例如文件在： app/Common/functions.php
找到app/bootstrap/autoload.php 文件在下面增加一行：
<?php
define('LARAVEL_START', microtime(true));
/*
|--------------------------------------------------------------------------
| Register The Composer Auto Loader
|--------------------------------------------------------------------------
|
| Composer provides a convenient, automatically generated class loader
| for our application. We just need to utilize it! We'll require it
| into the script here so we do not have to manually load any of
| our application's PHP classes. It just feels great to relax.
|
*/
require __DIR__.'/../vendor/autoload.php';
require __DIR__.'/../app/Common/functions.php'; // 新增加的文件