App\Http\Controllers\UserController::save PHP Method

    public function save($userPublicId = false)
    {
        if (Auth::user()->hasFeature(FEATURE_USERS)) {
            $rules = ['first_name' => 'required', 'last_name' => 'required'];
            if ($userPublicId) {
                $user = User::where('account_id', '=', Auth::user()->account_id)->where('public_id', '=', $userPublicId)->withTrashed()->firstOrFail();
                $rules['email'] = 'required|email|unique:users,email,' . $user->id . ',id';
            } else {
                $rules['email'] = 'required|email|unique:users';
            }
            $validator = Validator::make(Input::all(), $rules);
            if ($validator->fails()) {
                return Redirect::to($userPublicId ? 'users/edit' : 'users/create')->withInput()->withErrors($validator);
            }
            if ($userPublicId) {
                $user->first_name = trim(Input::get('first_name'));
                $user->last_name = trim(Input::get('last_name'));
                $user->username = trim(Input::get('email'));
                $user->email = trim(Input::get('email'));
                if (Auth::user()->hasFeature(FEATURE_USER_PERMISSIONS)) {
                    $user->is_admin = boolval(Input::get('is_admin'));
                    $user->permissions = Input::get('permissions');
                }
            } else {
                $lastUser = User::withTrashed()->where('account_id', '=', Auth::user()->account_id)->orderBy('public_id', 'DESC')->first();
                $user = new User();
                $user->account_id = Auth::user()->account_id;
                $user->first_name = trim(Input::get('first_name'));
                $user->last_name = trim(Input::get('last_name'));
                $user->username = trim(Input::get('email'));
                $user->email = trim(Input::get('email'));
                $user->registered = true;
                $user->password = str_random(RANDOM_KEY_LENGTH);
                $user->confirmation_code = str_random(RANDOM_KEY_LENGTH);
                $user->public_id = $lastUser->public_id + 1;
                if (Auth::user()->hasFeature(FEATURE_USER_PERMISSIONS)) {
                    $user->is_admin = boolval(Input::get('is_admin'));
                    $user->permissions = Input::get('permissions');
                }
            }
            $user->save();
            if (!$user->confirmed) {
                $this->userMailer->sendConfirmation($user, Auth::user());
                $message = trans('texts.sent_invite');
            } else {
                $message = trans('texts.updated_user');
            }
            Session::flash('message', $message);
        }
        return Redirect::to('settings/' . ACCOUNT_USER_MANAGEMENT);
    }