Amazon EB 在自动加载我的 PSR-4 命名空间类时遇到问题

Question

I wanted to add PSR-4 namespacing for my classes:

- app
-- autoloader.php
-- bootstrap.php -> `include 'autoloader.php'`
- public
-- index.php -> `include './../app/bootstrap.php'`
- controllers
-- Test.php

controllers/Test.php:

<?php

namespace Controllers;

class Test{}

app/autoloader.php (simplified):

<?php
spl_autoload_register('myAutoloader');

function myAutoloader($className) {
    include "./../$classname.php"
}

Then at some point I call Controllers\\Test::someMethod() .

Locally , this loads fine. But when I deploy it to my AWS EB instance , it fails. So I ran tests to narrow it down to this:

var_dump(file_exists('./../controllers/Test.php')); // local: bool(true), AWS: bool(true)
var_dump(file_exists('./../Controllers/Test.php')); // local: bool(true), AWS: bool(false)***

On the AWS EB instance, the filename with the capitalized Controllers cannot be found, but the lowercased controllers can.

How can I configure my EB instance to allow for mixed capitalization?

Answer 1

Did some further digging and found that the issue is the Elastic Beanstalk instance is running on Linux. My local environment is a Mac.

file_exists() and include|require() are case-insensitive on Mac and Windows, but it is case-sensitive on a Linux.

So in order to autoload classes without the aid of a library or framework abstraction, I needed to capitalize my directories. Unfortunately, I wouldn't be able to do any of the fancier PSR-4 standards:

\Acme\Log\Writer\File_Writer => ./acme-log-writer/lib/File_Writer.php

...but I'm sure there are libraries out there that can convert a $className to a PSR4 filepath. In the meantime, I'll stick to capitalizing my namespace-directories.