ACF :: Repeater field w/Fancybox Repeater field w/ Parent Image, Gallery Images & Caption

ACF Repeater Gallery with Repeater.php

<?php
if(get_field('gallery')):
	echo '<div class="gallery__images">';
 
    $i == 0;
	while(has_sub_field('gallery')):
		$i++;
		$parent_image = get_sub_field('parent_image');
        echo '<div class="gallery_inner_image">';
			echo '<div class="holder">';
				echo '<a class="fancybox" rel="group'.$i.'" href="'.$parent_image['url'].'">';
					echo '<img src="' . $parent_image['sizes']['gallery-thumb'] . '" alt="' . $parent_image['alt'] . '" />';
				echo '</a>';
			echo '</div>';
			echo '<div class="gallery__caption">'.get_sub_field('caption').'</div>';
 
	        if(get_sub_field('gallery_images')):
	        	while(has_sub_field('gallery_images')):
                echo '<a class="fancybox" rel="group'.$i.'" href="';
                echo get_sub_field('gallery_image')['sizes']['large'];
                echo '" /></a>';
                endwhile;
            endif;
        echo '</div>';
	endwhile;
 
	echo '</div>';
endif;
?>