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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 |
|---|---|
| 2708 | |
| 2709 | /** |
| 2710 | * Filters the LIMIT clause of the comments feed query before sending. |
| 2711 | * |
| 2712 | * @since 2.8.0 |
| 2713 | * |
| 2714 | * @param string $climits The JOIN clause of the query. |
| 2715 | * @param WP_Query $query The WP_Query instance (passed by reference). |
| 2716 | */ |
| 2717 | $climits = apply_filters_ref_array( 'comment_feed_limits', array( 'LIMIT ' . get_option( 'posts_per_rss' ), &$this ) ); |
| 2718 | } |
| 2719 | |
| 2720 | $cgroupby = ( ! empty( $cgroupby ) ) ? 'GROUP BY ' . $cgroupby : ''; |
| 2721 | $corderby = ( ! empty( $corderby ) ) ? 'ORDER BY ' . $corderby : ''; |
| 2722 | $climits = ( ! empty( $climits ) ) ? $climits : ''; |
| 2723 | |
| 2724 | $comments_request = "SELECT $distinct {$wpdb->comments}.comment_ID FROM {$wpdb->comments} $cjoin $cwhere $cgroupby $corderby $climits"; |
| 2725 | |
| 2726 | $key = md5( $comments_request ); |
| Line | Code |
| 3169 | /** This filter is documented in wp-includes/query.php */ |
| 3170 | $cgroupby = apply_filters_ref_array( 'comment_feed_groupby', array( '', &$this ) ); |
| 3171 | $cgroupby = ( ! empty( $cgroupby ) ) ? 'GROUP BY ' . $cgroupby : ''; |
| 3172 | |
| 3173 | /** This filter is documented in wp-includes/query.php */ |
| 3174 | $corderby = apply_filters_ref_array( 'comment_feed_orderby', array( 'comment_date_gmt DESC', &$this ) ); |
| 3175 | $corderby = ( ! empty( $corderby ) ) ? 'ORDER BY ' . $corderby : ''; |
| 3176 | |
| 3177 | /** This filter is documented in wp-includes/query.php */ |
| 3178 | $climits = apply_filters_ref_array( 'comment_feed_limits', array( 'LIMIT ' . get_option( 'posts_per_rss' ), &$this ) ); |
| 3179 | |
| 3180 | $comments_request = "SELECT {$wpdb->comments}.comment_ID FROM {$wpdb->comments} $cjoin $cwhere $cgroupby $corderby $climits"; |
| 3181 | |
| 3182 | $key = md5( $comments_request ); |
| 3183 | $last_changed = wp_cache_get_last_changed( 'comment' ); |
| 3184 | |
| 3185 | $cache_key = "comment_feed:$key:$last_changed"; |
| 3186 | $comment_ids = wp_cache_get( $cache_key, 'comment' ); |
| 3187 | if ( false === $comment_ids ) { |