Composer Autoload psr-4 issue

Question

i'm a newbie at composer, so just bear with me, So i have a package, which i'm loading from local folder, and while using it, i get the following error:

Fatal error: Class 'mypkg\Layer\EasyCPT' not found in C:\xampp\htdocs\testwp\app\Cpt\location.php on line 5

My Composer.json:

"repositories": [
    {
        "type":"vcs",
        "url":"C:/xampp/htdocs/mypkg"
    }
],
"require": {
    "php": ">=7.0.0",
    "mypkg/particles": "master"
},
"autoload": {
    "psr-4": {
       "App\\": "app/"
    }
}

Package's Composer:

"minimum-stability": "dev",
"authors": [
    {
        "name": "Talha Abrar",
        "email": "[email protected]"
    }
],
"autoload": {
    "psr-4": {
       "Mypkg\\": "particles/"
    }
}

Psr 4:

$vendorDir = dirname(dirname(__FILE__));
$baseDir = dirname($vendorDir);

return array(
    'Mypkg\\' => array($vendorDir . '/Mypkg/particles/particles'),
    'App\\' => array($baseDir . '/app'),
);

how i am using it:

<?php 

namespace App\Cpt;
use Mypkg\Layer\EasyCPT;

class Location extends EasyCPT{
    protected $plural = 'locations';
}

Main auto-loading file:

require __DIR__.'/vendor/autoload.php';

use App\Init\EasyWP;

    new EasyWP();

kenorb kenorb · Accepted Answer · 2017-11-30T13:41:36

You use the namespace as:

use Particles\Layer\EasyCPT;

but in autoload section defining as:

"Mypkg\\": "particles/"

which is not consistent.

You should replace Mypkg with the right namespace name, e.g.

"autoload": {
    "psr-4": {
       "Particles\\": "particles/"
    }
}

So requesting Particles\Layer\EasyCPT namespace will look for class in particles/Layer/EasyCPT.php file.

As per Composer's PSR-4 documentation:

Under the psr-4 key you define a mapping from namespaces to paths, relative to the package root. When autoloading a class like Foo\\Bar\\Baz a namespace prefix Foo\\ pointing to a directory src/ means that the autoloader will look for a file named src/Bar/Baz.php and include it if present. Note that as opposed to the older PSR-0 style, the prefix (Foo\\) is not present in the file path.

If your project doesn't follow PSR-4 approach, use classmap instead to scan for all of your classes, e.g.

"autoload": {
    "classmap": ["particles/"],
    "exclude-from-classmap": ["/tests/"]
}

To regenerate autoload manually, run:

composer dump-autoload -o

and check autoload files in vendor/composer/ whether the references to classes were generated correctly.

Composer Autoload psr-4 issue

1 Answers