Issue regarding to MVC pattern

[javaslave]

Hi folks,
I am building up few php pages for the sake of practising MVC pattern. I have few html forms on each page, when they are submitted, user inputs are validated and error message will be displayed if validation fails, otherwise dynamic data is extracted from database and displayed on page.

What i have done is storing all error messages/dynamic data into session, which is then made available for presentattion. My concern is that is perhaps not a wise way to do it cause the server's RAM will be quickly filled up, therefore, slowing down performance, if there are large amount of users sending requests at the same time. I would like to hear other people's idea. Any inputs are highly appreciated.

[Shrike]

What has this to do with MVC?

Do you mean that you store every possible error message in the session, or just the ones relevant to the current request? If it is the latter I don't really see the problem - just a few extra bytes in the session is not going to cause much of a memory problem.

[Shrike]

Having re-read your post I think you might be having issues getting data from the model layer to the view. The common approach for this is to inject variables into the view's context, one way or another. I'm not sure that the session is the best way for this, as it's not really persistent data.

class Model
{
  function helloWorld()
  {
    return "Hello world!";
  }
}

class HelloWorldController
{
  function execute()
  {
    $model = new Model;
    $view = new HelloWorldView;
    $hello = $model->helloWorld();
    $view->addVariable( 'hello', $hello );
    $view->render();
  }
}

class HelloWorldView
{
  var $variables;
  function addVariable( $key, $value )
  {
    $this->variables[ $key ] = $value;
  }
  function render()
  {
    echo $this->variables['hello'];
  }
}

$c = new HelloWorldController;
$c->execute();