(3.0.6 - 3.0.18 only, PHP 4 >= 4.0.0)
string fdf_next_field_name (int fdf_document [, string fieldname])
string fdf_next_field_name
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.
See also fdf_set_value(), fdf_get_value().