由于服务器配置不规范等等原因都会导致此类错误，解决：

http://my.oschina.net/cart/

class SoapClientNew extends SoapClient  
{  
    public function __doRequest($request, $location, $action, $version, $one_way = 0)  
    {  
        $request = parent::__doRequest($request, $location, $action, $version, $one_way);  
        
        $start = strpos($request, ‘<soap‘);//根据实际情况做处理。。。，如果是<?xml开头，改成<?xml
        $end = strrpos($request, ‘>‘);  
        return substr($request, $start, $end-$start+1);  
    }  
}

$client = new SoapClientNew($url);