16 Pa. Stat. § 5225
After receiving the certification of a zone plan from the zoning commission and before the enactment of any zoning ordinance, the county commissioners shall hold a public hearing thereon, of the time and place of which at least thirty days' notice shall be given by one publication in a newspaper of general circulation in the county. Such notice shall state the place at which the text and maps as certified by the zoning commission may be examined. The board may conduct consultative hearings or referenda to aid it in determining the desirability of contemplated or recommended regulations. No change in or departure from the text or maps as certified by the zoning commission shall be made unless such change or departure shall first be submitted to the zoning commission for its approval or disapproval or suggestions. The zoning commission shall have thirty days from and after such submission within which to send its report to the county commissioners. No approval, disapproval or suggestions of the zoning commission shall have more than advisory effect, or shall in anywise bind the county commissioners.
16 P.S. § 5225