How To Create WordPress Widgets

class My_Simple_Widget {
 
   function control(){
      $data = get_option('My_Simple_Widget_data');
      ?>
         <p><label>Title:</label> <input name="My_Simple_Widget_title" type="text" value="<?php echo $data['title']; ?>" /></p>
         You can have whatever you want here, even a huge form with any kind of form field you want...
      <?php
      if (isset($_POST['My_Simple_Widget_title'])) {
			$data['title'] = attribute_escape($_POST['My_Simple_Widget_title']);
			update_option('My_Simple_Widget_data', $data);
      }
   }
 
   function widget($args) {
		$data = get_option('My_Simple_Widget_data');
		echo $args['before_widget'];
		echo $args['before_title'] .$data['title'] .$args['after_title'];
		echo 'Here you can have whatever you can imagine...';
		echo $args['after_widget'];
   }
 
}
 
wp_register_sidebar_widget('My_Simple_Widget_ID', 'My Simple Widget Title', array('My_Simple_Widget', 'widget'));
wp_register_widget_control('My_Simple_Widget_ID', 'My Simple Widget Title', array('My_Simple_Widget', 'control'));