Deprecated: The behavior of unparenthesized expressions containing both '.' and '+'/'-' will change in PHP 8: '+'/'-' will take a higher precedence in /virtual/cartmaker/public_html/manual-ja.saasproject.net/wp-content/plugins/booking-package/index.php on line 3079 予約カレンダーの作成 – Booking Packageの使い方