[Luis-]

That'd be a simple variable like,

pawn Код:

new PlayerJoinedDMZone[MAX_PLAYERS];

When a player types the /dm command add in this;

pawn Код:

PlayerJoinedDMZone[playerid] = 1;

So when he dies he'll be spawned back inside the DM zone;

pawn Код:

public OnPlayerDeath(playerid, killerid, reason) {
if(PlayerJoinedDMZone[playerid] == 1) {
        new randomcoords = random(sizeof(DMSpawn));
        SetPlayerPos(playerid, DMSpawn[randomcoords][0], DMSpawn[randomcoords][1], DMSpawn[randomcoords][2]);
}
return 1;
}

Then simply, the /leavedm command would be something like this;

pawn Код:

CMD:leavedm(playerid, params[]) {
        PlayerJoinedDMZone[playerid] = 0;
        SendClientMessage(playerid, -1, "You've left the DM zone.");
        return 1;
}