SimpleXML：根据子元素的内容选择父节点

Question

这应该是个简单的任务，但我只是没有让它工作：在下面的代码片段中，我想 select <WebFilterCategory> 节点有一个 <Name> 子节点，其值为 "Categoryname2":

<?php
$xmlstring = <<<XML
<?xml version="1.0" encoding="UTF-8"?>
<Request>
  <Login>
    <UserName>admin</UserName>
    <Password>admin</Password>
  </Login>
  <Set Operation="get">
    <WebFilterCategory transactionid="">
      <Name>Categoryname1</Name>
      <Classification>Objectionable</Classification>
      <DomainList>
        <Domain>example1.com</Domain>
        <Domain>example2.com</Domain>
      </DomainList>
    </WebFilterCategory>
    <WebFilterCategory transactionid="">
        <Name>Categoryname2</Name>
        <Classification>Objectionable</Classification>
        <DomainList>
            <Domain>example1.org</Domain>
            <Domain>example2.org</Domain>
        </DomainList>
    </WebFilterCategory>
  </Set>
</Request>
XML;

$xml = simplexml_load_string( $xmlstring ) or die("Error: Cannot create object");
foreach ($xml->query('//WebFilterCategory/Name[contains(., "Categoryname2")]') as $category) {
    print_r($xmlstring);
}
?>

可能还有更精简的查询来获得所需的结果。

Answer 1

您要查找的方法不是query而是xpath

然后您可以更新路径以匹配名称包含 Categoryname2

的 WebFilterCategory

//WebFilterCategory[Name[contains(., "Categoryname2")]]'

更新代码

$xml = simplexml_load_string( $xmlstring ) or die("Error: Cannot create object");
foreach ($xml->xpath('//WebFilterCategory[Name[contains(., "Categoryname2")]]') as $category) {
    print_r($category);
}

输出

SimpleXMLElement Object
(
    [@attributes] => Array
        (
            [transactionid] => 
        )

    [Name] => Categoryname2
    [Classification] => Objectionable
    [DomainList] => SimpleXMLElement Object
        (
            [Domain] => Array
                (
                    [0] => example3.org
                    [1] => example2.org
                )

        )

)

看到一个Php demo

SimpleXML：根据子元素的内容选择父节点

SimpleXML: Selecting parent node based on content of child element

php

xml

xpath

simplexml