Featured Image In Feed

Hi,

I am trying to add featured image in RSS feed.

I got this code from a site,

<?php
/**
* Add Featured Image to RSS feed
*
**/
add_filter( ‘the_content’, ‘ld_featured_image_in_feed’ );
function ld_featured_image_in_feed( $content ) {
global $post;
if( is_feed() ) {
if ( has_post_thumbnail( $post->ID ) ){
$feat_image_output = get_the_post_thumbnail( $post->ID, ‘full’, array( ‘style’ => ‘height: auto;margin-bottom:2em;max-width: 600px !important;padding-top: 0.75em;width: 100% !important;’ ) );
$content = $feat_image_output . $content;
}
}
return $content;
}
?>

But it’s not working.

Is there any change I must do in this code?

Please help me with this.

Thank You.