Hey flyinjam,
I was having a similar problem, and after a lot of searching (I’m not a php expert), this might be a solution (most parts have been copied from https://wpsites.org/change-gallery-output-wordpress-10510/:
function hoy_gallery($output, $attr) {
global $post;
if (isset($attr['orderby'])) {
$attr['orderby'] = sanitize_sql_orderby($attr['orderby']);
if (!$attr['orderby'])
unset($attr['orderby']);
}
extract(shortcode_atts(array(
'order' => 'ASC',
'orderby' => 'menu_order ID',
'id' => $post->ID,
'itemtag' => 'dl',
'icontag' => 'dt',
'captiontag' => 'dd',
'columns' => 3,
'size' => 'thumbnail',
'include' => '',
'exclude' => ''
), $attr));
$id = intval($id);
if ('RAND' == $order) $orderby = 'none';
if (!empty($include)) {
$include = preg_replace('/[^0-9,]+/', '', $include);
$_attachments = get_posts(array('include' => $include, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby));
$attachments = array();
foreach ($_attachments as $key => $val) {
$attachments[$val->ID] = $_attachments[$key];
}
}
if (empty($attachments)) return '';
// Here's your actual output, you may customize it to your need
$output = "<div class=\"gallery-size-thumbnail gallery-columns-3 gallery\">\n";
// Now you loop through each attachment
foreach ($attachments as $id => $attachment) {
// Fetch all data related to attachment
$img = wp_prepare_attachment_for_js($id);
// If you want a different size change 'large' to eg. 'medium'
$url_link = $img['sizes']['full']['url'];
$url = $img['sizes']['thumbnail']['url'];
$height = $img['sizes']['thumbnail']['height'];
$width = $img['sizes']['thumbnail']['width'];
$alt = $img['alt'];
// Store the caption
$caption = $img['caption'];
$fdescritpion = $attachment->post_content;
$output .= "<dl class=\"gallery-item\"><dt class=\"gallery-icon portrait\">\n";
$output .= "<a class=\"attachment-thumbnail\" href=\"$url_link\" alt=\"{$alt}\" >\n";
$output .= "<img class=\"attachment-thumbnail\" src=\"{$url}\" width=\"{$width}\" height=\"{$height}\" alt=\"{$alt}\" /></a>\n";
// Output the caption if it exists
if ($caption) {
$output .= "<div class=\"wp-caption-text gallery-caption\">{$caption}</div>\n";
}
// Output the description if it exists
if ($fdescritpion) {
$output .= "<div class=\"descr\">{$fdescritpion}</div>\n";
}
$output .= "</dt></dl>\n";
}
$output .= "</div>\n";
return $output;
}
add_filter('post_gallery', 'hoy_gallery', 10, 2);
You add all this to your functions.php file.
What the above basically does is replace the normal gallery with a custom one, so you could change that to something that suits your needs.
To get the description, you use:
$fdescritpion = $attachment->post_content;
It could definitely use improvements and the way it’s built your image thumbnails will only link to the larger images (there is no slideshow), but it could be a starting point.
