Code-Snippets-Functions/Execute a function on a child site/Yoast SEO/replace-site-images-to-cdn-url-in-sitemap.txt

function wpseo_cdn_filter( $uri ) {
  return str_replace( 'http://example.com', 'http://cdn.example.com', $uri );
}
add_filter( 'wpseo_xml_sitemap_img_src', 'wpseo_cdn_filter' );