javiergbas

// Add post thumbnails to RSS feed
function rss_post_thumbnail($content) {
  global $post;
  if(has_post_thumbnail($post->ID)) {
    $content = '<p>' . get_the_post_thumbnail($post->ID) . '</p>' . get_the_content();
  }
  return $content;
}
add_filter('the_excerpt_rss', 'rss_post_thumbnail');
add_filter('the_content_feed', 'rss_post_thumbnail');

javiergbas

// Yoast seo WPML sitemap
// Only display content in current language
if (isset($sitepress)) add_filter('wpseo_posts_join', 'sitemap_per_language', 10, 2);
function sitemap_per_language($join, $type) {
  global $wpdb, $sitepress;
  $lang = $sitepress->get_current_language();
  return " JOIN " . $wpdb->prefix . "icl_translations ON element_id = ID AND element_type = 'post_$type' AND language_code = '$lang'";
}