XML $item->lastChild returns DOMText type

Hey Guys,

I'm pulling my hair out trying to figure out why this isn't work. I have to xml files. Both of them are written exactly the same way except for the values of course.

keys.xml

<?xml version="1.0" encoding="utf-8"?>
<keys>
	<key id="1">
		<id>1</id>
		<k_value>_Test1</k_value>
	</key>
	<key id="2">
		<id>2</id>
		<k_value>_Test2</k_value>
	</key>
	<key id="45">
		<k_id>45</k_id>
		<k_value>_MonkeyTest</k_value>
	</key>
</keys>

Code (markup):

values.xml

<?xml version="1.0" encoding="utf-8" ?>

<values>
	<value id="1">
		<id>1</id>
		<k_id>23</k_id>
	</value>
	<value id="2">
		<id>2</id>
		<k_id>35</k_id>
	</value>
</values>

Code (markup):

I am using this code to retrieve the lastChild and get the last id and then insert a new element. I do have another function with the similar code that gets the elements with the different names.

$array = array();
$doc = new DOMDocument();
$doc->formatOutput = true;
$doc->load("{$this->paths->avs_web}xml/keys.xml");
$keys = $doc->getElementsByTagName("keys");

foreach ($keys as $item) {
	$lastelement = $item->lastChild;
	$lastid = (int)$lastelement->getAttribute("id");
	$newid = $lastid + 1;
	
	$newElement = $doc->createElement("key");
	$newElement->setAttribute("id", $newid);
	$newElement1 = $doc->createElement("k_id", $newid);
	$newElement2 = $doc->createElement("k_value", $l);

	$newElement->appendChild($newElement1);
	$newElement->appendChild($newElement2);
	$item->appendChild($newElement);
}

$doc->save("{$this->paths->avs_web}xml/keys.xml");

return $newid;

Code (markup):

When I read keys.xml lastChild returns DOMElement. But when I read values.xml the lastChild is DOMText.

$lastelement = $item->lastChild;

Code (markup):

The DOMText value is "\n". I'm not sure why that would be because both the files are written exactly the same way.

I did remove all the files from values.xml and that made it work, the lastChild was a DOMElement but after file gets saved with the new node then it reverts back to the same problem.