How to add new node in specific node on xml by php dom

Question

I want to insert new node to specific node but I have no idea how to do it

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");
?>

and I want the xml file seem like this...

<numbers>
   <number>1</number>
   <number>2</number>
   <number>3
     <subNumber>3.3</subNumber>
   </number>
   <number>4</number>
   <number>5</number>
</numbers>

ThW · Accepted Answer · 2014-11-20 13:57:13Z

You need to find the number element node and append the new node to it. Here is XPath for that. /numbers/number[3] will return the third number element node. It will return it in a list, because expressions could return several nodes or no nodes. This way the result type always stays the same.

$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();

Output:

<?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>

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