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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 |
|---|---|
| 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) |
| 1034 | $post_ids[] = (int) $comment->comment_post_ID; |
| Line | Code |
| 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 ); |
| 1075 | $this->found_posts = apply_filters( 'found_posts', $this->found_posts ); |