From ece781990d952be64d9cf9796848ee294342dda2 Mon Sep 17 00:00:00 2001
From: Patrick <patrick@peakinformatik.com>
Date: Sat, 20 Sep 2014 19:56:51 +0200
Subject: [PATCH] Changed former controller part

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 6-dispatching-to-a-class.md | 57 +++++++++++++++++++++++++++++++++++++
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+[<< previous](5-router.md) | [next >>](7-inversion-of-control.md)
+
+### Dispatching to a Class
+
+In this tutorial we won't implement [MVC (Model-View-Controller)](http://martinfowler.com/eaaCatalog/modelViewController.html). MVC can't be implemented properly in PHP anyway, at least not in the way it was originally conceived. So forget about MVC and instead let's worry about [separation of concerns](http://en.wikipedia.org/wiki/Separation_of_concerns).
+
+Instead of just calling everything a controller, let's give our names descriptive names that describe what the class actually does. In this case, we will just display content, so a fitting name would be `Presenter`. If the class does something else, we will name it accordingly.
+
+Create a new folder inside the `src/` folder with the name `HelloWorld`. This will be where all your hello world related code will end up in. In there, create `HelloWorldPresenter.php`.
+
+```php
+<?php
+
+namespace Example\HelloWorld;
+
+class HelloWorldPresenter
+{
+    public function helloWorld()
+    {
+        echo 'Hello World';
+    }
+}
+```
+
+The autoloader will only work if the namespace of a class matches the file path and the file name equals the class name. At the beginning I defined `Example` as the root namespace of the application so this is referring to the `src/` folder.
+
+Now let's change the hello world route so that it calls your new class method instead of the closure. Change your `Routes.php` to this:
+
+```php
+return [
+    ['GET', '/hello-world', [
+        'Example\HelloWorld\HelloWorldPresenter', 
+        'helloWorld',
+    ]],
+];
+```
+
+Instead of just a callable you are now passing an array. The first value is the fully namespaced classname, the second one the method name that you want to call.
+
+To make this work, you will also have to do a small refactor to the routing part of the `Bootstrap.php`:
+
+```php
+case \FastRoute\Dispatcher::FOUND:
+    $className = $routeInfo[1][0];
+    $method = $routeInfo[1][1];
+    $vars = $routeInfo[2];
+    
+    $class = new $className;
+    $class->$method($vars);
+    break;
+```
+
+So instead of just calling a method you are now instantiating an object and then calling the method on it.
+
+Now if you visit `http://localhost:8000/hello-world` everything should work. If not, go back and debug. And of course don't forget to commit your changes.
+
+[<< previous](5-router.md) | [next >>](7-inversion-of-control.md)
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