How do I rename XML values using php? - php

Question

How do I rename a value in xml using PHP? This is what I've got so far:
<?php
$q = $_GET["q"];
$q = stripslashes($q);
$q = explode('|^', $q);
$old = $q[0];
$dom = new DOMDocument;
$dom->preserveWhiteSpace = false;
$dom->formatOutput = true;
$dom->Load("test.xml");
$xpath = new DOMXPath($dom);
$query1 = 'channel/item[title="' . $old . '"]/title';
$entries = $xpath->query($query1);
foreach ($entries as $entry)
{
$oldchapter = $entry->parentNode->removeChild($entry);
$item = $dom->getElementsByTagName('item');
foreach ($item as $items)
{
$title = $dom->createElement('title', $q[1]);
$items->appendChild($title);
}
}
$dom->save("test.xml");
Basically, what it does is take two titles from a url, the old existing title, and the one the user wants to change it to (so like this oldtitle|^newtitle), and puts them into an array.
What I've tried doing is removing the existing old title, and then making a new title with, using the new title value from the url, but it doesn't seem to be working. Where am I going wrong, or is there an easier way of doing this?

Answer 1

The way to do this is with DOMNode::replaceChild(). The majority of your code is correct, you've just slightly over-complicated some of the DOM stuff.
Try this:
<?php
$q = $_GET["q"];
$q = stripslashes($q);
$q = explode('|^', $q);
$old = $q[0];
$dom = new DOMDocument;
// Do this *before* loading the document
$dom->preserveWhiteSpace = false;
$dom->formatOutput = true;
$dom->Load("test.xml");
$xpath = new DOMXPath($dom);
$query1 = 'channel/item[title="' . $old . '"]/title';
$entries = $xpath->query($query1);
// This is all you need to do in the loop
foreach ($entries as $oldTitle) {
$newTitle = $dom->createElement('title', $q[1]);
$entry->parentNode->replaceChild($newTitle, $oldTitle);
}
$dom->save("test.xml");