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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 |
---|---|
2744 | /** |
2745 | * Filters a post's comment count before it is updated in the database. |
2746 | * |
2747 | * @since 4.5.0 |
2748 | * |
2749 | * @param int|null $new The new comment count. Default null. |
2750 | * @param int $old The old comment count. |
2751 | * @param int $post_id Post ID. |
2752 | */ |
2753 | $new = apply_filters( 'pre_wp_update_comment_count_now', null, $old, $post_id ); |
2754 |
|
2755 | if ( is_null( $new ) ) { |
2756 | $new = (int) $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM $wpdb->comments WHERE comment_post_ID = %d AND comment_approved = '1'", $post_id ) ); |
2757 | } else { |
2758 | $new = (int) $new; |
2759 | } |
2760 |
|
2761 | $wpdb->update( $wpdb->posts, array( 'comment_count' => $new ), array( 'ID' => $post_id ) ); |
2762 |
|