Save an email attachment using Zend Mail

To do some automated billing I needed to grab an email attachment off the exchange server. The Zend framework made it very easy to connect to the mail server and navigate files, and that part of the code came directly from the Zend Framework documentation. The issue that took the longest was saving the attachment. I could not figure out how to decode the attachment using the Zend framework. Let me know if you have a better way or if it helps you out.
NOTE: If you getting the mail from the INBOX you do not have to use the getFolders() function.

// Connecting with Imap
$mail = new Zend_Mail_Storage_Imap(
        array('host'     => 'SERVER',
              'user'     => 'USERNAME',
              'password' => 'PASSWORD'));

// Navigate to desired folder
$folder = $mail->getFolders()->INBOX->Info;

// Change to folder
$mail->selectFolder($folder);

// Loop through messages
foreach ($mail as $message)
{
 // Find desired message subject
 if($message->subject == 'SUBJECT')
 {
 // Check for attachment
 if($message->isMultipart())
 {
    $part = $message->getPart(2);
 }

 // Get the attacment file name
 $fileName = $part->getHeader('content-description');

 // Get the attachement and decode
 $attachment = base64_decode($part->getContent());

 // Save the attachment
 $fh = fopen($fileName, 'w');

 fwrite($fh, $attachment);

 fclose($fh);
 }
}

Getting the root node from an XML string

PHPs SimpleXML is great for parsing xml files. The downside is that it does not return the root node name. I wrote this function that gets the name.

/**
 * function getXMLRootNode
 * @param string An xml string
 * @return string Return XML root node name
 */

function getXMLRootNode($xmlstr)
{
 // Create DOM model
 $doc = new DOMDocument();

 // Load the XML string
 if(!$doc->loadXML($xmlstr))
 {
 throw new Exception('Unable to parse XML string');
 }

 // Find the root tag name
 $root = $doc->documentElement;

 if(!isset($root))
 {
 throw new Exception('Unable to find XML root node');
 }

 if(!isset($root->nodeName))
 {
 throw new Exception('Unable to find XML root node name');
 }

 return $root->nodeName;
}