Set featured image for multiple posts

3 comments

1. You could hook into the publish_post action, check if a featured image has been set, and if not, assign the image you want as the featured image.

   The publish_post Codex page has a nice example about changing a post after it has been published.

2. we can use echo get_the_post_thumbnail($page_ID, 'thumbnail');
   in php tag, where is the page/post id the page/post from where we want to display the featured image. Here is a link for it get_the_post_thumbnail

3. You can do it in your function.php

   update_post_meta($post_id, '_thumbnail_id', $thumbnail_id);
   

   You can also create a function to do this, with as custom fields of the “main” post.

   function setSameThumbnails($post_id) {
       // I assume that your custom field will be something like "31,64,43" for posts ids
       $posts = get_post_meta($post_id, 'same_thumbnail', true);
       if($posts)
       {
           $posts = explode($posts, ',');
           if(is_array($posts))
           {
               foreach($posts as $post)
               {
                   update_post_meta($post, '_thumbnail_id', get_post_thumbnail_id($post_id));
               }           
           }
       }
   }
   add_action('save_post', 'setSameThumbnails');
   

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