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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 |
|---|---|
| 2647 | * Filters the GROUP BY clause of the query. |
| 2648 | * |
| 2649 | * For use by caching plugins. |
| 2650 | * |
| 2651 | * @since 2.5.0 |
| 2652 | * |
| 2653 | * @param string $groupby The GROUP BY clause of the query. |
| 2654 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 2655 | */ |
| 2656 | $groupby = apply_filters_ref_array( 'posts_groupby_request', array( $groupby, &$this ) ); |
| 2657 | |
| 2658 | /** |
| 2659 | * Filters the JOIN clause of the query. |
| 2660 | * |
| 2661 | * For use by caching plugins. |
| 2662 | * |
| 2663 | * @since 2.5.0 |
| 2664 | * |
| 2665 | * @param string $join The JOIN clause of the query. |