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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 |
|---|---|
| 3346 | |
| 3347 | /** |
| 3348 | * Filters the Post IDs SQL request before sending. |
| 3349 | * |
| 3350 | * @since 3.4.0 |
| 3351 | * |
| 3352 | * @param string $request The post ID request. |
| 3353 | * @param WP_Query $query The WP_Query instance. |
| 3354 | */ |
| 3355 | $this->request = apply_filters( 'posts_request_ids', $this->request, $this ); |
| 3356 | |
| 3357 | $post_ids = $wpdb->get_col( $this->request ); |
| 3358 | |
| 3359 | if ( $post_ids ) { |
| 3360 | $this->posts = $post_ids; |
| 3361 | $this->set_found_posts( $q, $limits ); |
| 3362 | _prime_post_caches( $post_ids, $q['update_post_term_cache'], $q['update_post_meta_cache'] ); |
| 3363 | } else { |
| 3364 | $this->posts = array(); |