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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 |
|---|---|
| 2740 | |
| 2741 | /** |
| 2742 | * Filters the ORDER BY clause of the comments feed query before sending. |
| 2743 | * |
| 2744 | * @since 2.8.0 |
| 2745 | * |
| 2746 | * @param string $corderby The ORDER BY clause of the query. |
| 2747 | * @param WP_Query $query The WP_Query instance (passed by reference). |
| 2748 | */ |
| 2749 | $corderby = apply_filters_ref_array( 'comment_feed_orderby', array( 'comment_date_gmt DESC', &$this ) ); |
| 2750 | |
| 2751 | /** |
| 2752 | * Filters the LIMIT clause of the comments feed query before sending. |
| 2753 | * |
| 2754 | * @since 2.8.0 |
| 2755 | * |
| 2756 | * @param string $climits The JOIN clause of the query. |
| 2757 | * @param WP_Query $query The WP_Query instance (passed by reference). |
| 2758 | */ |
| Line | Code |
| 3295 | |
| 3296 | /** This filter is documented in wp-includes/query.php */ |
| 3297 | $cwhere = apply_filters_ref_array( 'comment_feed_where', array( "WHERE comment_post_ID = '{$this->posts[0]->ID}' AND comment_approved = '1'", &$this ) ); |
| 3298 | |
| 3299 | /** This filter is documented in wp-includes/query.php */ |
| 3300 | $cgroupby = apply_filters_ref_array( 'comment_feed_groupby', array( '', &$this ) ); |
| 3301 | $cgroupby = ( ! empty( $cgroupby ) ) ? 'GROUP BY ' . $cgroupby : ''; |
| 3302 | |
| 3303 | /** This filter is documented in wp-includes/query.php */ |
| 3304 | $corderby = apply_filters_ref_array( 'comment_feed_orderby', array( 'comment_date_gmt DESC', &$this ) ); |
| 3305 | $corderby = ( ! empty( $corderby ) ) ? 'ORDER BY ' . $corderby : ''; |
| 3306 | |
| 3307 | /** This filter is documented in wp-includes/query.php */ |
| 3308 | $climits = apply_filters_ref_array( 'comment_feed_limits', array( 'LIMIT ' . get_option( 'posts_per_rss' ), &$this ) ); |
| 3309 | |
| 3310 | $comments_request = "SELECT {$wpdb->comments}.comment_ID FROM {$wpdb->comments} $cjoin $cwhere $cgroupby $corderby $climits"; |
| 3311 | |
| 3312 | $comment_key = md5( $comments_request ); |
| 3313 | $comment_last_changed = wp_cache_get_last_changed( 'comment' ); |