[Scenario]

The first option just seems like a bad idea to me.

However, the second option seems to work fine most of the time. If you REALLY want to make a player invisible, the code below should work fine:

pawn Код:

new
    bool:g_Invisible[playerid] = false
;

CMD:toginvisibility(playerid, params[])
{
    new
        vehID = GetPlayerVehicleID(playerid)
    ;
    
    if(vehID == INVALID_VEHICLE_ID)
            return 1;

    if(!g_Invisible[playerid])
    {   
        g_Invisible[playerid] = true;
        LinkVehicleToInterior(vehID, playerid*5); // taking the player's ID and multiplying it by 5 means they will (generally) never be in the same VW as another player
        for(new i = 0; i < MAX_PLAYERS; i++) ShowPlayerNameTagForPlayer(i, playerid, 0); // normally I'd use foreach here, but whatever
    }
    else
    {
        g_Invisible[playerid] = false;
        LinkVehicleToInterior(vehID,  0);   
        for(new i = 0; i < MAX_PLAYERS; i++) ShowPlayerNameTagForPlayer(i, playerid, 1); // normally I'd use foreach here, but whatever
    }
    return 1;
}