HTML Form to FDF Parser for PHP

xfdf.php

<?php
/*
KOIVI HTML Form to FDF Parser for PHP (C) 2004 Justin Koivisto
Version 1.2
Last Modified: 2011/12/02

    This library is free software; you can redistribute it and/or modify it
    under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation; either version 2.1 of the License, or (at
    your option) any later version.

    This library is distributed in the hope that it will be useful, but
    WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
    License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this library; if not, write to the Free Software Foundation,
    Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

    Full license agreement notice can be found in the LICENSE file contained
    within this distribution package.

    Justin Koivisto
    justin.koivisto@gmail.com
    http://koivi.com
*/

/**
 * createXFDF
 *
 * Tales values passed via associative array and generates XFDF file format
 * with that data for the pdf address sullpiled.
 *
 * @param string $file The pdf file - url or file path accepted
 * @param array $info data to use in key/value pairs no more than 2 dimensions
 * @param string $enc default UTF-8, match server output: default_charset in php.ini
 * @return string The XFDF data for acrobat reader to use in the pdf form file
 */
function createXFDF($file, $info, $enc='UTF-8'){
    $data = '<?xml version="1.0" encoding="'.$enc.'"?>'."\n" .
        '<xfdf xmlns="http://ns.adobe.com/xfdf/" xml:space="preserve">'."\n" .
            '<fields>'."\n";
    foreach($info as $field => $val){
        $data .= '<field name="'.$field.'">'."\n";
        if(is_array($val)){
            foreach($val as $opt){
                $data .= '<value>'.htmlentities($opt, ENT_COMPAT, $enc).'</value>'."\n";
            }
        }else{
            $data .= '<value>'.htmlentities($val, ENT_COMPAT, $enc).'</value>'."\n";
        }
        $data .= '</field>'."\n";
    }
    $data .= '</fields>'."\n".
            '<ids original="'.md5($file).'" modified="'.time().'" />'."\n".
            '<f href="'.$file.'" />'."\n".
        '</xfdf>'."\n";

    return $data;
}