XML : Echo PHP's XMLWriter to the page

I am trying to write some data that I fetch from a db to the page with xml formatting but I cant get it to work,there no error or something, it just doesnt print anything, thats my code

  if($_GET["action"]=="fetch"){          $sqlget = "select * from hotspot";            $result = $conn->query($sqlget);            $writer = new XMLWriter();            $writer->openMemory();            $writer->startDocument('1.0','UTF-8');            $writer->setIndent(4);             $writer->startElement('hotspots');          while ($row=$result->fetch_assoc()) {              $lat=$row["lat"];              $lng=$row["lng"];              if(distanceGeoPoints($lat,$lng,$_GET["lat"],$_GET["lng"])<$_GET["range"]){                  $writer->startElement('entry');                      $writer->writeAttribute('lat',$row["lat"]);                        $writer->writeAttribute('lng',$row["lng"]);                        $writer->writeAttribute('ssid',$row["ssid"]);                        $writer->writeAttribute('name',$row["name"]);                        $writer->writeAttribute('password',$row["password"]);                    $writer->endElement();                   echo $row["lat"].";".$row["lng"].";".$row["ssid"].";".$row["name"].";".$row["password"]; //->this gets echoed just fine              }          }          $writer->endElement();            $writer->endDocument();             echo  $writer->outputMemory(); //->this doesn't work          $writer->flush();      }