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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 |
|---|---|
| 2864 | |
| 2865 | /** |
| 2866 | * Filter the ORDER BY used when ordering search results. |
| 2867 | * |
| 2868 | * @since 3.7.0 |
| 2869 | * |
| 2870 | * @param string $search_orderby The ORDER BY clause. |
| 2871 | * @param WP_Query $this The current WP_Query instance. |
| 2872 | */ |
| 2873 | $search_orderby = apply_filters( 'posts_search_orderby', $search_orderby, $this ); |
| 2874 | if ( $search_orderby ) |
| 2875 | $orderby = $orderby ? $search_orderby . ', ' . $orderby : $search_orderby; |
| 2876 | } |
| 2877 | |
| 2878 | if ( is_array( $post_type ) && count( $post_type ) > 1 ) { |
| 2879 | $post_type_cap = 'multiple_post_type'; |
| 2880 | } else { |
| 2881 | if ( is_array( $post_type ) ) |
| 2882 | $post_type = reset( $post_type ); |