Loop Product Categories

<?php $c = 1; ?>
            <?php foreach ($product -> categories as $category_id) : ?>
                <?php $wpcoDb -> model = $Category -> model; ?>
                <?php if ($category = $wpcoDb -> find(array('id' => $category_id))) : ?>
                    <a href="<?php echo get_permalink($category -> post_id); ?>" title="<?php echo $category -> title; ?>"><?php echo $category -> title; ?></a>
                    <?php echo ($c < count($product -> categories)) ? ', ' : ''; ?>
                <?php endif; ?>
                <?php $c++; ?>
            <?php endforeach; ?>