嵌套在数据中的Xml php属性

I am working with the following xml

<?xml version="1.0" encoding="UTF-8"?>
<ns2:worldmate-parsing-result xmlns:ns2="http://www.worldmate.com/schemas/worldmate-api-v1.xsd" request-id="100793160" received="2014-12-27T16:34:42.000Z">
    <status>SUCCESS</status>
    <error-msg>An itinerary confirmation e-mail was parsed successfully</error-msg>
    <headers>
        <header value="multipart/alternative;  boundary=&quot;Apple-Mail=_62E5BF7A-C482-4FE0-8F43-15613E46D5FD&quot;" name="Content-type" />
        <header value="&lt;xxxxx@me.com&gt;" name="Return-Path" />
        <header value="rule=notspam policy=default score=0 spamscore=0  suspectscore=3 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0  reason=mlx scancount=1 engine=7.0.1-1412080000 definitions=main-1412270180" name="X-Proofpoint-Spam-Details" />
    </headers>
    <end-user-emails>
        <user email="yyyyy@me.com" />
    </end-user-emails>
    ....
 </ns2:worldmate-parsing-result>

I am trying to access the following data within the xml:

xxxxx@me.com
yyyyy@me.com

I am trying to do access the second email address using the following code.

$endus='end-user-emails';
$endUserEmails=$xml->$endus->attributes()->{'user'};
echo $endUserEmails;

Not sure why but it is forcing me to use a variable name, and if I use dashes I get errors.

You could use the XML DOM Parser to query the XML:

$doc = new DOMDocument;
$doc->Load('file.xml');
$xpath = new DOMXPath($doc);
$entries = $xpath->query('//end-user-emails/user/@email');
foreach ($entries as $entry) {
    echo $entry->nodeValue; //Or do something else with the email value
}

Crucial is the query:

//end-user-emails/user/@email

Which means: "For every tag <user> under a tag <end-user-emails>, return the email attribute."

For the first email this can be replaced by:

//headers/header/@value

and then remove the < and &gt;

Example: (with php -a)

$ php -a Interactive mode enabled

php > $doc = new DOMDocument();
php > $xmldoc = '<?xml version="1.0" encoding="UTF-8"?>
php ' <ns2:worldmate-parsing-result xmlns:ns2="http://www.worldmate.com/schemas/worldmate-api-v1.xsd" request-id="100793160" received="2014-12-27T16:34:42.000Z">
php '     <status>SUCCESS</status>
php '     <error-msg>An itinerary confirmation e-mail was parsed successfully</error-msg>
php '     <headers>
php '         <header value="multipart/alternative;  boundary=&quot;Apple-Mail=_62E5BF7A-C482-4FE0-8F43-15613E46D5FD&quot;" name="Content-type" />
php '         <header value="&lt;xxxxx@me.com&gt;" name="Return-Path" />
php '         <header value="rule=notspam policy=default score=0 spamscore=0  suspectscore=3 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0  reason=mlx scancount=1 engine=7.0.1-1412080000 definitions=main-1412270180" name="X-Proofpoint-Spam-Details" />
php '     </headers>
php '     <end-user-emails>
php '         <user email="yyyyy@me.com" />
php '     </end-user-emails>
php '  </ns2:worldmate-parsing-result>';
php > $doc->loadXML($xmldoc);
php > $entries = $xpath->query('//end-user-emails/user/@email');
php > foreach ($entries as $entry) {
php { echo $entry->nodeValue."
";
php { }
yyyyy@me.com

Using simple xml (load string or file), you can access the emails with:

$a = 'end-user-emails';
$xml = simplexml_load_string($str);

echo ($xml->$a->user->attributes()->email);

You need to specify the tag the value is in, and then call the attribute's name