posts_groupby_request │ filter-hook │ WP 2.5.0

Filters the GROUP BY clause of the query.

For use by caching plugins.

Usage

add_filter( 'posts_groupby_request', 'wp_kama_posts_groupby_request_filter', 10, 2 );

/**
 * Function for `posts_groupby_request` filter-hook.
 * 
 * @param string   $groupby The GROUP BY clause of the query.
 * @param WP_Query $query   The WP_Query instance (passed by reference).
 *
 * @return string
 */
function wp_kama_posts_groupby_request_filter( $groupby, $query ){

	// filter...
	return $groupby;
}

$groupby(string)

The GROUP BY clause of the query.

$query(WP_Query)

The WP_Query instance (passed by reference).

Changelog

Where the hook is called

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

Where the hook is used in WordPress