local function count_items()
        print("Loading all items, this may take some time...")
        local i = 0
        local number = 0
        for name, item in pairs(minetest.registered_items) do
                if (name and name ~= "") then
                        number = number + 1
                end
                i = i+1
        end
        print("There are "..number.." registered items.")
        minetest.chat_send_player("singleplayer", "There are "..number.." registered items.")
end

minetest.after(5, count_items)