[Dusan01]

you are doing all wrong, try like this:

PHP код:

CMD:towcar(playerid, params[]){
    if (GetVehicleModel(GetPlayerVehicleID(playerid)) != 525) return SendClientMessage(playerid, COLOR_GREY, "You have to be in TowCar to use this command.");
    new Float:pX, Float : pY, Float : pZ;
    GetPlayerPos(playerid, pX, pY, pZ);
    new Float:vX, Float : vY, Float : vZ;
    new Found = 0;
    new vid = 0;
    while ((vid<MAX_VEHICLES) && (!Found)) {
        vid++;
        GetVehiclePos(vid, vX, vY, vZ);
        if ((floatabs(pX - vX)<7.0) && (floatabs(pY - vY)<7.0) && (floatabs(pZ - vZ)<7.0) && (vid != GetPlayerVehicleID(playerid))) {
            Found = 1;
            if (IsTrailerAttachedToVehicle(GetPlayerVehicleID(playerid))) {
                DetachTrailerFromVehicle(GetPlayerVehicleID(playerid));
            }
            AttachTrailerToVehicle(vid, GetPlayerVehicleID(playerid));
            SendClientMessage(playerid, 0xFFFF00AA, "Car towed!");
        }
    }
    if (!Found) {
        SendClientMessage(playerid, 0xFFFF00AA, "There is no car in range.");
    }
    return 1;
}