No officer or employe of such city shall collect any fees or perquisites for his own use, but all such fees or perquisites, collectible under the law, shall be paid into the city treasury; and the council shall provide by ordinance for the payment of proper salaries or other compensation, to be fixed by council, to all officers and employes of the city, except for such of them whose salaries are fixed by law or who it is provided by law shall serve without compensation.
53 P.S. § 12197