Gets the name of the field after the given field. This name can be used with several functions.
The FDF document handle, returned by fdf_create(), fdf_open() or fdf_open_string().
Name of the FDF field, as a string. If not given, the first field will be assumed.
Returns the field name as a string.
<?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"; }?>