<?php

// Try with Traits

trait HelpManagerTrait {

        protected $entries;

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

        # DO NOT CALL
        protected function _addEntry($entry) {
                $this->entries[] = $entry;
        }

        public function printHelp() {
                print_r($this->entries);
        }

}

class HelpManager {
        use HelpManagerTrait;

}

class XYZ {

        protected $helpMan;

        public function __construct() {
                $this->helpMan = new HelpManager();
        }

        public function getHelpMan() {
                return $this->helpMan;
        }

        public function add($entry) {
                $test = $this->helpMan;
                $test = (HelpManagerTrait)$test;
                $test->_addEntry($entry);
        }

}

$xyz = new XYZ();
$xyz->add('test');
$xyz->getHelpMan()->printHelp();
$xyz->getHelpMan()->_addEntry('illegal');
$xyz->getHelpMan()->printHelp();