[Lazarus]

pawn Код:

//top of script
new attached[MAX_PLAYERS];
forward OnTrailerAttach(playerid, vehicleid, tailorid);

//onplayerupdate
public OnPlayerUpdate(playerid)
{
    if(IsTrailerAttachedToVehicle(GetPlayerVehicleID(playerid)) == 1 && attached[playerid] == 0)
    {
        OnTrailerAttach(playerid, GetPlayerVehicleID(playerid), GetVehicleTrailer(GetPlayerVehicleID(playerid)));
        attached[playerid] = 1;
    }

    if(IsTrailerAttachedToVehicle(GetPlayerVehicleID(playerid)) == 0 && attached[playerid] == 1)
    {
        attached[playerid] = 0;
    }
    return 1;
}

//onplayerconnect
public OnPlayerConnect(playerid)
{
    attached[playerid] = 0;
    return 1;
}

//here's your function
public OnTrailerAttach(playerid, vehicleid, tailorid)
{
    // Do something here
    return 1;
}