the_post_thumbnail_caption

WordPress Version: 4.6

/**
 * Displays the post thumbnail caption.
 *
 * @since 4.6.0
 *
 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global `$post`.
 */
function the_post_thumbnail_caption($post = null)
{
    /**
     * Filters the displayed post thumbnail caption.
     *
     * @since 4.6.0
     *
     * @param string $caption Caption for the given attachment.
     */
    echo apply_filters('the_post_thumbnail_caption', get_the_post_thumbnail_caption($post));
}