Nth iteration for wordpress while loop - wordpress

Question

I know it is little easy but unable to solve the issue with wordpress while loop. I am using zurb framework and for product list using below html structure.
<div class="row">
<div class="four columns">
item here
</div>
<div class="four columns">
item here
</div>
<div class="four columns">
item here
</div>
</div>
So in while loop I want to repeat entire structure after every three four columns div. I have tried with below code
<?php
$temp = $wp_query;
$wp_query = null;
$wp_query = new WP_Query();
$wp_query->query('post_type=product' . '&paged=' . $paged .'');
?>
<?php $counter = 0;
if ( have_posts() ) : while ( have_posts() ) : the_post();
if ($counter % 3 == 0):
echo '<div class="row"><!--row starts here-->';
endif; ?>
<div class="four columns">
<article>
<header>
<hgroup>
<h2><?php the_title(); ?></h2>
<h6>Written by <?php the_author_link(); ?> on <?php the_time(get_option('date_format')); ?></h6>
</hgroup>
</header>
<?php if ( has_post_thumbnail()) : ?>
<a href="<?php the_permalink(); ?>" class="th" title="<?php the_title_attribute(); ?>" ><?php the_post_thumbnail(); ?></a>
<?php endif; ?>
<?php the_excerpt(); ?>
</article>
</div>
<?php endwhile; ?>
<?php else : ?>
<h2><?php _e('No posts.', 'foundation' ); ?></h2>
<p class="lead"><?php _e('Sorry about this, I couldn\'t seem to find what you were looking for.', 'foundation' ); ?></p>
<?php endif;
if ($counter % 3 == 0):
echo '</div><!--row end here-->';
endif; ?>
<?php foundation_pagination(); ?>
</div>
<!-- End Main Content -->
But it is repeating wrongly and for every loop. I know this is obvious to repeat but the solution I unable to found how to repeat after only 3 four columns and in first loop row should div should be inserted as well.
Thanks a lot

Answer 1

Do precisely what Andy said, add the code $counter++; in your code, inside the while loop.
For example, in your code:
</div>
<?php $counter++; ?>
<?php endwhile; ?>
That shows where to put it between two existing lines in your example.

Answer 2

You should probably add one to the counter in the loop, like $counter++, then close this question.