[member]

This is just a total guess. Don't know if it will work but give it a try. :P

pawn Код:

public OnPlayerCommandText(playerid, cmdtext[])
{
    new name[MAX_PLAYERS];
    GetPlayerName(playerid,name,sizeof(name));
    format(string,sizeof(string),"-> World Chat(%s): %s", name, cmdtext);
    SendMessageToMyWorld(0xFFFF00AA, string) return true;
    return false;
}

pawn Код:

SendMessageToMyWorld(color, text[])
{

    new world;
    world = GetPlayerVirtualWorld(playerid);
  for (new i; i < MAX_PLAYERS; i++)
  {
    if (world == GetPlayerVirtualWorld(i))
    {
            SendClientMessage(i, color, text);
    }
  }
}

Let me know.