[Konstantinos]

pawn Код:

public OnPlayerCommandText(playerid, cmdtext[])
{
    if (!strcmp(cmdtext, "/respawnall", true))
    {
        if (!IsPlayerAdmin(playerid)) return SendClientMessage(playerid, -1, "You need to be RCON admin to use this command.");
        for (new v = 1; v != MAX_VEHICLES; ++v)
        {
            if (!GetVehicleModel(v)) continue; // vehicle doesn't exist, skip it..
            if (!IsVehicleOccupied(v)) SetVehicleToRespawn(v); // vehicle is not occupied, respawn it..
        }
        return 1;
    }
    return 0;
}

IsVehicleOccupied(vehicleid)
{
    foreach(new i : Player)
    {
        if (IsPlayerInVehicle(i, vehicleid) return 1;
    }
    return 0;
}

I used foreach because it's faster since it loops through connected players only.
I'm going to say this - you shouldn't be using strcmp for commands but ZCMD or y_commands because they're faster.

Last, getting warnings about loosing indentation does not mean the code is wrong. All you have to do is indent the code properly: https://sampwiki.blast.hk/wiki/Errors_Li...se_indentation