I need very simple url rewrite, e.g. rewrite /admin to /wp-login.php and i do NOT want to use .htaccess but just functions.php.
I have tried
add_action('init', 'mc_admin_url');
function mc_admin_url() {
add_rewrite_rule('admin', 'wp-login.php','top');
}
and many other variants with slashes at the begining etc. but nothing seem to work. Can anyone help me?