[Kindred]

pawn Код:

CMD:world(playerid, params[])
{
    new id;
    if(sscanf(params, "i", id)) return SendClientMessage(playerid, -1, "Usage: /world [id]");
    if(id > 99 || id < 0) return SendClientMessage(playerid, -1, "Limit: 0-99);
    Worlds[playerid] = id;
    return 1;
}

Not quite sure what you wanted. Didn't know whether to make Worlds = id, or make it one. I just made it so that it sets the players Worlds variable to the id the put in.

EDIT: Looks like I was too late.