';
while (have_posts()) :
the_post();
/**
* 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([
'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;
}
}
$k++;
// If there is more than 1 attachment in a gallery
if (count($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();
}
echo '
'; // blog-post
if (comments_open() || '0' != get_comments_number()) {
comments_template();
}
endwhile;
echo '