[Walsh]

I found a better way that actually works using a PlayerCount variable. (duh)

pawn Code:

new Timer,PlayerCount;
public OnGameModeInit()
{
    PlayerCount = 0; // Whenever the server is executed, player count will be zero
    return 1;
}
public OnPlayerConnect(playerid)
{
    Timer = SetTimer("YourFunction",5000,true); // Repeats a timer of 5 seconds
    PlayerCount++; // Whenever a player connects player count will inscrease by 1.
    return 1;
}
public OnPlayerDisconnect(playerid)
{
    PlayerCount--; // When a player disconnects player count will decrease by 1.
    return 1;
}
forward YourFunction();
public YourFunction() // Every 5 seconds....
{
    // Object Code here
    if(PlayerCount == 0) // If no players are on then....
    {
        KillTimer(Timer); // kill the timer.
    }
    return 1;
}