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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 |
|---|---|
| 624 | } |
| 625 | } |
| 626 | } |
| 627 | |
| 628 | // Apply post-paging filters on where and join. Only plugins that |
| 629 | // manipulate paging queries should use these hooks. |
| 630 | $where = apply_filters('posts_where_paged', $where); |
| 631 | $groupby = " $wpdb->posts.ID "; |
| 632 | $groupby = apply_filters('posts_groupby', $groupby); |
| 633 | $join = apply_filters('posts_join_paged', $join); |
| 634 | $orderby = "post_" . $q['orderby']; |
| 635 | $orderby = apply_filters('posts_orderby', $orderby); |
| 636 | $request = " SELECT $distinct * FROM $wpdb->posts $join WHERE 1=1" . $where . " GROUP BY " . $groupby . " ORDER BY " . $orderby . " $limits"; |
| 637 | $request = apply_filters('posts_request', $request); |
| 638 | |
| 639 | $this->posts = $wpdb->get_results($request); |
| 640 | |
| 641 | // Check post status to determine if post should be displayed. |
| 642 | if ($this->is_single) { |