Add Post Thumbnails to WordPress RSS Feed

Did you know that if you implement post thumbnails in your theme, they will not be automatically included in your RSS?

You need to add a little function to get them to show up in your feed. It’s not difficult. Just copy and paste this into your functions.php file.

function rss_post_thumbnail($content) {
global $post;
if(has_post_thumbnail($post->ID)) {
$content = '

' . get_the_post_thumbnail($post->ID) .
'

' . get_the_content();
}
return $content;
}
add_filter('the_excerpt_rss', 'rss_post_thumbnail');
add_filter('the_content_feed', 'rss_post_thumbnail');

Source: David Redfern’s Post a Week