Bardzo łatwo, po prostu użyj tego kodu:

<?php
/*
Plugin Name: iWorks Random Post Slug
Plugin URI: http://iworks.pl/
Description: Create random post slug.
Version: 1.0.0
Author: Marcin Pietrzak
Author URI: http://iworks.pl/
License: GPLv2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
*/
class iWorks_Random_Post_Slug {
private $length = 10;
private $semaphore = '_iworks_random_slug';
public function __construct() {
add_action( 'publish_post', array( $this, 'action_publish_post_add_random_slug' ), 10, 3 );
}
public function action_publish_post_add_random_slug( $post_id, $post, $old_status ) {
if ( get_post_meta( $post_id, $this->semaphore, true ) ) {
return;
}
add_post_meta( $post_id, $this->semaphore, 'set', true );
$postarr = array(
'ID' => $post_id,
'post_name' => wp_generate_password( $this->length, false, false ),
);
wp_update_post( $postarr );
}
}
new iWorks_Random_Post_Slug;