[edon1337]

Originally Posted by E1_531G if(is_user_alive(id)) - if true, player is connected and alive. if(is_user_connected(id) && !is_user_alive(id)) - if true, player is connected but not alive.

There's no need to check is_user_connected if you're already checking is_user_alive.
is_user_alive itself checks if player is connected.

static cell AMX_NATIVE_CALL is_user_alive(AMX *amx, cell *params) /* 1 param */
{
    int index = params[1];

    if (index < 1 || index > gpGlobals->maxClients)
    {
        return 0;
    }

    CPlayer* pPlayer = GET_PLAYER_POINTER_I(index);

    if (g_bmod_tfc)
    {
        edict_t *e = pPlayer->pEdict;
        if (e->v.flags & FL_SPECTATOR ||
            (!e->v.team || !e->v.playerclass))
        {
            return 0;
        }
    }

    return ((pPlayer->ingame && pPlayer->IsAlive()) ? 1 : 0);
}