<?


function mergePDF_FDF($pdf_file, $dataarr)
{
	$fdf_file = tempnam("/tmp", "fdf_");
	$new_file = tempnam("/tmp", "new_pdf_");
	$path_parts = pathinfo($pdf_file);

	// get the FDF file contents
	$fdf = createFDF($path_parts[filename],$dataarr);
	
	// Create a file for later use
	if($fp = fopen($fdf_file, w))
	{
		fwrite($fp,$fdf,strlen($fdf));
		fclose($fp);
		
		exec("pdftk $pdf_file fill_form $fdf_file output $new_file");
	}
	else
		ddie('Unable to create fdf file.');
	
	return $new_file;
}



/*
*   createFDF
*
*   Takes values submitted via an HTML form and fills in the corresponding
*   fields into an FDF file for use with a PDF file with form fields.
*
*   @param  $file   The pdf file that this form is meant for. Can be either
*                   a url or a file path.
*   @param  $info   The submitted values in key/value pairs. (eg. $_POST)
*   @result Returns the FDF file contents for further processing.
*/
function createFDF($file,$info)
{
	$data="%FDF-1.2\n%忏嫌\n1 0 obj\n<< \n/FDF << /Fields [ ";
	foreach($info as $field => $val)
	{
		if(is_array($val))
		{
			$data.='<</T('.$field.')/V[';
			foreach($val as $opt)
				$data.='('.trim($opt).')';
			$data.=']>>';
		}else{
			$data.='<</T('.$field.')/V('.trim($val).')>>';
		}
	}
	$data.="] \n/F (".$file.") /ID [ <".md5(time()).">\n] >>".
		" \n>> \nendobj\ntrailer\n".
		"<<\n/Root 1 0 R \n\n>>\n%%EOF\n";
    return $data;
}