(PHP 3 >= 3.0.6, PHP 4, PHP 5)
fdf_next_field_name -- Get the next field name
Description
string 
fdf_next_field_name ( resource fdf_document [, string fieldname] )
   The fdf_next_field_name() function returns the
   name of the field after the field in
   fieldname or the field name of the first field
   if the second parameter is NULL.
  
   
Example 1. Detecting all fieldnames in a FDF 
<?php $fdf = fdf_open($HTTP_FDF_DATA); for ($field = fdf_next_field_name($fdf);      $field != "";      $field = fdf_next_field_name($fdf, $field)) {   echo "field: $field\n"; }  ?>
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   See also fdf_get_value().