How to use PHP to develop the delivery cost calculation function of the grocery shopping system?

With the improvement of living standards and people’s higher and higher requirements for food quality, the application of food shopping APPs is becoming more and more common, and the calculation of delivery costs is one of the important function. This article will introduce how to use PHP to develop the delivery cost calculation function of the grocery shopping system.

1. Define delivery cost calculation rules

Before developing the delivery cost calculation function of the grocery shopping system, we need to first define the delivery cost calculation rules. Under normal circumstances, the calculation rules for delivery costs are mainly related to the following factors:

1) Delivery distance: The farther the distance, the higher the delivery cost.

2) Delivery period: For example, delivery fees are higher during peak periods or at night.

3) Product weight and volume: The greater the product weight and volume, the higher the delivery fee.

4) Payment method: The delivery fee for paying with cash may be slightly higher than the delivery fee for paying with Alipay or WeChat.

Based on the above factors, we can define a basic delivery cost calculation rule, as follows:

distance

5km

10km

15km

The delivery period is 9:00-18:00 on working days: add 20%

Product weight and volume: 10% per kilogram or cubic meter

Payment method is cash: an additional 2 yuan will be charged

2. to achieve delivery Cost calculation function

With the delivery cost calculation rules as a basis, we can start to implement the delivery cost calculation function. The following is a piece of PHP code that implements the calculation of delivery fees based on the above rules:

function calculate_delivery_cost($distance, $weight, $volume, $payment_method, $delivery_time){

    $cost = 0;

    if($distance <= 5){
        $cost = 5;
    } else if($distance <= 10){
        $cost = 8;
    } else if($distance <= 15){
        $cost = 12;
    } else {
        $cost = 15;
    }

    if($delivery_time >= strtotime("9:00:00") && $delivery_time <= strtotime("18:00:00")){
        $cost *= 1.2;
    }

    $cost += ($weight / 1000) * 0.1;
    $cost += ($volume / 1) * 0.1;

    if($payment_method == 'cash'){
        $cost += 2;
    }

    return $cost;
}

This code receives five parameters, namely delivery distance, product weight, product volume, payment method and delivery time. Finally, the calculated delivery cost is returned.

We can verify the correctness of this function by testing some different parameter combinations, such as:

calculate_delivery_cost(8, 5000, 2, 'alipay', strtotime('10:00:00'));

// 输出：10.08

This code indicates that the delivery distance is 8 kilometers, the product weight is 5 kilograms, and the product volume It is 2 cubic meters. It is paid with Alipay and delivered at 10 a.m. on working days. The final calculated delivery fee is 10.08 yuan.

3. Conclusion

Through the above steps, we have implemented a PHP-based grocery shopping system delivery cost calculation function. Of course, this is just a simple example. In actual development, we need to consider more factors, such as regional differences, seasonal changes, etc., to formulate more reasonable calculation rules and improve user experience.

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