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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 |
|---|---|
| 2645 | |
| 2646 | $r = array(); |
| 2647 | foreach ( $this->posts as $post ) |
| 2648 | $r[ $post->ID ] = $post->post_parent; |
| 2649 | |
| 2650 | return $r; |
| 2651 | } |
| 2652 | |
| 2653 | $split_the_query = ( $old_request == $this->request && "$wpdb->posts.*" == $fields && !empty( $limits ) && $q['posts_per_page'] < 500 ); |
| 2654 | $split_the_query = apply_filters( 'split_the_query', $split_the_query, $this ); |
| 2655 | |
| 2656 | if ( $split_the_query ) { |
| 2657 | // First get the IDs and then fill in the objects |
| 2658 | |
| 2659 | $this->request = "SELECT $found_rows $distinct $wpdb->posts.ID FROM $wpdb->posts $join WHERE 1=1 $where $groupby $orderby $limits"; |
| 2660 | |
| 2661 | $this->request = apply_filters( 'posts_request_ids', $this->request, $this ); |
| 2662 | |
| 2663 | $ids = $wpdb->get_col( $this->request ); |