(PHP 4 >= 4.3.0, PHP 5 < 5.3.0, PECL fdf SVN)
fdf_get_ap — Get the appearance of a field
   Gets the appearance of a field (i.e. the value of
   the /AP key) and stores it in a file. 
  
fdf_documentThe FDF document handle, returned by fdf_create(), fdf_open() or fdf_open_string().
field
face
       The possible values are FDFNormalAP, 
       FDFRolloverAP and FDFDownAP.
      
filenameThe appearance will be stored in this parameter.