(PHP 4 >= 4.0.2, PHP 5)
ingres_field_name() returns the name of a field in a query result, or FALSE on failure.
index is the number of the field and must be between 1 and the value given by ingres_num_fields().
See also ingres_query(), ingres_fetch_array(), ingres_fetch_object() and ingres_fetch_row().
