public OnPlayerConnect(playerid)
{
    new string[64], pName[MAX_PLAYER_NAME];
    GetPlayerName(playerid,pName,MAX_PLAYER_NAME);
    format(string,sizeof string,"%s has joined the server. Welcome!",pName);
    SendClientMessageToAll(0xFFFFFFAA,string);
    return 1;
}
public OnPlayerDisconnect(playerid, reason)
{
    new
        string[64],
        name[MAX_PLAYER_NAME];
    GetPlayerName(playerid,name,MAX_PLAYER_NAME);
    switch(reason)
    {
        case 0: format(string,sizeof string,"%s left the server. (Timed out)",name);
        case 1: format(string,sizeof string,"%s left the server. (Leaving)",name);
        case 2: format(string,sizeof string,"%s left the server. (Kicked/Banned)",name);
    }
    SendClientMessageToAll(0xFFFFFFAA,string);
    return 1;
}