$users = getUsersFromDb();
        $prizes = getPrizeList();

        foreach($prizes as $prize => $cnt) {
            for($i = 1; $i <= $cnt; $i++) {
                while(!$randomUser) {
                    $randomKey = array_rand($users);
                    $randomUser = $users[$randomKey];
                    $randomUser->setPrize($prize)->save();
                    unset($users[$randomKey]);
                    $randomUser = null;
                    break;
                }
            }
        }