title: set page orientation using header
body: <p>Given a php file, I export its output to an .odt file (OpenOffice Writer) by means of the following lines:</p>
  
  <pre><code>header('Content-Type: application/vnd.oasis.opendocument.text');
  header('Content-Disposition: attachment; filename="myfile.odt"');
  </code></pre>
  
  <p>I can't figure out how to set the page orientation to <strong>landscape</strong>. By default, it is set to portrait.</p>
  
  <p>Any hints?</p>