product gallery attachment url in woocommerce

I have changed 'thumbnail_size' to 'large' added global $post; and changed .wp_get_attachment_image_src( $attachment_id, 'large')..

The $post will need to be decalered globaly to access it's contents since this is outside "the loop".

EDIT 2 I've updated the code below so it should link to the image clicked. Removed $thumb and $url as it's not being used.

<?phpglobal $product;global $post;$attachment_ids = $product->get_gallery_attachment_ids();echo '<div>';foreach( $attachment_ids as $attachment_id ) {    echo '<a href="' .wp_get_attachment_image_src( $attachment_id, 'large'). '" rel="shadowbox" >' ."<img src=".wp_get_attachment_image_src( $attachment_id, 'large')." style='width:70px; height:70px;' >". '</a>';}echo '</div>';?>

Hope this will help you

  global $product;     $attachment_ids = $product->get_gallery_attachment_ids();    foreach( $attachment_ids as $attachment_id )     {      //Get URL of Gallery Images - default wordpress image sizes      echo $Original_image_url = wp_get_attachment_url( $attachment_id );      echo $full_url = wp_get_attachment_image_src( $attachment_id, 'full' )[0];      echo $medium_url = wp_get_attachment_image_src( $attachment_id, 'medium' )[0];      echo $thumbnail_url = wp_get_attachment_image_src( $attachment_id, 'thumbnail' )[0];      //Get URL of Gallery Images - WooCommerce specific image sizes      echo $shop_thumbnail_image_url = wp_get_attachment_image_src( $attachment_id, 'shop_thumbnail' )[0];      echo $shop_catalog_image_url = wp_get_attachment_image_src( $attachment_id, 'shop_catalog' )[0];      echo $shop_single_image_url = wp_get_attachment_image_src( $attachment_id, 'shop_single' )[0];      //echo Image instead of URL      echo wp_get_attachment_image($attachment_id, 'full');      echo wp_get_attachment_image($attachment_id, 'medium');      echo wp_get_attachment_image($attachment_id, 'thumbnail');      echo wp_get_attachment_image($attachment_id, 'shop_thumbnail');      echo wp_get_attachment_image($attachment_id, 'shop_catalog');      echo wp_get_attachment_image($attachment_id, 'shop_single');    }