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copied!<p>The idea of a service manager is you have the ability to replace the form at runtime. It is all about decoupling and reusability.</p> <p>Let's say you have a module <code>Foo</code> and there is a form <code>Foo\Form\Something</code>. Then you put the <code>Foo</code> module in another application, but you need to switch the form for something else. If you just did <code>$form = new Foo\Form\Something</code> in your controller, you have no simple option to instantiate another form. If you register the form under <code>foo_form_something</code>, the <code>Bar</code> module can then overwrite the service. So <code>foo_form_something</code> does not load <code>Foo\Form\Something</code> but <code>Bar\Form\Something</code>. And there is no change required in the controller.</p> <p>There is another related coding style, where you inject the form in your controller instead of pulling it via the service manager. You perhaps use this:</p> <pre><code>namespace MyModule\Controller; class MyController { public function myAction() { $form = $this->getServiceLocator()->get('foo_form_something'); } } </code></pre> <p>But this makes testing of your controllers much harder. It is easier to inject the dependency:</p> <pre><code>namespace MyModule\Controller; use Foo\Form\Something as SomethingForm; class MyController { protected $form; public function __construct(SomethingForm $foo) { $this->form = $foo } public function myAction() { $form = $this->form; } } </code></pre> <p>And you inject the form in the controller configuration:</p> <pre><code>namespace MyModule; class Module { public function getControllerConfig() { return array( 'factories' => array( 'MyModule\Controller\MyController' => function($sm) { $form = $sm->getServiceLocator()->get('foo_form_something'); $controller = new MyModule\Controller\MyController($form); return $controller; } ), ); } } </code></pre>

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