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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 |
|---|---|
| 2635 | |
| 2636 | /** |
| 2637 | * Filters the ORDER BY clause of the comments feed query before sending. |
| 2638 | * |
| 2639 | * @since 2.8.0 |
| 2640 | * |
| 2641 | * @param string $corderby The ORDER BY clause of the query. |
| 2642 | * @param WP_Query $this The WP_Query instance (passed by reference). |
| 2643 | */ |
| 2644 | $corderby = apply_filters_ref_array( 'comment_feed_orderby', array( 'comment_date_gmt DESC', &$this ) ); |
| 2645 | |
| 2646 | /** |
| 2647 | * Filters the LIMIT clause of the comments feed query before sending. |
| 2648 | * |
| 2649 | * @since 2.8.0 |
| 2650 | * |
| 2651 | * @param string $climits The JOIN clause of the query. |
| 2652 | * @param WP_Query $this The WP_Query instance (passed by reference). |
| 2653 | */ |
| Line | Code |
| 3051 | |
| 3052 | /** This filter is documented in wp-includes/query.php */ |
| 3053 | $cwhere = apply_filters_ref_array( 'comment_feed_where', array( "WHERE comment_post_ID = '{$this->posts[0]->ID}' AND comment_approved = '1'", &$this ) ); |
| 3054 | |
| 3055 | /** This filter is documented in wp-includes/query.php */ |
| 3056 | $cgroupby = apply_filters_ref_array( 'comment_feed_groupby', array( '', &$this ) ); |
| 3057 | $cgroupby = ( ! empty( $cgroupby ) ) ? 'GROUP BY ' . $cgroupby : ''; |
| 3058 | |
| 3059 | /** This filter is documented in wp-includes/query.php */ |
| 3060 | $corderby = apply_filters_ref_array( 'comment_feed_orderby', array( 'comment_date_gmt DESC', &$this ) ); |
| 3061 | $corderby = ( ! empty( $corderby ) ) ? 'ORDER BY ' . $corderby : ''; |
| 3062 | |
| 3063 | /** This filter is documented in wp-includes/query.php */ |
| 3064 | $climits = apply_filters_ref_array( 'comment_feed_limits', array( 'LIMIT ' . get_option( 'posts_per_rss' ), &$this ) ); |
| 3065 | |
| 3066 | $comments_request = "SELECT {$wpdb->comments}.* FROM {$wpdb->comments} $cjoin $cwhere $cgroupby $corderby $climits"; |
| 3067 | $comments = $wpdb->get_results( $comments_request ); |
| 3068 | // Convert to WP_Comment. |
| 3069 | $this->comments = array_map( 'get_comment', $comments ); |