👀 Views: 66 💬 Answers: 1 📅 Created: 2025-06-12

php composer autoload PHP

I'm attempting to set up Could someone explain I'm collaborating on a project where I'm having trouble with Composer autoloading when trying to include namespaced classes in my PHP project... I'm using PHP 8.1 and Composer version 2.1. It's a basic structure where I'm trying to create an instance of a class that resides in a subdirectory. Here's my directory structure: ``` my_project/ ├── src/ │ └── MyNamespace/ │ └── MyClass.php ├── vendor/ └── composer.json ``` My `composer.json` file is set up like this: ```json { "autoload": { "psr-4": { "MyNamespace\\": "src/MyNamespace/" } } } ``` In `MyClass.php`, I have the following code: ```php <?php namespace MyNamespace; class MyClass { public function greet() { return 'Hello, world!'; } } ``` However, when I try to use it in another PHP file like this: ```php <?php require 'vendor/autoload.php'; use MyNamespace\MyClass; $instance = new MyClass(); echo $instance->greet(); ``` I get the following behavior message: ``` Fatal behavior: Uncaught behavior: Class 'MyNamespace\MyClass' not found in /path/to/your/file.php:4 ``` I've run `composer dump-autoload` multiple times, and I've also checked the file permissions to ensure that the scripts can be accessed. Additionally, I verified that the namespace declaration in `MyClass.php` matches the one I'm using when instantiating the class. The directory structure and the Composer configuration appear to be correct. What could be causing this scenario? What's the best practice here? What would be the recommended way to handle this? I'm working with Php in a Docker container on Linux. What am I doing wrong? I'm using Php 3.11 in this project.