jucai/app/Http/Middleware/SubSite.php

<?php

namespace App\Http\Middleware;

use Closure;

class SubSite
{

    /**
     * OfficialCheck constructor.
     */
    public function __construct()
    {
    }


    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request $request
     * @param  \Closure $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        if (get_subsite_id() > 0) {
            view()->share('sub_site', 'jkq.');
        } else {
            view()->share('sub_site', '');
        }

        return $next($request);
    }
}