Mine

public GetVehicleDriverID(vehicleid, passengerplayerid)
{
	new Result = -1;
 	SendClientMessageToAll(COLOR_WHITE, "G: Starting DriverID loop...");
	for(new i=0; i<MAX_PLAYERS;i++)
	{
	    //We dont want to scan the passenger player ID..
	    if(i != passengerplayerid)
	    {
		    //Check if this player is inside the vehicle ID Supplied
		    if(IsPlayerInVehicle(i,vehicleid)) {
 				SendClientMessageToAll(COLOR_WHITE, "H: Found a player in the given vehicleid");
				Result = i;
				break;
		    }
		}
	}
	new str[STR_LEN] = "";
 	SendClientMessageToAll(COLOR_WHITE, "I: Ending DriverID loop, returning result.");
	format(str, STR_LEN, "DriverID returns %d", Result);
	SendClientMessageToAll(COLOR_WHITE, str);
	return Result;
}