Creates an admin page with Admin Page Framework v3. This is an example plugin introduced in the tutorial, Create an Admin Page (http://en.michaeluno.jp/admin-page-framework/tutorials-v3/01-create-an-admin-page/).

tutorials-01-create-an-admin-page.php

<?php
/* 
    Plugin Name:    Admin Page Framework Tutorial 01 - Create an Admin Page 
    Plugin URI:     http://en.michaeluno.jp/admin-page-framework
    Description:    Creates an admin page with Admin Page Framework v3
    Author:         Michael Uno
    Author URI:     http://michaeluno.jp
    Version:        1.0.2
    Requirements:   PHP 5.2.4 or above, WordPress 3.4 or above. Admin Page Framework 3.0.0 or above
*/

include( dirname( __FILE__ ) . '/library/apf/admin-page-framework.php' );
    
// Extend the class
class APF_CreatePage extends AdminPageFramework {
    
    /**
     * The set-up method which is triggered automatically with the 'wp_loaded' hook.
     * 
     * Here we define the setup() method to set how many pages, page titles and icons etc.
     */
    public function setUp() {
       
        // Create the root menu - specifies to which parent menu to add.
        $this->setRootMenuPage( 'Settings' );  

        // Add the sub menus and the pages.
        $this->addSubMenuItems(
            array(
                'title'     => '1. My First Setting Page',  // page and menu title
                'page_slug' => 'my_first_settings_page'     // page slug
            )
        );

    }

    /**
     * One of the pre-defined methods which is triggered when the page contents is going to be rendered.
     * 
     * Notice that the name of the method is 'do_' + the page slug.
     * So the slug should not contain characters which cannot be used in function names such as dots and hyphens.
     */    
    public function do_my_first_settings_page() {   

        ?>
        <h3>Action Hook</h3>
        <p>This is inserted by the 'do_' + page slug method.</p>
        <?php

    }

}
 
// Instantiate the class object.
new APF_CreatePage;

// That's it!! See, it's very short and easy, huh?