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By default when a user is logged in, a 'logged-in' classname is appended to the body tag. I need to append something like 'guest-user' to the body to output different styling based on whether or not the user is logged in.

How can I achieve this? Something maybe I could put in my child theme's functions.php file?

Thanks.

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Yes, there's the body_class filter. You could use e.g.

function body_class_guest_user( $classes, $class ) {
    if ( ! is_user_logged_in() ) {
        $classes[] = 'guest-user';
    }
    return $classes;
}
add_filter( 'body_class', 'body_class_guest_user', 10, 2 );

However you could equally well just use the :not() selector, e.g. body:not(.logged-in) (browser support), or absence of logged-in i.e. set up the guest-user styling as default but then override it if .logged-in.

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