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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 |
---|---|
2878 |
|
2879 | /** |
2880 | * Filters the ORDER BY clause of the query. |
2881 | * |
2882 | * @since 1.5.1 |
2883 | * |
2884 | * @param string $orderby The ORDER BY clause of the query. |
2885 | * @param WP_Query $query The WP_Query instance (passed by reference). |
2886 | */ |
2887 | $orderby = apply_filters_ref_array( 'posts_orderby', array( $orderby, &$this ) ); |
2888 |
|
2889 | /** |
2890 | * Filters the DISTINCT clause of the query. |
2891 | * |
2892 | * @since 2.1.0 |
2893 | * |
2894 | * @param string $distinct The DISTINCT clause of the query. |
2895 | * @param WP_Query $query The WP_Query instance (passed by reference). |
2896 | */ |