What namespace do I use to load a composer class in CodeIgniter? - php

Question

I am writing a composer package that I want to use in multiple CodeIgniter projects. Answers to that question can explain how to modify both package and application.
The package
I created a composer package called steevedroz/codeigniter-twig. Its composer.json looks like this:
{
"name": "steevedroz/codeigniter-twig",
"type": "library",
"description": "A simple CodeIgniter library that allows using Twig along with the usual CI helpers",
"keywords": ["codeigniter", "twig"],
"homepage": "https://gitlab.com/SteeveDroz/codeigniter-twig",
"license": "MIT",
"authors": [{
"name": "SteeveDroz",
"role": "Developer"
}],
"require": {
"php": ">=7.0",
"twig/twig": "^2.5"
},
"autoload": {
"psr-4": {
"CodeigniterTwig\\": "/"
}
}
}
It contains a main class that I'd like to load from CodeIgniter, located at the root of the package. It's called Twig.php and contains:
<?php
namespace CodeigniterTwig;
class Twig {
// ...
}
The CodeIgniter project
My POC project is a basic CodeIgniter project with a composer.json file at the root (next to application/, system/, etc.) that contains:
{
"require": {
"steevedroz/codeigniter-twig": "dev-master"
}
}
I ran composer install that loaded my package correctly.
In application/config.php, I set:
$config['composer_autoload'] = '/vendor/autoload.php';
I one of my controllers, I'd like to load my Twig class as a library like this:
$this->load->library('CodeigniterTwig/twig');
But when I check the result, I get the error:
Unable to load the requested class: Twig
I tried with different namespaces (see below), but the result is always the same!
steevedroz/CodeigniterTwig/twig
CodeigniterTwig/twig
twig
steevedroz/codeigniter-twig/twig
I guess the problem has to do with namespaces.
Any clue?