CODE EXAMPLE FOR PHP

acf gallery

<?php 
$images = get_field('gallery');
if( $images ): ?>
    <ul>
        <?php foreach( $images as $image ): ?>
            <li>
                <a href="<?php echo esc_url($image['url']); ?>">
                     <img src="<?php echo esc_url($image['sizes']['thumbnail']); ?>" alt="<?php echo esc_attr($image['alt']); ?>" />
                </a>
                <p><?php echo esc_html($image['caption']); ?></p>
            </li>
        <?php endforeach; ?>
    </ul>
<?php endif; ?>