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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 |
|---|---|
| 2461 | /** |
| 2462 | * Filters a post's comment count before it is updated in the database. |
| 2463 | * |
| 2464 | * @since 4.5.0 |
| 2465 | * |
| 2466 | * @param int $new The new comment count. Default null. |
| 2467 | * @param int $old The old comment count. |
| 2468 | * @param int $post_id Post ID. |
| 2469 | */ |
| 2470 | $new = apply_filters( 'pre_wp_update_comment_count_now', null, $old, $post_id ); |
| 2471 | |
| 2472 | if ( is_null( $new ) ) { |
| 2473 | $new = (int) $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM $wpdb->comments WHERE comment_post_ID = %d AND comment_approved = '1'", $post_id ) ); |
| 2474 | } else { |
| 2475 | $new = (int) $new; |
| 2476 | } |
| 2477 | |
| 2478 | $wpdb->update( $wpdb->posts, array( 'comment_count' => $new ), array( 'ID' => $post_id ) ); |
| 2479 | |