我想将新节点插入特定节点,但我不知道该怎么做
number.xml
<numbers>
<number>1</number>
<number>2</number>
<number>3</number>
<number>4</number>
<number>5</number>
</numbers>
number.php
<?php
$xml = new DOMDocument();
$xml->formatOutput=true;
$xml -> load('number.xml');
$xml_subnumber = $xml->createElement("subNumber");
$xml_subnumber_text = $xml->createTextNode("3.3");
$xml_subnumber->appendChild($xml_subnumber_text);
//something here (I have no idea.)
$xml->save("number.xml") or die("Error");
?>
我希望xml文件看起来像这样......
<numbers>
<number>1</number>
<number>2</number>
<number>3
<subNumber>3.3</subNumber>
</number>
<number>4</number>
<number>5</number>
</numbers>
答案 0 :(得分:1)
您需要找到number
元素节点并将新节点附加到该节点。这是XPath。
/numbers/number[3]
将返回第三个number
元素节点。它将在列表中返回它,因为表达式可能返回多个节点或没有节点。这样结果类型始终保持不变。
$xml = new DOMDocument();
$xml->formatOutput = true;
$xml->preserveWhiteSpace = false;
$xml->loadXml(
'<numbers>
<number>1</number>
<number>2</number>
<number>3</number>
<number>4</number>
<number>5</number>
</numbers>'
);
$xpath = new DOMXpath($xml);
foreach ($xpath->evaluate('/numbers/number[3]') as $thirdNumber) {
$subNumber = $thirdNumber->appendChild(
$xml->createElement("subNumber")
);
$subNumber->appendChild($xml->createTextNode("3.3"));
}
echo $xml->saveXml();
输出:
<?xml version="1.0"?>
<numbers>
<number>1</number>
<number>2</number>
<number>3<subNumber>3.3</subNumber></number>
<number>4</number>
<number>5</number>
</numbers>