[Dayrion]

PHP код:

OnGamemodeInit()...
    SetTimer("CheckAFK", 800, true);

PUBLIC:CheckAFK()
{
    foreach(new i : Player)
    {
        if(gettime() - AFKDetect[i] > 5 && !IsPlayerAFK[i])
        {
            IsPlayerAFK[i] = true;
            TogglePlayerControllable(i, false);
            SCMTAE(RED, "%s is now AFK.", GetName(i));
        }
        else if(gettime() - AFKDetect[i] < 5 && IsPlayerAFK[i])
        {
            IsPlayerAFK[i] = false;
            TogglePlayerControllable(i, true);
            SCMTAE(RED, "%s is not anymore AFK.", GetName(i));
        }
    }
    return 1;
}

OnPlayerUpdate()..
AFKDetect[playerid] = gettime(); 


I don't really now if it's optimized. ;p