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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
2563                     $cwhere = "WHERE comment_approved = '1' $where";
2564                     $cgroupby = "$wpdb->comments.comment_id";
2565                } else { // Other non singular e.g. front
2566                     $cjoin = "JOIN $wpdb->posts ON ( $wpdb->comments.comment_post_ID = $wpdb->posts.ID )";
2567                     $cwhere = "WHERE post_status = 'publish' AND comment_approved = '1'";
2568                     $cgroupby = '';
2569                }
2570
2571                if ( !$q['suppress_filters'] ) {
2572                     $cjoin = apply_filters_ref_array('comment_feed_join', array( $cjoin, &$this ) );
2573                     $cwhere = apply_filters_ref_array('comment_feed_where', array( $cwhere, &$this ) );
2574                     $cgroupby = apply_filters_ref_array('comment_feed_groupby', array( $cgroupby, &$this ) );
2575                     $corderby = apply_filters_ref_array('comment_feed_orderby', array( 'comment_date_gmt DESC', &$this ) );
2576                     $climits = apply_filters_ref_array('comment_feed_limits', array( 'LIMIT ' . get_option('posts_per_rss'), &$this ) );
2577                }
2578                $cgroupby = ( ! empty( $cgroupby ) ) ? 'GROUP BY ' . $cgroupby : '';
2579                $corderby = ( ! empty( $corderby ) ) ? 'ORDER BY ' . $corderby : '';
2580
2581                $this->comments = (array) $wpdb->get_results("SELECT $distinct $wpdb->comments.* FROM $wpdb->comments $cjoin $cwhere $cgroupby $corderby $climits");
 
Line Code
2694           // Convert to WP_Post objects
2695           if ( $this->posts )
2696                $this->posts = array_map( 'get_post', $this->posts );
2697
2698           // Raw results filter. Prior to status checks.
2699           if ( !$q['suppress_filters'] )
2700                $this->posts = apply_filters_ref_array('posts_results', array( $this->posts, &$this ) );
2701
2702           if ( !empty($this->posts) && $this->is_comment_feed && $this->is_singular ) {
2703                $cjoin = apply_filters_ref_array('comment_feed_join', array( '', &$this ) );
2704                $cwhere = apply_filters_ref_array('comment_feed_where', array( "WHERE comment_post_ID = '{$this->posts[0]->ID}' AND comment_approved = '1'", &$this ) );
2705                $cgroupby = apply_filters_ref_array('comment_feed_groupby', array( '', &$this ) );
2706                $cgroupby = ( ! empty( $cgroupby ) ) ? 'GROUP BY ' . $cgroupby : '';
2707                $corderby = apply_filters_ref_array('comment_feed_orderby', array( 'comment_date_gmt DESC', &$this ) );
2708                $corderby = ( ! empty( $corderby ) ) ? 'ORDER BY ' . $corderby : '';
2709                $climits = apply_filters_ref_array('comment_feed_limits', array( 'LIMIT ' . get_option('posts_per_rss'), &$this ) );
2710                $comments_request = "SELECT $wpdb->comments.* FROM $wpdb->comments $cjoin $cwhere $cgroupby $corderby $climits";
2711                $this->comments = $wpdb->get_results($comments_request);
2712                $this->comment_count = count($this->comments);