WP add admin user

wp-add-admin-user.php

<?php
$user     = '';
$email    = '';
$password = '';
$role     = 'administrator';

$user = get_user_by( 'email', $email );
if ( ! $user ) {
	wp_create_user( $user, $password, $email );
	$user = get_user_by( 'email', $email );
}
if ( $user ) {
	$user->add_role( $role );
	
	if ( is_multisite() ) {
		grant_super_admin( $user->ID );
		add_user_to_blog( get_current_blog_id(), $user->ID, $role );
	}
}