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

1694<?php1695	 * @since 4.6.0 Added the `$thumbnail_id` parameter.1696	 *1697	 * @param string   $content      Admin post thumbnail HTML markup.1698	 * @param int      $post_id      Post ID.1699	 * @param int|null $thumbnail_id Thumbnail attachment ID, or null if there isn't one.1700	 */1701	return apply_filters( 'admin_post_thumbnail_html', $content, $post->ID, $thumbnail_id );1702}1703 1704/**1705 * Determines whether the post is currently being edited by another user.1706 *1707 * @since 2.5.0