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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 | 
|---|---|
| 3123 |  | 
| 3124 |                     /** | 
| 3125 |                      * Filter the WHERE clause of the comments feed query before sending. | 
| 3126 |                      * | 
| 3127 |                      * @since 2.2.0 | 
| 3128 |                      * | 
| 3129 |                      * @param string   $cwhere The WHERE clause of the query. | 
| 3130 |                      * @param WP_Query &$this  The WP_Query instance (passed by reference). | 
| 3131 |                      */ | 
| 3132 |                     $cwhere = apply_filters_ref_array( 'comment_feed_where', array( $cwhere, &$this ) ); | 
| 3133 |  | 
| 3134 |                     /** | 
| 3135 |                      * Filter the GROUP BY clause of the comments feed query before sending. | 
| 3136 |                      * | 
| 3137 |                      * @since 2.2.0 | 
| 3138 |                      * | 
| 3139 |                      * @param string   $cgroupby The GROUP BY clause of the query. | 
| 3140 |                      * @param WP_Query &$this    The WP_Query instance (passed by reference). | 
| 3141 |                      */ | 
| Line | Code | 
| 3515 |                 */ | 
| 3516 |                $this->posts = apply_filters_ref_array( 'posts_results', array( $this->posts, &$this ) ); | 
| 3517 |           } | 
| 3518 |  | 
| 3519 |           if ( !empty($this->posts) && $this->is_comment_feed && $this->is_singular ) { | 
| 3520 |                /** This filter is documented in wp-includes/query.php */ | 
| 3521 |                $cjoin = apply_filters_ref_array( 'comment_feed_join', array( '', &$this ) ); | 
| 3522 |  | 
| 3523 |                /** This filter is documented in wp-includes/query.php */ | 
| 3524 |                $cwhere = apply_filters_ref_array( 'comment_feed_where', array( "WHERE comment_post_ID = '{$this->posts[0]->ID}' AND comment_approved = '1'", &$this ) ); | 
| 3525 |  | 
| 3526 |                /** This filter is documented in wp-includes/query.php */ | 
| 3527 |                $cgroupby = apply_filters_ref_array( 'comment_feed_groupby', array( '', &$this ) ); | 
| 3528 |                $cgroupby = ( ! empty( $cgroupby ) ) ? 'GROUP BY ' . $cgroupby : ''; | 
| 3529 |  | 
| 3530 |                /** This filter is documented in wp-includes/query.php */ | 
| 3531 |                $corderby = apply_filters_ref_array( 'comment_feed_orderby', array( 'comment_date_gmt DESC', &$this ) ); | 
| 3532 |                $corderby = ( ! empty( $corderby ) ) ? 'ORDER BY ' . $corderby : ''; | 
| 3533 |  |