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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 |
|---|---|
| 2923 | |
| 2924 | $split_the_query = ( $old_request == $this->request && "$wpdb->posts.*" == $fields && !empty( $limits ) && $q['posts_per_page'] < 500 ); |
| 2925 | $split_the_query = apply_filters( 'split_the_query', $split_the_query, $this ); |
| 2926 | |
| 2927 | if ( $split_the_query ) { |
| 2928 | // First get the IDs and then fill in the objects |
| 2929 | |
| 2930 | $this->request = "SELECT $found_rows $distinct $wpdb->posts.ID FROM $wpdb->posts $join WHERE 1=1 $where $groupby $orderby $limits"; |
| 2931 | |
| 2932 | $this->request = apply_filters( 'posts_request_ids', $this->request, $this ); |
| 2933 | |
| 2934 | $ids = $wpdb->get_col( $this->request ); |
| 2935 | |
| 2936 | if ( $ids ) { |
| 2937 | $this->posts = $ids; |
| 2938 | $this->set_found_posts( $q, $limits ); |
| 2939 | _prime_post_caches( $ids, $q['update_post_term_cache'], $q['update_post_meta_cache'] ); |
| 2940 | } else { |
| 2941 | $this->posts = array(); |