Ya, it seems to be the same as in France then: PhD students here have a real work contract and a student status (which comes as anywhere with many advantages). However we have mostly 3 years long PhDs, and the teaching hours are limited.

The law actually states the minimum salary for a PhD student. It is approximately 1650€ "brut" (before social taxes) which amounts to 1350€ "net" (what you actually get each month). If you have a "mission d'enseignement" (teaching hours), which is not mandatory, then you have to be teaching for 64 hours per years (that is not counting the time you spend preparing for the course or the time spent correcting students assignments of course) and should not occupy more than 1/6 of your working time. Your salary is then 2000€ "brut", which amounts 1650€ "net".

Public PhD funding almost always stays at this level of salary. However you can be paid more than this, for instance if you are paid on a project grant money or if you are in CIFRE (which means you are paid by a company for which you have to spend a defined part of your time, this is often but not always incompatible with having a "mission d'enseignement"). But then your a lot less free to do whatever you want (since the project or the company mst of the time have strongly fixed goals).