[Kwarde]

Somewhere above in your script:

pawn Код:

new bool:AFK[MAX_PLAYERS];

Then in the command where he goes afk:

pawn Код:

AFK[playerid] = true;

When he goes back:

pawn Код:

AFK[playerid] = false;

and in the OnPlayerText(playerid, text[]):

pawn Код:

if(AFK[playerid]) return SendClientMessage(playerid, 0xFF0000AA, "You are AFK! You cannot talk");