posts_join WordPress Filter Hook
The posts_join hook is one of the most useful hooks in WordPress. It allows you to join multiple posts together into a single post. This is especially useful for creating custom post types or for joining together posts from different parts of your site.
apply_filters_ref_array( 'posts_join', string $join , WP_Query $query ) #
Filters the JOIN clause of the query.
Parameters
More Information
When you use the wp_query object to run a query, not all tables are queried by default. For example, a query on the blog archive will only query the posts table. If you wanted to display posts that have specific meta value you will have to alter the wp_query object to include the required meta key.
Source
Changelog
| Version | Description |
|---|---|
| 1.5.0 | Introduced. |