[Luis-]

format the string inside the loop then show the dialog outside the loop, like this;

pawn Код:

CMD:admins(playerid, params[])
{
    foreach(Player, i)
    {
        new string[256], name[MAX_PLAYER_NAME];
        GetPlayerName(i, name, sizeof(name));

        if(pInfo[i][Adminlevel ] > 0)
        {
            format(string, sizeof(string), "%s%s %s\n", string, AdminLevelName(playerid), name);
        }
    }
    ShowPlayerDialog(playerid, DIALOG_ONLINE_ADMINS, DIALOG_STYLE_MSGBOX, "Admins online", string, "Close", "");
    return 1;
}