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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.
This hook occurs 2 times in this file.
| Line | Code |
|---|---|
| 2608 | |
| 2609 | /** |
| 2610 | * Filters the ORDER BY clause of the comments feed query before sending. |
| 2611 | * |
| 2612 | * @since 2.8.0 |
| 2613 | * |
| 2614 | * @param string $corderby The ORDER BY clause of the query. |
| 2615 | * @param WP_Query $this The WP_Query instance (passed by reference). |
| 2616 | */ |
| 2617 | $corderby = apply_filters_ref_array( 'comment_feed_orderby', array( 'comment_date_gmt DESC', &$this ) ); |
| 2618 | |
| 2619 | /** |
| 2620 | * Filters the LIMIT clause of the comments feed query before sending. |
| 2621 | * |
| 2622 | * @since 2.8.0 |
| 2623 | * |
| 2624 | * @param string $climits The JOIN clause of the query. |
| 2625 | * @param WP_Query $this The WP_Query instance (passed by reference). |
| 2626 | */ |
| Line | Code |
| 3021 | |
| 3022 | /** This filter is documented in wp-includes/query.php */ |
| 3023 | $cwhere = apply_filters_ref_array( 'comment_feed_where', array( "WHERE comment_post_ID = '{$this->posts[0]->ID}' AND comment_approved = '1'", &$this ) ); |
| 3024 | |
| 3025 | /** This filter is documented in wp-includes/query.php */ |
| 3026 | $cgroupby = apply_filters_ref_array( 'comment_feed_groupby', array( '', &$this ) ); |
| 3027 | $cgroupby = ( ! empty( $cgroupby ) ) ? 'GROUP BY ' . $cgroupby : ''; |
| 3028 | |
| 3029 | /** This filter is documented in wp-includes/query.php */ |
| 3030 | $corderby = apply_filters_ref_array( 'comment_feed_orderby', array( 'comment_date_gmt DESC', &$this ) ); |
| 3031 | $corderby = ( ! empty( $corderby ) ) ? 'ORDER BY ' . $corderby : ''; |
| 3032 | |
| 3033 | /** This filter is documented in wp-includes/query.php */ |
| 3034 | $climits = apply_filters_ref_array( 'comment_feed_limits', array( 'LIMIT ' . get_option( 'posts_per_rss' ), &$this ) ); |
| 3035 | |
| 3036 | $comments_request = "SELECT {$wpdb->comments}.* FROM {$wpdb->comments} $cjoin $cwhere $cgroupby $corderby $climits"; |
| 3037 | $comments = $wpdb->get_results( $comments_request ); |
| 3038 | // Convert to WP_Comment |
| 3039 | $this->comments = array_map( 'get_comment', $comments ); |