No member of the planning and zoning board, including a regular member, alternate member or ex-officio member, shall benefit directly or indirectly in any matter coming before the board nor shall any such member accept personal gifts or gratuity services given with the intention of influencing such member in his consideration, vote, action, favor or recommendation as to an official matter before the board. Any member of the board who has an interest, direct or indirect, in any matter before the board shall make his interest known to the full board and forthwith disqualify himself from consideration of the matter.