I'm trying to parse the mobile.de API. I have this code to get the XML:
$titan = TitanFramework::getInstance( 'MWPC' );
$handle = curl_init();
$sellerID = $titan->getOption( 'mwpc_seller_id' ).' HTTP/1.0'; 
$auth_token = base64_encode($titan->getOption( 'mwpc_api_usr' ) . ':' . $titan->getOption( 'mwpc_api_pass' ));
    curl_setopt_array(
        $handle,
        array(
            CURLOPT_URL => 'http://services.mobile.de/1.0.0/ad/search?customerId='.$sellerID,
            CURLOPT_POST => false,
            CURLINFO_CONTENT_TYPE => 'application/xml',
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_HTTPHEADER => array(
                   'Authorization: Basic '. $auth_token,
                   'accept: application/xml',
                   'Accept-Language: de, en'
            )
        )
    );
$response = curl_exec($handle);
I get the following XML Response:
<search:result xmlns:resource="http://services.mobile.de/schema/resource" xmlns:seller="http://services.mobile.de/schema/seller" xmlns:ad="http://services.mobile.de/schema/ad" xmlns:search="http://services.mobile.de/schema/search" xmlns:financing="http://services.mobile.de/schema/common/financing-1.0" xmlns:error="http://services.mobile.de/schema/common/error-1.0" total="28" page-size="20" current-page="1" max-pages="2">
    <ad:ad key="123456" url="http://services.mobile.de/1.0.0/ad/...">
        <ad:creation-date value="2014-12-08T09:51:39+01:00"/>
        <ad:modification-date value="2015-01-09T12:56:16+01:00"/>
        <ad:detail-page url="http://suchen.mobile.de/auto-inserat/..."/>
        <ad:vehicle>
            <ad:class key="Car" url="http://services.mobile.de/1.0.0/refdata/classes/Car">
                <resource:local-description xml-lang="de">Pkw</resource:local-description>
            </ad:class>
            <ad:category key="Cabrio" url="http://services.mobile.de/1.0.0/refdata/categories/Cabrio">
                <resource:local-description xml-lang="de">Cabrio/Roadster</resource:local-description>
            </ad:category>
            <ad:make key="MINI" url="http://services.mobile.de/1.0.0/refdata/classes/Car/makes/MINI">
                <resource:local-description xml-lang="de">MINI</resource:local-description>
            </ad:make>
            <ad:model key="COOPER_SD_CABRIO" url="http://services.mobile.de/1.0.0/refdata/classes/Car/makes/MINI/models/COOPER_SD_CABRIO">
            <resource:local-description xml-lang="de">Cooper SD Cabrio</resource:local-description>
            </ad:model>
And the XML object handling:
$XML_Obj = simplexml_load_string($response);
echo '<pre>';
print_r($XML_Obj);
echo '</pre>';
The above code will output:
SimpleXMLElement Object
(
    [@attributes] => Array
        (
            [total] => 28
            [page-size] => 20
            [current-page] => 1
            [max-pages] => 2
        )
)
How can I echo the data from inside the "ad:foo"?
I stuck at this point!! Was googling for many hours :(
edit:
If I use this code from suggestion I get an empty array:
$att = $XML_Obj->xpath("//ad[@key='car']");