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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 |
|---|---|
| 2779 | * Filters the WHERE clause of the query. |
| 2780 | * |
| 2781 | * For use by caching plugins. |
| 2782 | * |
| 2783 | * @since 2.5.0 |
| 2784 | * |
| 2785 | * @param string $where The WHERE clause of the query. |
| 2786 | * @param WP_Query $this The WP_Query instance (passed by reference). |
| 2787 | */ |
| 2788 | $where = apply_filters_ref_array( 'posts_where_request', array( $where, &$this ) ); |
| 2789 | |
| 2790 | /** |
| 2791 | * Filters the GROUP BY clause of the query. |
| 2792 | * |
| 2793 | * For use by caching plugins. |
| 2794 | * |
| 2795 | * @since 2.5.0 |
| 2796 | * |
| 2797 | * @param string $groupby The GROUP BY clause of the query. |