[LarzI]

Well, it's quite simple, really.

First make a global bool to store information if the certain playerid is DnD or not:

pawn Код:

g_IsDnD[ MAX_PLAYERS ]; //The array is to be to set for individual players

Then you have to make sure it's set to false when players disconnects, so that it won't stay activated after a player leaves and another one joins with the same playerid

pawn Код:

//OnPlayerDisconnect
g_IsDnD[ playerid ] = false;

Now you may create your command, which should simply toggle the g_IsDnD variable; something like this:

pawn Код:

CMD:dnd(playerid, params[]) //zcmd
{
    if( g_IsDnD[ playerid ] )
    {
        g_IsDnD[ playerid ] = false;
    }
    else
    {
        g_IsDnD[ playerid ] = true;
    }
    return true;
}

Now, for the OnPlayerPrivMsg callback, simply insert this piece of code:

pawn Код:

//OnPlayerPrivMsg
if( g_IsDnD[ recieverid ] ) //you want to check if the reciever is DnD, not the sender(playerid)
{
    return false; //return the callback to not execute more code - make it false to not send the message
}

And there you have it.