[Micko123]

First you make timer
Then you do this

PHP код:

new Timer1[MAX_PLAYERS];
public OnPlayerConnect(playerid)
{
    Timer1[playerid] = SetTimerEx(blah blah blah);
    return 1;
}
public OnPlayerDisconnect(playerid, reason)
{
    KillTimer(Timer1[playerid])
    return 1;
}