[Scenario]

Something like this would work:

pawn Код:

stock DoesVehicleHaveDriver(vehicleid)
{
    #if defined foreach
    foreach(new i : Player)
    #else
    for(new i = 0; i < MAX_PLAYERS; i++)
    #endif  
    {
        if(GetPlayerVehicleID(i) == vehicleid && GetPlayerState(i) == PLAYER_STATE_DRIVER) return true;
    }
    return false;
}