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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 |
|---|---|
| 2677 | |
| 2678 | /** |
| 2679 | * Filters the GROUP BY clause of the query. |
| 2680 | * |
| 2681 | * @since 2.0.0 |
| 2682 | * |
| 2683 | * @param string $groupby The GROUP BY clause of the query. |
| 2684 | * @param WP_Query $this The WP_Query instance (passed by reference). |
| 2685 | */ |
| 2686 | $groupby = apply_filters_ref_array( 'posts_groupby', array( $groupby, &$this ) ); |
| 2687 | |
| 2688 | /** |
| 2689 | * Filters the JOIN clause of the query. |
| 2690 | * |
| 2691 | * Specifically for manipulating paging queries. |
| 2692 | * |
| 2693 | * @since 1.5.0 |
| 2694 | * |
| 2695 | * @param string $join The JOIN clause of the query. |