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function init_array(length,mode)
	local array={}
	for i=1,length do
		array[i]=mode end
	return array
end
function table.copy(t, lookup_table)
	if (t == nil) then return nil end
	local copy = {}
	setmetatable(copy, getmetatable(t))
	for i,v in pairs(t) do
		if type(v) ~= "table" then
			copy[i] = v
		else
			lookup_table = lookup_table or {}
			lookup_table[t] = copy
			if lookup_table[v] then
				copy[i] = lookup_table[v]
			else
				copy[i] = table.copy(v, lookup_table)
			end
		end
	end
	return copy
end
_menu=menu
menu={}
menu.data={
	["@main_menu"]={
		title="Menu Principal";
		button={
			{name="Inventário",func="menu.inv_show(v_me)"};
			{name="Loja",target="@shop"};
		}
	};
	["@shop"]={
		title="Loja@b";
		button={
			{name="Menu Principal";caption="Voltar";target="@main_menu"};
		}
	};
	["@buy"]={
		title="Deseja comprar esse item?";
		button={
			{name="Loja";caption="Voltar";target="@shop"};
			{name="Comprar";func="menu.inv_buy(v_me,USER[v_me].sel)"};
			{name="Ver descrição",func="menu.inv_shopdesc(v_me,USER[v_me].sel)"};
		}
	};
	["@equip"]={
		title="Test";
		button={
			{name="Menu Principal",caption="Voltar",target="@main_menu"};
			{name="Usar",func="menu.inv_use(v_me,USER[v_me].sel)"};
			{name="Vender",func="menu.inv_sell(v_me,USER[v_me].sel)"};
			{name="Ver descrição",func="menu.inv_desc(v_me,USER[v_me].sel)"};
			{name="Jogar fora",func="menu.inv_remove(v_me,USER[v_me].sel)"};
		}
	};
}
menu.itemdata={
{name="Poção de HP [250]",price=120,desc="Esta poção recupera totalmente sua saude.",func="heal_p(v_me,250)"};
{name="Poção de HP [100]",price=50,desc="Esta poção recupera sua saude.",func="heal_p(v_me,100)"};
{name="Poção de HP [50]",price=30,desc="Esta poção recupera um pouco sua saude.",func="heal_p(v_me,50)"};
{name="Poção de HP [20]",price=10,desc="Esta poção recupera um pouquinho sua saude.",func="heal_p(v_me,20)"};
}
for index,value in ipairs(menu.itemdata) do menu.data["@shop"].button[index+1]={name=menu.itemdata[index].name;caption=menu.itemdata[index].price.." créditos";func="USER[v_me].sel=(v_slot-1)";target="@buy"} end
USERDATA={
	menu_page="";
	menu_name="";
	sel="";
	inv={};
}
USER=init_array(32,USERDATA)
USER_ITEMS=init_array(32,{})
function menu.get(name,page,button)
	local data={}
	if type(name) == "table" then
		data = name
	else
		data = menu.data[name]
	end
	
	local slot=7*(page-1)+button
	local item=data.button[slot]
	--print(item.name)
	return item,slot
end
function menu.show(uid,name,page)
	local menu_page = page or 1
	local menu_name = name
	local data = {}
	
	if type(name) == "table" then
		data = name
	else
		data = menu.data[name]
	end	
	if data then
		local title = data.title
		local content = data.title
		local button = data.button or {}
		local length = math.ceil(#button/ 7)
			
		if #button > 9 then
			if menu_page < 1 then
				menu_page = length
			elseif menu_page > length then
				menu_page = 1
			end
				
			for	i = 7 * menu_page - 6, 7 * menu_page do
				if button[i] then
					content = content ..','..button[i].name
					if button[i].caption then
						content = content.."|"..button[i].caption
					end	
				else
					content = content ..','
				end
			end
			
			if menu_page == length
			then content = content ..',(Proximo)'
			else content = content ..',>> Proximo >>|Pagina '..menu_page+1
			end
	
			if menu_page == 1
			then content = content ..',(Anterior)'
			else content = content ..',<< Anterior <<|Pagina '..menu_page-1
			end	
		else
			for slot,button in ipairs(button) do
				content = content..","..button.name
				if button.caption then
					content = content.."|"..button.caption
				end
			end
		end
	
