php - 使用 PHP 查找所有 XML 命名空间 URI

Question

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。

Answer 1

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'));