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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 |
---|---|
2779 |
|
2780 | /** |
2781 | * Filters the ORDER BY clause of the comments feed query before sending. |
2782 | * |
2783 | * @since 2.8.0 |
2784 | * |
2785 | * @param string $corderby The ORDER BY clause of the query. |
2786 | * @param WP_Query $query The WP_Query instance (passed by reference). |
2787 | */ |
2788 | $corderby = apply_filters_ref_array( 'comment_feed_orderby', array( 'comment_date_gmt DESC', &$this ) ); |
2789 |
|
2790 | /** |
2791 | * Filters the LIMIT clause of the comments feed query before sending. |
2792 | * |
2793 | * @since 2.8.0 |
2794 | * |
2795 | * @param string $climits The JOIN clause of the query. |
2796 | * @param WP_Query $query The WP_Query instance (passed by reference). |
2797 | */ |
Line | Code |
3349 |
|
3350 | /** This filter is documented in wp-includes/query.php */ |
3351 | $cwhere = apply_filters_ref_array( 'comment_feed_where', array( "WHERE comment_post_ID = '{$this->posts[0]->ID}' AND comment_approved = '1'", &$this ) ); |
3352 |
|
3353 | /** This filter is documented in wp-includes/query.php */ |
3354 | $cgroupby = apply_filters_ref_array( 'comment_feed_groupby', array( '', &$this ) ); |
3355 | $cgroupby = ( ! empty( $cgroupby ) ) ? 'GROUP BY ' . $cgroupby : ''; |
3356 |
|
3357 | /** This filter is documented in wp-includes/query.php */ |
3358 | $corderby = apply_filters_ref_array( 'comment_feed_orderby', array( 'comment_date_gmt DESC', &$this ) ); |
3359 | $corderby = ( ! empty( $corderby ) ) ? 'ORDER BY ' . $corderby : ''; |
3360 |
|
3361 | /** This filter is documented in wp-includes/query.php */ |
3362 | $climits = apply_filters_ref_array( 'comment_feed_limits', array( 'LIMIT ' . get_option( 'posts_per_rss' ), &$this ) ); |
3363 |
|
3364 | $comments_request = "SELECT {$wpdb->comments}.comment_ID FROM {$wpdb->comments} $cjoin $cwhere $cgroupby $corderby $climits"; |
3365 |
|
3366 | $comment_key = md5( $comments_request ); |
3367 | $comment_last_changed = wp_cache_get_last_changed( 'comment' ); |