public OnPlayerConnect(playerid)
{
    new pName[24];
    new str[128];
    GetPlayerName(playerid, pName, 24);
    format(str, 128, "%s has joined the server", pName);
    SendClientMessageToAll(0xAFAFAFAA, str);
    return 1;
}

public OnPlayerDisconnect(playerid, reason)
{
    new pName[24];
    new str[128];
    GetPlayerName(playerid, pName, 24);

    switch(reason)
        {
            case 0: format(str, 128, "%s has left. (Timeout)", pName);
            case 1: format(str, 128, "%s has left. (Leaving)", pName);
            case 2: format(str, 128, "%s has left. (Kicked)", pName);
        }
    SendClientMessageToAll(0xAFAFAFAA, str);
    return 1;
}