Php 如何在Wordpress中递归地将特色图像应用于子页面？

如果页面没有特征图像，则显示其父页面的特征图像

如果父级没有特征图像，则从下一个更高级别获取，依此类推，直到找到特征图像或达到最后一个级别

Wordpress中是否有解决方案？

在functions.php中添加以下代码，并根据需要进行修改：
Add the below code in your functions.php and modify as per your need:

function get_featured_recursive($post) {

  if (has_post_thumbnail( $post->ID ) ) {

    return $post->ID;

  } else if ($post->post_parent != 0) {

    return get_featured_recursive(get_post($post->post_parent));

  } else {

    return null;

  }
}

//In you display page:
div id="featured">

< ?php $featured_image_post = get_featured_recursive($post); if ($featured_image_post != null) : $featured_image_src = wp_get_attachment_image_src(get_post_thumbnail_id($featured_image_post), 'single-post-thumbnail'); ?>

<div id="featured-bg"><img src="<?php echo$featured_image_src[0]; ?>" alt="<?php echo the_post_thumbnail_caption_from_id($featured_image_post); ?>" /> </div> </div> <div id="featured-caption">< ?php echo the_post_thumbnail_caption_from_id($featured_image_post); ?></div></div>

函数get\u featured\u recursive（$post）{
如果（有帖子缩略图（$post->ID））{
返回$post->ID；
}else if（$post->post\u parent！=0）{
返回get_recursive（get_post（$post->post_parent））；
}否则{
返回null；
}
}
//在您的显示页面中：
div id=“特色”>
<？php$featured\u image\u post=get\u featured\u recursive（$post）；如果（$featured\u image\u post！=null）：$featured\u image\u src=wp\u get\u attachment\u image\u src（get\u post\u thumbnail\u id（$featured\u image\u post），'single post thumbnail'）；？>
“alt=”“/><？php从_id（$featured _image _post）；？>

您可以使用如下递归函数：

  function get_featured_recursive($post) {

      if (has_post_thumbnail( $post->ID ) ) {

      return $post->ID;

      } else if (!has_post_thumbnail($post->ID) && $post->post_parent != 0) {

      $parent = get_post($post->post_parent);

      if (has_post_thumbnail($parent->ID)){

      return $parent->ID;
      }

      } else if(!has_post_thumbnail($parent->ID) && $parent->post_parent != 0){

      get_featured_recursive(get_post($parent->post_parent));

      }        
      else if(!has_post_thumbnail($parent->ID) && $parent->post_parent == 0 )
      { 
         return null;
      }

  }

然后在模板中使用此选项显示特色图像：

< ?php $featured_image_post = get_featured_recursive($post);
if ($featured_image_post != null) : $featured_image_src = wp_get_attachment_image_src(get_post_thumbnail_id($featured_image_post), 'single-post-thumbnail'); ?>

<？php$featured\u image\u post=get\u featured\u recursive（$post）；
如果（$featured\u image\u post！=null）：$featured\u image\u src=wp\u get\u attachment\u image\u src（get\u post\u thumbnail\u id（$featured\u image\u post），'single post thumbnail'）；？>