Probleme bei der Anpassung von Widgets

/**
 * Recent_Comments widget class
 *
 * @since 2.8.0
 */
class WP_Widget_Recent_Comments extends WP_Widget {


    function WP_Widget_Recent_Comments() {
        $widget_ops = array('classname' => 'widget_recent_comments', 'description' => __( 'The most recent comments' ) );
        $this->WP_Widget('recent-comments', __('Recent Comments'), $widget_ops);
        $this->alt_option_name = 'widget_recent_comments';


        if ( is_active_widget(false, false, $this->id_base) )
            add_action( 'wp_head', array(&$this, 'recent_comments_style') );


        add_action( 'comment_post', array(&$this, 'flush_widget_cache') );
        add_action( 'transition_comment_status', array(&$this, 'flush_widget_cache') );
    }


    function recent_comments_style() { ?>
    <style type="text/css">.recentcomments a {display:inline !important;padding:0 !important;margin:0 !important;}</style>
<?php
    }


    function flush_widget_cache() {
        wp_cache_delete('widget_recent_comments', 'widget');
    }


    function widget( $args, $instance ) {
        global $comments, $comment;


        $cache = wp_cache_get('widget_recent_comments', 'widget');


        if ( ! is_array( $cache ) )
            $cache = array();


        if ( isset( $cache[$args['widget_id']] ) ) {
            echo $cache[$args['widget_id']];
            return;
        }


         extract($args, EXTR_SKIP);
         $output = '';
         $title = apply_filters('widget_title', empty($instance['title']) ? __('Recent Comments') : $instance['title']);


        if ( ! $number = (int) $instance['number'] )
             $number = 5;
         else if ( $number < 1 )
             $number = 1;


        $comments = get_comments( array( 'number' => $number, 'status' => 'approve' ) );
        $output .= $before_widget;
        if ( $title )
            $output .= $before_title . $title . $after_title;


        $output .= '<ul id="recentcomments"><br>';
        if ( $comments ) {
            foreach ( (array) $comments as $comment) {
                $output .=  '<li class="recentcomments">' . /* translators: comments widget: 1: comment author, 2: post link */ sprintf(_x('%1$s on %2$s', 'widgets'), get_comment_author_link(), '<a href="' . esc_url( get_comment_link($comment->comment_ID) ) . '">' . get_the_title($comment->comment_post_ID) . '</a>') . '</li><br>';
            }
         }
        $output .= '</ul>';
        $output .= $after_widget;


        echo $output;
        $cache[$args['widget_id']] = $output;
        wp_cache_set('widget_recent_comments', $cache, 'widget');
    }


    function update( $new_instance, $old_instance ) {
        $instance = $old_instance;
        $instance['title'] = strip_tags($new_instance['title']);
        $instance['number'] = (int) $new_instance['number'];
        $this->flush_widget_cache();


        $alloptions = wp_cache_get( 'alloptions', 'options' );
        if ( isset($alloptions['widget_recent_comments']) )
            delete_option('widget_recent_comments');


        return $instance;
    }


    function form( $instance ) {
        $title = isset($instance['title']) ? esc_attr($instance['title']) : '';
        $number = isset($instance['number']) ? absint($instance['number']) : 5;
?>
        <p><label for="<?php echo $this->get_field_id('title'); ?>"><?php _e('Title:'); ?></label>
        <input class="widefat" id="<?php echo $this->get_field_id('title'); ?>" name="<?php echo $this->get_field_name('title'); ?>" type="text" value="<?php echo $title; ?>" /></p>


        <p><label for="<?php echo $this->get_field_id('number'); ?>"><?php _e('Number of comments to show:'); ?></label>
        <input id="<?php echo $this->get_field_id('number'); ?>" name="<?php echo $this->get_field_name('number'); ?>" type="text" value="<?php echo $number; ?>" size="3" /></p>
<?php
    }
}


/**
 * RSS widget class
 *
 * @since 2.8.0
 */
class WP_Widget_RSS extends WP_Widget {


    function WP_Widget_RSS() {
        $widget_ops = array( 'description' => __('Entries from any RSS or Atom feed') );
        $control_ops = array( 'width' => 400, 'height' => 200 );
        $this->WP_Widget( 'rss', __('RSS'), $widget_ops, $control_ops );
    }


    function widget($args, $instance) {


        if ( isset($instance['error']) && $instance['error'] )
            return;


        extract($args, EXTR_SKIP);


        $url = $instance['url'];
        while ( stristr($url, 'http') != $url )
            $url = substr($url, 1);


        if ( empty($url) )
            return;


        $rss = fetch_feed($url);
        $title = $instance['title'];
        $desc = '';
        $link = '';


        if ( ! is_wp_error($rss) ) {
            $desc = esc_attr(strip_tags(@html_entity_decode($rss->get_description(), ENT_QUOTES, get_option('blog_charset'))));
            if ( empty($title) )
                $title = esc_html(strip_tags($rss->get_title()));
            $link = esc_url(strip_tags($rss->get_permalink()));
            while ( stristr($link, 'http') != $link )
                $link = substr($link, 1);
        }


        if ( empty($title) )
            $title = empty($desc) ? __('Unknown Feed') : $desc;


        $title = apply_filters('widget_title', $title, $instance, $this->id_base);
        $url = esc_url(strip_tags($url));
        $icon = includes_url('images/rss.png');
        if ( $title )
            $title = "<a class='rsswidget' href='$url' title='" . esc_attr__( 'Syndicate this content' ) ."'><img style='border:0' width='14' height='14' src='$icon' alt='RSS' /></a> <a class='rsswidget' href='$link' title='$desc'>$title</a>";


        echo $before_widget;
        if ( $title )
            echo $before_title . $title . $after_title;
        wp_widget_rss_output( $rss, $instance );
        echo $after_widget;


        if ( ! is_wp_error($rss) )
            $rss->__destruct();
        unset($rss);
    }


    function update($new_instance, $old_instance) {
        $testurl = ( isset($new_instance['url']) && ($new_instance['url'] != $old_instance['url']) );
        return wp_widget_rss_process( $new_instance, $testurl );
    }


    function form($instance) {


        if ( empty($instance) )
            $instance = array( 'title' => '', 'url' => '', 'items' => 10, 'error' => false, 'show_summary' => 0, 'show_author' => 0, 'show_date' => 0 );
        $instance['number'] = $this->number;


        wp_widget_rss_form( $instance );
    }