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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 |
|---|---|
| 2799 | |
| 2800 | /** |
| 2801 | * Filters the LIMIT clause of the comments feed query before sending. |
| 2802 | * |
| 2803 | * @since 2.8.0 |
| 2804 | * |
| 2805 | * @param string $climits The JOIN clause of the query. |
| 2806 | * @param WP_Query $query The WP_Query instance (passed by reference). |
| 2807 | */ |
| 2808 | $climits = apply_filters_ref_array( 'comment_feed_limits', array( 'LIMIT ' . get_option( 'posts_per_rss' ), &$this ) ); |
| 2809 | } |
| 2810 | |
| 2811 | $cgroupby = ( ! empty( $cgroupby ) ) ? 'GROUP BY ' . $cgroupby : ''; |
| 2812 | $corderby = ( ! empty( $corderby ) ) ? 'ORDER BY ' . $corderby : ''; |
| 2813 | $climits = ( ! empty( $climits ) ) ? $climits : ''; |
| 2814 | |
| 2815 | $comments_request = "SELECT $distinct {$wpdb->comments}.comment_ID FROM {$wpdb->comments} $cjoin $cwhere $cgroupby $corderby $climits"; |
| 2816 | |
| 2817 | $key = md5( $comments_request ); |
| Line | Code |
| 3383 | /** This filter is documented in wp-includes/query.php */ |
| 3384 | $cgroupby = apply_filters_ref_array( 'comment_feed_groupby', array( '', &$this ) ); |
| 3385 | $cgroupby = ( ! empty( $cgroupby ) ) ? 'GROUP BY ' . $cgroupby : ''; |
| 3386 | |
| 3387 | /** This filter is documented in wp-includes/query.php */ |
| 3388 | $corderby = apply_filters_ref_array( 'comment_feed_orderby', array( 'comment_date_gmt DESC', &$this ) ); |
| 3389 | $corderby = ( ! empty( $corderby ) ) ? 'ORDER BY ' . $corderby : ''; |
| 3390 | |
| 3391 | /** This filter is documented in wp-includes/query.php */ |
| 3392 | $climits = apply_filters_ref_array( 'comment_feed_limits', array( 'LIMIT ' . get_option( 'posts_per_rss' ), &$this ) ); |
| 3393 | |
| 3394 | $comments_request = "SELECT {$wpdb->comments}.comment_ID FROM {$wpdb->comments} $cjoin $cwhere $cgroupby $corderby $climits"; |
| 3395 | |
| 3396 | $comment_key = md5( $comments_request ); |
| 3397 | $comment_last_changed = wp_cache_get_last_changed( 'comment' ); |
| 3398 | |
| 3399 | $comment_cache_key = "comment_feed:$comment_key:$comment_last_changed"; |
| 3400 | $comment_ids = wp_cache_get( $comment_cache_key, 'comment-queries' ); |
| 3401 | if ( false === $comment_ids ) { |