Fires whenever a control segment is read that marks the start of a functional group.
Object Oriented Interface
public function fireStartFunctionalGroup($param);
ipworksedi_vdareader_register_callback($res, 8, array($this, 'fireStartFunctionalGroup'));
The StartFunctionalGroup event will fire when a control segment marking the start of a functional group structure is read. The Tag parameter contains the tag of the segment, such as GS. ControlNumber contains the control number associated with the segment.