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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 2991 | * Filters the GROUP BY clause of the query. |
| 2992 | * |
| 2993 | * For use by caching plugins. |
| 2994 | * |
| 2995 | * @since 2.5.0 |
| 2996 | * |
| 2997 | * @param string $groupby The GROUP BY clause of the query. |
| 2998 | * @param WP_Query $query The WP_Query instance (passed by reference). |
| 2999 | */ |
| 3000 | $groupby = apply_filters_ref_array( 'posts_groupby_request', array( $groupby, &$this ) ); |
| 3001 | |
| 3002 | /** |
| 3003 | * Filters the JOIN clause of the query. |
| 3004 | * |
| 3005 | * For use by caching plugins. |
| 3006 | * |
| 3007 | * @since 2.5.0 |
| 3008 | * |
| 3009 | * @param string $join The JOIN clause of the query. |