WooCommerce multicategory breadcrumb

<?php
/**
 * Shop breadcrumb
 *
 * @author 		WooThemes
 * @package 	WooCommerce/Templates
 * @version     2.3.0
 * @see         woocommerce_breadcrumb()
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

if ( $breadcrumb ) {

	echo $wrap_before;

	if ( is_single() && get_post_type() == 'product' ) {

		echo $prepend;

		if ( $terms = get_the_terms( $post->ID, 'product_cat' ) ) {

			$referer = wp_get_referer();
			foreach( $terms as $term){
				$referer_slug = (strpos($referer, $term->slug));

				if(!$referer_slug==false){
					$category_name = $term->name;
					$ancestors = get_ancestors( $term->term_id, 'product_cat' );
					$ancestors = array_reverse( $ancestors );

					foreach ( $ancestors as $ancestor ) {
   					$ancestor = get_term( $ancestor, 'product_cat' );

					if ( ! is_wp_error( $ancestor ) && $ancestor )
						echo $before . '<a href="' . get_term_link( $ancestor->slug, 'product_cat' ) . '">' . $ancestor->name . '</a>' . $after . $delimiter;
					}
					echo $before . '<a href="' . get_term_link( $term->slug, 'product_cat' ) . '">' . $category_name . '</a>' . $after . $delimiter;
				}
			}

		}

		echo $before . get_the_title() . $after;

	} else {

		foreach ( $breadcrumb as $key => $crumb ) {

			echo $before;

			if ( ! empty( $crumb[1] ) && sizeof( $breadcrumb ) !== $key + 1 ) {
				echo '<a href="' . esc_url( $crumb[1] ) . '">' . esc_html( $crumb[0] ) . '</a>';
			} else {
				echo esc_html( $crumb[0] );
			}

			echo $after;

			if ( sizeof( $breadcrumb ) !== $key + 1 ) {
				echo $delimiter;
			}

		}
	}

	echo $wrap_after;

}