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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 |
|---|---|
| 2662 | |
| 2663 | $r = array(); |
| 2664 | foreach ( $this->posts as $post ) |
| 2665 | $r[ $post->ID ] = $post->post_parent; |
| 2666 | |
| 2667 | return $r; |
| 2668 | } |
| 2669 | |
| 2670 | $split_the_query = ( $old_request == $this->request && "$wpdb->posts.*" == $fields && !empty( $limits ) && $q['posts_per_page'] < 500 ); |
| 2671 | $split_the_query = apply_filters( 'split_the_query', $split_the_query, $this ); |
| 2672 | |
| 2673 | if ( $split_the_query ) { |
| 2674 | // First get the IDs and then fill in the objects |
| 2675 | |
| 2676 | $this->request = "SELECT $found_rows $distinct $wpdb->posts.ID FROM $wpdb->posts $join WHERE 1=1 $where $groupby $orderby $limits"; |
| 2677 | |
| 2678 | $this->request = apply_filters( 'posts_request_ids', $this->request, $this ); |
| 2679 | |
| 2680 | $ids = $wpdb->get_col( $this->request ); |