source: trunk/www.guidonia.net/wp/wp-content/themes/atahualpa/functions/bfa_comment_walker.php@ 44

<?php
class Walker_Comment2 extends Walker {
        /**
         * @see Walker::$tree_type
         * @since unknown
         * @var string
         */
        var $tree_type = 'comment';

        /**
         * @see Walker::$db_fields
         * @since unknown
         * @var array
         */
        var $db_fields = array ('parent' => 'comment_parent', 'id' => 'comment_ID');

        /**
         * @see Walker::start_lvl()
         * @since unknown
         *
         * @param string $output Passed by reference. Used to append additional content.
         * @param int $depth Depth of comment.
         * @param array $args Uses 'style' argument for type of HTML list.
         */
        function start_lvl(&$output, $depth, $args) {
                $GLOBALS['comment_depth'] = $depth + 1;

                switch ( $args['style'] ) {
                        case 'div':
                                break;
                        case 'ol':
                                echo "<ol class='children'>\n";
                                break;
                        default:
                        case 'ul':
                                echo "<ul class='children'>\n";
                                break;
                }
        }

        /**
         * @see Walker::end_lvl()
         * @since unknown
         *
         * @param string $output Passed by reference. Used to append additional content.
         * @param int $depth Depth of comment.
         * @param array $args Will only append content if style argument value is 'ol' or 'ul'.
         */
        function end_lvl(&$output, $depth, $args) {
                $GLOBALS['comment_depth'] = $depth + 1;

                switch ( $args['style'] ) {
                        case 'div':
                                break;
                        case 'ol':
                                echo "</ol>\n";
                                break;
                        default:
                        case 'ul':
                                echo "</ul>\n";
                                break;
                }
        }

        /**
         * @see Walker::start_el()
         * @since unknown
         *
         * @param string $output Passed by reference. Used to append additional content.
         * @param object $comment Comment data object.
         * @param int $depth Depth of comment in reference to parents.
         * @param array $args
         */
        function start_el(&$output, $comment, $depth, $args) {
                $depth++;
                $GLOBALS['comment_depth'] = $depth;

                if ( !empty($args['callback']) ) {
                        call_user_func($args['callback'], $comment, $args, $depth);
                        return;
                }

                $GLOBALS['comment'] = $comment;
                extract($args, EXTR_SKIP);

                if ( 'div' == $args['style'] ) {
                        $tag = 'div';
                        $add_below = 'comment';
                } else {
                        $tag = 'li';
                        $add_below = 'div-comment';
                }
?>
                <<?php echo $tag ?> <?php comment_class($class='clearfix') ?> id="comment-<?php comment_ID() ?>">
                <?php if ( 'ul' == $args['style'] ) : ?>
                <div id="div-comment-<?php comment_ID() ?>" class="clearfix comment-container
                <?php 
                $comment = get_comment($comment_id);
                if ( $post = get_post($post_id) ) {
                        if ( $comment->user_id === $post->post_author )
                                echo ' bypostauthor';
                } ?>">
                <?php endif; ?>
                <div class="comment-author vcard">
                <?php if ($args['avatar_size'] != 0) echo get_avatar( $comment, $args['avatar_size'] ); ?>
                <span class="authorname"><?php printf(__('%s'), get_comment_author_link()) ?></span>
                </div>
<?php if ($comment->comment_approved == '0') : ?>
                <em><?php _e('Your comment is awaiting moderation.','atahualpa'); ?></em>
                <br />
<?php endif; ?>
                <div class="comment-meta commentmetadata">
                <a href="<?php echo htmlspecialchars( get_comment_link( $comment->comment_ID, $page ) ) ?>">
                <?php printf(__('%1$s at %2$s'), get_comment_date(__('F jS, Y','atahualpa')),  get_comment_time()) ?>
                </a><?php comment_reply_link(array_merge( $args, array('add_below' => $add_below, 'depth' => $depth, 'max_depth' => $args['max_depth']))) ?>
                <?php edit_comment_link(__(' &middot; Edit','atahualpa'),'','') ?>
                </div>
                <?php comment_text() ?>
                <?php if ( 'ul' == $args['style'] ) : ?>
                </div>
                <?php endif; ?>
<?php
        }

        /**
         * @see Walker::end_el()
         * @since unknown
         *
         * @param string $output Passed by reference. Used to append additional content.
         * @param object $comment
         * @param int $depth Depth of comment.
         * @param array $args
         */
        function end_el(&$output, $comment, $depth, $args) {
                if ( !empty($args['end-callback']) ) {
                        call_user_func($args['end-callback'], $comment, $args, $depth);
                        return;
                }
                if ( 'div' == $args['style'] )
                        echo "</div>\n";
                else
                        echo "</li>\n";
        }

}
?>