[redivcram]

Thanks,

Here's what I've done.

PHP Code:

#include <amxmodx>
#include <nvault>
#include <nvault_array>

// The Data
enum _:SomeValuableData{coins, keys, chips, rocks, gems, gold, successinpawn};

// 1st Dimension: Player's ID
// 2nd Dimension: Max Data
new g_iDataHolder[33][SomeValuableData];

new g_iVault;

public plugin_init()
{
    register_plugin("qwe", "rty", "uiop");

    register_clcmd("change_data", "ChangeYourOwnData");
    register_clcmd("save_data", "SaveVault");

    g_iVault = nvault_open("hgrp");
}

public plugin_end()
    nvault_close(g_iVault);

public client_putinserver(id)
{
    new i;

    // First set every data to 0
    for(i = 0; i < 8; i++)
        g_iDataHolder[id][i] = 0

    // successinpawn aka g_iDataHolder[id][7] should be set to 100 by default (For newcomers aka people who didn't save anything in vault)
    g_iDataHolder[id][successinpawn] = 100;

    LoadVault(id);
}

public ChangeYourOwnData(id)
{
    new szArgv_Select[2], szArgv_Set[4];

    read_argv(1, szArgv_Select, charsmax(szArgv_Select));
    read_argv(2, szArgv_Set, charsmax(szArgv_Set));

    // No checks for empty strings/boundaries necessary since its known what to type in this small temporary example

    g_iDataHolder[id][str_to_num(szArgv_Select)] = str_to_num(szArgv_Set);

    SaveVault(id);

    return PLUGIN_CONTINUE;
}

public SaveVault(id) 
{
    new szAuthID[32], szKey[32];

    get_user_authid(id, szAuthID, charsmax(szAuthID));

    format(szKey, charsmax(szKey), "%s-heyo", szAuthID);

    nvault_set_array(g_iVault, szKey, g_iDataHolder[id], sizeof(g_iDataHolder[]));

    return PLUGIN_HANDLED;
} 

public LoadVault(id) 
{ 
    new szAuthID[32], szKey[32];

    get_user_authid(id, szAuthID, charsmax(szAuthID));

    format(szKey, charsmax(szKey), "%s-heyo", szAuthID);
     
    nvault_get_array(g_iVault, szKey, g_iDataHolder[id], sizeof(g_iDataHolder[]));

    return PLUGIN_HANDLED;
} 


But, here's an error

L 06/10/2018 - 14:37:11: [AMXX] Plugin ("nvault_problem.amxx") is setting itself as failed.
L 06/10/2018 - 14:37:12: [AMXX] Plugin says: [nVault Array] Can only use nvault_get_array() on data that was saved using nvault_set_array().
L 06/10/2018 - 14:37:12: [AMXX] Displaying debug trace (plugin "nvault_problem.amxx")
L 06/10/2018 - 14:37:12: [AMXX] Run time error 1: forced exit 
L 06/10/2018 - 14:37:12: [AMXX]    [0] nvault_array.inc::nvault_get_array (line 107)
L 06/10/2018 - 14:37:12: [AMXX]    [1] nvault_problem.sma::LoadVault (line 78)
L 06/10/2018 - 14:37:12: [AMXX]    [2] nvault_problem.sma::client_putinserver (line 38)

It is supposed to load the client's data when they connect. I performed a check before getting your modified nvault and the new nvault_array lib using nvault_lookup, but it doesn't work properly with arrays, I guess, I always seemed to get false when checking whether data existed with its suitable key.