Reading and Saving XML files with PHP DOMDocument

myxml.xml

<?xml version="1.0" encoding="utf-8"?>
<root>
	<color type="white"/>
</root>

xml.php

<?php 

$doc = new DOMDocument(); 
$doc->load("myxml.xml"); 
$root = $doc->firstChild;
$colors= $root->getElementsByTagName("color");
foreach($colors as $color){
	print_r($color->getAttribute("type"));
}

$new_color = $doc->createElement('color');
$new_color->setAttribute("type","blue");
$root->insertBefore($new_color,$root->firstChild);

$doc->save("myxml.xml");

?>