Filters the GROUP BY clause of the query.

For use by caching plugins.

$groupby string

The GROUP BY clause of the query.

$query WP_Query

The WP_Query instance (passed by reference).

File: wp-includes/class-wp-query.php. View all references

$groupby = apply_filters_ref_array( 'posts_groupby_request', array( $groupby, &$this ) );