Question

$object_cin = new CIO( ); 
$object_cin->invoke( $_POST[ 'model' ] );

class CIO
{
    private function invoke( $model )
    {
        switch( $model ) 
        {
            case 'user_try':
                $model = new MUserTry();  
                $this->send( $model->invoke( 1 ) );
                break;
            case 'user_new':
                $model = new MUserNew( new IUniversals() , new IText(), new IMessage() ); 
                $this->send( $model->invoke() );
                break;
            case 'user_exist':
                $model = new MUserExist( new IUniversals() , new IText(), new IMessage() );  
                $this->send( $model->invoke() );
                break;
            case 'tweet':
                $model = new MTweet( new IUniversals() , new IText(), new IMessage() );
                $this->send( $model->invoke() );
                break; 
            default:
                echo "Incorrect Ajax Type provided";
        }
    }
    private function send( $string )
    {
        echo "|P|" . $string;
    }
}

Answer 1

Of course it will grow, and become impossible to maintain.

First of all, what is with the generic Control class? A website is supposed to have multiple controllers (I am assuming that it is somehow related to MVC, because that’s where the term “controller” comes from), usually 1 controller per one “page” (granularity may change, depending on architectural pattern).

Next problem is the big switch statement. Each of the case‘s there should be a separate method in a controller. You end up repeating parts of code, just because of the design mistake.