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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 |
|---|---|
| 3090 | |
| 3091 | /** |
| 3092 | * Filters the Post IDs SQL request before sending. |
| 3093 | * |
| 3094 | * @since 3.4.0 |
| 3095 | * |
| 3096 | * @param string $request The post ID request. |
| 3097 | * @param WP_Query $query The WP_Query instance. |
| 3098 | */ |
| 3099 | $this->request = apply_filters( 'posts_request_ids', $this->request, $this ); |
| 3100 | |
| 3101 | $ids = $wpdb->get_col( $this->request ); |
| 3102 | |
| 3103 | if ( $ids ) { |
| 3104 | $this->posts = $ids; |
| 3105 | $this->set_found_posts( $q, $limits ); |
| 3106 | _prime_post_caches( $ids, $q['update_post_term_cache'], $q['update_post_meta_cache'] ); |
| 3107 | } else { |
| 3108 | $this->posts = array(); |