Strategy pattern is a common design pattern that allows you to choose the behavior of an algorithm at runtime. By using the Strategy pattern, you can separate the implementation of the algorithm from the main business logic, thereby improving the maintainability and flexibility of the code. In this article, we'll explore how to use the Strategy pattern in PHP and provide corresponding source code examples.
First, let's define a simple example scenario. Suppose we are developing an e-commerce website and we need to calculate the discounted price of goods. The choice of discount strategy depends on the type of item, for example, electronics may have a different discount strategy, while clothing may have another strategy. We will use the Strategy pattern to solve this problem.
First, we need to create an abstract strategy interface that defines the method for calculating the discount price:
interface DiscountStrategy
{
public function calculateDiscount($price);
}
Next, we can implement specific