我在页面中实现了片段缓存。我从https://css-tricks.com/wordpress-fragment-caching-revisited/.

是这样的：

    function fragment_cache($key, $ttl, $function) {
      if ( is_user_logged_in() ) {
        call_user_func($function);
        return;
      }
      $key = apply_filters(\'fragment_cache_prefix\',\'fragment_cache_\').$key;
      $output = get_transient($key);
      if ( empty($output) ) {
        ob_start();
        call_user_func($function);
        $output = ob_get_clean();
        set_transient($key, $output, $ttl);
      }
      echo $output;
    }