统计 Laravel 应用中的活跃缓存会话数

<?php

namespace App\Http\Middleware;

use Closure;
use Auth;
use Cache;
use Carbon\Carbon;

class LastUserActivity
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        if (Auth::check()) {
            $expiresAt = Carbon::now()->addMinutes(1);
            Cache::put('user-is-online-' . Auth::user()->id, true, $expiresAt);
        }
        return $next($request);
    }
}

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use DB;
use Cache;

class UserController extends Controller
{
    /**
     * Show number of online users.
     *
     */
    public function numberOfOnlineUsers()
    {
        $users = DB::table('users')->get();
        $counter = 0;
        foreach ($users as $user) {
            if (Cache::has('user-is-online-' . $user->id)) {
                $counter++;
            }
        }

        //Passing $counter to the view
        return view("your_blade_file_name", ['counter' => $counter]);
    }
}

<p>The number of online users are: {{ $counter }}</p>

Route::get('/online-users', 'UserController@numberOfOnlineUsers');