The mayor, recorder, aldermen and common councilmen, in common council assembled, shall have full power and authority to make, ordain, constitute and establish, such and so many laws, ordinances, regulations and constitutions, (provided the same shall not be repugnant to the laws and constitution of this commonwealth,) as shall be necessary or convenient for the government and welfare of the said city, and the same to enforce, put in use, and execution, by the proper officers, and at their pleasure to revoke, alter and make anew, as occasion may require.
53 P.S. § 16254