[ReVo_]

You can use OnPlayerDisconnect and OnPlayerConnect to update your variable, and then use the timer just to show the sendclientmessage.

Код:

new on‌linePlayers = 0;

public OnPlayerConnect(playerid) { onlinePlayers++; }
public OnPlayerDisconnect(playerid, reason) { onlinePlayers--; }
public Timer() { new str [ 30 ]; format(str, sizeof str, "Online players: %d", onlinePlayers); SendClientMessageToAll(-1, onlinePlayers); }

Much better than count players every 15 mins