我知道如何以编程方式删除X天以前的注释，但它们随后会被丢弃。如何每隔X天清空评论垃圾？

function md_scheduled_delete_commentsmd_scheduled_delete_comments() {
    $comments = get_comments( array(
        \'post_type\' => \'post\',
        \'date_query\' => array(
            \'before\' => \'3 days ago\',
        ),
    ) );

    if ( $comments ) {
        foreach ( $comments as $comment ) {
            wp_delete_comment( $comment );
        }
    }
}
add_action( \'wp_scheduled_delete\', \'md_scheduled_delete_comments\' );
// You can test it immediately by adding following line:
// add_action( \'wp_loaded\', \'md_scheduled_delete_comments\' );