$imageUrl = "";
            if (has_post_thumbnail( get_the_ID() ) ){
                $image = wp_get_attachment_image_src( get_post_thumbnail_id( get_the_ID() ), 'medium' );
                $imageUrl = $image[0];
            }
            else {
                $imageUrl = get_template_directory_uri()."/img/placeholder.png";
            }