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Adds the post thumbnail to the WordPress RSS feed
add_action( 'rss2_item', 'cameronjonesweb_add_post_thumbnail_to_rss' );
function cameronjonesweb_add_post_thumbnail_to_rss() {
if ( has_post_thumbnail() ) {
"\t" . '<media:content url="%1$s" type="%2$s" />' . "\n",
esc_url( get_the_post_thumbnail_url() ),
esc_attr( get_post_mime_type( get_post_thumbnail_id() ) )
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