[iggy1]

pawn Код:

new bool:afk_mute[ MAX_PLAYERS char ];//global var
//put this is OnPlayerDisConnect
afk_mute{ playerid } = false ;
//

public OnPlayerText(playerid, text[])
{
    if(afk_mute{ playerid } ==  true )
    {
        SendClientMessage(playerid, 0xFF0000AA, "You are AFK! You cannot talk");
        return 0;
    }
    return 1;
}

public OnPlayerCommandText(playerid, cmdtext[])
{
    if (!strcmp("/afk", cmdtext, true))
    {
        if(afk_mute{ playerid } != true) {
            afk_mute =  true ;
            //send message that they are afk
        }
        else {
            afk_mute{ playerid } = false ;
            //send message that they are not afk
        }
        return 1;
    }
    return 0;
}

EDITED: First way wouldn't work. (still tierd)