WordPress: Make nav menu items appear randomly

wp-nav-menu-objects-random.php

<?php
// You must add a class "random" to each nav menu item you wish to be randomized
add_filter( 'wp_nav_menu_objects', 'random_menu_items', 10, 2 );
function random_menu_items( $menu, $args ) {
	$shuffle_array = array();
	foreach ( $menu as $key => $item ) { // Loop through the menu items
		if ( in_array( 'random', $item->classes ) ) { // See if this menu item has class "random"
			$shuffle_array[] = $menu[ $key ]; // Put menu item into new array to be randomized
			unset( $menu[ $key ] ); // Remove this from the main menu array
		}
	}
	if ( !empty( $shuffle_array ) ) { // If we find any menu items to be randomized
		shuffle( $shuffle_array ); // Do the randomization of the selected menu items
		$menu = array_merge( $menu, $shuffle_array ); // Merge the two arrays together
	}
	return $menu;
}
?>