WordPress/wp-commentsrss2.php

<?php 

if (empty($wp)) {
	require_once('wp-config.php');
	wp('feed=rss2&withcomments=1');
}

header('Content-type: text/xml;charset=' . get_option('blog_charset'), true);

echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>'; 
?>
<!-- generator="wordpress/<?php echo $wp_version ?>" -->
<rss version="2.0" 
	xmlns:content="http://purl.org/rss/1.0/modules/content/">
<channel>
<?php
$i = 0;
if (have_posts()) :
  while (have_posts()) : the_post();
	if ($i < 1) {
		$i++;
?>
	<title><?php if (is_single() || is_page() ) { printf(__('Comments on: %s'), get_the_title_rss()); } else { printf(__('Comments for %s'), get_bloginfo_rss("name")); } ?></title>
	<link><?php (is_single()) ? permalink_single_rss() : bloginfo_rss("url") ?></link>
	<description><?php bloginfo_rss("description") ?></description>
	<pubDate><?php echo gmdate('r'); ?></pubDate>
	<generator>http://wordpress.org/?v=<?php echo $wp_version ?></generator>

<?php 
		if (is_single() || is_page()) {
			$comments = $wpdb->get_results("SELECT comment_ID, comment_author, comment_author_email, 
			comment_author_url, comment_date, comment_date_gmt, comment_content, comment_post_ID, 
			$wpdb->posts.ID, $wpdb->posts.post_password FROM $wpdb->comments 
			LEFT JOIN $wpdb->posts ON comment_post_id = id WHERE comment_post_ID = '" . get_the_ID() . "' 
			AND $wpdb->comments.comment_approved = '1' AND $wpdb->posts.post_status = 'publish' 
			AND post_date_gmt < '" . gmdate("Y-m-d H:i:59") . "' 
			ORDER BY comment_date_gmt DESC LIMIT " . get_option('posts_per_rss') );
		} else { // if no post id passed in, we'll just ue the last 10 comments.
			$comments = $wpdb->get_results("SELECT comment_ID, comment_author, comment_author_email, 
			comment_author_url, comment_date, comment_date_gmt, comment_content, comment_post_ID, 
			$wpdb->posts.ID, $wpdb->posts.post_password FROM $wpdb->comments 
			LEFT JOIN $wpdb->posts ON comment_post_id = id WHERE $wpdb->posts.post_status = 'publish' 
			AND $wpdb->comments.comment_approved = '1' AND post_date_gmt < '" . gmdate("Y-m-d H:i:s") . "'  
			ORDER BY comment_date_gmt DESC LIMIT " . get_option('posts_per_rss') );
		}
	// this line is WordPress' motor, do not delete it.
		if ($comments) {
			foreach ($comments as $comment) {
				$GLOBALS['comment'] =& $comment;
				// Some plugins may need to know the metadata
				// associated with this comment's post:
				get_post_custom($comment->comment_post_ID);
?>
	<item>
		<title><?php if ( ! (is_single() || is_page()) ) {
			$title = get_the_title($comment->comment_post_ID);
			$title = apply_filters('the_title', $title);
			$title = apply_filters('the_title_rss', $title);
			printf(__('Comment on %1$s by %2$s'), $title, get_comment_author_rss());
		} else {
			printf(__('by: %s'), get_comment_author_rss());
		} ?></title>
		<link><?php comment_link() ?></link>
		<pubDate><?php echo mysql2date('D, d M Y H:i:s +0000', get_comment_time('Y-m-d H:i:s', true), false); ?></pubDate>
		<guid><?php comment_link() ?></guid>
			<?php 
			if (!empty($comment->post_password) && $_COOKIE['wp-postpass'] != $comment->post_password) {
			?>
		<description><?php _e('Protected Comments: Please enter your password to view comments.'); ?></description>
		<content:encoded><![CDATA[<?php echo get_the_password_form() ?>]]></content:encoded>
			<?php
			} else {
			?>
		<description><?php comment_text_rss() ?></description>
		<content:encoded><![CDATA[<?php comment_text() ?>]]></content:encoded>
			<?php 
			} // close check for password 
			?>
	</item>
<?php 
			} 
		}
	}
endwhile; endif;
?>
</channel>
</rss>