Class not being found with PSR-4 and Composer

Question

I'm trying to understand how to use PSR-4 with Composer. I have 3 folders in my project: folder, folder2 and `vendor. Outside all these folders there's four files: index.php, composer.phar, composer.json and X.php. Some of these files are descibed below:

index.php

require_once 'vendor/autoload.php';

use \folder\in\A;
use \folder\in\B;
use \folder\C;
use \folder2\D;

$a = new A();
$b = new B();
$c = new C();
$d = new D();
$x = new X();

X.php

<?php

class X {
        public function __construct() {
            echo "Classe X";
        }
}

composer.json

{
    "autoload":{
        "psr-4": {
            "folder\\": "folder/",
            "folder2\\": "folder2/"
        }
    }
}

The index.php file is working well for the files that are in folder and folder2, but the X.php is not being found. What's the problem? How I can found the X.php file in index.php using Composer and PSR-4? I can found the X.php file using require_once, though, but I want to know how to this with Composer and PSR-4.

Possible duplicate of How does PSR-4 autoloading work in composer for custom libraries? — Magnus Eriksson
What namespace I should use in class X? This class is outside all other folders. — Vinicius
If you want to structure your code properly, no classes should be up in the root. What namespace and/or folder depends on what the class actually does. — Magnus Eriksson

Dale Dale · Accepted Answer · 2017-06-18T14:06:34

You could use the autoload : files facility that comes with composer

https://getcomposer.org/doc/04-schema.md#files

{
    "autoload": {
        "files": ["X.php"]
    }
}

Personally I like to use this to load my own autoloader, so that I don't have to keep on adding files to composer.json (I'm just weird like that)

{
    "autoload": {
        "files": ["customLoader.php"]
    }
}

And my customLoader.php may be along the lines of

<?php

$files = ['X.php', 'Z.php']; // etc
foreach($files as $file) {
    require_once($file);
}

Class not being found with PSR-4 and Composer

2 Answers