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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 |
---|---|
3290 |
|
3291 | /** |
3292 | * Filters the Post IDs SQL request before sending. |
3293 | * |
3294 | * @since 3.4.0 |
3295 | * |
3296 | * @param string $request The post ID request. |
3297 | * @param WP_Query $query The WP_Query instance. |
3298 | */ |
3299 | $this->request = apply_filters( 'posts_request_ids', $this->request, $this ); |
3300 |
|
3301 | $post_ids = $wpdb->get_col( $this->request ); |
3302 |
|
3303 | if ( $post_ids ) { |
3304 | $this->posts = $post_ids; |
3305 | $this->set_found_posts( $q, $limits ); |
3306 | _prime_post_caches( $post_ids, $q['update_post_term_cache'], $q['update_post_meta_cache'] ); |
3307 | } else { |
3308 | $this->posts = array(); |