Description
array 
fdf_get_attachment ( resource fdf_document, string fieldname, string savepath )
   Extracts a file uploaded by means of the "file selection" field
   fieldname and stores it under 
   savepath. savepath may be  
   the name of a plain file or an existing directory in which the file is to be created
   under its original name. Any existing file under the same name will be overwritten. 
  
Note: 
    There seems to be no other way to find out the original filename but to store
    the file using a directory as savepath and check
    for the basename it was stored under.
   
   The returned array contains the following fields:
   
- path - path were the file got stored - size - size of the stored file in bytes - type - mimetype if given in the FDF 
   
| Example 1. Storing an uploaded file | 
<?php $fdf = fdf_open_string($HTTP_FDF_DATA);
 $data = fdf_get_attachment($fdf, "filename", "/tmpdir");
 echo "The uploaded file is stored in $data[path]";
 ?>
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