[英]DOMXPath - Get Node
I'm facing an issue that I cannot resolve. 我面临一个无法解决的问题。 I'm using DOMXPath to retrieve the value of MsgId
tag of the following XML file : 我正在使用DOMXPath来检索以下XML文件的MsgId
标记的值:
<?xml version="1.0" encoding="UTF-8"?>
<Document xmlns="urn:iso:std:iso:20022:tech:xsd:pain.001.001.03" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<CstmrCdtTrfInitn>
<GrpHdr>
<MsgId>Test/20171013/CCT100621</MsgId>
<CreDtTm>2017-10-13T10:06:21</CreDtTm>
<NbOfTxs>62</NbOfTxs>
</GrpHdr>
</CstmrCdtTrfInitn>
</Document>
The following is my PHP code snippet to query the XML with DOMXPath: 以下是我用DOMXPath查询XML的PHP代码段:
$xml = <<<XML
<?xml version="1.0" encoding="UTF-8"?>
<Document xmlns="urn:iso:std:iso:20022:tech:xsd:pain.001.001.03" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<CstmrCdtTrfInitn>
<GrpHdr>
<MsgId>Test/20171013/CCT100621</MsgId>
<CreDtTm>2017-10-13T10:06:21</CreDtTm>
<NbOfTxs>62</NbOfTxs>
</GrpHdr>
</CstmrCdtTrfInitn>
</Document>
XML;
$document = new DOMDocument;
$document->loadXML($xml);
$groupHeaderXPath = new DOMXPath($document);
echo $groupHeaderXPath->query('//GrpHdr/MsgId')->length; // returns 0
I'm testing the query with this tool and it seems that it is correct. 我正在使用此工具测试查询,看来它是正确的。
Has anybody an idea, why the xpath expression does not work in this context? 有谁知道为什么xpath表达式在这种情况下不起作用? Am I missing some details here? 我在这里错过了一些细节吗?
$groupHeaderXPath
is of type DOMXPath , which has a method registerNamespace . $groupHeaderXPath
是类型的DOMXPath ,其具有方法registerNamespace 。
I think it would help to register the namespace and use the prefix 'urn' in your xpath expression. 我认为这将有助于注册名称空间并在xpath表达式中使用前缀“ urn”。
For example: 例如:
$rootNamespace = $document->lookupNamespaceUri($document->namespaceURI);
$groupHeaderXPath->registerNamespace("urn", $rootNamespace);
echo $groupHeaderXPath->query('//urn:GrpHdr/urn:MsgId')->length; // returns 1
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