<?php
session_start();

$_SESSION['arrConfig'];


$docConfigXML = new DOMDocument;
$docConfigXML->preserveWhiteSpace = FALSE;
$docConfigXML->load( 'resources/xml/config.xml' );

$_SESSION['arrConfig']['fax'] = trim($docConfigXML->getElementsByTagName("fax")->item(0)->getAttribute('value'));
$_SESSION['arrConfig']['phone'] = trim($docConfigXML->getElementsByTagName("phone")->item(0)->nodeValue);

echo $_SESSION['arrConfig']['fax'];
echo "<br />";
echo $_SESSION['arrConfig']['phone'];

$strConfigXML = "";


$fax 	= "702-555-1faxxx";
$phone 	= '702-555-phone';

$strConfigXML = 
<<<END
<?xml version="1.0" encoding="utf-8"?>
<config>
	<fax value='$fax' />
	<phone>
	$phone
	</phone>
</config>
END;

$file = "resources/xml/config.xml";

writeFile($file,$strConfigXML);

function writeFile($file,$strFileContent)
{
	$fh = fopen($file, 'w' ) or die ("can't create file");
    fwrite($fh, $strFileContent);
    fclose($fh);
}
?>

This is a simple example of how to read and write XML that includes reading attributes and nodes.

write and read XML

xml

PHP