Answer is: Depends.
Teachers may not necessarily be a problem, as photography basics can be picked up and taught quicker than Physics (heh heh). THe problem is: setting up a dark room using a classroom - your school may not have the resource, getting the equipment (if the students cannot afford the SLRs or cameras), getting the chemicals for those dark room, light-proofing dark rooms... Which country are you from anyway?
If you're from a 1st world country, most students are expected to buy their own photography equipment so the school only provides the darkroom and the chemicals for them to work with. The initial cost for the school then will not be very high at all (Dark room, chemicals, light-proofing cost, lighting). That's because film-based equipments tend to be cheap and very affordable (300 USD can have you going places in NZ, literally

), so that shouldn't be too hard. However, if you're not then you have to consider that the school may have to provide equipments, which may be vandalized etc...
If you're interested in photography, and if your school cannot start one learning from TPF shouldn't be too hard at all (We're nice folks after all

). Your local library/university should be able to offer a nice selection of books on basic photography which you can learn from.
Hope this helps.