[Facerafter]

That creates a variable for every player that can join the server and connect it to the playerid.
The "new" creates the variable. ";" ends the line and defines the start of a new one.

With this you could for example do:

Код:

public OnPlayerDeath(playerid, killerid, reason)
{
        PlayerDeaths[playerid] ++;
        PlayerKills[killerid] ++; // ++ means add 1 to the current value.
	return 1;
}

And no this has nothing to do with enums but it can also be done with a enum.
The current way the value will reset on server restart and needs to be de reset everytime a player disconnects or joins.

Код:

public OnPlayerConnect(playerid)
{
     PlayerDeaths[playerid] = 0;
     PlayerKills[playerid] = 0;
     return 1;
}

Enum example:

Код:

enum pInfo
{
    pDeaths,
    pKills
}
new PlayerInfo[MAX_PLAYERS][pInfo];

public OnPlayerDeath(playerid, killerid, reason)
{
        PlayerInfo[playerid][pDeaths] ++;
        PlayerInfo[killerid][pKills] ++; // ++ means add 1 to the current value.
	return 1;
}