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I am using advanced custom fields repeater-field to get the image url like this:

<?php the_sub_field('billede'); ?>

But I also want to get the attachment ID for the image, to be used for something else.

Is this possible? :)

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The simplest way to do this is to change your field to return attachment ID instead of URL, and then when you need the URL, use wp_get_attachment_image_src with the ID. The only method I'm aware of to get ID from URL is with a custom SQL query.

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