[SpikY_]

the codes up looks some messy,
try this:

PHP код:

forward VehicleOccupied(vehicleid);
CMD:respawncars(playerid, params[])
{
    GetPlayerName(playerid, sendername, sizeof(sendername));    
    new string[128];
    format(string,sizeof(string),"{FF0000}» Admin: %s has respawned all un-occupieded vehicles.", sendername);
    SendClientMessageToAll(-1, string);
    GameTextForAll("~n~~n~~n~~n~~n~~n~~r~Vehicles ~g~Respawned", 3000,3);
    for(new cars=0; cars<MAX_VEHICLES; cars++)
    {
        if(!VehicleOccupied(cars))
        {
            SetVehicleToRespawn(cars);
        }
    }
    return 1;
}
public VehicleOccupied(vehicleid)
{
    for(new i=0;i<MAX_PLAYERS;i++)
    {
        if(IsPlayerInVehicle(i,vehicleid)) return 1;
    }
    return 0;
}