class MyPlugin {

	function __construct() {
		add_shortcode('ShowMsg', [$this,'ShowMsg']);

		//add_action( 'admin_menu', [$this,'load_starter_tab'] );
		add_action( 'admin_menu',
			function () {
				add_menu_page( 'Publications Upload', 'Publications Upload',
				 'manage_options', 'ha_pubs_load', [$this,'load_starter']);
			} );
	}

	function ShowMsg($atts) {
		$data = shortcode_atts(array('phn' => '', 'msg' => ''), $atts);
		return 'You sent '.$data['msg'] .' from '.$data['phn'] ;
	}

	/* not necessary see construct */
	function make_shortcode() {
		add_shortcode('ShowMsg', [$this,'ShowMsg']);
	}

	/* not necessary see construct */
	function add_form() {
		add_action( 'admin_menu', [$this,'load_starter_tab'] );
	}


	/* see alternate usage with anonymous function*/
	function load_starter_tab() {
		add_menu_page( 'Publications Upload', 'Publications Upload', 'manage_options', 'ha_pubs_load', [$this,'load_starter']);
	}

	function load_starter() {
		?><h1>HERE YOU ARE!</h1>
		<?php
	}

}


new MyPlugin;