[Kuddy]

Deve funcionar:

pawn Код:

new pChannel[MAX_PLAYERS];

CMD:n(playerid, params[]){
    if(pChannel[playerid] == 0) return SendClientMessage(playerid, -1, "Vocк nгo estб em nenhum canal");
    if(strlen(params) == 0) return SendClientMessage(playerid, -1, "Digite alguma coisa.");
    new strin[128];
    format(strin, 128, "%s (%d): %s.", PlayerGetName(playerid), playerid, params);
    for(new k=0; k<MAX_PLAYERS; k++) if(pChannel[k]==pChannel[playerid]) SendClientMessage(playerid, -1, strin);
    return 1;
}

CMD:joinchannel(playerid, params[]){
    new strin[128], num;
    if(!sscanf(params, "d", num)) return SendClientMessage(playerid, -1, "Digite um canal vбlido.");
    if(num==0 && pChannel[playerid]!=0) format(strin, 128, "Vocк saiu do canal.",num);
    else if(num==0) format(strin, 128, "Vocк nгo estб em nenhum canal.");
    else format(strin, 128, "Vocк entrou no canal %d.",num);
    SendClientMessage(playerid, -1, strin);
    pChannel[playerid] = num;
    return 1;
}

public OnPlayerDisconnect(playerid, reason) {
    pChannel[playerid] = 0;
    return 1;
}

stock PlayerGetName(playerid)
{
    new Nome[MAX_PLAYER_NAME];
    GetPlayerName(playerid, Nome, MAX_PLAYER_NAME);
    return Nome;
}

Fiz correndo e nгo compilei/testei, se tiver algum erro й sу avisar.