Snippet: Better RSS Feeds (Removes Shortcodes & Displays Thumbnail)

// IMPORTANT: Use this function to clear your RSS cache so you can see your changes, then REMOVE it
function prefix_set_feed_cache_time( $seconds ) {
	return 0;
}
add_filter( 'wp_feed_cache_transient_lifetime' , 'prefix_set_feed_cache_time' );

// Custom RSS feed
function my_custom_rss_feed( $content ) {

	// Get post
	global $post;

	// Generate 50 word excerpt using the Total wpex_excerpt function
	// This will strip out shortcodes from the Visual Composer
	$content = wpex_get_excerpt( array(
		'length' => 50,
		'more'   => false // remove hellip
	) );

	// Display post thumbnail if defined
	if ( has_post_thumbnail( $post->ID ) ){
		$content = get_the_post_thumbnail( $post->ID, 'full', array( 'style' => 'float:left; margin:0 15px 15px 0;' ) ) . $content;
	}

	// Return the content
	return $content;

}
add_filter( 'the_excerpt_rss', 'my_custom_rss_feed', 999 );
add_filter( 'the_content_feed', 'my_custom_rss_feed', 999 );