widget plugin

<?php
/*
Plugin Name: Forum Display
Plugin URI: http://thehost.ninja/
Description: This plugin adds a custom widget.
Version: 1.0
Author: Modified by Jason Cook/Written by bbPress
Author URI: http://bbpress.org/
License: GPL2
*/
// Exit if accessed directly
if ( !defined( 'ABSPATH' ) ) exit;
// The widget class
/**
 * bbPress Forum Widget
 *
 * Adds a widget which displays the forum list
 *
 * @since bbPress (r2653)
 *
 * @uses WP_Widget
 */
class forumdisplay_widget extends WP_Widget {

    /**
     * bbPress Forum Widget
     *
     * Registers the forum widget
     *
     * @since bbPress (r2653)
     *
     * @uses apply_filters() Calls 'bbp_forums_widget_options' with the
     *                        widget options
     */
    public function __construct() {
        $widget_ops = apply_filters( 'forumdisplay_widget_options', array(
            'classname'   => 'widget_display_forums',
            'description' => __( 'A list of forums with an option to set the parent.', 'bbpress' )
        ) );

        parent::__construct( false, __( 'Forum Display', 'bbpress' ), $widget_ops );
    }

    /**
     * Register the widget
     *
     * @since bbPress (r3389)
     *
     * @uses register_widget()
     */
    public static function register_widget() {
        register_widget( 'forumdisplay_widget' );
    }

    /**
     * Displays the output, the forum list
     *
     * @since bbPress (r2653)
     *
     * @param mixed $args Arguments
     * @param array $instance Instance
     * @uses apply_filters() Calls 'bbp_forum_widget_title' with the title
     * @uses get_option() To get the forums per page option
     * @uses current_user_can() To check if the current user can read
     *                           private() To resety name
     * @uses bbp_has_forums() The main forum loop
     * @uses bbp_forums() To check whether there are more forums available
     *                     in the loop
     * @uses bbp_the_forum() Loads up the current forum in the loop
     * @uses bbp_forum_permalink() To display the forum permalink
     * @uses bbp_forum_title() To display the forum title
     */
    public function widget( $args, $instance ) {

        // Get widget settings
        $settings = $this->parse_settings( $instance );

        // Typical WordPress filter
        $settings['title'] = apply_filters( 'widget_title',           $settings['title'], $instance, $this->id_base );

        // bbPress filter
        $settings['title'] = apply_filters( 'forumdisplay_widget_title', $settings['title'], $instance, $this->id_base );

        // Note: private and hidden forums will be excluded via the
        // bbp_pre_get_posts_normalize_forum_visibility action and function.
        $widget_query = new WP_Query( array(
            'post_type'           => bbp_get_forum_post_type(),
            'post_parent'         => $settings['parent_forum'],
            'post_status'         => bbp_get_public_status_id(),
            'posts_per_page'      => get_option( '_bbp_forums_per_page', 50 ),
            'ignore_sticky_posts' => true,
            'no_found_rows'       => true,
            'orderby'             => 'menu_order title',
            'order'               => 'ASC'
        ) );

        // Bail if no posts
        if ( ! $widget_query->have_posts() ) {
            return;
        }

        echo $args['before_widget'];

        if ( !empty( $settings['title'] ) ) {
            echo $args['before_title'] . $settings['title'] . $args['after_title'];
        } ?>

        <ul>

            <?php while ( $widget_query->have_posts() ) : $widget_query->the_post(); ?>

                <li><a class="bbp-forum-title" href="<?php bbp_forum_permalink( $widget_query->post->ID ); ?>"><?php bbp_forum_title( $widget_query->post->ID ); ?></a></li>

            <?php endwhile; ?>

        </ul>

        <?php echo $args['after_widget'];

        // Reset the $post global
        wp_reset_postdata();
    }

    /**
     * Update the forum widget options
     *
     * @since bbPress (r2653)
     *
     * @param array $new_instance The new instance options
     * @param array $old_instance The old instance options
     */
    public function update( $new_instance, $old_instance ) {
        $instance                 = $old_instance;
        $instance['title']        = strip_tags( $new_instance['title'] );
        $instance['parent_forum'] = sanitize_text_field( $new_instance['parent_forum'] );

        // Force to any
        if ( !empty( $instance['parent_forum'] ) && !is_numeric( $instance['parent_forum'] ) ) {
            $instance['parent_forum'] = 'any';
        }

        return $instance;
    }

    /**
     * Output the forum widget options form
     *
     * @since bbPress (r2653)
     *
     * @param $instance Instance
     * @uses BBP_Forums_Widget::get_field_id() To output the field id
     * @uses BBP_Forums_Widget::get_field_name() To output the field name
     */
    public function form( $instance ) {

        // Get widget settings
        $settings = $this->parse_settings( $instance ); ?>

        <p>
            <label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php _e( 'Title:', 'bbpress' ); ?>
                <input class="widefat" id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" type="text" value="<?php echo esc_attr( $settings['title'] ); ?>" />
            </label>
        </p>

        <p>
            <label for="<?php echo $this->get_field_id( 'parent_forum' ); ?>"><?php _e( 'Parent Forum ID:', 'bbpress' ); ?>
                <input class="widefat" id="<?php echo $this->get_field_id( 'parent_forum' ); ?>" name="<?php echo $this->get_field_name( 'parent_forum' ); ?>" type="text" value="<?php echo esc_attr( $settings['parent_forum'] ); ?>" />
            </label>

            <br />

            <small><?php _e( '"0" to show only root - "any" to show all', 'bbpress' ); ?></small>
        </p>

        <?php
    }

    /**
     * Merge the widget settings into defaults array.
     *
     * @since bbPress (r4802)
     *
     * @param $instance Instance
     * @uses bbp_parse_args() To merge widget settings into defaults
     */
    public function parse_settings( $instance = array() ) {
        return bbp_parse_args( $instance, array(
            'title'        => __( 'Forums', 'bbpress' ),
            'parent_forum' => 0
        ), 'forum_widget_settings' );
    }
}