title: How to export a dynamically generated temporary csv file?
body: <p>I would like to generate a csv file with data, that I get by querying a database. The browser then should prompt the user to download the file. By problem is, that the readfile function needs a filename and not a handle, but I can't find a function to get the filename of this temporary file.
  I guess there are better ways to do this, but I can't find them.</p>
  
  <pre><code>$handle = tmpfile();
  fputcsv($handle, array('year', 'month', 'product', 'count'));
  header('Content-Type: application/csv');
  header('Content-Disposition:attachment;filename=LS_export');
  echo readfile($handle);
  fclose($handle);
  exit();
  </code></pre>