PHP XML Receive

<?xml version="1.0" encoding="UTF-8"?>
<inventory>
   <book>
      <author>Nick Chase</author>
      <title>XML Primer Plus</title>
      <publisher>Sams</publisher>
   </book>
   <book>
      <author>Earth</author>
      <title>David Brin</title>
      <publisher>Spectra</publisher>
   </book>
   <movie>
      <director>Steven Spielberg</director>
      <title>Raiders of the Lost Ark</title>
      <actor>Harrison Ford</actor>
      <actor>Karen Allen</actor>
   </movie>
   <movie>
      <director>Rob Reiner</director>
      <title>The American President</title>
      <actor>Michael Douglas</actor>
      <actor>Annette Bening</actor>
      <actor>Martin Sheen</actor>
   </movie>
</inventory>

if (!isset($HTTP_RAW_POST_DATA))
   $HTTP_RAW_POST_DATA = file_get_contents("php://input");

   header("Content-type: text/plain");
   echo $HTTP_RAW_POST_DATA;
?>

if (!isset($HTTP_RAW_POST_DATA))
   $HTTP_RAW_POST_DATA = file_get_contents("php://input");

   $doc = new DOMDocument();
   $doc->loadXML($HTTP_RAW_POST_DATA);

   $allBooks = $doc->getElementsByTagName('book');
   $numBooks = $allBooks->length;

   $allMovies = $doc->getElementsByTagName('movie');
   $numMovies = $allMovies->length;

   echo "There are ".$numBooks." books and ".$numMovies." movies.";
?>