wordpress-save-post-action-custom-post-type.php

<?php
/*
Sometimes you need to do some kind of action to a custom post type after its saved.

In the case of this function my scenario is:
1. I have a custom post type registered called: clients
2. I want the url of their details page to be: /client-number-999/ (where 999 is the post_id - or client id)

Created by craig@123marbella.com on 16th of August 2017

This script should go into your themes function.php file.
*/
function clients_save_post( $post_id ) {
		
	global $post;
	
	// If the post type is "clients" lets change the post_name
	if ($post->post_type == 'clients'){

		if ( ! wp_is_post_revision( $post_id ) ){

    //here we will convert the post name
		$my_args = array(
		'ID'           => $post_id,
		'post_name'   => "client-number-". $post_id,
		);

		// unhook this function so it doesn't loop infinitely
		remove_action('save_post', 'clients_save_post');

		// update the post, which calls save_post again
		wp_update_post( $my_args );

		// re-hook this function
		add_action('save_post', 'clients_save_post');
		}

	}
	
}
add_action( 'save_post', 'clients_save_post' );