Matt Stephens Matt Stephens - 4 months ago 13
PHP Question

PSR4 Composer Autloading namespaces

I've been having a little play around with some

Composer
autoloading and i'm getting some issues so the directory structure is

index.php
app/
helpers/
router.php
vendor/
composer/
/*usual files*/
autoload.php


Inside my
composer.json
I have the following

"autoload": {
"psr-4": {
"App\\": "app/"
}
}


Inside my
index.php
I have

<?php
// Autoload our namespaces
require __DIR__.'/vendor/autoload.php';

use App\Helpers\Router;
$route = new Router;


Getting the following error

Fatal error: Class 'App\Helpers\Router' not found in /var/www/public/index.php on line 6


I have tried a few different things to try and get it working but i'm unsure where i'm going wrong. This is my first time looking into autoloading using Composer outside of a framework so would appreciate any guidance.

Answer

PSR-4 is case sensitive. The structure has to be app/Helpers/Router.php or better App with capital A.

All class names MUST be referenced in a case-sensitive fashion.

The subdirectory name MUST match the case of the sub-namespace names.

The terminating class name corresponds to a file name ending in .php. The file name MUST match the case of the terminating class name.

http://www.php-fig.org/psr/psr-4/