Add Admin User to Functions.php when you have only ftp access in wordpress

Here’s how to add administrator user using functions.php when you have no clue if what is the username or email registered in the wordpress and you have only ftp access.

Solutions:
1. Add this to your functions.php

$admintemp= array('user_login' => 'tempadmin','user_pass' => 'yourpassword','user_email' => 'your@email.com','role' => 'administrator');
var_dump(wp_insert_user($admintemp));

2. Remove after you change the email or password of your original username used.