Well, you can look at the individual University's pages. Having courses in a PhD, or having something like a "PhD program" in general, is still very rare.
The common model is to take a job as an assistant researcher with the chair of your Professor, work on your PhD thesis and papers 50% of the time, and be treated like cheap slave labour by your professor the other 95% (sic!) of the time.
The common model is to take a job as an assistant researcher with the chair of your Professor, work on your PhD thesis and papers 50% of the time, and be treated like cheap slave labour by your professor the other 95% (sic!) of the time.