[DeathOnaStick]

It's not a Tuturial, but i fixed the code from this one(CLICK)

For explaination just read the Tuturial.

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Over script:

pawn Code:

enum pInfo
{
    Cash
}

new PlayerInfo[MAX_PLAYERS][pInfo];
new IsPlayerLogged[MAX_PLAYERS];

OnPlayerCommandText:

pawn Code:

dcmd(register, 8, cmdtext);
dcmd(login, 5, cmdtext);

Somewhere else:

pawn Code:

dcmd_register(playerid, params[])
{
    new file[MAX_PLAYER_NAME+4];
        new PName[MAX_PLAYER_NAME];
        new Pass[50];

      if(sscanf(params, "s", Pass))return SendClientMessage(playerid, COLOR_ORANGE, "USAGE: /register [Password] (maximum: 50 cells)");
      if(IsPlayerLogged[playerid]==1)return SendClientMessage(playerid, COLOR_SYSTEM, "You're already logged in!");

      GetPlayerName(playerid, PName, sizeof(PName));
      format(file,sizeof(file),"D-Admin/Players/%s.ini",PName);

      if(!fexist(file))
            {
              dini_Create(file);
              dini_IntSet(file,"Password", udb_hash(Pass));
              dini_IntSet(file,"Cash", 0);
              SendClientMessage(playerid, COLOR_SYSTEM, "[System]: Account Created! Please log in with /login.");
              PlayerPlaySound(playerid,1057,0.0,0.0,0.0);
              printf("[Register]%s has created an account!", PName);
            }
            else
            {
              SendClientMessage(playerid, COLOR_SYSTEM, "[System]: Account Already Found In Database");
        PlayerPlaySound(playerid,1057,0.0,0.0,0.0);
            }
        return 1;
}

pawn Code:

dcmd_login(playerid, params[])
{
  new file[MAX_PLAYER_NAME+4];
  new PlayerName[MAX_PLAYER_NAME];
    new LogPass[50];
    if(sscanf(params, "s", LogPass))return SendClientMessage(playerid, COLOR_ORANGE, "USAGE: /login [password]");

    if(IsPlayerLogged[playerid] == 1)
    {
        SendClientMessage(playerid, COLOR_GREEN, "You already are logged in!");
        return 1;
    }
    else
    {
        GetPlayerName(playerid, PlayerName, sizeof(PlayerName));
        format(file,sizeof(file),"D-Admin/Players/%s.ini",PlayerName);
        if(fexist(file))
        {
          new FilePass[256];
        FilePass = dini_Get(file, "Password");
            if(udb_hash(LogPass) != strval(FilePass))
            {
              SendClientMessage(playerid, COLOR_RED, "Login Failed!");
              printf("%s has failed logging in!", PlayerName);
            }
            else
            {
                IsPlayerLogged[playerid] = 1;
                SetPlayerMoney(playerid, dini_Int(file, "Cash"));
                PlayerInfo[playerid][Cash] = dini_Int(file, "Cash");
                SendClientMessage(playerid, COLOR_GREEN, "[System]: You logged in!");
                PlayerPlaySound(playerid,1058,0.0,0.0,0.0);
            }
        }
    }
    return 1;
}

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Cheers.