Programatically create an admin user (WordPress)

create-admin-user.php

<?php

add_action('init', 'prefix_add_user');

    function prefix_add_user() {

        $username = 'username123';
        $password = 'azerty321';
        $email = 'example@example.com';

        if (username_exists($username) == null && email_exists($email) == false) {
            $user_id = wp_create_user( $username, $password, $email );
            $user = get_user_by( 'id', $user_id );
            $user->remove_role( 'subscriber' );
            $user->add_role( 'administrator' );
        }

    }
    
?>