arm-api/app/Http/ViewComposers/LeftMenuComposer.php

<?php

namespace App\Http\ViewComposers;

use Auth;
use App\Models\FunMenu;
use Illuminate\View\View;

class LeftMenuComposer
{

    protected $user_id;
    protected $user_name;

    public function __construct()
    {
        if (Auth::check()) {
            // 這個使用者已經登入...
            $user = Auth::user();

            $this->user_id = $user->id;
            $this->user_name = $user->name;
        } else {
            $this->user_id = 0;
            $this->user_name = "Guest";
        }
    }

    public function compose(View $view)
    {
        $view->with([
            'leftmenu' => (new FunMenu)->leftmenu($this->user_id),
            'username' => $this->user_name
        ]);
    }
}