[WooCommerce] Cart Total Shortcode

functions.php

<?php
// Allow shortcode in nav items
add_filter('wp_nav_menu_items', 'do_shortcode');

// [cart-total]
add_shortcode( 'cart-total', 'ching_shortcode_woo_cart_total' );
function ching_shortcode_woo_cart_total(){
    $total        = WC()->cart->total;    
    return '<span>'.wc_price($subtotal).'</span>';
}