[dice7]

Or a much simpler version

pawn Code:

public OnPlayerCommandText(playerid, cmdtext[])
 {
    if (strcmp(cmdtext, "/leavedm") == 0)
    {
        IsPlayerInDM[playerid] = 0;
        SendClientMessage(playerid, COLOR_RED, "You left the dm, you can now use other commands");
        return 1;
    }

    if (IsPlayerInDM[playerid] != 0) return SendClientMessage(playerid, COLOR_RED, "You can't use commands while in a dm");


    //other commands

    return 0;
 }