php之使用 PHP 查找所有 XML 命名空间 URI

假设我在 XML 文档中有以下命名空间:

xmlns="http://mws.amazonservices.com/schema/Products/2011-10-01" 
xmlns:ns2="http://mws.amazonservices.com/schema/Products/2011-10-01/default.xsd" 

这是 XML 文档:

<?xml version="1.0"?> 
<GetMatchingProductForIdResponse xmlns="http://mws.amazonservices.com/schema/Products/2011-10-01"> 
<GetMatchingProductForIdResult Id="B0009VCOU4" IdType="ASIN" status="Success"> 
    <Products xmlns="http://mws.amazonservices.com/schema/Products/2011-10-01" xmlns:ns2="http://mws.amazonservices.com/schema/Products/2011-10-01/default.xsd"> 
    <Product> 
        <Identifiers> 
            <MarketplaceASIN> 
                <MarketplaceId>ATVPDKIKX0DER</MarketplaceId> 
                <ASIN>B0009VCOU4</ASIN> 
            </MarketplaceASIN> 
        </Identifiers> 
        <AttributeSets> 
            <ns2:ItemAttributes xml:lang="en-US"> 
                <ns2:Binding>Electronics</ns2:Binding> 
                <ns2:Brand>DOBANI</ns2:Brand> 
                <ns2:Feature>Handcrafted Quality, Value Priced</ns2:Feature> 
                <ns2:Feature>Satisfaction Guaranteed! 30-Day Return Policy!</ns2:Feature> 
                <ns2:ItemDimensions> 
                    <ns2:Height Units="inches">7.00</ns2:Height> 
                    <ns2:Length Units="inches">6.00</ns2:Length> 
                    <ns2:Width Units="inches">6.00</ns2:Width> 
                </ns2:ItemDimensions> 
                <ns2:Label>Mid-East</ns2:Label> 
                <ns2:ListPrice> 
                    <ns2:Amount>9.90</ns2:Amount> 
                    <ns2:CurrencyCode>USD</ns2:CurrencyCode> 
                </ns2:ListPrice> 
                <ns2:Manufacturer>Mid-East</ns2:Manufacturer> 
                <ns2:Model>BULB</ns2:Model> 
                <ns2:PackageDimensions> 
                    <ns2:Height Units="inches">3.70</ns2:Height> 
                    <ns2:Length Units="inches">8.10</ns2:Length> 
                    <ns2:Width Units="inches">4.00</ns2:Width> 
                    <ns2:Weight Units="pounds">0.35</ns2:Weight> 
                </ns2:PackageDimensions> 
                <ns2:PackageQuantity>1</ns2:PackageQuantity> 
                <ns2:PartNumber>BULB</ns2:PartNumber> 
                <ns2:ProductGroup>Single Detail Page Misc</ns2:ProductGroup> 
                <ns2:ProductTypeName>MUSICAL_INSTRUMENTS</ns2:ProductTypeName> 
                <ns2:Publisher>Mid-East</ns2:Publisher> 
                <ns2:SmallImage> 
                    <ns2:URL>http://ecx.images-amazon.com/images/I/31Fsu5jKWsL._SL75_.jpg</ns2:URL> 
                    <ns2:Height Units="pixels">75</ns2:Height> 
                    <ns2:Width Units="pixels">50</ns2:Width> 
                </ns2:SmallImage> 
                <ns2:Studio>Mid-East</ns2:Studio> 
                <ns2:Title>Spare Rubber Bulb</ns2:Title> 
            </ns2:ItemAttributes> 
        </AttributeSets> 
        <Relationships/> 
        <SalesRankings> 
            <SalesRank> 
                <ProductCategoryId>sdp_misc_display_on_website</ProductCategoryId> 
                <Rank>36468</Rank> 
            </SalesRank> 
        </SalesRankings> 
    </Product> 
</Products> 
</GetMatchingProductForIdResult> 
<ResponseMetadata> 
    <RequestId>afnapq823haeufabq2rhalhtz</RequestId> 
</ResponseMetadata> 
</GetMatchingProductForIdResponse> 

我将如何查找这两者以便可以注册它们以供 Xpath 使用？

最初，我认为以下方法会起作用，但事实并非如此:

$domDoc =  new DOMDocument(); 
 
$domDoc->loadXML($xml); 
 
$xpath = new DOMXPath($domDoc); 
 
$xpath->registerNamespace('ns', $domDoc->documentElement->lookupNamespaceURI(NULL)); 
$xpath->registerNamespace('n2', $domDoc->documentElement->lookupNamespaceURI('ns2')); 

寻找一种更简洁的方法来解决将路径的每一部分都包含在 local-name 中的需要。功能。

请您参考如下方法:

ns2 命名空间注册到 products 节点，因此您需要调用 products 节点的 lookupNamespaceURI 方法。这很丑陋，但可以解决问题:

$xpath->registerNamespace('ns', $domDoc->documentElement->lookupNamespaceURI(NULL)); 
$productNode = $xpath->query("/ns:GetMatchingProductForIdResponse/ns:GetMatchingProductForIdResult/ns:Products")->item(0); 
$xpath->registerNamespace('n2', $productNode->lookupNamespaceURI('ns2'));