This project implements a simple restaurant order system. The main topics covered in this implementation are:
- Practice of PHP syntax
- Implementation of the four pillars of object-oriented programming: encapsulation, abstraction, inheritance, and polymorphism
The theme of the project is food, and it includes modeling classes such as FoodItems, Restaurant, and Person, which represents people like Customer and Employee.
FoodItem is an abstract class that encapsulates the basic information for each food item, such as name, description, and price. Concrete classes extending FoodItem represent specific food categories like burgers, pizzas, and pastas. Each FoodItem has an internal constant class variable (not an instance variable) representing its category, which can be accessed directly via class static methods (e.g., Pizza::getCategory()) or constant class variables (e.g., Pizza::CATEGORY) without creating an instance. Examples of FoodItem include HawaiianPizza, Fettuccine, and CheeseBurger.
The Person class represents a general person. It encapsulates common attributes for all people interacting within the model, such as name, age, and address. Specific classes extending Person, such as Customer and Employee, inherit these shared attributes and implement their own unique properties and behaviors.
The Restaurant class is a concrete class that encapsulates all restaurant operations. It holds a list of FoodItem objects representing the menu and a list of Employee objects representing the restaurant staff.
A cashier Employee generates a FoodOrder and delegates the order, which includes a list of FoodItems, to a chef Employee. Additionally, the cashier generates an Invoice which is the return value of the order() function. The Invoice object includes the final price and order time.