[FuznesS]

Код:

CMD:tow(playerid, params[])
{
    new vehicle, trailerid;
    if(sscanf(params,"i", trailerid)) return SendClientMessage(playerid,-1,"USAGE: /tow [trailerid]");
	vehicle = GetPlayerVehicleID(playerid);
	if(!IsTrailerAttachedToVehicle(vehicle))
	{
	    AttachTrailerToVehicle(trailerid, vehicle);
	    SendClientMessage(playerid, -1, "You have successfully attached your trailer to your vehicle");
	}
	return 1;
}

I'm using here sscanf and zcmd, you can change it, but Enjoy.

EDIT: if you don't want with sscanf

Код:

CMD:tow(playerid, params[])
{
    new vehicle;
    if(isnull(params))
        return SendClientMessage(playerid, -1, "USAGE: /tow [trailerid]");
	vehicle = GetPlayerVehicleID(playerid);
	if(!IsTrailerAttachedToVehicle(vehicle))
	{
	    AttachTrailerToVehicle(strval(params), vehicle);
	    SendClientMessage(playerid, -1, "You have successfully attached your trailer to your vehicle");
	}
	return 1;
}