Give your plugin functionality by adding methods to your main plugin class and attaching them as callbacks to WordPress hooks.

plugin-dir/classes/Plugin.php

In addition to the traditional add_action() and add_filter() methods of assigning your functionality to WordPress, you can also just use an annotation in the doc-block of your class method to do the same job.

class Plugin
{
    /**
     * @MWP\WordPress\Action( for="init" )
     */
    public function bootMeUp() {

    }
}

It’s much clearer as to what the method is a callback for, and there is no need for decoupled add_action() or add_filter() declarations in a class constructor.

When you’re ready, there are many more annotations you can use to quickly tie in your functionality to WordPress automatically.