XML上的php xpath

Question

我怎樣才能做到這一點：

<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>

我正在努力：

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

如何更改它以獲得所需的輸出？ 謝謝，安迪

Answer 1

你的XPath錯了。 要么使用

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

僅從根節點匹配此節點星座或

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

在文檔中的任何位置匹配此節點星座（較慢）

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;
}

給

<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;
}

給

SHOW THIS ONE 
AND SHOW THIS ONE