How does psr-4 download work?

Question

PHP

Hello. In composer.json

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

Project structure

Trying to access the index class app/kontrollers/index.php

require_once '../vendor/autoload.php';
$index = new \App\Kontrollers\index();
$index->in();

I get an error

Fatal error: Class 'App\Kontrollers\index' not found in /home/v-smerti/projekt/star_labs/api/public/index.php on line 5

Index class code

namespace \App\Kontrollers\index;
class index {
    public function in() {
        echo'0789078907890';  
    }
}

What did I do wrong? Thanks in advance.

Answer 1

1. namespace App\Kontrollers;
2. composer update -a