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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 |
---|---|
2791 | * Filters the ORDER BY clause of the query. |
2792 | * |
2793 | * For use by caching plugins. |
2794 | * |
2795 | * @since 2.5.0 |
2796 | * |
2797 | * @param string $orderby The ORDER BY clause of the query. |
2798 | * @param WP_Query $this The WP_Query instance (passed by reference). |
2799 | */ |
2800 | $orderby = apply_filters_ref_array( 'posts_orderby_request', array( $orderby, &$this ) ); |
2801 |
|
2802 | /** |
2803 | * Filters the DISTINCT clause of the query. |
2804 | * |
2805 | * For use by caching plugins. |
2806 | * |
2807 | * @since 2.5.0 |
2808 | * |
2809 | * @param string $distinct The DISTINCT clause of the query. |