(PHP 4 >= 4.3.0, PHP 5, PHP 7)
fdf_get_ap — Get the appearance of a field
$fdf_document
   , string $field
   , int $face
   , string $filename
   )
   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.
   Returns TRUE on success or FALSE on failure.