--- a/wp/wp-admin/link.php	Tue Dec 15 15:52:01 2020 +0100
+++ b/wp/wp-admin/link.php	Wed Sep 21 18:19:35 2022 +0200
@@ -60,7 +60,7 @@
 			wp_redirect( $this_file );
 			exit;
 		}
-		$all_links = join( ',', $linkcheck );
+		$all_links = implode( ',', $linkcheck );
 		/*
 		 * Should now have an array of links we can change:
 		 *     $q = $wpdb->query("update $wpdb->links SET link_category='$category' WHERE link_id IN ($all_links)");