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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 |
|---|---|
| 2643 | * Filters the WHERE clause of the query. |
| 2644 | * |
| 2645 | * Specifically for manipulating paging queries. |
| 2646 | * |
| 2647 | * @since 1.5.0 |
| 2648 | * |
| 2649 | * @param string $where The WHERE clause of the query. |
| 2650 | * @param WP_Query $this The WP_Query instance (passed by reference). |
| 2651 | */ |
| 2652 | $where = apply_filters_ref_array( 'posts_where_paged', array( $where, &$this ) ); |
| 2653 | |
| 2654 | /** |
| 2655 | * Filters the GROUP BY clause of the query. |
| 2656 | * |
| 2657 | * @since 2.0.0 |
| 2658 | * |
| 2659 | * @param string $groupby The GROUP BY clause of the query. |
| 2660 | * @param WP_Query $this The WP_Query instance (passed by reference). |
| 2661 | */ |