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Source View: comment_feed_join

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Understanding Source Code

The best way to understand what a hook does is to look at where it occurs in the source code.

  • Action hooks look like this: do_action( "hook_name" )
  • Filter hooks look like this: 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.

Source View

This hook occurs 2 times in this file.

Line Code
1015                     $cjoin = "LEFT JOIN $wpdb->posts ON ($wpdb->comments.comment_post_ID = $wpdb->posts.ID) $join ";
1016                     $cwhere = "WHERE comment_approved = '1' $where";
1017                     $cgroupby = "GROUP BY $wpdb->comments.comment_id";
1018                } else { // Other non singular e.g. front
1019                     $cjoin = "LEFT JOIN $wpdb->posts ON ( $wpdb->comments.comment_post_ID = $wpdb->posts.ID )";
1020                     $cwhere = "WHERE post_status = 'publish' AND comment_approved = '1'";
1021                     $cgroupby = '';
1022                }
1023
1024                $cjoin = apply_filters('comment_feed_join', $cjoin);
1025                $cwhere = apply_filters('comment_feed_where', $cwhere);
1026                $cgroupby = apply_filters('comment_feed_groupby', $cgroupby);
1027
1028                $this->comments = (array) $wpdb->get_results("SELECT $distinct $wpdb->comments.* FROM $wpdb->comments $cjoin $cwhere $cgroupby ORDER BY comment_date_gmt DESC LIMIT " . get_option('posts_per_rss'));
1029                $this->comment_count = count($this->comments);
1030
1031                $post_ids = array();
1032
1033                foreach ($this->comments as $comment)
 
Line Code
1056           if ( !empty($limits) )
1057                $found_rows = 'SQL_CALC_FOUND_ROWS';
1058
1059           $request = " SELECT $found_rows $distinct $fields FROM $wpdb->posts $join WHERE 1=1 $where $groupby ORDER BY $orderby $limits";
1060           $this->request = apply_filters('posts_request', $request);
1061
1062           $this->posts = $wpdb->get_results($this->request);
1063
1064           if ( $this->is_comment_feed && $this->is_singular ) {
1065                $cjoin = apply_filters('comment_feed_join', '');
1066                $cwhere = apply_filters('comment_feed_where', "WHERE comment_post_ID = {$this->posts[0]->ID} AND comment_approved = '1'");
1067                $comments_request = "SELECT $wpdb->comments.* FROM $wpdb->comments $cjoin $cwhere ORDER BY comment_date_gmt DESC LIMIT " . get_option('posts_per_rss');
1068                $this->comments = $wpdb->get_results($comments_request);
1069                $this->comment_count = count($this->comments);
1070           }
1071
1072           if ( !empty($limits) ) {
1073                $found_posts_query = apply_filters( 'found_posts_query', 'SELECT FOUND_ROWS()' );
1074                $this->found_posts = $wpdb->get_var( $found_posts_query );