curl获取xml数据的有关问题

function curlxml($url){
    $header[] = "Content-type: text/xml";//定义content-type为xml
    $ch = curl_init();  
    curl_setopt($ch, CURLOPT_URL, $url);  
    curl_setopt($ch, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
    curl_setopt($ch, CURLOPT_BINARYTRANSFER, true) ; // 在启用 CURLOPT_RETURNTRANSFER 时候将获取数据返回    
    $r = curl_exec($ch);  
    curl_close($ch); 
         
    return $r;    
    }
     
 $url="https://www.123456.com";
  
 $value=curlxml($url);
 
header('content-type:text/xml;charset=utf-8');
 echo $value;