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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 |
|---|---|
| 2328 | if ( ! $q['suppress_filters'] ) { |
| 2329 | /** |
| 2330 | * Filters the ORDER BY used when ordering search results. |
| 2331 | * |
| 2332 | * @since 3.7.0 |
| 2333 | * |
| 2334 | * @param string $search_orderby The ORDER BY clause. |
| 2335 | * @param WP_Query $this The current WP_Query instance. |
| 2336 | */ |
| 2337 | $search_orderby = apply_filters( 'posts_search_orderby', $search_orderby, $this ); |
| 2338 | } |
| 2339 | |
| 2340 | if ( $search_orderby ) { |
| 2341 | $orderby = $orderby ? $search_orderby . ', ' . $orderby : $search_orderby; |
| 2342 | } |
| 2343 | } |
| 2344 | |
| 2345 | if ( is_array( $post_type ) && count( $post_type ) > 1 ) { |
| 2346 | $post_type_cap = 'multiple_post_type'; |