apply_filters( 'admin_post_thumbnail_html', string $content, int $post_id, int|null $thumbnail_id )

1701<?php1702	 * @since 4.6.0 Added the `$thumbnail_id` parameter.1703	 *1704	 * @param string   $content      Admin post thumbnail HTML markup.1705	 * @param int      $post_id      Post ID.1706	 * @param int|null $thumbnail_id Thumbnail attachment ID, or null if there isn't one.1707	 */1708	return apply_filters( 'admin_post_thumbnail_html', $content, $post->ID, $thumbnail_id );1709}1710 1711/**1712 * Determines whether the post is currently being edited by another user.1713 *1714 * @since 2.5.0