[AVC] Admin Voice Channel

#include <sourcemod>
#include <sdktools>

#define PREFIX "\x01[\x05AVC\x01]"
bool Channel[32] = false;

public Plugin myinfo =
{
    name = "[AVC] Admin Voice Channel",
    author = "BaroNN",
    description = "",
    version = "1.0",
    url = "http://steamcommunity.com/id/BaRoNN-Main"
};

public void OnPluginStart()
{
    RegConsoleCmd("sm_admintalk", Command_AdminChannel);
    RegConsoleCmd("sm_avc", Command_AdminChannel);
}

public Action ShowMenu(int client)
{
    if(!IsValidClient(client))
    {
        PrintToChat(client, "%s \x02You are not allowed to use the admintalk", PREFIX)
        return Plugin_Handled;
    }

    char CF[512];
    Menu menu = new Menu(AdminMenuHandler);
    menu.SetTitle("[AVC] Admin Voice Channel");
    FormatEx(CF, sizeof(CF), "Admin Channel: [%s]", (Channel[client])? "ON":"OFF");
    menu.AddItem("", CF);
    menu.Display(client, MENU_TIME_FOREVER);
    return Plugin_Handled;
}

public int AdminMenuHandler(Menu menu, MenuAction action, int client, int item)
{
    if(action == MenuAction_Select)
    {
        Channel[client] = !Channel[client];
        SetClientVoice(client, Channel[client]);
        if(Channel[client])PrintToChat(client, "%s \x10You have entered\x01 the admin voice channel", PREFIX);
        else PrintToChat(client, "%s \x04You have %s quit\x01 the admin voice channel", PREFIX);
        ShowMenu(client);
    }
}

public void SetClientVoice(int client, bool adminchannel)
{
    for(int i = 1; i <= MaxClients; i++)
    {
        if(IsValidClient(i))
        {
            ListenOverride override = ((adminchannel && Channel[i]) || (!adminchannel && !Channel[i]))? Listen_Yes:Listen_No;
            SetListenOverride(i, client, override);
            SetListenOverride(client, i, override);
        }
    }
}

public OnClientPostAdminCheck(int client)
{
    Channel[client] = false;
}

public Action Command_AdminChannel(int client, int args)
{
    if(IsValidClient(client))ShowMenu(client);
}

stock bool IsValidClient(int client)
{
    if (client >= 1 && client <= MaxClients && IsClientConnected(client) && IsClientInGame(client) && !IsFakeClient(client) && !IsClientSourceTV(client) && !CheckCommandAccess(client, "sm_admin", ADMFLAG_GENERIC))return true;
    return false;
}