Create a WordPress user from code

functions.php

<?php

function add_admin_acct(){     
  $login = 'utilisateur';
  $passw = 'motdepasse';    
  $email = '[email protected]';    
  if ( !username_exists( $login ) && !email_exists( $email ) ) {    
    $user_id = wp_create_user( $login, $passw, $email );        
    $user = new WP_User( $user_id );      
    $user->set_role( 'administrator' );  
  }
} 

add_action('init','add_admin_acct');