Something

public OnVehicleDeath(vehicleid, killerid)
{
    new kname[256];
	new pname[256];
	new string[256];
	new playerid;

	GetPlayerName(killerid, kname, sizeof(kname));

	for(new i;i<=GetMaxPlayers();i++)
	{
	    if (IsPlayerConnected(i))
	    {
	        if (tank[i] == vehicleid)
	        {
	            GetPlayerName(i, pname, sizeof(pname));
	            playerid = i;
	            format(string, sizeof(string), "** (lvl:%d)%s has killed (lvl:%d)%s **", lvl[killerid], kname, lvl[playerid], pname);
				SendClientMessageToAll(COLOR_RED, string);

				exp[killerid] = exp[killerid] + 10 + (lvl[playerid]*10);

			    format(string, sizeof(string), "[EXP] Earned [%d]exp!", 10 + (lvl[playerid]*10));
				SendClientMessage(killerid, COLOR_YELLOW, string);
	        }
	    }
	}
	if (tank[playerid] != 0)
	{
	    DestroyVehicle(tank[playerid]);
	    tank[playerid] = 0;
	}
	
	return 1;
}