如何在Laravel中实现一字符串两列查询

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class User extends Model
{
    protected $table = 'users';
}

<?php

namespace App\Http\Controllers;

use App\User;
use Illuminate\Http\Request;

class UserController extends Controller
{
    public function search(Request $request)
    {
        $searchString = $request->input('search');

        $users = User::where('name', $searchString)
                     ->orWhere('email', $searchString)
                     ->get();

        // 处理查询结果...
    }
}

Route::get('/search', 'UserController@search');