code

#include <a_samp>
#include <YSF>
new static bool: Visible[MAX_PLAYERS] = true;

public OnPlayerConnect(playerid)
{
    Visible[playerid] = true;
    CallLocalFunction("HOOK_OnPlayerConnect", "i", playerid);
    return 1;
}

#if defined _ALS_OnPlayerConnect
  #undef OnPlayerConnect
#else
#define _ALS_OnPlayerConnect
#endif

#define OnPlayerConnect HOOK_OnPlayerConnect

forward HOOK_OnPlayerConnect(playerid);

stock IsPlayerVisible(playerid)
{
    if(Visible[playerid] == true)
        return 1;

    return 0;
}

stock SetPlayerVisible(playerid, bool: visible_)
{
    if(visible_)
    {
        if(Visible[playerid])
        {
            SyncPlayerVisible(playerid); // player is already visible, so sync it just in case
            return 1;
        }

        else
        {
            Visible[playerid] = true;
            SyncPlayerVisible(playerid);
        }
    }

    else
    {
        Visible_[playerid] = false;
        SyncPlayerVisable(playerid);
        return 1;
    }
}

static stock SyncPlayerVisible(playerid)
{
    if(IsPlayerConnected(playerid))
    {
        if(Visible[playerid])
        {
            for(new i; i < MAX_PLAYERS; i++)
            {
                if(!IsPlayerConnected(i)) continue;

                ShowPlayerForPlayer(i, playerid);
            }
        }
        else
        {
            for(new i; i < MAX_PLAYERS; i++)
            {
                if(!IsPlayerConnected(i)) continue;
                ShowPlayerForPlayer(i, playerid);
            }
        }
    }

    return 1;
}

public OnPlayerStreamIn(playerid, forplayerid)
{
    if(Visible[playerid])
    {
        ShowPlayerForPlayer(forplayerid, playerid);
    }
    else HidePlayerForPlayer(forplayerid, playerid);
    CallLocalFunction("HOOK_OnPlayerStreamIn", "ii", playerid, forplayerid);
    return 1;
}

#if defined _ALS_OnPlayerStreamIn
  #undef OnPlayerStreamIn
#else
#define _ALS_OnPlayerStreamIn
#endif

#define OnPlayerStreamIn HOOK_OnPlayerStreamIn

forward HOOK_OnPlayerStreamIn(playerid, forplayerid);