Section 25. Increasing compensation during fiscal year prohibited

The board
  of estimate and apportionment of any city or the body exercising similar
  functions  in  any  city,  excepting  a city of the first class having a
  population of more than five hundred thousand and less than one million,
  is hereby prohibited from increasing the compensation of any  office  or
  position,  except  compensation  on  per  diem  basis,  paid  out of the
  treasury of such city, during any fiscal year, after the same shall have
  been fixed and provided for in the budget of such city for  such  fiscal
  year.