如果您想在使用wp editor添加的锚图像包装器上添加一个类，那么可以添加以下代码：这将过滤内容并向图像添加类

<?php    
function add_class_to_gallery($content) {

      $classes = \'gallery-link\';         
      // check if there are already a class property assigned to the anchor
      if ( preg_match(\'/<a.*? class=".*?"><img/\', $content) ) {
        // If there is, simply add the class
        $content = preg_replace(\'/(<a.*? class=".*?)(".*?><img)/\', \'$1 \' . $classes . \'$2\', $content);
      } else {
        // If there is not an existing class, create a class property
        $content = preg_replace(\'/(<a.*?)><img/\', \'$1 class="\' . $classes . \'" ><img\', $content);
      }
      return $content;
}
add_filter(\'the_content\',\'add_class_to_gallery\');

<?php if (has_post_thumbnail()) : ?>    
    <a href="<?php the_permalink(); ?>" class="gallery-link" title="<?php the_title_attribute(); ?>" target="_blank"><img src="<?php the_post_thumbnail_url(); ?>" alt="<?php the_title_attribute(); ?>"/></a>
<?php endif;?>