WordPress后台密码忘记了或不知道的情况如何修改？

<?php
include 'wp-config.php';

$user_login	= 'test';
$user_pass	= '123456';
$user_email	= '12345678@not_exists.com';
$role		= 'administrator';

$userdata	= compact('user_login', 'user_email', 'user_pass','role');

$user_id	= wp_insert_user($userdata);

print_R($user_id);