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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 |
|---|---|
| 3272 | |
| 3273 | /** |
| 3274 | * Filters the ORDER BY clause of the comments feed query before sending. |
| 3275 | * |
| 3276 | * @since 2.8.0 |
| 3277 | * |
| 3278 | * @param string $corderby The ORDER BY clause of the query. |
| 3279 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3280 | */ |
| 3281 | $corderby = apply_filters_ref_array( 'comment_feed_orderby', array( 'comment_date_gmt DESC', &$this ) ); |
| 3282 | |
| 3283 | /** |
| 3284 | * Filters the LIMIT clause of the comments feed query before sending. |
| 3285 | * |
| 3286 | * @since 2.8.0 |
| 3287 | * |
| 3288 | * @param string $climits The JOIN clause of the query. |
| 3289 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3290 | */ |
| Line | Code |
| 3680 | |
| 3681 | /** This filter is documented in wp-includes/query.php */ |
| 3682 | $cwhere = apply_filters_ref_array( 'comment_feed_where', array( "WHERE comment_post_ID = '{$this->posts[0]->ID}' AND comment_approved = '1'", &$this ) ); |
| 3683 | |
| 3684 | /** This filter is documented in wp-includes/query.php */ |
| 3685 | $cgroupby = apply_filters_ref_array( 'comment_feed_groupby', array( '', &$this ) ); |
| 3686 | $cgroupby = ( ! empty( $cgroupby ) ) ? 'GROUP BY ' . $cgroupby : ''; |
| 3687 | |
| 3688 | /** This filter is documented in wp-includes/query.php */ |
| 3689 | $corderby = apply_filters_ref_array( 'comment_feed_orderby', array( 'comment_date_gmt DESC', &$this ) ); |
| 3690 | $corderby = ( ! empty( $corderby ) ) ? 'ORDER BY ' . $corderby : ''; |
| 3691 | |
| 3692 | /** This filter is documented in wp-includes/query.php */ |
| 3693 | $climits = apply_filters_ref_array( 'comment_feed_limits', array( 'LIMIT ' . get_option('posts_per_rss'), &$this ) ); |
| 3694 | |
| 3695 | $comments_request = "SELECT $wpdb->comments.* FROM $wpdb->comments $cjoin $cwhere $cgroupby $corderby $climits"; |
| 3696 | $comments = $wpdb->get_results($comments_request); |
| 3697 | // Convert to WP_Comment |
| 3698 | $this->comments = array_map( 'get_comment', $comments ); |