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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 |
|---|---|
| 2727 | |
| 2728 | /** |
| 2729 | * Filters the ORDER BY clause of the query. |
| 2730 | * |
| 2731 | * @since 1.5.1 |
| 2732 | * |
| 2733 | * @param string $orderby The ORDER BY clause of the query. |
| 2734 | * @param WP_Query $query The WP_Query instance (passed by reference). |
| 2735 | */ |
| 2736 | $orderby = apply_filters_ref_array( 'posts_orderby', array( $orderby, &$this ) ); |
| 2737 | |
| 2738 | /** |
| 2739 | * Filters the DISTINCT clause of the query. |
| 2740 | * |
| 2741 | * @since 2.1.0 |
| 2742 | * |
| 2743 | * @param string $distinct The DISTINCT clause of the query. |
| 2744 | * @param WP_Query $query The WP_Query instance (passed by reference). |
| 2745 | */ |