[Kostas']

I am not sure if this works. But I suggest you to add the muted at the Admin's enum.
It's easier to use it.

pawn Код:

public OnPlayerText(playerid, text[])
{
    if(Muted[playerid] == 1) return SendClientMessage(playerid, COLOR_ERROR, "You are currently muted and cannot type in the chatbox.");
    else {
        new
            string[128],
            playername[MAX_PLAYER_NAME],
            PlayerColor = GetPlayerColor(playerid);
        GetPlayerName(playerid, playername, sizeof(playername));
        format(string, sizeof(string), "%s[%d]: {FFFFFF}%s", playername, playerid, text);
        SendClientMessageToAll(PlayerColor, string);
    }
    return 0;
}