我在我的magento中使用wordpress，使用Fishpig wordpress扩展，我在functions中创建了一个函数。我的主题的php（虽然它是完全集成的，这意味着magento主题应用于博客），但下面的函数似乎没有任何作用。我的职能是

add_filter( \'the_excerpt_rss\', \'insert_thumbnail_into_feed\' );
add_filter( \'the_content_feed\', \'insert_thumbnail_into_feed\' );
function insert_thumbnail_into_feed() {
      global $post;
      if ( has_post_thumbnail( $post->ID ) ){
        // replace thumbnail with yours
        $content = \'<p>\' .get_the_post_thumbnail( $post->ID, \'thumbnail\' ) .\'</p>\';
      }

      // get post content and replace feed content with
      // you can also limit/filter the content to exclude shortcodes and html code etc.
      $content .= \'<p>\' .get_the_content() .\'</p>\';

      return $content;
    }