Function to Change Add Thumbnails into ‘Manage Posts/Pages’ Table

/** * code #13 - add post thumbnails into "manage posts/pages" admin table * source - http://wordpress.stackexchange.com/a/6021/8922 */ if(!function_exists('add_thumb_column') && function_exists('add_theme_support')) { add_theme_support('post-thumbnails', array('post', 'page'));


  function add_thumb_column($cols) {

    $cols['thumbnail'] = __('Thumbnail');

    return $cols;

  }
  function add_thumb_value($column_name, $post_id) {

    $width = 35;

    $height = 35;
    if('thumbnail' == $column_name ) {

      $thumbnail_id = get_post_meta($post_id, '_thumbnail_id', true);
      $attachments = get_children(array('post_parent' => $post_id, 'post_type' => 'attachment', 'post_mime_type' => 'image'));
      if($thumbnail_id)

        $thumb = wp_get_attachment_image($thumbnail_id, array($width, $height), true);

      elseif($attachments) {

        foreach($attachments as $attachment_id => $attachment) {

          $thumb = wp_get_attachment_image($attachment_id, array($width, $height), true);

         }

       }

       if(isset($thumb) && $thumb) {

         echo $thumb;

       } else {

         echo __('None');

       }

    }

  }
  add_filter('manage_posts_columns', 'add_thumb_column');

  add_action('manage_posts_custom_column', 'add_thumb_value', 10, 2);

add_filter('manage_pages_columns', 'add_thumb_column'); add_action('manage_pages_custom_column', 'add_thumb_value', 10, 2);

If your website is prominently using the featured images in posts then you may consider adding this large function to your file. The two filter/action sets will add another column into the ‘manage posts’ and ‘manage pages’ table within the admin panel. This column will display a smaller thumbnail shot of the featured image for each piece of content.

Be aware that loading your pages will probably take just a couple extra seconds. Pulling images into the page is always a bit more tedious, and tack on the database query results as well. But it’s a really nice piece of functionality worth testing out, if you have the time.

Code

Function to Change Add Thumbnails into ‘Manage Posts/Pages’ Table