A city that has been granted power to zone beyond its corporate boundaries (T.C.A. § 13-3-102) cannot zone outside of its UGB, regardless of the five-mile limit.  However, if the county has no zoning and the city has not received extraterritorial zoning authority under the statute cited above, then the municipality may zone beyond its city limits only with the approval of the county legislative body.  This rule includes territory that is outside the city limits but inside the UGB.  The county retains authority to enact zoning (T.C.A. § 13-7-101 et seq.) within a PGA, an RA, and a UGB (although presumably only that Section of the UGB that is outside of municipal boundaries).  The new law does not expand a county's zoning authority or enact statewide zoning.