		USER[uid].menu_name = menu_name
		USER[uid].menu_page = menu_page
		_menu(uid,content)
	end
end
addhook("menu","menu.hook")
function menu.hook(uid,title,button)
	if button==0 then return end
	
	local menu_name = USER[uid].menu_name
	local menu_page = USER[uid].menu_page
	local menu_button = 0
	
	if type(menu_name) == "table" then
		menu_button = #menu_name.button
	else
		menu_button = #menu.data[menu_name].button
	end
	
	if menu_button > 9 then
		if button==9 then menu.show(uid,menu_name,menu_page-1) return end
		if button==8 then menu.show(uid,menu_name,menu_page+1) return end
	end
	
	local item,slot=menu.get(menu_name,menu_page,button)
	v_me=uid
	v_slot=slot
		
	if item.func then loadstring(item.func)() end
	if item.target then
		menu.show(uid,item.target)
	end	
end
addhook("serveraction","menu.input")
function menu.input(uid,action)
	if action==3 then
		menu.show(uid,"@main_menu")
	end
end
function menu.inv_remove(uid,item_slot)
	local items=table.copy(USER_ITEMS[uid])
	for slot,item in ipairs(items) do
		if item_slot == slot then
			table.remove(items,slot)
			USER_ITEMS[uid]=items
			break
		end
	end
end
function menu.inv_buy(uid,item_id)
	local item=menu.itemdata[item_id]
	if player(uid,"money") >= item.price then
		msg2(uid,"Você adquiriu "..item.name.."!")
		menu.inv_add(uid,item_id)
		parse("setmoney "..uid.." "..(player(uid,"money")-item.price))
	else
		msg2(uid,"Você não tem dinheiro suficiente para comprar "..item.name..".")
	end
end
function menu.inv_shopdesc(uid,item_id)
	local item=menu.itemdata[item_id]
	msg2(uid,item.name..": "..item.desc)
end
function menu.inv_desc(uid,item_slot)
	local item_id=USER_ITEMS[uid][item_slot]
	local item=menu.itemdata[item_id]
	msg2(uid,item.name..": "..item.desc)
end
function menu.inv_use(uid,item_slot)
	local item_id=USER_ITEMS[uid][item_slot]
	loadstring(menu.itemdata[item_id].func)()
	menu.inv_remove(uid,item_slot)
end
function menu.inv_sell(uid,item_slot)
	local item_id=USER_ITEMS[uid][item_slot]
	local item=menu.itemdata[item_id]
	parse("setmoney "..uid.." "..(player(uid,"money")+math.floor(item.price/2)))
	
	msg2(uid,item.name.." vendido por "..item.price.." de cash.")
	menu.inv_remove(uid,item_slot)
end
function menu.inv_add(uid,item_id)
	local item_id=item_id or 1
	local items=table.copy(USER_ITEMS[uid])
	
	table.insert(items,item_id)
		
	if #USER_ITEMS[uid] <= 14 then
		USER_ITEMS[uid] = items
	else
		msg2(uid,"Desculpe, o seu inventório está cheio.")
	end
end
function menu.inv_show(uid)
	local data=USER_ITEMS[uid]
	local newdata={title="Inventório";button={{name="Menu Principal",caption="Voltar",target="@main_menu"}}}
	for slot,item_id in pairs(data) do
		newdata.button[slot+1] = {name=(menu.itemdata[item_id].name),func="USER[v_me].sel=(v_slot-1)",target="@equip"}
	end
	menu.show(uid,newdata)
end
function menu.inv_addname(uid,_name)
	for item_id,data in ipairs(menu.itemdata) do
		if menu.itemdata[item_id].name:lower()==_name:lower() then
			menu.inv_add(uid,item_id)
			return
		end	
	end	
	return error("Erro, esse item não existe.")
end
function heal_p(uid,amount)
	parse("sethealth "..uid.." "..player(uid,"health")+amount)
	msg2(uid,"Você foi curado em "..amount.." pontos")
end
Spoiler 

