Portfolio Loop

<?php
/**
 * The loop to show posts in columns
 * loop-grid.php
 * Grid style page template with Nivo Slider
 */
?>

<?php /* Start the Loop */ ?>

<?php $num_cols = 4; // set the number of columns here

for ( $i=1 ; $i <= $num_cols; $i++ ) :
    echo '<div class="column col-' . $i . '" >';
    $counter = $num_cols + 1 - $i; ?>

<?php while (have_posts()) : the_post();
    if( $counter%$num_cols == 0 ) :

// begin of core posts output ?>

    <article id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
        <header class="entry-header">
            <h1 class="entry-title">
                <a href="<?php the_permalink(); ?>" title="<?php echo esc_attr( sprintf( __( 'Permalink to %s', 'twentytwelve' ), the_title_attribute( 'echo=0' ) ) ); ?>" rel="bookmark"><?php the_title(); ?></a>
            </h1>
        </header><!-- .entry-header -->

        <div class="portfolio-thumb">
            <a href="<?php the_permalink(); ?>" title="<?php printf( esc_attr__( 'Permalink to %s', 'twentyetwelve' ), the_title_attribute( 'echo=0' ) ); ?>" rel="bookmark"><?php the_post_thumbnail('portfolio-thumbnail', 'class=alignleft'); ?></a>
        </div>

        <div class="entry-summary">
            <?php echo get_the_portfolio_excerpt(); ?>
        </div><!-- .entry-summary -->
    </article><!-- #post -->

    <?php //end of posts output

    endif; $counter++;
        endwhile;
            rewind_posts();
        echo '</div>'; //closes the column div
    endfor; ?>

    <?php /* Display navigation or wp-PageNavi if installed */ ?>
        <?php if (  $wp_query->max_num_pages > 1 || get_query_var('page')) : ?>
            <?php twentytwelve_content_nav( 'nav-below' ); ?>
        <?php endif;
        wp_reset_query(); ?>