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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 |
|---|---|
| 2479 | if ( ! $q['suppress_filters'] ) { |
| 2480 | /** |
| 2481 | * Filters the ORDER BY used when ordering search results. |
| 2482 | * |
| 2483 | * @since 3.7.0 |
| 2484 | * |
| 2485 | * @param string $search_orderby The ORDER BY clause. |
| 2486 | * @param WP_Query $query The current WP_Query instance. |
| 2487 | */ |
| 2488 | $search_orderby = apply_filters( 'posts_search_orderby', $search_orderby, $this ); |
| 2489 | } |
| 2490 | |
| 2491 | if ( $search_orderby ) { |
| 2492 | $orderby = $orderby ? $search_orderby . ', ' . $orderby : $search_orderby; |
| 2493 | } |
| 2494 | } |
| 2495 | |
| 2496 | if ( is_array( $post_type ) && count( $post_type ) > 1 ) { |
| 2497 | $post_type_cap = 'multiple_post_type'; |