See those lines:
This is where you are going to add information about itens.
price
The price of the item (enough said)
name
The name of the item (enough said too)
desc
The description of the item (too obvious)
func
The function that will be executed when you use that item. "v_me" is the global variable that represents your own ID. Inside the "", you write as if you were doing lua scripts normally. It is called string.load, you can check this function in the beginning of the script.
And some functions about items:
menu.inv_add(id,item_id)
Add an item to player by Item ID
menu.inv_addname(id,name)
Add an item to player by name
menu.inv_buy(id,item_id)
Buy an item to player by Item ID
menu.inv_remove(id,item_id)
Remove an item from player by Item ID
menu.inv_shopdesc(id,item_id)
Show a description of Item ID to player.
menu.inv_desc(id,item_slot)
Show a description of the slot inventory of the player.
menu.inv_use(id,item_slot)
Use an item from slot inventory of the player.
menu.inv_sell(id,item_slot)
Sells an item from slot inventory of the player for the half price it was bought.
menu.inv_show(id)
Show the player's inventory.
There is a very advanced menu function in the script too, if you guys want me to explain that, dont PM me. Just ask it here.
And I'm sorry if the script is in portuguese, I don't have interest in translating it.
Quote
menu.itemdata={
{
name="Poção de HP [250]",
price=120,
desc="Esta poção recupera totalmente sua saude.",
func="heal_p(v_me,250)"
};
{
name="Poção de HP [100]",
price=50,
desc="Esta poção recupera sua saude.",
func="heal_p(v_me,100)"
};
{
name="Poção de HP [50]",
price=30,
desc="Esta poção recupera um pouco sua saude.",
func="heal_p(v_me,50)"
};
{
name="Poção de HP [20]",
price=10,
desc="Esta poção recupera um pouquinho sua saude.",
func="heal_p(v_me,20)"
};
}
{
name="Poção de HP [250]",
price=120,
desc="Esta poção recupera totalmente sua saude.",
func="heal_p(v_me,250)"
};
{
name="Poção de HP [100]",
price=50,
desc="Esta poção recupera sua saude.",
func="heal_p(v_me,100)"
};
{
name="Poção de HP [50]",
price=30,
desc="Esta poção recupera um pouco sua saude.",
func="heal_p(v_me,50)"
};
{
name="Poção de HP [20]",
price=10,
desc="Esta poção recupera um pouquinho sua saude.",
func="heal_p(v_me,20)"
};
}
This is where you are going to add information about itens.
price
The price of the item (enough said)
name
The name of the item (enough said too)
desc
The description of the item (too obvious)
func
The function that will be executed when you use that item. "v_me" is the global variable that represents your own ID. Inside the "", you write as if you were doing lua scripts normally. It is called string.load, you can check this function in the beginning of the script.
And some functions about items:
menu.inv_add(id,item_id)
Add an item to player by Item ID
menu.inv_addname(id,name)
Add an item to player by name
menu.inv_buy(id,item_id)
Buy an item to player by Item ID
menu.inv_remove(id,item_id)
Remove an item from player by Item ID
menu.inv_shopdesc(id,item_id)
Show a description of Item ID to player.
menu.inv_desc(id,item_slot)
Show a description of the slot inventory of the player.
menu.inv_use(id,item_slot)
Use an item from slot inventory of the player.
menu.inv_sell(id,item_slot)
Sells an item from slot inventory of the player for the half price it was bought.
menu.inv_show(id)
Show the player's inventory.
There is a very advanced menu function in the script too, if you guys want me to explain that, dont PM me. Just ask it here.
And I'm sorry if the script is in portuguese, I don't have interest in translating it.
Approved by GeoB99
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Inventory system
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1 
Agustindz23: As I said, i don't have interest in translating strings. That simply doesn't matter. You can perfectly understand the core functions without it.