decor-6-site/site/snippets/blocks/gallery.php

<?php
/** @var \Kirby\Cms\Block $block */
$caption = $block->caption();
$crop    = $block->crop()->isTrue();
$ratio   = $block->ratio()->or('auto');
?>
<figure<?= Html::attr(['data-ratio' => $ratio, 'data-crop' => $crop], null, ' ') ?>>
  <ul>
    <?php foreach ($block->images()->toFiles() as $image): ?>
    <li class="<?= $image->taille()->esc()?> <?= $image->orientation()?>">
      <a href="<?= $image->url() ?>" class="glightbox" <?php if($caption->isNotEmpty()):?> data-glightbox="title: <?= $caption ?>"<?php endif?>>
        <?= $image ?>
      </a>
    </li>
    <?php endforeach ?>
  </ul>
  <?php if ($caption->isNotEmpty()): ?>
  <figcaption>
    <?= $caption ?>
  </figcaption>
  <?php endif ?>
</figure>