WordPress 5.1 introduced the compare_key parameter for WP_Meta_Query, allowing developers to perform LIKE queries against postmeta keys. (See #42409 and the related dev note.) WordPress 5.3 expands the options available to compare_key, so that developers have access to meta-key comparison operators similar to those available for meta values. See #43446 and [46188]. After this change, … Continue reading Expanded meta key comparison operators in 5.3