Add child to xml with PHP simpleXml - php

Question

i have problem with simpleXml and adding new items. This is my xml:
<?xml version="1.0" encoding="utf-8"?>
<root>
<items>
<item>abc</item>
<item>def</item>
<item>ghi</item>
</items>
</root>
Im using this php code:
$xml = simplexml_load_file("myxml.xml");
$sxe = new SimpleXMLElement($xml->asXML());
$newItem = $sxe->addChild("items");
$newItem->addChild("item", $newValue);
$sxe->asXML("myxml.xml");
This is the result:
<?xml version="1.0" encoding="utf-8"?>
<root>
<items>
<item>abc</item>
<item>def</item>
<item>ghi</item>
</items>
<items>
<item>jkl</item>
</items>
</root>
This creates me new items node, but i want add item to the same already existing items node.

Answer 1

then, you should not create new items node:
$xml = simplexml_load_file("myxml.xml");
$sxe = new SimpleXMLElement($xml->asXML());
$itemsNode = $sxe->items[0];
$itemsNode->addChild("item", $newValue);
$sxe->asXML("myxml.xml");

Answer 2

Have you tried doing the following way
$newItem->root->items[0]->addChild("item","Test");
Or
$newItem->root->items->addChild("item","Test");

Answer 3

You can use this class to SimpleXML objects that accept children append
<?php
class MySimpleXMLElement extends SimpleXMLElement
{
/**
* Add SimpleXMLElement code into a SimpleXMLElement
*
* #param MySimpleXMLElement $append
*/
public function appendXML($append)
{
if ($append) {
if (strlen(trim((string)$append)) == 0) {
$xml = $this->addChild($append->getName());
} else {
$xml = $this->addChild($append->getName(), (string)$append);
}
foreach ($append->children() as $child) {
$xml->appendXML($child);
}
foreach ($append->attributes() as $n => $v) {
$xml->addAttribute($n, $v);
}
}
}
}