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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 |
|---|---|
| 2909 | |
| 2910 | /** |
| 2911 | * Filter the ORDER BY used when ordering search results. |
| 2912 | * |
| 2913 | * @since 3.7.0 |
| 2914 | * |
| 2915 | * @param string $search_orderby The ORDER BY clause. |
| 2916 | * @param WP_Query $this The current WP_Query instance. |
| 2917 | */ |
| 2918 | $search_orderby = apply_filters( 'posts_search_orderby', $search_orderby, $this ); |
| 2919 | if ( $search_orderby ) |
| 2920 | $orderby = $orderby ? $search_orderby . ', ' . $orderby : $search_orderby; |
| 2921 | } |
| 2922 | |
| 2923 | if ( is_array( $post_type ) && count( $post_type ) > 1 ) { |
| 2924 | $post_type_cap = 'multiple_post_type'; |
| 2925 | } else { |
| 2926 | if ( is_array( $post_type ) ) |
| 2927 | $post_type = reset( $post_type ); |