Portfolio Category Page

<?php get_header(); ?>

    <div class="centered-wrapper">

        <div class="page-title-subtitle">
            <h2><?php _e('Category: ', 'delicious'); ?><strong><?php single_cat_title(); ?></strong></h2>
            <?php
                $categ_desc = category_description( get_the_category( $id ) );

                if($categ_desc != '') {
                ?>
                    <h3><?php echo $categ_desc ?> </h3>
                <?php } ?>
        </div>

        <section class="patti-grid" id="gridwrapper_portfolio">
            <section id="portfolio-wrapper">
                <ul class="portfolio grid isotope grid_portfolio">

                    <?php
                    // Begin The Loop
                    if (have_posts()) : while (have_posts()) : the_post();

                    $portf_thumbnail = get_post_meta($post->ID,'dt_portf_thumbnail',true);
                    $item_class = 'item-small';

                    $thumb_id = get_post_thumbnail_id($post->ID);
                    $image_url = wp_get_attachment_url($thumb_id);

                    switch ($portf_thumbnail) {
                        case 'portfolio-big':
                            $grid_thumbnail = aq_resize($image_url, 566, 440, true);
                            $item_class = 'item-wide';
                            break;
                        case 'portfolio-small':
                            $grid_thumbnail = aq_resize($image_url, 281, 219, true);
                            $item_class = 'item-small';
                            break;
                        case 'half-horizontal':
                            $grid_thumbnail = aq_resize($image_url, 566, 219, true);
                            $item_class = 'item-long';
                            break;
                        case 'half-vertical':
                            $grid_thumbnail = aq_resize($image_url, 281, 440, true);
                            $item_class = 'item-high';
                            break;
                    }

                    $terms = get_the_terms( get_the_ID(), 'portfolio_cats' );

                    ?>
                    <li class="grid-item <?php echo $item_class; ?>">
                        <a href="<?php the_permalink(); ?>">
                            <div class="grid-item-on-hover">
                                <div class="grid-text">
                                    <h1><?php echo get_the_title(); ?></h1>
                                </div>
                                <span>
                                <?php
                                    $copy = $terms;
                                    foreach ( $terms as $term ) {
                                       echo $term->name;
                                        if (next($copy )) {
                                            echo ', ';
                                        }
                                    }
                                ?>
                                </span>
                            </div>
                            <img src="<?php echo $grid_thumbnail; ?>" alt="" />
                        </a>
                    </li>


                    <?php endwhile; endif; // END the Wordpress Loop ?>
                </ul>
                <?php dt_navigation(); ?>

            </section>
        </section>
    </div><!--end centered-wrapper-->
<?php get_footer(); ?>