basic wordpress class

<?php
/**
* @package myplugin1
*/
/*
Plugin Name: myplugin1
Plugin URI: xxx
Description: xxx
Domain Path: /lang
Version: 0.1
Author: xxx
Author URI: xxx
License: GPLv2 or later
*/
/*
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/
//No direct access
if( !function_exists( 'add_action' ) )
{
    header('Status: 403 Forbidden');
    header('HTTP/1.1 403 Forbidden');
    exit;
}
//PHP5 mandatory
if( version_compare( PHP_VERSION, '5.0.0', '<' ) )
{
    add_action( 'admin_notices', 'put_version_requirephp' );
    function put_version_requirephp() {
        if( current_user_can( 'manage_options' ) )
            echo '<div class="error"><p>This plugin requires at least PHP 5.</p></div>';
    }
    return;
}
//WP 3.3 mandatory (help screens)
if( version_compare( $wp_version, '3.3', '<' ) )
{
    add_action( 'admin_notices', 'put_version_requirewp' );
    function put_version_requirewp() {
        if( current_user_can( 'manage_options' ) )
            echo '<div class="error"><p>This plugin requires at least WP 3.3</p></div>';
    }
    return;
}

if ( ! class_exists('myplugin1') )
{
    class myplugin1
    {
        private $adminOptionsName = 'myplugin1AdminOptions'; //admin options variables
        private $myplugin1_table_version = '1.0'; // version of the table for the plugin
        private $pluginURL;
        private $textdom = 'myplugin1';//traduction prefix
        private $table1 = 'mytable1';
        private $table2 = 'mytable2';
        private $table3 = 'mytable3';
        private $screen_id;

        // For testing plugin locales
        public function switch_locale( $locale )
        {
            $locale = 'LOCALETEST'; // => lang/myplugin1-LOCALETEST.po
            return $locale;
        }

        /** Fonction d'initialisation du plugin
        *
        * @return
        */
        public function __construct()
        {
            if ( is_admin() )
            {
                $this->pluginURL = plugin_dir_url( __FILE__ );
                $this->register_hooks();
                add_action('admin_menu', array(&$this, 'myplugin1_adminmenu'));
                // add_filter( 'plugin_locale' , array( $this , 'switch_locale' ) ); // Use in TEST mode : Quick way to fake locale
            }
        }

        private function register_hooks()
        {
            if(function_exists('register_activation_hook'))
                register_activation_hook(__FILE__, array(&$this, 'on_activate'));

            if(function_exists('register_deactivation_hook'))
                register_deactivation_hook(__FILE__, array(&$this, 'on_deactivate'));

            // if(function_exists('register_uninstall_hook'))
                // register_uninstall_hook(__FILE__, array(&$this, 'on_uninstall'));
            //=> Error : must be static call
        }

        /** On plugin install
        *
        * @return void
        */
        public function on_activate()
        {
            $this->do_activate();
        }

        /** Db & options setup
        *
        * @return
        */
        private function do_activate()
        {
            $this->getAdminOptions();
            $this->myplugin1_update_db_check();
        }

        /** On plugin on_deactivation
        *
        * @return void
        */
        public function on_deactivate()
        {
            $this->do_deactivate();
        }

        /** Do nothing
        *
        * @return
        */
        private function do_deactivate()
        {
            return;
        }
        /** Delete multiple options
        * ex : deleteOptions('is_installed', 'my_plugin_version', 'my_option');
        * @return boolean
        */
        function deleteOptions()
        {
            $args = func_get_args();
            if (count($args) > 0)
            {
                foreach ($args as $option) {
                    if ( ! delete_option($option))
                        return FALSE;
                }
                return TRUE;
            }
            return FALSE;
        }
        /** On plugin uninstall
        *
        * @return
        */
        public function on_uninstall()
        {
            if ( __FILE__ != WP_UNINSTALL_PLUGIN )
                return;

            $this->do_uninstall();
        }

        /** Delete db && unregister options
        *
        * @return void
        */
        private function do_uninstall()
        {
            global $wpdb;
            //delete tables
            $tables = array(
                $wpdb->prefix.$this->table1,
                $wpdb->prefix.$this->table2,
                $wpdb->prefix.$this->table3);
            foreach($tables as $table)
            {
                if($wpdb->get_var("SHOW TABLES LIKE '$table'") == $table)
                {
                    $sql = "DROP TABLE `$table`";
                    $wpdb->query($sql);
                }
            }
            //delete options
            delete_option($this->adminOptionsName);
        }

