[ipsLuan]

Troque sua callback por essa:

PHP код:

stock GetEmptyVehicleSeat(vehicleid)
{
    new Seat[4];
    for(new i; i < MAX_PLAYERS; i++)
    {
        if(IsPlayerConnected(i))
        {
            if(IsPlayerInVehicle(i, vehicleid))
            {
                if(GetPlayerVehicleSeat(i) == 0) Seat[0] = true;
                if(GetPlayerVehicleSeat(i) == 1) Seat[1] = true;
                if(GetPlayerVehicleSeat(i) == 2) Seat[2] = true;
                if(GetPlayerVehicleSeat(i) == 3) Seat[3] = true;
            }
        }
    }
    for(new a; a < sizeof(Seat); a++)
    {
        if(Seat[a] == false) return false;
    }
    return true;
} 


E use assim:

PHP код:

if(!GetEmptyVehicleSeat(vehicleid)) return SendClientMessage(playerid, -1, "Veiculo cheio."); 


Fiz pela lуgica, nгo testei.