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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 |
|---|---|
| 1440 | if ( ! empty($groupby) ) |
| 1441 | $groupby = 'GROUP BY ' . $groupby; |
| 1442 | if ( !empty( $orderby ) ) |
| 1443 | $orderby = 'ORDER BY ' . $orderby; |
| 1444 | $found_rows = ''; |
| 1445 | if ( !empty($limits) ) |
| 1446 | $found_rows = 'SQL_CALC_FOUND_ROWS'; |
| 1447 | |
| 1448 | $request = " SELECT $found_rows $distinct $fields FROM $wpdb->posts $join WHERE 1=1 $where $groupby $orderby $limits"; |
| 1449 | $this->request = apply_filters('posts_request', $request); |
| 1450 | |
| 1451 | $this->posts = $wpdb->get_results($this->request); |
| 1452 | // Raw results filter. Prior to status checks. |
| 1453 | $this->posts = apply_filters('posts_results', $this->posts); |
| 1454 | |
| 1455 | if ( !empty($this->posts) && $this->is_comment_feed && $this->is_singular ) { |
| 1456 | $cjoin = apply_filters('comment_feed_join', ''); |
| 1457 | $cwhere = apply_filters('comment_feed_where', "WHERE comment_post_ID = '{$this->posts[0]->ID}' AND comment_approved = '1'"); |
| 1458 | $comments_request = "SELECT $wpdb->comments.* FROM $wpdb->comments $cjoin $cwhere ORDER BY comment_date_gmt DESC LIMIT " . get_option('posts_per_rss'); |