soap:Body/insr:SendPurchases/insr:Partner/insr:UserID');

现在它正在运作。

Answer 2

另一种选择是use local-name()：

$xml = '<?xml version="1.0"?>
    <soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"
           xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
        <soap:Body>
            <SendPurchases xmlns="urn:services.insurance">
                <Partner>
                    <UserID>MyCompany</UserID>
                    <Password>ABC123</Password>
                </Partner>
                <PurchasesRequest>
                    <Total>100</Total> 
                </PurchasesRequest>
            </SendPurchases>
        </soap:Body>
    </soap:Envelope>';
$doc = new DOMDocument();
$doc->loadXML($xml);
$xpath = new DOMXPath($doc);

$elements = $xpath->query("//*[local-name()='UserID']");

var_dump($elements->item(0)->nodeValue);
// string(9) "MyCompany"

Answer 3

我快速而肮脏的解决方案：

$path = $oNode->getNodePath(); #eg. /*/*[2]/*
while ($oNode) {
    $path = preg_replace('~(.*/)[*]~', '$1'.$oNode->localName, $path, 1);
    $oNode = $oNode->parentNode;
}
$path; #eg. /root/node[2]/subnode

DOMXPath路径显示为星号

3 个答案: