Weak hands cannot be planted, meager skills have no foundation. Shallow wisdom is futile, how can one hope for a good name?扰扰从役倦，屑屑身事微。少壮轻年月，迟暮惜光辉。
query("update $wpdb->links SET link_category='$category' WHERE link_id IN ($all_links)");
*/
wp_redirect( $this_file );
exit;
case 'add':
check_admin_referer( 'add-bookmark' );
$redir = wp_get_referer();
if ( add_link() ) {
$redir = add_query_arg( 'added', 'true', $redir );
}
wp_redirect( $redir );
exit;
case 'save':
$link_id = (int) $_POST['link_id'];
check_admin_referer( 'update-bookmark_' . $link_id );
edit_link( $link_id );
wp_redirect( $this_file );
exit;
case 'delete':
$link_id = (int) $_GET['link_id'];
check_admin_referer( 'delete-bookmark_' . $link_id );
wp_delete_link( $link_id );
wp_redirect(