API: get visitor addition info

Hi all

For my web site i need specific functional:
Is it possible to get current visitor traffic source (google organic, adwords, email campaign, etc). In php api i’m not found it,
so I also not found it in piwik_log_visit.

Thx for help

Yes of course, see referer_* columns. Also see: http://piwik.org/docs/analytics-api/reference/#Referers