你可以使用中间件来检查在线用户

if(Auth::check()) {
    $expiresAt = Carbon::now()->addMinutes(5);
    Cache::put('user-is-online-' . Auth::user()->id, true, $expiresAt);
}

检查用户：

public function isOnline()
{
    return Cache::has('user-is-online-' . $this->id);
}

鉴于：

@if($user->isOnline())
    user is online!!
@endif

也许这篇文章可以帮助你：https://erikbelusic.com/tracking-if-a-user-is-online-in-laravel/

<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Contracts\Auth\Factory as Auth;

class LastActivityUser
 {
     /**
     * The authentication factory instance.
     *
     * @var \Illuminate\Contracts\Auth\Factory
     */
     protected $auth;

     /**
     * Create a new middleware instance.
     *
     * @param  \Illuminate\Contracts\Auth\Factory  $auth
     * @return void
     */
     public function __construct(Auth $auth)
     {
         $this->auth = $auth;
     }
     /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
         if ($this->auth->check() && $this->auth->user()->last_activity < Carbon::now()->subMinutes(5)->format('Y-m-d H:i:s')) {
             $user = $this->auth->user();
             $user->last_activity = new \DateTime;
             $user->timestamps = false;
             $user->save();
        }
        return $next($request);
    }
}

你可以使用下面的软件包来获取在线用户的列表或确定用户是否在线。
https://github.com/shetabit/visitor

1.创建中间件ActivityByUser 2）在ActivityByUser中间件中
class ActivityByUser { public function handle（$request，Closure $next）{ if（Auth：：check（））{ $expiresAt = Carbon：：now（）->addMinutes（1）;//保持在线1分钟Cache：：put（'user-is-online-' . auth.js（）->id，true，$expiresAt）;// last seen User：：where（'id '，Auth：：user（）->id）->update（['last_seen' =>（new \DateTime（））->format（“Y-m-d H：i：s”）]）;} return $next（$request）;{\fnSimHei\bord1\shad1\pos（200，288）}
3）在Kernel.php中。

protected $middlewareGroups = [
'web' => [
    \App\Http\Middleware\EncryptCookies::class,
    \Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse::class,
    \Illuminate\Session\Middleware\StartSession::class,
    // \Illuminate\Session\Middleware\AuthenticateSession::class,
    \Illuminate\View\Middleware\ShareErrorsFromSession::class,
    \App\Http\Middleware\VerifyCsrfToken::class,
    \Illuminate\Routing\Middleware\SubstituteBindings::class,
    \App\Http\Middleware\ActivityByUser::class,
],
'api' => [
    'throttle:60,1',
    \Illuminate\Routing\Middleware\SubstituteBindings::class,
],

4)创建控制器：

public function userOnlineStatus()
{
    $users = User::all();
    foreach ($users as $user) {
        if (Cache::has('user-is-online-' . $user->id))
            echo $user->name . " is online. Last seen: " . Carbon::parse($user->last_seen)->diffForHumans();
        else
            echo $user->name . " is offline. Last seen: " . Carbon::parse($user->last_seen)->diffForHumans();
    }
}

5)检查刀片文件中的联机状态

@if(Cache::has('user-is-online-' . $user->id))
<span class="text-success">Online</span>
@else
<span class="text-secondary">Offline</span>
@endif