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get ACF image size URL by ID
// first, get the image ID returned by ACF
$image_id = get_field('my_image_field');
// and the image size you want to return
$image_size = 'thumbnail';
// use wp_get_attachment_image_src to return an array containing the image
// we'll pass in the $image_id in the first parameter
// and the image size registered using add_image_size() in the second
$image_array = wp_get_attachment_image_src($image_id, $image_size);
// finally, extract and store the URL from $image_array
$image_url = $image_array[0];
<img src="<?php echo $image_url; ?>" alt="">
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