PHP: WordPress | register basic widget

gistfile1

add_action( 'widgets_init', 'example_load_widgets' );

/**
 * Register our widget.
 * 'Example_Widget' is the widget class used below.
 *
 * @since 0.1
 */
function example_load_widgets() {
	register_widget( 'Example_Widget' );
}

/**
 * Example Widget class.
 * This class handles everything that needs to be handled with the widget:
 * the settings, form, display, and update.  Nice!
 *
 * @since 0.1
 */
class Example_Widget extends WP_Widget {

	/**
	 * Widget setup.
	 */
	function Example_Widget() {
		/* Widget settings. */
		$widget_ops = array( 'classname' => 'sidebar-menu', 'description' => __('Displays a menu in the side bar of "Review Us", "Welcome Packet" and "Patient Forms".', 'example') );

		/* Widget control settings. */
		$control_ops = array( 'width' => 300, 'height' => 350, 'id_base' => 'example-widget' );

		/* Create the widget. */
		$this->WP_Widget( 'example-widget', __('Dental Health Sidebar Menu', 'example'), $widget_ops, $control_ops );
	}

	/**
	 * How to display the widget on the screen.
	 */
	function widget( $args, $instance ) {
		extract( $args );

		/* Our variables from the widget settings. */
		//$title = apply_filters('widget_title', $instance['title'] );
		$review = $instance['review'];

		/* Before widget (defined by themes). */
		echo $before_widget;


		/* Display name from widget settings if one was input. */
		if ( $review )
			printf( '<a href="%1$s">Review us</a>', $review );

		/* After widget (defined by themes). */
		echo $after_widget;
	}

	/**
	 * Update the widget settings.
	 */
	function update( $new_instance, $old_instance ) {
		$instance = $old_instance;

		/* Strip tags for title and name to remove HTML (important for text inputs). */
		$instance['review'] = strip_tags( $new_instance['review'] );



		return $instance;
	}

	/**
	 * Displays the widget settings controls on the widget panel.
	 * Make use of the get_field_id() and get_field_name() function
	 * when creating your form elements. This handles the confusing stuff.
	 */
	function form( $instance ) {

		/* Set up some default widget settings. */
		$defaults = array('review' => 'http://www.example.com');
		$instance = wp_parse_args( (array) $instance, $defaults ); ?>
		<p>
			Enter (Copy and Paste) the URLS to the pages you'd like the following menu items to link to. 
		</p>

		<!-- Your Name: Text Input -->
		<p>
			<label for="<?php echo $this->get_field_id( 'review' ); ?>"><?php _e('Review:', 'example'); ?></label>
			<input id="<?php echo $this->get_field_id( 'review' ); ?>" name="<?php echo $this->get_field_name( 'review' ); ?>" value="<?php echo $instance['review']; ?>" style="width:100%;" />
		</p>


	<?php
	}
}