[[D]ry[D]esert]

pawn Код:

stock GetHighestKills() // it will return the id of highest kills
    {
        new id = -1;
        new id2;
        for(new i = 0;i < MAX_PLAYERS)
            {
                if(IsPlayerConnected(i))
                    {
                        id2 = PlayerInfo[playerid][pKill];
                            if(id2 > id && id != -1)
                                {
                                    id = i;
                                }
                    }
            }
        return id; //if the was was empty it will return to -1; which you can say its INVALID PLAYER ID
    }

Not tested..