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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 |
---|---|
3005 |
|
3006 | /** |
3007 | * Filters the Post IDs SQL request before sending. |
3008 | * |
3009 | * @since 3.4.0 |
3010 | * |
3011 | * @param string $request The post ID request. |
3012 | * @param WP_Query $this The WP_Query instance. |
3013 | */ |
3014 | $this->request = apply_filters( 'posts_request_ids', $this->request, $this ); |
3015 |
|
3016 | $ids = $wpdb->get_col( $this->request ); |
3017 |
|
3018 | if ( $ids ) { |
3019 | $this->posts = $ids; |
3020 | $this->set_found_posts( $q, $limits ); |
3021 | _prime_post_caches( $ids, $q['update_post_term_cache'], $q['update_post_meta_cache'] ); |
3022 | } else { |
3023 | $this->posts = array(); |