add featured image to wordpress feed

feed featured image.php

/*  ----------------------------------------------------------------------------
    FEED FEATURED IMAGE
 */
function featuredtoRSS($content) {
global $post;
if ( has_post_thumbnail( $post->ID ) ){
$content = '<div>' . get_the_post_thumbnail( $post->ID, 'medium', array( 'style' => 'margin-bottom: 15px;' ) ) . '</div>' . $content;
}
return $content;
}
 
add_filter('the_excerpt_rss', 'featuredtoRSS');
add_filter('the_content_feed', 'featuredtoRSS');
/*  ----------------------------------------------------------------------------
    END FEED FEATURED IMAGE
 */