Display Featured Image Caption

May 01, 2015

Customize your theme further by enabling the ability to show the caption when using the Featured Image.

function the_post_thumbnail_caption() {
  global $post;

  $thumbnail_id    = get_post_thumbnail_id($post->ID);
  $thumbnail_image = get_posts(array('p' => $thumbnail_id, 'post_type' => 'attachment'));

  if ($thumbnail_image && isset($thumbnail_image[0])) {
    echo '<span>'.$thumbnail_image[0]->post_excerpt.'</span>';
  }
}

Usage - the_post_thumbnail_caption();

Sourced here.