post_parent ) { /** * Grab the IDs of all the image attachments in a gallery so we can get the URL of the next adjacent image in a gallery, * or the first image (if we're looking at the last image in a gallery), or, in a gallery of one, just the link to that image file */ $attachments = array_values( get_children( array( 'post_parent' => $post->post_parent, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => 'ASC', 'orderby' => 'menu_order ID' ) ) ); foreach ( $attachments as $k => $attachment ) : if ( $attachment->ID == $post->ID ) break; endforeach; $k++; // If there is more than 1 attachment in a gallery if ( count( $attachments ) > 1 ) : if ( isset( $attachments[ $k ] ) ) // get the URL of the next image attachment $next_attachment_url = get_attachment_link( $attachments[ $k ]->ID ); else // or get the URL of the first image attachment $next_attachment_url = get_attachment_link( $attachments[ 0 ]->ID ); else : // or, if there's only 1 image, get the URL of the image $next_attachment_url = wp_get_attachment_url(); endif; } ?> ID, $attachment_size ); ?>