[wordpress] Generate unique user name

gistfile1.php

<?php 

function generate_username( $username ){
    return username_exists($username) 
    	   ? admin_theme_user_manager::generate_username( 
    	   		$username.mt_rand(1, 9)
    	   				 .mt_rand(1, 9)
    	   				 .mt_rand(1, 9)
    	   				 .mt_rand(1, 9)
			)
    	   : $username ;
  }


generate_username($username);
wp_generate_password(5, false);