This hook is called when a CSV batch export file is about to be generated.
Notice that this hook will be called in per batch bases, e.g. if 3 batches are going to be exported in the same CSV then this hook will be called three times regarding each batch.
$results- the query result for the current batch that is being processed
$items- the entries of financial items that will actually become the records on the CSV (still per batch based)
- This hook can be used together with
hook_civicrm_batchQueryto add/modify the information in CSV batch exports
- You can loop through the two parameters to modify per financial item. This can even be used to filter financial items.