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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 |
|---|---|
| 3255 | |
| 3256 | /** |
| 3257 | * Filter the ORDER BY clause of the comments feed query before sending. |
| 3258 | * |
| 3259 | * @since 2.8.0 |
| 3260 | * |
| 3261 | * @param string $corderby The ORDER BY clause of the query. |
| 3262 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3263 | */ |
| 3264 | $corderby = apply_filters_ref_array( 'comment_feed_orderby', array( 'comment_date_gmt DESC', &$this ) ); |
| 3265 | |
| 3266 | /** |
| 3267 | * Filter the LIMIT clause of the comments feed query before sending. |
| 3268 | * |
| 3269 | * @since 2.8.0 |
| 3270 | * |
| 3271 | * @param string $climits The JOIN clause of the query. |
| 3272 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3273 | */ |
| Line | Code |
| 3636 | |
| 3637 | /** This filter is documented in wp-includes/query.php */ |
| 3638 | $cwhere = apply_filters_ref_array( 'comment_feed_where', array( "WHERE comment_post_ID = '{$this->posts[0]->ID}' AND comment_approved = '1'", &$this ) ); |
| 3639 | |
| 3640 | /** This filter is documented in wp-includes/query.php */ |
| 3641 | $cgroupby = apply_filters_ref_array( 'comment_feed_groupby', array( '', &$this ) ); |
| 3642 | $cgroupby = ( ! empty( $cgroupby ) ) ? 'GROUP BY ' . $cgroupby : ''; |
| 3643 | |
| 3644 | /** This filter is documented in wp-includes/query.php */ |
| 3645 | $corderby = apply_filters_ref_array( 'comment_feed_orderby', array( 'comment_date_gmt DESC', &$this ) ); |
| 3646 | $corderby = ( ! empty( $corderby ) ) ? 'ORDER BY ' . $corderby : ''; |
| 3647 | |
| 3648 | /** This filter is documented in wp-includes/query.php */ |
| 3649 | $climits = apply_filters_ref_array( 'comment_feed_limits', array( 'LIMIT ' . get_option('posts_per_rss'), &$this ) ); |
| 3650 | |
| 3651 | $comments_request = "SELECT $wpdb->comments.* FROM $wpdb->comments $cjoin $cwhere $cgroupby $corderby $climits"; |
| 3652 | $comments = $wpdb->get_results($comments_request); |
| 3653 | // Convert to WP_Comment |
| 3654 | $this->comments = array_map( 'get_comment', $comments ); |