[Plugin: Google Adsense for Feeds] Code Problem

$publisher is outside the scope of the function adsense_for_feeds, and should therfore be declared as global.

ie.:

$publisher = 'ca-pub-XXXXXXX';

add_filter('the_content', 'adsense_for_feeds');

function adsense_for_feeds( $content ) {

	global $post, $id;
	$blog_key = substr( md5( get_bloginfo('url') ), 0, 16 );
	if ( ! is_feed() ) return $content;

the line global $port, $id; should be changed to global $id, $post, $publisher

http://wordpress.org/extend/plugins/adsense-for-feeds/