XML 上的 php xpath [英] php xpath on XML

问题描述

我怎样才能做到这一点:

How can I achieve this:

<root>
<gallery name="First">
 <picture active="1" detail="not shown"/>
 <picture active="1" detail="not shown"/>
 <picture active="0" detail="not shown"/>
</gallery>
<gallery name="Second">
 <picture active="0" detail="not shown"/>
 <picture active="1" detail="SHOW THIS ONE"/>
 <picture active="1" detail="AND SHOW THIS ONE" />
</gallery>
</root>

我正在尝试:

$myArray = $objXML->xpath('gallery[@name="Second"]/picture[@active=1]');

如何更改它以获得所需的输出?谢谢，安迪

How can I change it to get the desired output? Thanks, Andy

推荐答案

您的 XPath 是错误的.要么使用

Your XPath is wrong. Either use

/root/gallery[@name="Second"]/picture[@active=1]

仅从根节点匹配此节点星座或

to match this node constellation from the root node only or

//gallery[@name="Second"]/picture[@active=1]

匹配文档中任意位置的节点星座(较慢)

to match this node constellation anywhere in the document (slower)

完整的工作示例:

$dom = new DOMDocument;
$dom->load('NewFile.xml'); // containing your XML
$xp = new DOMXPath($dom);
$pictures = $xp->query('/root/gallery[@name="Second"]/picture[@active=1]');
foreach ($pictures as $picture) {
    echo $dom->saveXml($picture), PHP_EOL;
}

给予

<picture active="1" detail="SHOW THIS ONE"/>
<picture active="1" detail="AND SHOW THIS ONE"/>

和

$sxe = new SimpleXMLElement('NewFile.xml', NULL, TRUE);
$pictures = $sxe->xpath('/root/gallery[@name="Second"]/picture[@active=1]');
foreach ($pictures as $picture) {
    echo $picture['detail'], PHP_EOL;
}

给予

SHOW THIS ONE 
AND SHOW THIS ONE

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