function the_post_thumbnail_caption() {
global $post;
$thumb_id = get_post_thumbnail_id($post->id);
$args = array(
'post_type' => 'attachment',
'post_status' => null,
'post_parent' => $post->ID,
'include' => $thumb_id
);
$thumbnail_image = get_posts($args);
if ($thumbnail_image && isset($thumbnail_image[0])) {
//show thumbnail title
echo $thumbnail_image[0]->post_title;
//Uncomment to show the thumbnail caption
//echo $thumbnail_image[0]->post_excerpt;
//Uncomment to show the thumbnail description
//echo $thumbnail_image[0]->post_content;
//Uncomment to show the thumbnail alt field
//$alt = get_post_meta($thumbnail_id, '_wp_attachment_image_alt', true);
//if(count($alt)) echo $alt;
}
}
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