Code zum Artikel "Multisite Language Switcher ins Menü einbauen" Part 1

menu-msls-1.php

<?php

function my_custom_menu_item( $items, $args ) {
    if ( class_exists( 'MslsOutput' ) && 'primary-nav' == $args->theme_location ) {
        $obj  = new MslsOutput;
        foreach ( $obj->get( 0 ) as $item ) {
            $items .= '<li>' . $item . '</li>';
        }
    }
    return $items;
}
add_filter( 'wp_nav_menu_items', 'my_custom_menu_item', 10, 2 );