Adding Brand Archive Link to Single Product Summary in WooCommerce

functions.php

<?php
add_action( 'woocommerce_single_product_summary', 'add_brand_to_single_product_summary', 6 );
function add_brand_to_single_product_summary() {

	global $post;

	if ( ! $post_id && ! $post )
		return;
	if ( ! $post_id )
		$post_id = $post->ID;
	
	$brands = wp_get_post_terms( $post_id, 'product_brand', array( "fields" => "ids" ) );
	
	$output = null;
	if ( count( $brands ) > 0 ) {
		ob_start();
		foreach( $brands as $brand ) {
			
			$term = get_term_by( 'id', $brand, 'product_brand' );
			echo '<p class="produkt-brand"><a href="' . get_term_link( $term,  'product_brand' ) . '">' . $term->name . '</a></p>';

		}
		$output = ob_get_clean();
	}
	echo $output;
}