How to use PHP to implement the price protection function of the mall

With the continuous development of the e-commerce market, merchants often provide some preferential activities on their mall websites in order to attract more customers and increase sales. Common offers include discounts, gifts, and price reductions. Among them, price protection is a common preferential means, and its main function is to ensure that the price of goods purchased by buyers will not drop within a period of time. In this article, we will introduce how to use PHP to implement the price protection function of the mall.

1. Design database table

Create a table named "price_protection" in the MySQL database, which contains the following fields:

• id INT(11): Primary key, self-increasing
• product_id INT(11): Product ID
• old_price FLOAT(10,2): Last price
• new_price FLOAT(10 ,2): New price
• start_time DATETIME: Price protection start time
• end_time DATETIME: Price protection end time

2. Implement price protection function

In the product details page of the mall website, add a "Price Protection" button. Whenever the user clicks the button, a PHP script will be triggered that will retrieve price information from the database based on the item ID the user purchased.

If the timestamp stored in the "end_time" field has expired, return the old price, otherwise return the new price. If the old price is empty, it is set to the current price. If the price has dropped, update the old price and set the new price to the old price. If the price has not dropped, only the price protection period is updated.

The following is the PHP script sample code to implement this function:

<?php
$mysqli = new mysqli('localhost', 'username', 'password', 'your_database');
$productId = $_GET['product_id'];
$currentTime = date('Y-m-d H:i:s');
$sql = "SELECT * FROM price_protection WHERE product_id='$productId' AND end_time>'$currentTime'";
$result = $mysqli -> query($sql);

if ($result -> num_rows == 0) { //如果没有价格保护记录，则返回商品原有价格
    $sql = "SELECT price FROM products WHERE id='$productId'";
    $result = $mysqli -> query($sql);
    $row = $result -> fetch_assoc();
    echo $row['price'];
} else { //如果存在价格保护记录，则返回价格保护的价格
    $row = $result -> fetch_assoc();
    if ($row['old_price'] == null) {
        $row['old_price'] = $row['new_price'];
        $sql = "UPDATE price_protection SET old_price=".$row['old_price']." WHERE id=".$row['id'];
        $mysqli -> query($sql);
    }

    echo $row['old_price'];
    if ($row['new_price'] < $row['old_price']) {
        $sql = "UPDATE price_protection SET old_price=".$row['new_price'].", new_price=".$row['new_price']." WHERE id=".$row['id'];
        $mysqli -> query($sql);
    } else {
        $sql = "UPDATE price_protection SET start_time='$currentTime', end_time=DATE_ADD('$currentTime', INTERVAL 7 DAY) WHERE id=".$row['id'];
        $mysqli -> query($sql);
    }
}
?>

3. Front-end implementation

In the JavaScript code of the product details page, protect the price A button is added to the page and when clicked it requests the current price from the server. This price should be displayed to the right of the price on the product page and marked with a price protection icon.

The following is the JavaScript sample code to implement the price protection function:

$(document).ready(function() {
    $.ajax({
        url: 'get_price.php',
        dataType: 'json',
        success: function(data) {
            if (data.success) {
               $('#price').html('<span class="old-price">¥ '+data.data.old_price+'</span>¥ '+data.data.new_price+'<i class="icon-price-protection"></i>');
            } else {
               $('#price').html('<span>¥ '+data.data.price+'</span><i class="icon-price-protection"></i>');
            }
        }
    });
});

4. Summary

This article introduces how to use PHP to implement price protection in the mall Function. Specific implementation methods are given from the aspects of database design, script implementation, front-end implementation, etc. I hope this article can be helpful to developers, implement the discount function of the mall, and provide buyers with a better shopping experience.

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