problemi con simplexml_load_string

[overflow1993]

<?php 
function create_xml(){  
    $request='<HotelListRequest> 
    <city>Seattle</city> 
    <arrivalDate>12/12/2011</arrivalDate> 
    <departureDate>12/23/2011</departureDate> 
    <RoomGroup> 
      <Room> 
        <numberOfAdults>1</numberOfAdults> 
      </Room> 
    </RoomGroup> 
    </HotelListRequest>'; 
    return $request; 
} 
$a = create_xml(); 

$cid='55505'; 
$apikey='cbrzfta369qwyrm9t5b8y8kf';      
$user_ip=$_SERVER['REMOTE_ADDR'];       
$user=$_SERVER['HTTP_USER_AGENT'];                  
$url='http://api.ean.com/ean-services/rs/hotel/v3/list?'; 
$dati_post='cid=' . $cid . '&minorRev=9&apiKey=' . $apikey . '&locale=it_IT&currencyCode=EUR&customerSessionId=&xml=' . $a; 

?> 
[url="<?php echo $url; echo $dati_post; ?>"]link[/url]

 
<?php 
$curl = curl_init();       
curl_setopt($curl,CURLOPT_URL, $url);  
curl_setopt($curl,CURLOPT_POST, true); 
curl_setopt($curl,CURLOPT_POSTFIELDS, $dati_post);     
curl_setopt($curl,CURLOPT_HTTPHEADER,array('Content-type:application/x-www-form-urlencoded'));  
curl_setopt($curl,CURLOPT_RETURNTRANSFER,1);       
curl_setopt($curl,CURLOPT_TIMEOUT,200);             

$output = curl_exec($curl);       

curl_close($curl); 

//$xml = new SimpleXMLElement(file_get_contents($output), NULL, TRUE);
$xmlstr = file_get_contents($output);
$test=html_entity_decode($xmlstr);
$a = simplexml_load_string($test); 
//$sitemap = new SimpleXMLElement($xmlstr);

//print_r($a);  
//echo  $output; 
var_dump($a);  
foreach($a->HotelList->HotelSummary as $hotel){
    vardump($hotel);
}
/*$p = $a->customerSessionId;
var_dump($p);*/
?>

non stampa cio che mi aspetto ;(