chat_end_portal

local box = peripheral.find("chatBox") -- Finds a connected Chat Box
local detector = peripheral.wrap("right") --Defines the Detector on the right
if box == nil then error("Missing Chat Box") end
if detector == nil then error("Missing Player Detector on right") end

function tablelength(T)
  count = 0
  for _ in pairs(T) do count = count + 1 end
  return count
end

function sayPlayers(range)
  players = detector.getPlayersInRange(range)
  nPlayers = tablelength(players)
  for k,v in pairs(players) do
    box.sendMessageToPlayer(v..", welcome to Campicus' End Portal, Mob spawner and Zoo!", v)
  end
end

while true do
    sayPlayers(5)
    for x = 1,120 do
        sleep(1)
        players = detector.getPlayersInRange(5)
        if tablelength(players) > nPlayers then
            sayPlayers(5)
        end
    end
end