minetest.register_on_joinplayer(function(player)

local uo = (io.open(minetest.get_worldpath().."/now_online/"..player:get_player_name()..".txt", "w"))
uo:write("1")
uo:close()

end)

minetest.register_on_leaveplayer(function(pl)

local cpn = 0

for _,play in ipairs(minetest.get_connected_players()) do
        cpn = cpn+1
end

os.remove(minetest.get_worldpath().."/now_online/"..pl:get_player_name()..".txt")

minetest.chat_send_all("[Server]: Player "..pl:get_player_name().." is leaving,  "..cpn.." online.")

end)