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

1683<?php1684	 * @since 4.6.0 Added the `$thumbnail_id` parameter.1685	 *1686	 * @param string   $content      Admin post thumbnail HTML markup.1687	 * @param int      $post_id      Post ID.1688	 * @param int|null $thumbnail_id Thumbnail attachment ID, or null if there isn't one.1689	 */1690	return apply_filters( 'admin_post_thumbnail_html', $content, $post->ID, $thumbnail_id );1691}1692 1693/**1694 * Determines whether the post is currently being edited by another user.1695 *1696 * @since 2.5.0