1. Browsing management: the browsing menu is mainly based on the home page. When browsing, you can see customer login, food search, my order, food classification and the latest special food.

2. User registration management: The function of the user registration module is to accept user registration and write user information into the database after checking the legality of user registration data. Registered user registration flow chart (as shown in Figure 2-3):

Figure 2-3 registered user flow chart

3. Query the A la carte menu: The function of this module is to let customers find the food that suits them according to their own preferences and tastes. In our design, this module is mainly to query the food on the shelf. After inquiring about the dishes you are interested in, you can place an order, and after placing an order, you can cancel the order or continue to add the order.

4. User checkout: This module means that the customer places an order and prepares to checkout. There are three steps. The first step is to prevent customers from placing wrong orders and confirm the name and quantity of the dishes at one time. Step 2, fill in the customer's personal information, name, gender and delivery address. The third step is price statistics. If you don't place an order, you will be prompted: Sorry, you didn't place an order, please go to the "settlement center" after placing an order. You can also comment or explain this dish, and the restaurant will also provide an invoice if the customer needs it.

5. Administrator login: The administrator can change all the information of the website. The administrator's functions of this ordering system mainly include: modifying the administrator's password, logging off the administrator's login, adding goods, modifying existing goods information, processing orders, customers' messages and complaints, managing all registered users, deleting registered users, classifying existing goods, data processing, database operation and other functions. The administrator login module is basically similar to the user login module. It checks the administrator's account password through the database, and returns an error message if the administrator's account does not match the password.

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