Use an ACF Image When There Is No Featured Image
Makes WordPress treat an ACF image field as the featured image for posts that have none, so archives, related posts and social previews still get a picture.
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Validate Phone Numbers in an ACF Field
Checks a phone number field when a post is saved and shows an error unless it has 7 to 15 digits, optionally with +, spaces, dashes and brackets.
Word Limit for an ACF Text Area
Shows an error when a text area or WYSIWYG field goes over a set number of words, which keeps summaries and teasers short.