[Mencent]

PHP код:

SetTimerEx("LoadTrailers", 1000, false, "dd", tmpcar,playerid);
forward LoadTrailers(vehicleid,playerid);
public LoadTrailers(vehicleid,playerid)
{
    if(IsPlayerInVehicle(playerid,vehicleid))
    {
        new vehicleid = GetPlayerVehicleID(playerid);
        new tmpcar = GetPlayerVehicleID(playerid);
        AttachTrailerToVehicle(PlayerData[playerid][pTrailer],tmpcar);
    }
    return 1;
} 


You have to look how you use playerid, and so on.