        /** Administration default options
        *
        * @return
        */
        private function getAdminOptions()
        {
        //OptionList
            $ntAdminOptions = array(
                'myplugin1_table_version' => $this->myplugin1_table_version
            );
            $nt_options = get_option($this->adminOptionsName);
            if (!empty($nt_options))
            {
                foreach ($nt_options as $key => $option)
                    $ntAdminOptions[$key] = $option;
            }
            update_option($this->adminOptionsName, $ntAdminOptions);
            return $ntAdminOptions;
        }

        /** Tables creation
        *
        * @return
        */
        private function table_install()
        {
            global $wpdb;
            $charset_collate = '';
            if ( ! empty($wpdb->charset) )
                $charset_collate = "DEFAULT CHARACTER SET $wpdb->charset";
            if ( ! empty($wpdb->collate) )
                $charset_collate .= " COLLATE $wpdb->collate";

            $table1 = $wpdb->prefix.$this->table1;
            if($wpdb->get_var("SHOW TABLES LIKE '$table1'") != $table1)
            {
                $sql = "CREATE TABLE `$table1` (
                `id_track` mediumint(8) unsigned NOT NULL AUTO_INCREMENT,
                `id_abo_track` mediumint(8) unsigned NOT NULL,
                `mail_abo_track` varchar(255) NOT NULL,
                PRIMARY KEY (`id_track`)
                ) $charset_collate;";
                require_once(ABSPATH . 'wp-admin/includes/upgrade.php');
                dbDelta($sql);
            }
            $table2 = $wpdb->prefix.$this->table2;
            if($wpdb->get_var("SHOW TABLES LIKE '$table2'") != $table2)
            {
                $sql = "CREATE TABLE `$table2` (
                `id_ntl` mediumint(8) unsigned NOT NULL AUTO_INCREMENT,
                `nom_ntl` varchar(255) NOT NULL,
                `id_liste_ntl` mediumint(8) unsigned NOT NULL,
                PRIMARY KEY (`id_ntl`)
                ) $charset_collate;";
                require_once(ABSPATH . 'wp-admin/includes/upgrade.php');
                dbDelta($sql);
            }
            $table3 = $wpdb->prefix.$this->table3;
            if($wpdb->get_var("SHOW TABLES LIKE '$table3'") != $table3)
            {
                $sql = "CREATE TABLE `$table3` (
                `id_ntr` mediumint(8) unsigned NOT NULL AUTO_INCREMENT,
                `id_ntl_ntr` mediumint(8) unsigned NOT NULL COMMENT 'letter id',
                `lien_ntr` varchar(255) NOT NULL,
                `code_ntr` varchar(100) NOT NULL,
                PRIMARY KEY (`id_ntr`)
                ) $charset_collate;";
                require_once(ABSPATH . 'wp-admin/includes/upgrade.php');
                dbDelta($sql);
            }
            // plugin versioning
            add_option("myplugin1_table_version", $this->myplugin1_table_version);
        }

        /** Plugin table update checking
        *
        * @return
        */
        private function myplugin1_update_db_check()
        {
            if ( get_option('myplugin1_table_version') != $this->myplugin1_table_version )
            {
                $this->table_install();
            }
        }

        /** Administration menu
        *
        * @return
        */
        public function mainmenu()
        {
            echo '
            <div class="wrap"><div id="icon-options-general" class="icon32"><br></div>
            <h2>Main menu</h2>
            <p>Menu content</p>
            </div>';
        }

        public function mysubmenu()
        {
            echo '
            <div class="wrap"><div id="icon-options-general" class="icon32"><br></div>
            <h2>Submenu title</h2>
            <p>Submenu content</p>
            </div>';
            $screen = get_current_screen();
            $screen->add_help_tab( array(
                'id' => $this->screen_id,
                'title' => __('Submenu help'),
                'content' => __('Submenu help content'),
                ));
        }

        public function myplugin1_adminmenu()
        {
            $pluginpath = $this->pluginURL;
            if (function_exists('add_menu_page'))
            {
                $menu_page = add_menu_page(__('My main menu page title', $this->textdom), __('My main menu title', $this->textdom), 'manage_options', 'mainmenu', array(&$this, 'mainmenu'), $pluginpath.'images/menuicon.gif' );
            }
            if (function_exists('add_submenu_page'))
            {
                $submenu_page = add_submenu_page('mainmenu', __('My main submenu page title', $this->textdom), __('My main submenu title', $this->textdom), 'manage_options', 'mysubmenu', array(&$this, 'mysubmenu') );
            }
        }
    }
}

$myplugin1_instance = new myplugin1();
?>