disable user registration from wp-login screen

function.php

<?php
add_action( 'login_head', 'hide_login_nav' );

 function hide_login_nav()
{
    ?><style>#backtoblog{display:none}</style><?php
}

/**
* remove the register link from the wp-login.php script
*/
add_filter('option_users_can_register', function($value) {
    $script = basename(parse_url($_SERVER['SCRIPT_NAME'], PHP_URL_PATH));
 
    if ($script == 'wp-login.php') {
        $value = false;
    }
 
    return $value;
});