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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.
| Line | Code |
|---|---|
| 1215 | $cgroupby = "GROUP BY $wpdb->comments.comment_id"; |
| 1216 | } else { // Other non singular e.g. front |
| 1217 | $cjoin = "LEFT JOIN $wpdb->posts ON ( $wpdb->comments.comment_post_ID = $wpdb->posts.ID )"; |
| 1218 | $cwhere = "WHERE post_status = 'publish' AND comment_approved = '1'"; |
| 1219 | $cgroupby = ''; |
| 1220 | } |
| 1221 | |
| 1222 | $cjoin = apply_filters('comment_feed_join', $cjoin); |
| 1223 | $cwhere = apply_filters('comment_feed_where', $cwhere); |
| 1224 | $cgroupby = apply_filters('comment_feed_groupby', $cgroupby); |
| 1225 | |
| 1226 | $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')); |
| 1227 | $this->comment_count = count($this->comments); |
| 1228 | |
| 1229 | $post_ids = array(); |
| 1230 | |
| 1231 | foreach ($this->comments as $comment) |
| 1232 | $post_ids[] = (int) $comment->comment_post_ID; |
| 1233 | |