Analysis of the mall order evaluation mechanism developed using PHP

Analysis of the mall order evaluation mechanism developed using PHP

1. Introduction
On modern e-commerce platforms, user evaluation is a very important function. User evaluations of products can help other users make purchasing decisions, and are also an important basis for merchants to understand user satisfaction and improve product quality. This article will introduce how to use the PHP developer mall order evaluation mechanism to add user evaluation functions to the e-commerce platform.

2. Database design
Before starting development, we first need to design a database table to store order and evaluation-related data. A basic database design is as follows:

1. Order table (order):
   Field name type description
   order_id varchar(20) Order ID
   user_id int User ID
   product_id int product ID
   order_time datetime order time
2. Product table (product):
   Field name type description
   product_id int product ID
   product_name varchar(50) product name
   price decimal(8,2) Product price
3. User table (user):
   Field name type description
   user_id int User ID
   username varchar(20) User name
4. Evaluation table (comment):
   Field name type description
   comment_id int Evaluation ID
   order_id varchar(20) Order ID
   user_id int User ID
   comment text Evaluation content
   comment_time datetime evaluation time
   star int rating

3. Evaluation function implementation

1. Display orders to be evaluated
   We first need to display the user on the user center page List of orders to be evaluated. We can use PHP code to query the database, obtain the current user's order list to be evaluated, and display it on the page. The sample code is as follows:

// Get the list of orders to be evaluated
$sql = "SELECT * FROM order WHERE user_id = 1 AND order_id NOT IN (SELECT order_id FROM comment)";
$result = mysql_query($sql);
while ($row = mysql_fetch_assoc($result)) {

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}
?>

The above is the basic implementation mechanism for order evaluation using PHP Developer City. Of course, in actual development, issues such as security, performance optimization, and permission control also need to be considered. This article only provides a simple reference. Hope it helps you!

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