title: Appending a class attribute to woocommerce single product image
body: <pre><code> - $image_title         = esc_attr( get_the_title( get_post_thumbnail_id() ) );
              $image_link         = wp_get_attachment_url( get_post_thumbnail_id() );
              $image              = get_the_post_thumbnail( $post-&gt;ID, apply_filters( 'single_product_large_thumbnail_size', 'shop_single' ), array(
                  'title' =&gt; $image_title
                  ) );
              $attachment_count   = count( $product-&gt;get_gallery_attachment_ids() );
  
              if ( $attachment_count &gt; 0 ) {
                  $gallery = '[product-gallery]';
              } else {
                  $gallery = '';
              }
  
              echo apply_filters( 'woocommerce_single_product_image_html', sprintf( '&lt;a href="%s" itemprop="image" class="woocommerce-main-image zoom" title="%s"  rel="prettyPhoto' . $gallery . '"&gt;%s&lt;/a&gt;', $image_link, $image_title, $image ), $post-&gt;ID );
  </code></pre>
  
  <p>Above is the code from product-image.php file of woocommerce. I want to add a class to the image of single product. I am unable to find out the way for it. Please help. </p>
  
  <p>Thanks</p>