Without comments, a website is as effective at creating a community as the Chicago Cubs are at winning World Series titles. WordPress 4.4 is a rebuilding release and the comments system is much improved under the hood. This release lays the groundwork for future features and improvements. A New Classy and Strong Comment Object The new WP_Comment class provides a single organized comment object that models its row in $wpdb->comments. You may be familiar with this approach from WP_Post, which inspired the caching implementation used in WP_Comment. This was a prerequisite to many of the other comment-related bug fixes and features added in 4.4. The WP_Comment class is marked final to retain flexibility while it is young. See #32619. Comment Queries for the Whole Family WP_Comment_Query has new query parameters for traversing your comments family tree. parent__in takes an array of comment parent IDs to return all matching children. parent__not_in takes an array of comment parent IDs and does not return any matching children. hierarchical can be set to either threaded, flat, or false. threaded returns a tree for matched comments, with the children for each comment included in its children
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