Question

I have the following xml file test.xml:

<a>
  <b c="test1" d="test2"/>
  <b c="test3" d="test4"/>
</a>

This xml file can have 1 or more b elements. I would like to ask how could I change the value of item c in a specific b using php.

Thanks in advance.

Answer 1

Using: http://php.net/manual/en/book.dom.php

Sample (all c-attributes):

<?php
$dom = new DomDocument;
$dom->load('sample.xml');

$xpath = new DomXPath($dom);

$cAttribs = $xpath->query('//*[@c]');
foreach ($cAttribs as $entry) {
    $entry->setAttribute('c', 'newValue');
}

header('Content-Type: text/xml; charset="UTF-8"');
echo $dom->saveXml();

Only specific nodes:

$dom = new DomDocument;
$dom->loadXml('<?xml version="1.0" encoding="UTF-8" ?>
<a>
  <b c="test1" d="test2" id="special-case" />
  <b c="test3" d="test4" />
</a>');

$xpath = new DomXPath($dom);

$cAttribs = $xpath->query('//*[@id="special-case"]');
foreach ($cAttribs as $entry) {
    $entry->setAttribute('c', 'newValue');
}

header('Content-Type: text/xml; charset="UTF-8"');
echo $dom->saveXml();