Error creating xml document in simple xml

[michaelh613]

Here is my code

<?php
function createAuthenticateXML()
	{

$dom = new DOMDocument('1.0');
//create root element <Request_group> and append it to the document
$RESPONSE_GROUP = $dom->appendChild($dom->createElement('RESPONSE_GROUP'));
$RESPONSE_GROUP->setAttribute('MISMOVersionID','2.1');

$RESPONSE=$RESPONSE_GROUP->appendChild($dom->createElement('RESPONSE'));
$KEY=$RESPONSE->appendChild($dom->createElement('KEY_Name'));
$KEY->setAttribute('_Name','MemberID');
$KEY->setAttribute('_Value','123123123');

$RESPONSE_DATA=$RESPONSE->appendChild($dom->createElement('RESPONSE_DATA'));

$CREDIT_RESPONSE=$RESPONSE_DATA->appendChild($dom->createElement('CREDIT_RESPONSE'));
$CREDIT_RESPONSE->setAttribute('CreditReportType','Status');

$STATUS=$RESPONSE->appendChild($dom->createElement('STATUS'));
$STATUS->setAttribute('_Condition','Success');
$STATUS->setAttribute('_Name','PresentConsumerValidity');

$dom -> formatOutput = true;
$result= $dom->saveXML();
return $result;
}

$xml = createAuthenticateXML();
echo $xml->asXML(); 
echo $xml;	
?>

I am receiving an error message
Fatal error: Call to a member function asXML() on a non-object in C:\Inetpub\Sites\test\createauthenticatexml.php on line 26

I have echo'd my results without using asXML and received the following output in view source

<?xml version="1.0"?>
<RESPONSE_GROUP MISMOVersionID="2.1">
<RESPONSE>
<KEY_Name MemberID="123123123"/>
<RESPONSE_DATA>
<CREDIT_RESPONSE CreditReportType="Status"/>
</RESPONSE_DATA>
<STATUS Condition="Success" Name="PresentConsumerValidity"/>
</RESPONSE>
</RESPONSE_GROUP>

which appears to be a well formed xml

[Weedpacket]

Well, your createAuthenticateXML() function is constructing an XML object (using DOM, incidentally, not SimpleXML), and returning a string representation of the document. Which is why when you echo it out it looks like well-formed XML and not a PHP object of any sort. You put that string into $xml.

And then on the very next line you've forgotten all this and tried to treat the string as a SimpleXML object which you ask for a string representation of itself.