(PHP 4, PHP 5, PHP 7)
fdf_set_file — Set PDF document to display FDF data in
$fdf_document
   , string $url
   [, string $target_frame
  ] )Selects a different PDF document to display the form results in then the form it originated from.
fdf_documentThe FDF document handle, returned by fdf_create(), fdf_open() or fdf_open_string().
urlShould be given as an absolute URL.
target_frameUse this parameter to specify the frame in which the document will be displayed. You can also set the default value for this parameter using fdf_set_target_frame().
   Returns TRUE on success or FALSE on failure.
  
Example #1 Passing FDF data to a second form
<?php
  /* set content type for Adobe FDF */
  fdf_header();
  /* start new fdf */
  $fdf = fdf_create();
  /* set field "foo" to value "bar" */
  fdf_set_value($fdf, "foo", "bar");
  /* tell client to display FDF data using "fdf_form.pdf" */
  fdf_set_file($fdf, "http://www.example.com/fdf_form.pdf");
  /* output fdf */
  fdf_save($fdf);
  /* clean up */
  fdf_close($fdf);
?>