Autoload controllers using namespace

Question

I’m trying to give a restructured in a personal microframework, before not used much standard in the structure of the project, now I played all my back-end in the folder source, and I’m using namespaces to separate the code. I’m having trouble doing the autoload, want to give a new Crontrolador() without first having to use the use \Controllers\Controlador.

I never really understood that part so I came to ask for help, currently in my class Core I have the following method which is responsible for making some validations and calling the controller:

private function addControllerAndModel($class, $method, $page = false)
{
    $class = ucfirst($class);
    $controller = "{$class}Controller";

    if(file_exists(__DIR__."/../../Controllers/{$controller}.php")) {

        echo "Controller existe<br>";
        if($page)
            $this->importRels(Relationships::get('*'));

        $this->importRels(Relationships::get($class));

        $instance = new $controller();

        if($page) {
            if(count($_POST)) {
                if($_POST['token'] === Session::get('token') or in_array($_POST['token'], Settings::get('allowsAjax'))) {
                    Session::set('token', false);
                    Saved::create();
                    $method = "{$method}Posted";
                }
                else {
                    Errors::display('Token inválido', DOMAIN);
                    exit();
                }

            }
            else {
                if(!Session::get('token'))
                    Session::set('token', md5(crypt(time(), '$1$rasmusle$')));
                $method = "{$method}Deed";
            }
        }


            $instance->{$method}();
       // else
            //Errors::display("Método não encontrado [{$controller}/{$method}]");
    }
    //else
        //Errors::display("Controlador não encontrado [{$controller}]");

    echo $this->controller . " / " . $this->method;
}

Briefly, I see if there is the requested controller file, if there is I import the Models related to that controller, and then I prompt the controller, after that I have some security controls, and finally I call the desired method.

Currently error on line 126 ($instance = new $controller();):

Fatal error: Uncaught Error: Class 'Homecontroller' not found in /home/Leonardo/www/tcc/newframework/source/Kernel/Kernel/Core.php:126

Follow the folder structure of my project:

Project

--binary
--public
----js
----css
----librarys
----views
--source
----Controllers
------MeuControlador.php
----Kernel
------Kernel
--------Core.php
----Models
------MeuModel.php
--settings
--third
--trials

The mentioned function is present in Core.php, and the controllers are two levels behind and in the Controllers folder. I do not understand how to make such autoloader with namespaces, so the only attempt I have is this method above.

An example of a controller:

<?php
/**
 * Created by PhpStorm.
 * User: leonardo
 * Date: 17/09/16
 * Time: 14:52
 */

namespace Controllers;

class HomeController extends Kernel\Control\Controller
{
    public function startDeed()
    {
        echo "Hello World!!";
    }

}

It is possible to give new HomeController() undeclared use Controllers\HomeController? I tried using:

$instance = \Controllers\{$controller}();

But it didn’t work :(

Answer 1

The problem is how you’re instantiated your class.

Do not mix the object declaration with strings, because it won’t work.

Instead, concatenate the class name with the namespace expected in a string:

<?php

namespace Legumes {

    class Batata {

    }

}

// volta para o namespace global
namespace {
    $classe = 'Batata';

    // Cuidado especial com a barra invertida, ela é utilizada como escape
    $fqn = "\\Legumes\\{$classe}";

    $instance = new $fqn;

    var_dump($instance);
}

Behold spinning.