WooCommerce - Complex price suffixes

<?php
  // WooCommerce - Complex price suffixes
  add_filter('woocommerce_get_price_suffix', 'custom_get_price_suffix', 90, 4 );
  function custom_get_price_suffix( $html, $product, $price, $qty ) {
    if ( ! $html && $product instanceof WC_Product_Variable ) {
      // copied from woocommerce/includes/abstracts/abstract-wc-product.php#get_price_suffix
      if ( ( $suffix = get_option( 'woocommerce_price_display_suffix' ) ) && wc_tax_enabled() && 'taxable' === $product->get_tax_status() ) {
        $replacements = array(
         '{price_including_tax}' => wc_price( wc_get_price_including_tax( $product, array( 'qty' => $qty, 'price' => $price ) ) ),
         '{price_excluding_tax}' => wc_price( wc_get_price_excluding_tax( $product, array( 'qty' => $qty, 'price' => $price ) ) ),
        );
        $html = str_replace( array_keys( $replacements ), array_values( $replacements ), ' <small class="woocommerce-price-suffix">' . wp_kses_post( $suffix ) . '</small>' );
      }
    }
    return $html;
  } // end function