昨天我在服务器上部署了我的Laravel应用程序，一切正常。今天早上我醒来，应用程序不再正常工作，当我试图访问网站时，我能看到的只是以下文本：

<?php

    /**
     * Laravel - A PHP Framework For Web Artisans
     *
     * @package  Laravel
     * @author   Taylor Otwell <taylor@laravel.com>
     */

    define('LARAVEL_START', microtime(true));

    /*
    |--------------------------------------------------------------------------
    | Register The Auto Loader
    |--------------------------------------------------------------------------
    |
    | Composer provides a convenient, automatically generated class loader for
    | our application. We just need to utilize it! We'll simply require it
    | into the script here so that we don't have to worry about manual
    | loading any of our classes later on. It feels great to relax.
    |
    */

    require __DIR__.'/../vendor/autoload.php';

    /*
    |--------------------------------------------------------------------------
    | Turn On The Lights
    |--------------------------------------------------------------------------
    |
    | We need to illuminate PHP development, so let us turn on the lights.
    | This bootstraps the framework and gets it ready for use, then it
    | will load up this application so that we can run it and send
    | the responses back to the browser and delight our users.
    |
    */

    $app = require_once __DIR__.'/../bootstrap/app.php';

    /*
    |--------------------------------------------------------------------------
    | Run The Application
    |--------------------------------------------------------------------------
    |
    | Once we have the application, we can handle the incoming request
    | through the kernel, and send the associated response back to
    | the client's browser allowing them to enjoy the creative
    | and wonderful application we have prepared for them.
    |
    */

    $kernel = $app->make(Illuminate\Contracts\Http\Kernel::class);

    $response = $kernel->handle(
        $request = Illuminate\Http\Request::capture()
    );

    $response->send();

    $kernel->terminate($request, $response);

我没有对应用程序或服务器进行任何更改。有人知道是怎么回事，可以为我指出正确的方向吗？