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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 |
|---|---|
| 1367 | $cgroupby = "GROUP BY $wpdb->comments.comment_id"; |
| 1368 | } else { // Other non singular e.g. front |
| 1369 | $cjoin = "LEFT JOIN $wpdb->posts ON ( $wpdb->comments.comment_post_ID = $wpdb->posts.ID )"; |
| 1370 | $cwhere = "WHERE post_status = 'publish' AND comment_approved = '1'"; |
| 1371 | $cgroupby = ''; |
| 1372 | } |
| 1373 | |
| 1374 | $cjoin = apply_filters('comment_feed_join', $cjoin); |
| 1375 | $cwhere = apply_filters('comment_feed_where', $cwhere); |
| 1376 | $cgroupby = apply_filters('comment_feed_groupby', $cgroupby); |
| 1377 | |
| 1378 | $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')); |
| 1379 | $this->comment_count = count($this->comments); |
| 1380 | |
| 1381 | $post_ids = array(); |
| 1382 | |
| 1383 | foreach ($this->comments as $comment) |
| 1384 | $post_ids[] = (int) $comment->comment_post_ID; |
| 1385 | |