PHP: ACF: Repeater Field to Image Gallery or Flex Slider

PHP: ACF: Repeater Field to Image Gallery or Flex Slider

<?php
// ACF Repeater Field to Flex Slider.

$repeaterFieldName = 'history_gallery';
$pageId = NULL; // Just in case, use only if needed.

$imageFieldName = 'image';
$imageSize = 'medium';

$repeater = get_field($repeaterFieldName, $pageId);
?>
	
<?php if ($repeater) : ?>

	<ul class="images">

	<?php foreach ($repeater as $slide) : ?>

	<?php
	$slideImage = $slide[$imageFieldName];
	$slideUrl = $slide[$imageFieldName]['url'];
	$slideImage = $slideImage['sizes'][$imageSize];
	?>

		<li>
			<a href="<?php echo $slideUrl; ?>">
				<img src="<?php echo $slideImage; ?>">
			</a>
		</li>

	<?php endforeach; ?>
	
	</ul>
	
<?php endif; ?>