neiyou_user_web/app/Http/Middleware/isAdmin.php

<?php

namespace App\Http\Middleware;

use Auth;
use Closure;
use Illuminate\Http\Request;
use Redirect;

class isAdmin
{
	/**
	 * 校验是否为管理员身份
	 *
	 * @param Request $request
	 * @param Closure                  $next
	 *
	 * @return mixed
	 */
	public function handle($request, Closure $next)
	{
		if(!Auth::user()->is_admin){
			return Redirect::to('/');
		}

		return $next($request);
	}
}