Creates a page group with Admin Page Framework v3. This is an example plugin introduced in the tutorial, Create a Page Group (http://en.michaeluno.jp/admin-page-framework/tutorials-v3/03-create-a-page-group/).

tutorials-03-create-a-page-group.php

<?php
/* 
	Plugin Name: Admin Page Framework Tutorial 03 - Create a Page Group
	Plugin URI: http://en.michaeluno.jp/admin-page-framework
	Description: Creates a page group with Admin Page Framework v3
	Author: Michael Uno
	Author URI: http://michaeluno.jp
	Version: 1.0.1
	Requirements: PHP 5.2.4 or above, WordPress 3. or above. Admin Page Framework 3.0.0 or above
*/

include( dirname( __FILE__ ) . '/library/apf/admin-page-framework.php' );

// Extend the class
class APF_CreatePageGroup extends AdminPageFramework {
	
    // Define the setUp() method to set how many pages, page titles and icons etc.
    public function setUp() {
                   
        // Create the root menu
        $this->setRootMenuPage(
            '3. My Page Group',    // specify the name of the page group
            'https://lh5.googleusercontent.com/-vr0hu0pHcYo/UilDa_OwGYI/AAAAAAAABRg/29eid1MIBW0/s16/demo03_01_32x32.png'    // use 16 by 16 image for the menu icon.
        );   
                           
        // Add the sub menus and the pages.
        // The third parameter accepts screen icon url that appears at the top of the page.
        $this->addSubMenuItems(   
		    array(
		    	'title' => 'First Page',        // page title
		    	'page_slug' => 'my_first_page',    // page slug
		    	'screen_icon' => 'https://lh5.googleusercontent.com/-vr0hu0pHcYo/UilDa_OwGYI/AAAAAAAABRg/29eid1MIBW0/s800/demo03_01_32x32.png'     // page screen icon for WP 3.7.x or below
		    ),
		    array(
		    	'title' => 'Second Page',        // page title
		    	'page_slug' => 'my_second_page',    // page slug
		    	'screen_icon' => 'https://lh5.googleusercontent.com/-vr0hu0pHcYo/UilDa_OwGYI/AAAAAAAABRg/29eid1MIBW0/s800/demo03_01_32x32.png'     // page screen icon for WP 3.7.x or below
		    ),
		    array(
		    	'title' => 'Third Page',        // page title
		    	'page_slug' => 'my_third_page',    // page slug
		    	'screen_icon' => 'https://lh5.googleusercontent.com/-vr0hu0pHcYo/UilDa_OwGYI/AAAAAAAABRg/29eid1MIBW0/s800/demo03_01_32x32.png'     // page screen icon for WP 3.7.x or below
		    ),
		    array(
		    	'title'	=>	__( 'Documentation', 'admin-page-framework-demo' ),
		    	'href'	=>	'http://admin-page-framework.michaeluno.jp/en/v3/',
		    	'show_page_heading_tab'	=>	false,
		    )			
        );   
        // You can add more pages as many as you want!
        
    }
   
    // Action hook methods: 'do_' + page slug.
    public function do_my_first_page() {   
        ?>
        <h3>Action Hook Method</h3>
        <p>This is the first page from the action hook!</p>
        <?php
    }
    public function do_my_second_page() {   
        ?>
        <h3>Action Hook Method</h3>
        <p>This is the second page from the action hook!</p>
        <?php
    }
    public function do_my_third_page() {   
        ?>
        <h3>Action Hook Method</h3>
        <p>This is the third page from the action hook!</p>
        <?php
    }
   
    /**
     * Let's try using methods for filters. For filters, the method must return the output.
     * The method name is content_ + page slug, similar to the above methods for action hooks.
     */
    public function content_my_first_page( $sContent ) {   
        return $sContent . '<h3>Filter Hook Method</h3><p>This is the first page from the filter! ( content_ + pageslug )</p>';
    }
    public function content_my_second_page( $sContent ) {   
        return $sContent . '<h3>Filter Hook Method</h3><p>This is the second page from the filter! ( content_ + pageslug )</p>';
    }
    public function content_my_third_page( $sContent ) {   
        return $sContent . '<h3>Filter Hook Method</h3><p>This is the third page from the filter! ( content_ + pageslug )</p>';
    }       
   
    // There are more available filters and actions! Please refer to Demo 06 - Hooks.
}

// Instantiate the class object.
new APF_CreatePageGroup;
	
// That's it!! See, it's very short and easy, huh?