How to develop a simple coupon and discount calculation function using PHP

Use PHP to develop simple coupon and discount calculation functions

With the rapid development of e-commerce, coupon and discount calculation functions have become an important part of attracting users and increasing sales. important means of quantity. In this article, we will introduce how to develop a simple coupon and discount calculation function using PHP to help you better understand this process.

First, we need to create a PHP file named discountCalculator.php. In this file, we will write a DiscountCalculator class that will include related methods and properties for coupon and discount calculations.

<?php
class DiscountCalculator {
  private $discountCodes = [
    "CODE10" => 0.1,
    "CODE20" => 0.2,
    "CODE50" => 0.5
  ];

  public function getDiscountedPrice($price, $discountCode) {
    if (array_key_exists($discountCode, $this->discountCodes)) {
      $discount = $this->discountCodes[$discountCode];
      $discountedPrice = $price - ($price * $discount);
      return $discountedPrice;
    } else {
      // 当输入的优惠码不存在时，返回原价
      return $price;
    }
  }
}
?>

In the above code, we created a DiscountCalculator class and defined a private property $discountCodes to store different coupon codes and their corresponding discount values. We also define a public method getDiscountedPrice, which accepts the product price and the discount code entered by the user as parameters, and returns the price after applying the discount.

Next, we can call the DiscountCalculator class in another PHP file and do some testing.

<?php
require_once 'discountCalculator.php';

$calculator = new DiscountCalculator();

$price = 100;  // 商品价格
$discountCode = "CODE20";  // 用户输入的优惠码

$discountedPrice = $calculator->getDiscountedPrice($price, $discountCode);

echo "优惠券代码：$discountCode
";
echo "原价：$price 元
";
echo "折扣后的价格：$discountedPrice 元
";
?>

In the above code, we first introduce the discountCalculator.php file defined previously. Then create an instance of DiscountCalculator $calculator, and set the product price and the discount code entered by the user. Finally, we call the getDiscountedPrice method and print the result.

Now, we can run this PHP file in the browser and see the output.

优惠券代码：CODE20
原价：100 元
折扣后的价格：80 元

With this simple example, we demonstrate how to use PHP to develop a coupon and discount calculation function. You can customize coupon codes and discount values ​​according to actual needs, and make more complex logical judgments.

I hope this article can help you better understand the development process of coupons and discount calculations in PHP and can be applied in your projects. I wish you success!

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