Getting nodes by attribute value in DomXML and PHP - php

Question

I am trying to select a specific node to edit its content and attributes later on, but I am not able to select a notice node (see the PHP code below).
XML document
<?xml version="1.0" encoding="UTF-8"?>
<notices lastID="0001">
<!--
<notice id="0000" endDate="31-12-2025">
Content of the notice.
</notice>
-->
<notice id="0001" endDate="13-01-2013" active="1">
One amazing notice.
</notice>
</notices>
The $id value is "0001" (string).
PHP
$document = new DOMDocument;
$document = dom_import_simplexml($this->xml);
$notices= $document->getElementsByTagName('notice');
#var_dump($notices);
foreach($notices as $element)
{
if($element->getAttribute('id') == $id)
{
$notice = $element;
var_dump($notice); //Returns absolutely nothing (I guess the if returns false).
}
}
$notice->removeAttribute("endDate");
$notice->setAttribute("endDate",$endDate);
Everytime I fall into the if statement, my $notice returns no value.
I tried with xpath query ( //notice[#id="{$id}"]) without any success.
To clarify, my problem would be $element->getAttribute('id') does not seem to work.
I also tried with SimpleXML:
PHP
$document = new DOMDocument;
$document = simplexml_import_dom($this->xml);
$notice = "";
foreach($document->notices->children() as $element)
{
$attributes = $element->attributes();
if($attributes['id'] == $id)
{
$notice= $element;
var_dump($notice);
}
}
$avis->removeAttribute("endDate");
$avis->setAttribute("endDate",$endDate);
SimpleXML gives me the following message: Node no longer exists on the following line:
foreach($document->notices->children() as $element)

Answer 1

I finally got it.
PHP
$document = simplexml_import_dom($this->xml);
$notice = "";
$xpathResults = $document->xpath('//notice');
foreach($xpathResults as $element)
{
$elementID = $element->id[0];
$domXML = dom_import_simplexml($element);
if((string) $noticeID == $id)
{
$notice = $domXML;
}
}