Wordpress MVC - Main Class sample

doc.mainclass1.php

<?php
// @link http://wordpress-dev.evopiru.com/documentation/main-class/
class Main extends Theme
{
    public function init()
    {
        // Adding filter with callback function within Main Class
        add_filter( 'the_content', [ &$this, 'filter_content' ] );

        // Adding filter with callback located in a controller. Controller: PostController Method: filter_content()
        $this->add_filter( 'the_content', 'PostController@filter_content' );

        // Adding shortcode [hello] generated by view located at 'views/shout/hello.php'
        $this->add_shortcode( 'hello', 'view@shout.hello' );
    }
}