Composer doesn't load classes specified in autoload, why?

Question

Composer

index.php

require_once '../vendor/autoload.php';
$router = components\Router::getInstance();

router

namespace components;
use controllers;

class Router {
....
public function init($routes) {
.....
 $obj = new $controller_name;  // HomeController
 $result = call_user_func($obj->$controller[1]); // index
.....

composer.json
After adding psr was:
composer dumpautoload -o
and
composer dumpautoload

"autoload": {
        "psr-0": {
            "components\\": "components/",
            "controllers\\": "controllers/",
            "models\\": "models/"
        }
    }

Structure:
./components
./controllers
./models
./web/
./web/index.php
Error:
Fatal error: Class 'HomeController' not found

Answer 1

Fatal error: Class 'HomeController' not found

you have 'HomeController' in your controller_name variable without a namespace, and I can assume that you actually have it in your controllers namespace. In this case, the composer has nothing to do with it.