<?php
class Init {

    public function __construct() {
        $this->add_messages();
        $this->add_msg_from_instance();
    }


    public function add_messages() {
        $this->messages = new Message_Handler();
        $this->messages->add_message( 'hello world' );
    }

    // I Would like to add a message from within this instance....
    public function add_msg_from_instance() {
        $example = new Example();
        $example->fire_instance();
    }

    public function run() {
        $this->messages->display_messages();
    }

}
class Message_Handler {

    public function __construct() {
        $this->messages = array();
    }

    public function add_message( $msg ) {
        $this->messages = $this->add( $this->messages, $msg );
    }

    private function add( $messages, $msg ) {
        $messages[] = $msg;
        return $messages;
    }


    // Final Function - Should display array of all messages
    public function display_messages() {
        var_dump( $this->messages );
    }

}
class Example {
    public function __construct() {
        $this->messages = new Message_Handler();
        $this->messages->add_message( 'Hello Universe!' ); // This message is NOT being displayed...
        $this->messages->display_messages();
    }
}
$test = new Example();