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This is for users who are looking for a way to merge HTML form data with a PDF Form, then output the PDF Form with data populated in it, to a web browser.

This is a pure PHP solution which does NOT require the FDF toolkit. Contributed by www.TUFaT.com

<?php

// the full http path to the PDF form
$form = 'http://my_domain.com/my_pdf_form.pdf';

function create_fdf ($pdffile, $strings, $keys)
{
   $fdf = "%FDF-1.2n%â??â??Å?â?n";
   $fdf .= "1 0 obj n<< /FDF << /Fields [n";

   foreach ($strings as $key => $value)
   {
       $key = addcslashes($key, "nrt\()");
       $value = addcslashes($value, "nrt\()");
       $fdf .= "<< /T ($key) /V ($value) >> n";
   }
   foreach ($keys as $key => $value)
   {
       $key = addcslashes($key, "nrt\()");
       $fdf .= "<< /T ($key) /V /$value >> n";
   }

   $fdf .= "]n/F ($pdffile) >>";
   $fdf .= ">>nendobjntrailern<<n";
   $fdf .= "/Root 1 0 R nn>>n";
   $fdf .= "%%EOF";

   return $fdf;
}

// Fill in text fields
$strings = array(
   'date' => '10/17/2004',
   'full_name' => 'Joe Doe',
   'phone_num' => '123-4567',
   'company' => 'ACME Widgets',
   'amount' => 'USD 100.00'
   );

// Fill in check boxes/radio buttons
$keys = array('
   gender' => 'male',//radio button
   'is_adult' => 'Off',//checkbox
   'urgent' => 'On'//checkbox
   );

// Output the PDF form, with form data filled-in
header('Content-type: application/vnd.fdf');
echo create_fdf($form, $strings, $keys);

?>