我是 Laravel 的初學者。我想根據用戶角色限制用戶會話/登錄。所以我在我的登錄控制器中有這個方法。我有兩個角色基本的夫妻public function authenticated(Request $request, User $user){    if(Auth::check()) { //check if the user is logged in or not        $user = Auth::user();        if ($user->isBasic()) {            $previous_session = $user->session_id;            if ($previous_session) {                \Session::getHandler()->destroy($previous_session);            }            Auth::user()->session_id = \Session::getId();            Auth::user()->save();            return redirect(route('home'));        } elseif ($user->isCouple()) { //check if the user is logged in or not            $previous_session = $user->session_id;            $login = $user->no_of_logins;            if ($previous_session) {                if($login > 2) {                    \Session::getHandler()->destroy($previous_session);                    Auth::user()->no_of_logins = $user->decrement('no_of_logins');                }            }            Auth::user()->session_id = \Session::getId();            Auth::user()->no_of_logins = $user->increment('no_of_logins');            Auth::user()->save();            return redirect(route('home'));        }    }}}elseif 語句對我不起作用。我不知道該怎么做。在我的桌子上，我有這個public function up(){    Schema::create('users', function (Blueprint $table) {        $table->bigIncrements('id');        $table->string('name');        $table->string('email')->unique();        $table->enum('role', ['subscriber', 'admin', 'basic', 'couple', 'family'])->default('subscriber');        $table->timestamp('email_verified_at')->nullable();        $table->string('avatar')->nullable();        $table->integer('no_of_logins')->default(0);        $table->string('session_id')->nullable();        $table->string('password')->nullable();        $table->rememberToken();        $table->timestamps();    });}