WP Update Slug by ID. www.pealm.com

update_slug_by_id.php

<?php

function update_slug_by_id($slug, $id) {
		global $wpdb;

		// Update slug and make it unique
		$slug = (empty($slug)) ? get_the_title($id) : $slug;
		$slug = sanitize_title($slug);

		$new_slug = wp_unique_post_slug($slug, $id, get_post_status($id), get_post_type($id), null);
		$wpdb->query("UPDATE $wpdb->posts SET post_name = '$new_slug' WHERE ID = '$id'");

		return $new_slug;
}