GivePlayerPCash(playerid, dini_Int(file, "PCash"));

public OnPlayerConnect(playerid)
{
    ShowPlayerDialog(playerid, ..................);
    return 1;
}

public OnPlayerDisconnect(playerid, reason)
{
    if(!fexist(file))// this shoud be like this.
    {//                 because it file doesn't exitst than you will create one.
          dini_Create(file);
    }
    dini_IntSet(file, "PCash", GetPlayerPCash(playerid));
    ResetPlayerPCash(playerid);
    return 1;
}

public OnPlayerConnect(playerid)
{
    new name[MAX_PLAYER_NAME], file[128], string[128];
    GetPlayerName(playerid, name, sizeof(name));
    format(file, sizeof(file), SERVER_USER_FILE, name);
    if (!dini_Exists(file))
    {
        format(string, sizeof(string), "The username %s is not in the datebase please register", name);
        SendClientMessage(playerid, White, string);
        ShowPlayerDialog(playerid, 1, DIALOG_STYLE_INPUT, "Account", "Register account\n\nEnter password:", "Register", "Quit");
    }
    if(fexist(file))
    {
        ShowPlayerDialog(playerid, 2, DIALOG_STYLE_INPUT, "Account", "Login to your account\n\nEnter your password:", "Login", "Quit");
        format(string, sizeof(string), "The username %s is registered login to your account", name);
        SendClientMessage(playerid, Green, string);
    }
    return 1;
}